Droplet Generation Container and Method for Manufacturing Particles

Abstract

The present disclosure relates to a droplet generating vessel and a method for manufacturing particles using the same. More specifically, it relates to a droplet generating vessel configured to stably and efficiently transport droplets formed by ultrasonic vibration energy to the outside of the vessel. Furthermore, the present disclosure relates to a method for manufacturing particles using the said droplet generating vessel.

Description

Technology Field

[0001] The present disclosure relates to the manufacture and transport of droplets, and more specifically, to a droplet generating container for effectively transporting droplets generated by ultrasonic vibration and a method for manufacturing particles using the same. Background Technology

[0002] Spray pyrolysis is a technology that synthesizes nanomaterials, ceramics, and fine particles of metals by spraying a raw material solution containing a desired metal salt, dissolved or dispersed, into fine droplets using an ultrasonic droplet generator, and causing drying and pyrolysis reactions at high temperatures. An important element in this process is not only the generation of droplets in which various types of metals are stoichiometrically and uniformly distributed, but also the process of effectively transporting the generated droplets to a high-temperature environment.

[0003] If the flow control of the carrier gas is incomplete during droplet transfer, the droplets are not discharged smoothly from the container, and some droplets remain inside. These residual droplets may re-liquefy or cause unexpected hydrodynamic problems, which can reduce process efficiency. Furthermore, this issue can increase production costs and reduce the price competitiveness of the product.

[0004] Therefore, for efficient droplet transport, it is necessary to go beyond mere droplet generation technology and design a structure capable of effectively transporting them without loss. Such a structure must prevent droplet deformation and loss while maintaining uniformity along the transport path. Ultimately, the development of a process structure that ensures the economic viability of particle synthesis by improving droplet transport efficiency is essential. The problem to be solved

[0005] The present disclosure aims to provide a droplet generating container having a structure capable of effectively transporting droplets and a carrier gas.

[0006] In addition, the present disclosure aims to provide a droplet generating container designed to prevent deformation and damage to droplets and to maintain stability and consistency during the transfer process.

[0007] Furthermore, the present disclosure aims to provide a droplet generating container capable of reducing quality issues and process costs that may arise in various industrial applications by improving the efficiency and quality of the particle manufacturing process. means of solving the problem

[0008] According to one aspect of the present disclosure, a droplet generating container may be provided, comprising: at least one carrier gas inlet formed on the upper part of a first side of the container for injecting a carrier gas; an outlet formed on the upper part of a second side of the container for discharging a droplet that is conveyed together with the carrier gas; a raw material solution injector formed on one side of the container for injecting a raw material solution containing a metal salt; at least one vibration transmission part formed to generate the droplet by transmitting ultrasonic vibrations generated from a droplet generating device equipped with an ultrasonic vibrator to the raw material solution located inside the container; and a guide part formed in a plate shape extending obliquely from the upper surface of the container toward the lower direction of the carrier gas inlet, and formed to guide the flow direction of the carrier gas.

[0009] According to an exemplary aspect of the present disclosure, the height of the first side of the container and the height of the second side of the container may be the same.

[0010] According to an exemplary aspect of the present disclosure, the height of the first side of the container may be formed lower than the height of the second side of the container, so that the upper surface of the container may be configured to be inclined from the first side of the container toward the second side of the container.

[0011] According to an exemplary aspect of the present disclosure, the carrier gas inlet is formed at the lower end of the inclined upper surface of the container, and the outlet is formed at the upper end of the inclined upper surface of the container, and the guide portion is positioned on the inclined surface between the carrier gas inlet and the outlet, thereby creating a flow path for the carrier gas so that the carrier gas injected into the container flows along one surface of the guide portion toward the lower part of the container and then flows toward the outlet.

[0012] According to an exemplary aspect of the present disclosure, the upper surface of the container may form an angle of inclination of 5 to 30˚ with respect to a horizontal plane.

[0013] According to an exemplary aspect of the present disclosure, the ratio of the height of the first side of the container to the height of the second side of the container may be 1:1 to 1:5.

[0014] According to an exemplary aspect of the present disclosure, the guide portion may be formed as a structure in which the upper surface of the container is recessed inwardly and formed as a concave shape, extending obliquely from the upper surface of the container toward the lower direction of the conveying gas inlet, and may be configured to guide the conveying gas introduced through the conveying gas inlet to flow toward the lower direction of the container after colliding with one surface of the guide portion.

[0015] According to an exemplary aspect of the present disclosure, the guide portion may be a structure formed as a separate member fixed to the inner side of the upper surface of the container by a fastening, attachment, or coupling method, formed in a plate shape extending obliquely from the upper surface of the container toward the lower direction of the conveying gas inlet, and may be configured to induce the conveying gas introduced through the conveying gas inlet to flow toward the lower direction of the container after colliding with one surface of the guide portion.

[0016] According to an exemplary aspect of the present disclosure, the guide portion is formed to be inclined downward toward the transfer gas inlet with respect to the upper surface of the container, and the guide portion may have an inclination angle of 10 to 60˚ with respect to the horizontal plane.

[0017] According to an exemplary aspect of the present disclosure, the gap between the inclined end of the guide portion and the side wall of the container on the side of the transfer gas inlet may be 30 mm or less.

[0018] According to an exemplary aspect of the present disclosure, the container further comprises a tube inserted into the container through the outlet, the tube being formed in a tubular shape having a predetermined length, the cross-section of the tube being configured to be identical to the cross-section of the outlet, and the lower end of the tube being spaced apart from the bottom surface of the container so that the conveyed gas can be discharged to the outside of the container through the tube.

[0019] According to an exemplary aspect of the present disclosure, the distance between the lower end of the tube and the bottom surface of the container may be 5 to 100 mm.

[0020] According to an exemplary aspect of the present disclosure, the carrier gas flows along the longitudinal direction of the container and passes through the lower part of the container to form a streamline, and the tube may be inserted into the container such that the streamline forms an angle of inclination of 1 to 30° with respect to the horizontal plane.

[0021] According to another aspect of the present disclosure, as a method for manufacturing particles,

[0022] The method comprises the steps of: providing a raw material solution containing a metal salt to a droplet generating vessel; transmitting vibrations generated from an ultrasonic vibrator of a droplet generating device connected to the droplet generating vessel to the raw material solution through a vibration transmission unit to generate droplets inside the vessel; injecting a carrier gas into the droplet generating vessel to transfer the generated droplets to the outside of the vessel; and forming particles by thermally decomposing the droplets transferred to the outside of the vessel by the carrier gas at a high temperature.

[0023] A method for manufacturing particles may be provided, comprising: at least one carrier gas inlet formed on the upper part of the first side of the container to inject the carrier gas; an outlet formed on the upper part of the second side of the container to discharge a droplet that is conveyed together with the carrier gas; a raw material solution inlet formed on one side of the container to inject the raw material solution containing a metal salt; at least one vibration transmission part formed to generate the droplet by transmitting ultrasonic vibrations generated from the droplet generating device equipped with an ultrasonic vibrator to the raw material solution located inside the container; and a guide part formed in a plate shape extending obliquely from the upper surface of the container toward the lower direction of the carrier gas inlet to guide the flow direction of the carrier gas.

[0024] According to an exemplary aspect of the present disclosure, the raw material solution may comprise a metal salt, and the metal salt is dissolved in a solvent so as to be dispersed into droplets by ultrasonic vibration in a solution state, and the solvent may be at least one selected from the group consisting of an aqueous solvent, an organic solvent, an inorganic solvent, or a mixture thereof.

[0025] According to an exemplary aspect of the present disclosure, the raw material solution may have a viscosity of 0.5 to 20 mPa·s and a surface tension of 10 to 70 mN / m.

[0026] According to an exemplary aspect of the present disclosure, the average diameter of the droplets generated from the raw material solution through the ultrasonic vibration may be 1 to 100 μm.

[0027] According to an exemplary aspect of the present disclosure, the vibration transmission unit is disposed in contact with the droplet generating device and the bottom or side surface of the droplet generating container, is formed at a position corresponding to the vibrator of the droplet generating device, and is configured to directly transmit vibrations generated from the droplet generating device to the raw material solution, and the ultrasonic vibrations can be generated at a frequency of 10 to 100 kHz and an output of 10 to 50 W.

[0028] According to an exemplary aspect of the present disclosure, the raw material solution and the carrier gas may be injected at a flow rate of 1 to 20 mL / min.

[0029] According to another aspect of the present disclosure, a method for manufacturing particles using a droplet generating vessel,

[0030] The droplet generating container comprises: at least one carrier gas inlet formed on the upper part of the first side of the container for injecting a carrier gas; an outlet formed on the upper part of the second side of the container for discharging a droplet conveyed together with the carrier gas; a raw material solution injector formed on one side of the container for injecting a raw material solution containing a metal salt; at least one vibration transmission part formed in the same number as the vibrator at a position corresponding to the vibrator to transmit ultrasonic vibrations generated from a droplet generating device equipped with an ultrasonic vibrator to the raw material solution located inside the container to generate the droplet; and a guide part formed in a plate shape extending obliquely from the upper surface of the container toward the lower direction of the carrier gas inlet, formed to guide the flow direction of the carrier gas.

[0031] A method for manufacturing particles may be provided, comprising: a step of injecting a raw material solution containing a metal salt from a raw material solution storage unit containing the raw material solution through a raw material solution injector using a pump; a step of transmitting vibration energy into the interior of the container through a vibration transmission unit to generate and spray fine droplets from the raw material solution; a step of injecting a carrier gas through a carrier gas inlet to cause the carrier gas to flow along one surface of a guide unit to the bottom of the container; a step of inserting a tube into the interior of the container through an outlet such that a streamline of the carrier gas flowing through the bottom of the container along the longitudinal direction of the container forms an inclination angle of 1 to 30˚ with respect to the bottom surface of the container; and a step of discharging the carrier gas and droplets through the tube to a heating unit of a furnace located outside the container. Effects of the invention

[0032] According to embodiments of the present disclosure, the transfer efficiency of droplets can be improved by controlling the flow direction of the transfer gas inside the droplet generating container.

[0033] According to the embodiments of the present disclosure, the processing speed and productivity of the particle manufacturing process can be increased through the improvement of droplet transfer efficiency, and the costs incurred in the process can be reduced.

[0034] According to the embodiments of the present disclosure, deformation and damage to droplets generated inside a droplet generating container can be prevented, and the stability and reproducibility of the particle generation process can be improved.

[0035] In addition, the particle manufacturing method according to the embodiments of the present disclosure is applicable to various particle synthesis processes and can provide high utility in advanced industrial fields such as the production of high-performance materials or the manufacturing of high-precision nanoparticles. Brief explanation of the drawing

[0036] FIG. 1 is a perspective view illustrating a droplet generating container (100) according to a first aspect of the present disclosure. FIG. 2 is a side view illustrating a droplet generating container (100), a droplet generating device (500), a raw material solution storage unit (400), a pump (P), and a valve (V) according to the first aspect of the present disclosure. FIG. 3 is a perspective view illustrating a droplet generating container (200) according to a second aspect of the present disclosure. FIG. 4 is a drawing illustrating a droplet generating container (300) according to a third aspect of the present disclosure. Figure 5 is a diagram illustrating the flow of a transport gas in a droplet generating container without a guide section. FIG. 6 is a drawing illustrating the flow of a transport gas in a droplet generating container (100) according to the first aspect of the present disclosure. FIG. 7 is a drawing illustrating a droplet generating container having a guide portion inclined toward the discharge port based on the upper surface of the container. FIG. 8 is a side view illustrating the gap (W) between the bottom of the guide portion (150) and the side wall of the container on the transport gas inlet side, the gap (L) between the bottom of the guide portion (150) and the raw material solution (S), and the distance (H) between the bottom of the tube (160) and the bottom surface of the container in a droplet generating container (100) according to the first aspect of the present disclosure. Figure 9 is a diagram comparing the streamline shape of the transported gas with and without a guide section. Figure 10 is a diagram comparing the streamline shapes of pilot-scale droplet generating vessels of different heights. Specific details for implementing the invention

[0037] The following description should be understood as describing the present disclosure with specific examples, and the technical concept of the present disclosure is not limited to the description below. Furthermore, the attached drawings are provided to aid in understanding the present disclosure, and the technical concept of the present disclosure is not limited to the attached drawings. Additionally, the thickness or size of each component in the drawings may be exaggerated, omitted, or schematically depicted for convenience of explanation.

[0038] In the description of the structure disclosed herein, positional relationships or directions are based on the drawings attached to this specification unless specifically stated otherwise.

[0039] In the description of the structure disclosed herein, descriptions of space or positional relationships refer to the relative positions between the components constituting the disclosure. Furthermore, unless specifically stated otherwise, another component may exist in the space between one component and another component. For example, when the specification refers to another component being located "above" or "on top" of one component, it includes not only the case where another component is located immediately above one component, but also the case where another component is located between one component and other components.

[0040] In this specification, singular expressions may be interpreted to include the plural unless specifically stated otherwise. In this specification, the expression "comprising" means that the configurations, parts, operations, features, numbers, etc. described in the description are present, and does not exclude the addition of one or more other configurations, parts, operations, features, numbers, etc.

[0041] The present disclosure can be fully achieved by the following description. The following description should be understood as describing preferred embodiments of the present disclosure, but the present disclosure is not necessarily limited thereto. Furthermore, the attached drawings are for illustrative purposes only and do not limit the present disclosure; details regarding individual configurations may be appropriately understood in accordance with the specific intent of the related descriptions set forth below. The present disclosure will be described in detail below with reference to the attached drawings.

[0042] In the present disclosure, a droplet generating container may refer to a container in which a raw material solution for droplet generation is injected into the interior, and droplets are generated due to ultrasonic vibrations transmitted to the raw material solution.

[0043] FIG. 1 is a perspective view illustrating a droplet generating container (100) according to a first aspect of the present disclosure, and FIG. 2 is a side view illustrating a droplet generating container (100), a droplet generating device (500), a raw material solution storage unit (400), a pump (P), and a valve (V) according to a first aspect of the present disclosure.

[0044] According to one embodiment of the present disclosure, a droplet generating container (100) may be provided, comprising: at least one carrier gas inlet (110) formed on the upper side of a first container to inject a carrier gas; an outlet (120) formed on the upper side of a second container to discharge a droplet that is conveyed together with the carrier gas; a raw material solution inlet (130) formed on one side of the container to inject a raw material solution (S) containing a metal salt; at least one vibration transmission part (140) formed to generate the droplet by transmitting a vibration generated from a droplet generating device (500) equipped with an ultrasonic vibrator to the raw material solution (S) located inside the container; and a guide part (150) formed in a plate shape extending obliquely from the upper surface of the container toward the lower direction of the carrier gas inlet (110) to guide the flow direction of the carrier gas.

[0045] A spray pyrolysis system that generates droplets from a raw material solution and generates particles from the generated droplets may include a droplet generating vessel according to one embodiment of the present disclosure.

[0046] According to one embodiment of the present disclosure, a raw material solution can be transferred from a raw material solution storage unit to a droplet generating container via a pump (P), and the amount of solution transferred can be controlled by a valve (V). The raw material solution storage unit is not limited to a specific shape, form, material, etc., and may be configured with a shape, form, or material optimized for storing the raw material solution (S).

[0047] The raw material solution (S) may be a solution containing a metal salt. The type of metal salt is not particularly limited and may be, for example, at least one selected from transition metals, alkali metals, alkaline earth metals, rare earth metals, or combinations thereof. The metal salt may be, for example, a compound containing a metal ion, such as a nitrate, acetate, chloride, sulfate, carbonate, hydroxide, hydride, sulfide, nitride, halide, chloride compound, organometallic compound, or a combination thereof, but is not limited thereto. More specifically, the metal salt may be a metal salt containing metal ions such as iron (Fe), nickel (Ni), cobalt (Co), copper (Cu), manganese (Mn), zinc (Zn), chromium (Cr), titanium (Ti), aluminum (Al), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), cerium (Ce), lanthanum (La), yttrium (Y), gadolinium (Gd), molybdenum (Mo), and tungsten (W), and specific examples of the metal salt include Fe(NO3)3, Ni(NO3)2, Co(NO3)2, Cu(CH3COO)2, MnCl2, Zn(NO3)2, TiOSO4, Al(NO3)3, Ca(NO3)2, Sr(NO3)2, Ba(NO3)2, Ce(NO3)3, La(NO3)3, Y(NO3)3, and MoO3. (NH4)6Mo7O 24 , (NH4) 10 [H2W 12 O 42It may include ] etc. The metal salt may be a single component or a complex metal salt in which two or more metal salts are mixed, but can be appropriately selected according to the desired final powder composition and structure, and any precursor or precursor capable of generating particles can be applied without limitation. Meanwhile, the raw material solution (S) refers to a solution formed by dissolving a metal salt in at least one solvent, and the solvent is not limited to any substance capable of stably dissolving the metal salt. The solvent may be an aqueous solvent, an organic solvent, an inorganic solvent, or a mixture thereof. The solvent may be, for example, water, deionized water, alcohols (e.g., methanol, ethanol, isopropanol), glycols (e.g., ethylene glycol, diethylene glycol), ketones (e.g., acetone, methyl ethyl ketone), esters, amines, polar organic solvents (e.g., dimethylformamide (DMF), dimethyl sulfoxide (DMSO)), or a mixture thereof, but is not limited thereto, and it is desirable to select an appropriate solvent by considering the solubility, reactivity, process temperature, and decomposition characteristics of the metal salt.

[0048] Meanwhile, the concentration, viscosity, and surface tension of the raw material solution (S) can be appropriately controlled according to process conditions and the characteristics of the droplets produced. Since the concentration of the metal salt contained in the raw material solution affects the content of metal components in the droplets and the particle formation density, it is desirable to control it appropriately for particle shape and size control. The metal salt concentration of the raw material solution may be, for example, 0.01 to 2 mol / L, 0.05 to 2 mol / L, 0.1 to 2 mol / L, 0.5 to 2 mol / L, 1.0 to 2 mol / L, 1.2 to 2 mol / L, 1.4 to 2 mol / L, 1.6 to 2 mol / L, 0.01 to 1.5 mol / L, 0.05 to 1.5 mol / L, 0.1 to 1.5 mol / L, 0.5 to 1.5 mol / L, 1 to 1.5 mol / L, 0.01 to 1 mol / L, 0.05 to 1 mol / L, 0.1 to 1 mol / L, or 0.5 to 1 mol / L, but is not limited thereto. The viscosity of the raw material solution at 20 to 30 ℃ may be, for example, 0.5 to 20 mPa·s, 1 to 20 mPa·s, 5 to 20 mPa·s, 10 to 20 mPa·s, 0.5 to 10 mPa·s, 1 to 10 mPa·s, or 5 to 10 mPa·s, but is not limited thereto.The surface tension of the raw material solution at 20 to 30 °C may be, for example, 10 to 70 mN / m, 20 to 70 mN / m, 30 to 70 mN / m, 40 to 70 mN / m, 50 to 70 mN / m, 60 to 70 mN / m, 10 to 60 mN / m, 20 to 60 mN / m, 30 to 60 mN / m, 40 to 60 mN / m, 50 to 60 mN / m, 10 to 50 mN / m, 20 to 50 mN / m, 30 to 50 mN / m, 40 to 50 mN / m, 10 to 40 mN / m, 20 to 40 mN / m, 30 to 40 mN / m, or The range may be from 10 to 30 mN / m, but is not limited thereto. The ranges of concentration, viscosity, and surface tension may be appropriately changed depending on the device configuration, spraying conditions, and desired particle characteristics, and are not limited to the above description.

[0049] The outer wall material of the droplet transfer container (100) according to one embodiment of the present disclosure may be, for example, acrylic, quartz, Pyrex, stainless steel (SUS), glass, polycarbonate, polytetrafluoroethylene (PTFE), polypropylene (PP), polyethylene (PE), aluminum, ceramic, or a combination thereof, but is not limited thereto, and it is preferable to use a material that does not react with the raw material solution to be synthesized and has excellent chemical resistance, heat resistance, and processability.

[0050] A droplet generating container (100) is configured to inject a raw material solution (S) containing a metal salt and may include a raw material solution inlet (130) formed on one side of the outer wall of the container. The specific location where the raw material solution inlet (130) is formed in the droplet generating container (100) is not particularly limited and, for example, may be formed on the same side where the discharge port (120) is located. It is preferable for the raw material solution inlet (130) to be formed at a position higher than the surface of the raw material solution (S) to ensure smooth injection and prevent leakage, taking into account the liquid level of the raw material solution (S) injected into the container (100), but it is not limited thereto and can be adjusted according to design and operating conditions.

[0051] The raw material solution (S) can be injected into the container (100) through the raw material solution injection port (130) via a conveying means such as a silicone tube or a fixed tube made of stainless steel. The injection method of the raw material solution (S) can be a continuous injection method or an intermittent injection method. In the case of a continuous injection method, continuous generation of droplets is possible by continuously injecting the raw material solution (S) at a constant flow rate, and in the case of an intermittent injection method, the amount of raw material consumed can be controlled or flexibility in process control can be secured by injecting a corresponding amount once or multiple times in response to the amount of droplets discharged outside the container (100).

[0052] The raw material solution can be injected into the container at a liquid level of 0.5 to 4 cm from the bottom surface of the droplet generating container. The liquid level range of the raw material solution may be, for example, 0.5 to 3 cm, 0.5 to 3.5 cm, 0.5 to 2.5 cm, 0.5 to 2 cm, 0.5 to 1.5 cm, 0.5 to 1 cm, 1 to 4 cm, 1 to 3.5 cm, 1 to 3 cm, 1 to 2.5 cm, 1 to 2 cm, 1 to 1.5 cm, 1.5 to 4 cm, 1.5 to 3.5 cm, 1.5 to 3 cm, 1.5 to 2.5 cm, 1.5 to 2 cm, 2 to 3.5 cm, 2 to 3 cm, 2 to 2.5 cm, 2.5 to 4 cm, 2.5 to 3.5 cm, 2.5 to 3 cm, 3 to 4 cm, 3.5 to 4 cm, or 2 to 4 cm. Meanwhile, the amount of raw material solution injected into the droplet generating container is preferably equal to the amount of droplets generated from the raw material solution and discharged outside the container, but is not limited thereto.

[0053] Meanwhile, the droplet generating device (500) is configured to generate ultrasonic vibrations and may include at least one vibrator (510). The droplet generating device may be, for example, an atomizer, and more specifically, an ultrasonic atomizer, but is not necessarily limited thereto.

[0054] The ultrasonic vibration generated from the vibrator (510) of the droplet generating device (500) is transmitted to the raw material solution (S) located inside the container through the vibration transmission part (140) formed in the droplet generating container (100). At this time, the transmitted vibration energy acts on the raw material solution (S) to form fine droplets on the surface, and the generated droplets can move outward by spraying from the surface of the raw material solution (S).

[0055] The vibration transmission section (140) may refer to a configuration formed in the droplet generating container (100) to effectively transmit ultrasonic vibrations generated from the droplet generating device to the raw material solution. The vibration transmission section (140) may be formed on the surface of the droplet generating container (100) at a portion corresponding to the location where the vibrator (510) of the droplet generating device (500) is formed. The number of vibration transmission sections (140) formed in the droplet generating container (100) may be equal to the number of vibrators (510) formed in the droplet generating device (500).

[0056] The vibration transmission unit (140) is preferably composed of a material suitable for vibration characteristics so as to efficiently transmit ultrasonic vibration energy into the droplet generating container (100). The material of the vibration transmission unit (140) may be a thin film-type material, for example, a hydroxy-type film (OH film), a polyimide film (PI film), a polyethylene terephthalate film (PET film), etc., may be used, but is not limited thereto. The film used in the vibration transmission unit (140) may be selected as a material that not only has excellent vibration transmission characteristics but also heat resistance, chemical resistance, flexibility, and durability, and can operate stably even under repetitive vibration conditions.

[0057] Referring to FIG. 2, a cooling solvent (600) may be included between the droplet generating vessel (100) and the droplet generating device (500) as a medium for cooling and ultrasonic vibration. The cooling solvent (600) can efficiently transmit ultrasonic vibrations transmitted from the droplet generating device (500) to the droplet generating vessel (100) while simultaneously controlling the temperature of the system. As long as the cooling solvent (600) can perform the role of cooling and a medium, there are no special restrictions on its type or physical properties, and various media may be selectively used depending on the process conditions.

[0058] Additionally, at least one carrier gas inlet (110) may be formed on one side of the upper surface (first side of the container) of the droplet generating container (100). The carrier gas inlet (110) allows carrier gas to be injected into the droplet generating container (100) from the outside.

[0059] The carrier gas serves to transport the droplets generated inside the droplet generating container (100) to the outside through the outlet (120), and the type of gas that can be used is not particularly limited. The carrier gas may be, for example, an inert gas such as oxygen (O2), ozone (O3), nitrogen (N2), neon (Ne), helium (He), or argon (Ar), or a reducing gas such as hydrogen (H2) gas or forming gas, or (compressed) air, but is not limited thereto. The carrier gas may be used as a single type of gas or a mixture of two or more types of gases, or in a mixed form in which the main gas is controlled by a diluent gas, and may be used by controlling the flow characteristics and reactivity suitable for the purpose of the process.

[0060] A carrier gas inlet (110) may be formed at the lower end of the inclined upper surface of the droplet generating container (100). The number of carrier gas inlets (110) may be adjusted according to the size or structure of the droplet generating container (100). For example, in the case of a large-capacity container, as the amount of droplets generated inside increases, it is necessary to increase the flow rate or flow rate of the carrier gas. However, if the flow rate of the carrier gas is increased excessively, a strong vortex is formed inside the container, causing the movement path of the droplets to become unstable, which may result in problems such as the droplets being deformed or destroyed. Therefore, in order to stably transport droplets while maintaining a constant flow rate of the carrier gas even in a large-capacity container, two or more carrier gas inlets may be distributed and arranged. These multiple inlets can contribute to stabilizing the flow by uniformly distributing the carrier gas, preventing droplet damage, and improving overall transport efficiency.

[0061] An outlet (120) may be formed on the other side (second side of the container) of the upper surface of the droplet generating container (100). The outlet (120) is positioned at a location spaced apart from the carrier gas inlet (110) and can serve as a passage through which droplets generated inside the container (100) are discharged to the outside along the flow of the carrier gas.

[0062] Since the carrier gas injected into the droplet generating container (100) generally has a low density and tends to move upward, it is preferable that the discharge port (120) be formed on the upper surface of the container (100) to ensure smooth flow of the carrier gas and stable discharge of the droplets. The discharge port (120) may be directly connected to the heating section of a furnace, which is an external reaction device, or it may be indirectly connected through a tube (160) inserted into the droplet generating container (100) through the discharge port (120). Droplets discharged outside the container (100) along with the carrier gas through the tube (160) are transferred to the heating section of the furnace, where they undergo pyrolysis or heat treatment in a high-temperature environment to finally be converted into powder particles and collected. Through this, the process flow from the moment the droplets are formed until they are granulated can be maintained continuously and stably.

[0063] A droplet generating container (100) according to an exemplary embodiment of the present disclosure may be configured such that the height of the first side of the container, where the carrier gas inlet (110) is located, and the height of the second side of the container, where the outlet (120) is located, are the same, or the height of the first side of the container is lower than the height of the second side of the container, so that the upper surface of the container slopes from the first side of the container toward the second side of the container. This structure can naturally guide the flow of the carrier gas toward the outlet and contribute to increasing the stability of the droplet transport path.

[0064] FIG. 3 is a perspective view illustrating a droplet generating container (200) according to a second aspect of the present disclosure.

[0065] Referring to FIG. 3, a droplet generating container (200) according to one embodiment of the present disclosure may include a transport gas inlet (210), an outlet (220), a raw material solution injection port (230), a vibration transmission part (240), a guide part (250), and a tube (260), and as shown in the drawing, the height of the first side of the container where the transport gas inlet (210) is formed and the height of the second side of the container where the outlet (220) is formed may be configured to be the same.

[0066] Referring again to FIG. 1 and FIG. 2, a droplet generating container (100) according to one embodiment of the present disclosure may be configured such that the height of the first side of the container, where the transfer gas inlet (110) is formed, is lower than the height of the second side of the container, where the discharge port (120) is formed, so that the upper surface of the container is inclined from the first side of the container toward the second side of the container. When the upper surface of the container is configured to be inclined, the upper surface of the container may have an inclination angle of, for example, 5 to 30° with respect to the horizontal plane, or may have an inclination angle of 10 to 30°, 15 to 30°, 20 to 30°, 25 to 30°, 5 to 25°, 10 to 25°, 15 to 25°, 20 to 25°, 5 to 20°, 10 to 20°, 15 to 20°, 5 to 15°, or 5 to 10°, but is not limited thereto.

[0067] The height ratio of the first side and the second side of the container is, for example, 1:1 to 1:5, 1:1.1 to 1:5, 1:1.2 to 1:5, 1:1.25 to 1:5, 1:1.5 to 1:5, 1:2 to 1:5, 1:3 to 1:5, 1:1 to 1:4, 1:1.1 to 1:4, 1:1.2 to 1:4, 1:1.25 to 1:4, 1:1:4 to 1:4, 1:1.6 to 1:4, 1:2 to 1:4, 1:2.5 to 1:4, 1:3 to 1:4, 1:1 to 1:3, 1:1.1 to 1:3, 1:1.2 to 1:3, 1:1.25 to 1:3, It may be 1:1.4 to 1:3, 1:1.6 to 1:3, 1:2 to 1:3, 1:1 to 1:2, 1:1.1 to 1:2, 1:1.2 to 1:2, 1:1.25 to 1:2, 1:1.4 to 1:2, 1:1.6 to 1:2, 1:1 to 1:1.5, 1:1.1 to 1:1.5, 1:1.2 to 1:1.5, 1:1.25 to 1:1.5, 1:1 to 1:1.25, 1:1.1 to 1:1.25, or 1:1.2 to 1:1.25, but is not limited thereto. In the case of such an inclined structure, the side cross-section of the droplet generating container may be in the shape of a trapezoid, with the second side being higher than the first side relative to the bottom surface of the container, or it may be configured in a rectangular shape depending on the case. However, such a shape is merely an exemplary configuration intended to facilitate the natural flow of the carrier gas and to stably transport the droplets toward the outlet, and the shape is not necessarily limited to a specific shape as long as the carrier gas can effectively transport the droplets generated inside the container.

[0068] In a droplet generating container according to one embodiment of the present disclosure, the height of the first side of the container may be formed lower than the height of the second side of the container, so that the upper surface of the container is inclined from the first side toward the second side. In this case, a carrier gas inlet may be formed at the lower end (first side) of the inclined upper surface, and an outlet may be formed at the upper end (second side) of the inclined upper surface. This structure induces the carrier gas to naturally flow upward along the inclined surface, thereby enabling the generated droplets to be transported toward the outlet, and thus can contribute to facilitating the flow of droplets and improving transport efficiency.

[0069] FIG. 4 is a drawing illustrating a droplet generating container (300) according to a third aspect of the present disclosure. The droplet generating container (300) according to the third aspect refers to a pilot-scale droplet generating container.

[0070] Referring to FIG. 4, a pilot-scale droplet generating vessel (300) may include a transfer gas inlet (310), an outlet (320), a solution inlet (330), a vibration transmission section (340), a guide section (350), and a tube (360).

[0071] The size of a droplet generating vessel according to one embodiment of the present disclosure may be determined according to the number of vibrators of the droplet generating device. As described above, since the number of vibration transmission parts formed in the droplet generating vessel corresponds one-to-one with the number of vibrators of the droplet generating device, the number of vibration transmission parts increases as the number of vibrators increases, and accordingly, the overall size of the droplet generating vessel may also increase. For example, if the number of vibrators increases, more vibration transmission parts are required, so a larger surface area is required on the bottom or side of the vessel; as a result, the internal volume of the vessel increases, and the total amount of droplets generated inside naturally increases. In this case, it is desirable that the supply amount of the transport gas also increase proportionally to ensure that the droplets are smoothly transported to the outside.

[0072] Accordingly, at least two or more carrier gas inlets (310) may be formed in the pilot-scale droplet generating vessel (300) to supply sufficient carrier gas. These multiple carrier gas inlets disperse the gas flow and stabilize the internal gas flow, thereby allowing the generated droplets to be efficiently transported without being damaged or deflected. Through this, droplet transport stability and particle quality can be simultaneously ensured even in large-scale processes.

[0073] Meanwhile, the reaction residence time, which refers to the time it takes for a droplet discharged from a droplet generating container to react as it passes through the heating section of a furnace, can be defined as follows.

[0074] Reaction residence time(s) =

[0076] According to one embodiment of the present disclosure, the flow rate of the carrier gas can be calculated by back-calculating based on the reaction residence time. The reaction residence time is, for example, 1 to 5 seconds, 1 to 4 seconds, 1 to 3 seconds, 1 to 2.5 seconds, 1 to 2 seconds, 1.5 to 5 seconds, 1.5 to 4.5 seconds, 1.5 to 4 seconds, 1.5 to 3.5 seconds, 1.5 to 3 seconds, 1.5 to 2.5 seconds, 1.5 to 2 seconds, 2 to 5 seconds, 2 to 4.5 seconds, 2 to 4 seconds, 2 to 3.5 seconds, 2 to 3 seconds, 2 to 2.5 seconds, 2.1 to 2.7 seconds, 2.2 to 2.6 seconds, 2.3 to 2.5 seconds, 2.5 to 5 seconds, 2.5 to 4.5 seconds, 2.5 to 4 seconds, 2.5 to 3 seconds, 3 to 5 seconds, 3 to It may be 4.5 seconds, 3 to 4 seconds, 3 to 3.5 seconds, 3.5 to 5 seconds, 3.5 to 4.5 seconds, 3.5 to 4 seconds, 4 to 5 seconds, 4 to 4.5 seconds, or 4.5 to 5 seconds, but is not limited thereto.

[0077] Meanwhile, the droplets generated from the raw material solution (S) contain metal salts, etc., so they do not easily rise to the top and have the characteristic of mainly floating on the surface of the raw material solution (S). Accordingly, it is necessary to use a carrier gas to discharge the droplets formed inside the droplet generation container to the outside. By injecting the carrier gas into the container, the droplets can be transported to the outside of the container according to the flow of the carrier gas.

[0078] However, in a typical structure, the carrier gas is injected through the carrier gas inlet and collides with the bottom surface of the container, forming a V-shaped upward flow. This can lead to a problem where the carrier gas flow does not sufficiently affect the droplets floating on the surface of the raw material solution or below the outlet. As a result, the transport efficiency of the droplets is reduced, and some droplets may remain inside the container.

[0079] A droplet generating container (100) according to one embodiment of the present disclosure may include a guide portion (150) for stably inducing the flow of a carrier gas from the bottom of the container toward the outlet (120). The guide portion (150) is structured to be disposed between the carrier gas inlet (110) and the outlet (120) and may be formed in the form of a baffle plate or a shield that controls the flow direction of the carrier gas.

[0080] The guide section (150) can guide the transport gas to flow more gently along the bottom surface of the container, thereby aligning the gas flow and stabilizing the gas flow environment inside the container, and suppressing the generation of turbulence and vortices, thereby preventing or suppressing droplet damage or destruction.

[0081] The guide section (150) can be formed in the shape of a plate extending from the upper surface of the container into the container, and preferably, its width corresponds substantially to the entire width direction of the container so that the transport gas injected into the container can flow directly into the lower direction of the container along the guide section without bypassing both sides of the guide section.

[0082] More specifically, the guide portion (150) may be formed with a structure in which the upper surface of the container is concavely recessed inward, and the guide portion (150) may be formed in a plate shape extending obliquely from the upper surface of the container toward the lower direction of the carrier gas inlet (110), and may perform the function of guiding the carrier gas introduced through the carrier gas inlet (110) to flow smoothly toward the lower direction of the container after colliding with one surface of the guide portion (150). By having such a configuration, the overall carrier gas flow can be stabilized to improve droplet transfer efficiency.

[0083] As illustrated in FIGS. 1 and 2, a guide portion (150) according to an exemplary embodiment of the present disclosure is positioned on an inclined surface between the transfer gas inlet (110) and the outlet (120) and can serve to form a flow path for the transfer gas so that the transfer gas injected into the container flows along one side of the guide portion (150) toward the bottom of the container and then flows toward the outlet (120).

[0084] Additionally, the guide portion (150) may be a plate structure formed by being recessed to a certain depth from the upper surface of the droplet generating container (100) toward the inside of the container, and specifically, it may be formed as a plate shape extending obliquely from the upper surface of the container toward the lower direction of the transfer gas inlet, and may be formed as a structure that is recessed from the upper surface toward the inside of the container (e.g., a groove or an indentation).

[0085] Meanwhile, the guide section may not be formed integrally with the upper surface of the droplet generating container, but may be configured as a separate plate-shaped structure (not shown) independently positioned by being fastened, attached, or coupled inside the container. In this case as well, the guide section is formed in a shape that extends obliquely downward from the upper surface of the container toward the carrier gas inlet, and can perform the same function of guiding the carrier gas introduced through the carrier gas inlet to flow toward the lower side of the container after colliding with one surface or the oblique surface of the guide section. Such a guide section may be in the form of a baffle plate independently mounted inside the container, and while it is preferable for the material to be the same as that of the droplet generating container body, it may be selected considering corrosion resistance, heat resistance, or vibration transmission characteristics, and is not necessarily limited thereto.

[0086] The carrier gas injected through the carrier gas inlet (110) can first collide with one side or an inclined surface of the guide section (150) and then form a flow that is guided along the surface toward the bottom of the container. Through this structure, the carrier gas naturally flows downward along the guide section (150), and in this process, it can flow at a gentle angle to the bottom surface of the container while maintaining a streamline. Such a flow can be effective in suppressing the generation of turbulence or vortices and ensuring that the liquid droplet is stably transported toward the discharge port without damage.

[0087] The carrier gas may form a streamline as it flows along the longitudinal direction of the container and passes through the bottom of the container. The streamline may form an angle of inclination with respect to a horizontal plane, for example, of 1 to 30°, or may be 5 to 30°, 10 to 30°, 15 to 30°, 20 to 30°, 1 to 25°, 5 to 25°, 10 to 25°, 15 to 25°, 15 to 20°, 1 to 20°, 5 to 20°, 10 to 20°, 15 to 20°, 1 to 15°, 5 to 15°, 10 to 15°, 1 to 10°, or 5 to 10°, but is not limited thereto. It is preferable that the angle of inclination be an angle that allows the carrier gas to flow gently along the bottom surface of the container and be discharged to the outside of the container.

[0088] By maintaining a streamline and flowing at a gentle angle along the longitudinal direction of the container, the vortex caused by the gas flow can be effectively suppressed, and the carrier gas can flow stably along the surface of the raw material solution (S) and efficiently transport droplets floating on the surface toward the discharge port (120). Through this carrier gas flow control structure, the discharge volume of droplets generated inside the droplet generating container (100) can be increased, and as the amount of droplets transferred to the heating part of the furnace increases, the yield of manufactured particles can be improved. At the same time, the amount of droplets remaining inside the droplet generating container (100) is reduced, and the efficiency of the entire particle manufacturing process can also be increased.

[0089] More specifically, in a droplet generating container (100) according to one embodiment of the present disclosure, a carrier gas is injected through a carrier gas inlet (110) and then collides with one surface of a guide portion (150) and is guided to the bottom of the container along that surface. In this process, since the carrier gas does not directly collide with the bottom surface of the container, the strong vortex region that may occur as a result can be significantly reduced, and the carrier gas can flow toward the discharge port (120) at a gentle angle with respect to the bottom surface of the container. Accordingly, the carrier gas can stably move most of the droplets remaining on the surface of the raw material solution (S), thereby increasing the amount of droplets transferred outside the container and improving the transfer efficiency and particle productivity of the entire system.

[0090] Figure 5 is a diagram illustrating the flow of a transport gas in a droplet generating container without a guide section.

[0091] Referring to FIG. 5, as described above, the carrier gas can form a flow that collides with the bottom surface of the container immediately after injection, rises in a V-shape, and moves toward the outlet. During this process, the carrier gas colliding with the bottom surface of the container diffuses irregularly, forming a rotational flow and strong vortices, which can apply abnormal and irregular forces to the droplets, causing deformation or destruction of the droplets. Furthermore, due to the vortices, the carrier gas and the droplets are not mixed uniformly, and as the droplets move along irregular trajectories, the stability and efficiency of the transport may be reduced. Additionally, a dead zone of the carrier gas flow is formed at the bottom of the outlet, increasing the likelihood that the droplets will remain inside the container without riding on the flow of the carrier gas.

[0092] FIG. 6 is a drawing illustrating the flow of a transport gas in a droplet generating container (100) according to the first aspect of the present disclosure.

[0093] Referring to FIG. 6, the carrier gas injected into the carrier gas inlet (110) can flow along one side of the guide section (150). The carrier gas flows along one side of the guide section (150) to the bottom of the container without loss and can form a flow toward the outlet (120) at a gentle angle with the bottom surface of the container. Unlike the case of FIG. 5, which does not have a guide section, there is no sudden collision between the carrier gas and the bottom surface of the container, so a stable streamline can be formed, which reduces the generation of vortices and reduces the possibility of deformation or destruction of droplets. In addition, as the carrier gas flows at a gentle angle with the bottom surface of the container, the flow directionality is improved, allowing a larger amount of droplets floating on the surface of the raw material solution (S) to effectively move toward the outlet (120) along the flow of the carrier gas, thereby improving droplet transport efficiency and increasing particle production.

[0094] According to one exemplary embodiment of the present disclosure, the guide portion (150) may be provided in a shape inclined toward the transfer gas inlet (110) with respect to the upper surface of the droplet generating container (100).

[0095] Referring to FIG. 6, in the case of a droplet generating container (100) equipped with a guide section (150) inclined toward the carrier gas inlet (110), the carrier gas injected into the droplet generating container (100) collides with the guide section (150) and is guided to the bottom of the container along one side of the guide section (150), forming a streamline at a gentle angle with the bottom surface of the container and moving toward the outlet (120). As a result, the possibility of vortex generation is reduced, and the flow of the carrier gas is stabilized, thereby preventing the droplets from being deformed or destroyed. In addition, this flow of carrier gas effectively transports a large amount of droplets floating inside the container to the outside of the container, thereby reducing the amount of droplets remaining inside the container and improving transport efficiency and particle production.

[0096] FIG. 7 is a drawing illustrating a droplet generating container having a guide portion inclined toward the discharge port based on the upper surface of the container.

[0097] Referring to FIG. 7, when the guide section is tilted toward the outlet, the carrier gas collides directly with the bottom surface of the container and then diffuses irregularly, and large rotational flow and vortices may occur. This is a flow similar to that of FIG. 5, where there is no guide section, which causes the flow of the carrier gas to become unstable, reduces the liquid droplet transport efficiency, and increases the likelihood of liquid droplets remaining inside the container.

[0098] Meanwhile, the guide portion (150) formed in the droplet generating container (100) according to one embodiment of the present disclosure may include any shape inclined toward the carrier gas inlet (110) with respect to the upper surface of the container, thereby performing the function of inducing the carrier gas injected into the container to flow naturally along one surface of the guide portion (150). Specifically, the guide portion (150) may be formed inclined toward the lower direction of the carrier gas inlet (110) with respect to the upper surface of the container. The angle of inclination relative to the horizontal plane may be, for example, 10 to 60˚, 15 to 60˚, 20 to 60˚, 25 to 60˚, 30 to 60˚, 35 to 60˚, 40 to 60˚, 50 to 60˚, 10 to 50˚, 15 to 50˚, 20 to 50˚, 25 to 50˚, 30 to 50˚, 35 to 50˚, 40 to 50˚, 45 to 50˚, 10 to 45˚, 15 to 45˚, 20 to 45˚, 25 to 45˚, 30 to 45˚, 35 to 45˚, 40 to 45˚, 10 to 40˚, 15 to 40˚, 20 to The angle of inclination (angle of inclination) of the guide section (150) may be 40˚, 25 to 40˚, 30 to 40˚, 35 to 40˚, 10 to 35˚, 15 to 35˚, 20 to 35˚, 25 to 35˚, 30 to 35˚, 10 to 30˚, 15 to 30˚, 20 to 30˚, 25 to 30˚, 10 to 25˚, 15 to 25˚, 20 to 25˚, 10 to 20˚, or 15 to 20˚, but is not limited thereto. It is preferable that the angle of inclination (angle of tilt) of the guide section (150) be set so that the carrier gas injected into the carrier gas inlet (110) can directly collide with one side or the inclined surface of the guide section (150) to form a stable flow. This structure can control the flow of the carrier gas to suppress the generation of vortices and contribute to the stable transport of droplets.

[0099] FIG. 8 is a side view showing the structure of a droplet generating container (100) according to the first aspect of the present disclosure, and is a side view showing the gap (W) between the bottom of the guide portion (150) and the side wall of the container on the side of the transfer gas inlet (110), the gap (L) between the bottom of the guide portion (150) and the raw material solution (S), and the distance (H) between the bottom of the tube (160) and the bottom surface of the container.

[0100] Referring to FIG. 8, in a droplet generating container (100) according to the first aspect of the present disclosure, the gap (W) between the inclined end of the guide portion (150) and the side wall of the container on the carrier gas inlet side may be, for example, 30 mm or less, 25 mm or less, 20 mm or less, 15 mm or less, or 10 mm or less, but is not limited thereto. Meanwhile, the wider the gap (W), the larger the space through which the carrier gas passes, the more the flow of the carrier gas may be dispersed, and as a result, the speed of the carrier gas moving toward the outlet (120) may be reduced, and accordingly, the amount of droplet transported may be reduced. On the other hand, if the gap (W) is narrowed, the pressure of the carrier gas increases as it passes through the narrow passage, and it is guided toward the outlet (120) with a more concentrated flow, thereby improving the droplet transport efficiency.

[0101] Meanwhile, the gap (L) between the bottom of the guide section (150) and the raw material solution (S) may be set to be the same as the gap (W) between the bottom of the guide section (150) and the side wall of the container on the carrier gas inlet side, but is not limited thereto and can be appropriately adjusted according to the flow rate and velocity of the carrier gas, process conditions, etc. This configuration can play an important role in stabilizing the flow of the carrier gas and promoting the efficient transport of droplets.

[0102] Referring to FIGS. 2 and FIGS. 8, a droplet generating container (100) according to the first aspect of the present disclosure may further include a tube (160) inserted into the container through an outlet (120). Through the tube (160), the droplet generating container (100) may be indirectly connected to a heating section of a furnace, and droplets generated inside the container (100) may be discharged out of the container (100) along the tube (160) together with a transport gas and moved to a heating section of a furnace.

[0103] Specifically, the tube (160) may be formed in a tubular shape having a predetermined length, and its cross-section may be configured to be identical to the cross-section of the discharge port (120). The lower end of the tube (160) is positioned so as to be spaced apart from the bottom surface of the container (100), so that the transport gas can be smoothly discharged to the outside of the container (100) along the inside of the tube (160). Additionally, one end of the tube (160) may be located inside the container (100), and the other end may be connected to communicate with the heating part of a furnace outside the container (100), thereby allowing the generated droplets to be carried by the flow of the transport gas and directly delivered to the heating part. This structure enables efficient transport and heating while minimizing the loss of droplets.

[0104] As described above, the carrier gas injected into the carrier gas inlet (110) moves along the inclined surface of the guide section (150) to the bottom of the container and then flows toward the outlet (120) at a gentle angle with the bottom surface of the container. This flow is effective in pushing a large amount of droplets floating on the surface of the raw material solution (S) toward the outlet (120), but because the carrier gas inherently has a tendency to rise upward, as the carrier gas flows toward the outlet (120), the streamline of the carrier gas bends upward, and as a result, a dead zone may be formed at the bottom of the outlet (120) where the flow of the carrier gas does not reach.

[0105] To improve this problem, when a tube (160) is inserted through the outlet (120), the carrier gas is discharged outside the container as it passes through the tube (160), so the degree to which the upward streamline of the carrier gas bends is reduced by the length (height) of the inserted tube (160). In particular, as the distance (H) between the lower part of the tube (160) and the bottom surface of the container becomes shorter, the streamline of the carrier gas is formed in a shape closer to a straight line, and the vortex area at the upper part is expanded so that the influence of the flow is evenly distributed to the lower part of the outlet (120).

[0106] As a result, the above-described tube (160) configuration can substantially eliminate blind spots where the flow of the transport gas does not reach inside the droplet generating container (100), and can stably discharge almost all of the droplets generated inside the container (100) to the outside. Accordingly, the droplet transport efficiency is improved, and ultimately, the effect of increasing the amount of particles generated can be obtained.

[0107] The distance (H) between the lower end of the tube (160) inserted into the droplet generating container (100) according to an exemplary embodiment of the present disclosure and the bottom surface of the container (100) may be, for example, 5 to 100 mm, 5 to 55 mm, 5 to 45 mm, 5 to 35 mm, 5 to 30 mm, 5 to 25 mm, 5 to 20 mm, 5 to 15 mm, 5 to 10 mm, 10 to 10 mm, 10 to 90 mm, 10 to 80 mm, 10 to 70 mm, 10 to 60 mm, 10 to 50 mm, 10 to 40 mm, 10 to 30 mm, 10 to 20 mm, 10 to 15 mm, 15 to 95 mm, 15 to 85 mm, 15 to 75 mm, 15 to 65 mm, 15 to 55 mm, 15 to 45 mm, 15 to 35 mm, 15 to 25 mm, 20 to 100 mm, 20 to 90 mm, 20 to 80 mm, 20 to 70 mm, 20 to 60 mm, 20 to 50 mm, 20 to 40 mm, 20 to 30 mm, 25 to 95 mm, 25 to 85 mm, 25 to 75 mm, 25 to 65 mm, 25 to 55 mm, 25 to 45 mm, 25 to 35 mm, 30 to 100 mm, 30 to 90 mm, 30 to 80 mm, 30 to 70 mm, 30 to 60 mm, 30 to 50 mm, 30 to 40 mm, 35 to It may be 95 mm, 35 to 85 mm, 35 to 75 mm, 35 to 65 mm, 35 to 55 mm, 35 to 45 mm, 40 to 90 mm, 40 to 80 mm, 40 to 70 mm, 40 to 60 mm, 40 to 50 mm, 45 to 95 mm, 45 to 85 mm, 45 to 75 mm, 45 to 65 mm, or 45 to 55 mm, but is not limited thereto.

[0109] According to another embodiment of the present disclosure, as a method for manufacturing particles,

[0110] The method comprises the steps of: providing a raw material solution containing a metal salt to a droplet generating vessel; transmitting vibrations generated from an ultrasonic vibrator of a droplet generating device connected to the droplet generating vessel to the raw material solution through a vibration transmission unit to generate droplets inside the vessel; injecting a carrier gas into the droplet generating vessel to transfer the generated droplets to the outside of the vessel; and forming particles by thermally decomposing the droplets transferred to the outside of the vessel by the carrier gas at a high temperature.

[0111] A method for manufacturing particles may be provided, comprising: at least one carrier gas inlet formed on the upper part of the first side of the container to inject the carrier gas; an outlet formed on the upper part of the second side of the container to discharge a droplet that is transported together with the carrier gas; a raw material solution inlet formed on one side of the container to inject the raw material solution containing a metal salt; at least one vibration transmission part formed to generate the droplet by transmitting ultrasonic vibrations generated from the droplet generating device equipped with an ultrasonic vibrator to the raw material solution located inside the container; and a guide part formed in a plate shape extending obliquely from the upper surface of the container toward the lower direction of the carrier gas inlet to guide the flow direction of the carrier gas.

[0112] The vibration transmission unit may be positioned on the bottom or side of the droplet generating container so as to be in contact with the droplet generating device. The vibration transmission unit may be formed at a position corresponding to the vibrator of the droplet generating device. Additionally, the vibration transmission unit may be configured to directly transmit vibration energy generated from the droplet generating device to the raw material solution. The frequency of ultrasonic vibration is, for example, 10 to 100 kHz, 20 to 100 kHz, 30 to 100 kHz, 40 to 100 kHz, 50 to 100 kHz, 60 to 100 kHz, 70 to 100 kHz, 80 to 100 kHz, 90 to 100 kHz, 10 to 80 kHz, 20 to 80 kHz, 30 to 80 kHz, 40 to 80 kHz, 50 to 80 kHz, 60 to 80 kHz, 70 to 80 kHz, 10 to 60 kHz, 20 to 60 kHz, 30 to 60 kHz, 40 to 60 kHz, 50 to 60 kHz, 10 to 50 kHz, 20 to 50 The output of the ultrasonic vibration may be, but is not limited to, kHz, 30 to 50 kHz, 40 to 50 kHz, 10 to 30 kHz, 15 to 30 kHz, 20 to 30 kHz, 25 to 30 kHz, 10 to 20 kHz, 15 to 20 kHz, or 20 to 30 kHz. The output of the ultrasonic vibration may be, for example, 10 to 50 W, 20 to 50 W, 30 to 50 W, 40 to 50 W, 10 to 30 W, 15 to 30 W, 20 to 30 W, 25 to 30 W, 10 to 20 W, 15 to 20 W, or 20 to 30 W. Ultrasonic vibration conditions can affect the efficiency of droplet formation and the control of droplet particle size, and the set values ​​can be adjusted according to the system design or purpose.

[0113] The average diameter of droplets generated from a raw material solution through ultrasonic vibration is, for example, 1 to 100 µm, 5 to 100 µm, 10 to 100 µm, 20 to 100 µm, 30 to 100 µm, 40 to 100 µm, 50 to 100 µm, 60 to 100 µm, 70 to 100 µm, 80 to 100 µm, 90 to 100 µm, 1 to 80 µm, 5 to 80 µm, 10 to 80 µm, 20 to 80 µm, 30 to 80 µm, 40 to 80 µm, 50 to 80 µm, 60 to 80 µm, 1 to 60 µm, 5 to 60 µm, 10 to 60 µm, 20 The droplet size may be up to 60 μm, 30 to 60 μm, 40 to 60 μm, 50 to 60 μm, 1 to 50 μm, 5 to 50 μm, 10 to 50 μm, 20 to 50 μm, 30 to 50 μm, 40 to 50 μm, 1 to 30 μm, 5 to 30 μm, 10 to 30 μm, 20 to 30 μm, 1 to 20 μm, 5 to 20 μm, or 10 to 20 μm, but is not limited thereto, and the droplet size can be adjusted in various ways depending on vibration conditions, composition and viscosity of the raw material solution, etc.

[0114] The raw material solution can be injected at a constant flow rate through the raw material solution inlet. The flow rate of the raw material solution may be, for example, 1 to 20 mL / min, 3 to 20 mL / min, 5 to 20 mL / min, 7 to 20 mL / min, 10 to 20 mL / min, 1 to 15 mL / min, 3 to 15 mL / min, 5 to 15 mL / min, 7 to 15 mL / min, 10 to 15 mL / min, 1 to 10 mL / min, 3 to 10 mL / min, 5 to 10 mL / min, 7 to 10 mL / min, or 1 to 5 mL / min, but is not limited thereto. Meanwhile, the carrier gas may be injected through the carrier gas inlet, and the flow rate of the carrier gas may be injected at the same rate as the raw material solution. However, flow rate conditions may change depending on the structure of the device, the size of the container, and the characteristics of the generated droplets, and are not specifically limited.

[0115] The generated droplets can be converted into solid particles through a pyrolysis or heat treatment process, and applicable pyrolysis methods are not particularly limited, but may include commonly used methods such as spray pyrolysis, flame pyrolysis, microwave pyrolysis, or flash pyrolysis.

[0116] The raw material solution may contain a metal salt, and the metal salt is dissolved in a solvent so as to be dispersed into droplets by ultrasonic vibration in a solution state, and the solvent may be at least one selected from the group consisting of a water-based solvent, an organic solvent, an inorganic solvent, or a mixture thereof. The solvent may be, for example, water, thion water, alcohols (methanol, ethanol, isopropanol, etc.), glycols (ethylene glycol, diethylene glycol, etc.), ketones (acetone, methyl ethyl ketone, etc.), esters, amines, dimethylformamide (DMF), dimethyl sulfoxide (DMSO), etc., but is not limited thereto.

[0117] The particles manufactured according to exemplary embodiments of the present disclosure may be metal particles such as gold (Au), silver (Ag), copper (Cu), iron (Fe), nickel (Ni), cobalt (Co), tin (Sn), or alloys thereof, or semiconductor particles such as cadmium sulfide (CdS) or cadmium selenide (CdSe), carbon-based materials such as carbon fiber or carbon nanotube (CNT), or conductive polymer materials such as polythiazyl, polyacetylene, polyaniline, polythiophene, or polyphenylene sulfide, but are not limited thereto.

[0119] According to an exemplary embodiment of the present disclosure, a method for manufacturing particles using a droplet generating vessel,

[0120] The droplet generating container comprises: at least one carrier gas inlet formed on the upper part of the first side of the container for injecting a carrier gas; an outlet formed on the upper part of the second side of the container for discharging a droplet conveyed together with the carrier gas; a raw material solution injector formed on one side of the container for injecting a raw material solution containing a metal salt; at least one vibration transmission part formed in the same number as the vibrator at a position corresponding to the vibrator to transmit ultrasonic vibrations generated from a droplet generating device equipped with an ultrasonic vibrator to the raw material solution located inside the container to generate the droplet; and a guide part formed in a plate shape extending obliquely from the upper surface of the container toward the lower direction of the carrier gas inlet, formed to guide the flow direction of the carrier gas.

[0121] A method for manufacturing particles may be provided, comprising: a step of injecting a raw material solution containing a metal salt from a raw material solution storage unit containing the raw material solution through a raw material solution injector using a pump; a step of transmitting vibration energy into the interior of the container through a vibration transmission unit to generate and spray fine droplets from the raw material solution; a step of injecting a carrier gas through a carrier gas inlet to cause the carrier gas to flow along one surface of a guide unit to the bottom of the container; a step of inserting a tube into the interior of the container through an outlet such that a streamline of the carrier gas flowing through the bottom of the container along the longitudinal direction of the container forms an inclination angle of 1 to 30˚ with respect to the bottom surface of the container; and a step of discharging the carrier gas and droplets through the tube to a heating unit of a furnace located outside the container.

[0123] By using a droplet generating container according to one embodiment of the present disclosure, particles produced through the thermal decomposition process of droplets generated from a raw material solution are formed with uniform size and shape, thereby ensuring high reliability of the manufactured product in industrial fields requiring high-precision technology. In particular, the droplet generating container according to one embodiment of the present disclosure minimizes deformation or loss of droplets during the droplet generation and transport process, thereby simultaneously ensuring both particle yield and quality. Accordingly, the productivity and efficiency of the entire process can be maximized, and as a result, it can play a key role in reducing manufacturing costs and securing price competitiveness of the material.

[0125] The present disclosure will be explained in more detail below through examples. These examples are merely illustrative of the present disclosure and should not be interpreted as limiting the scope of the present disclosure.

[0127] Comparison of the streamline shape of the transported gas based on the presence or absence of a guide section

[0128] According to one embodiment of the present disclosure, droplet generating containers having a guide portion were manufactured such that the height from the bottom surface of the container to the discharge port was 100 mm, and the distance (H) between the lower end of the tube inserted into the container and the bottom surface of the container was set to 75 mm, 55 mm, 35 mm, 25 mm, 15 mm, and 5 mm, respectively, thereby producing droplet generating containers of Case 1-1 (Example 1), Case 1-2 (Example 2), Case 1-3 (Example 3), Case 1-4 (Example 4), Case 1-5 (Example 5), and Case 1-6 (Example 6).

[0129] Meanwhile, droplet generating containers that are not equipped with a guide section were manufactured, with the height from the bottom surface of the container to the discharge port being 100 mm, and the distance (H) between the lower end of the tube inserted into the container and the bottom surface of the container being set to 75 mm, 55 mm, and 35 mm, respectively, for Case 2-1 (Comparative Example 1), Case 2-2 (Comparative Example 2), and Case 2-3 (Comparative Example 3).

[0130] All experiments of Examples 1 to 6 and Comparative Examples 1 to 3 used air as the carrier gas and set the flow rate to 10 L / min.

[0131] Figure 9 is a diagram comparing the streamline shape of the transported gas with and without a guide.

[0132] Referring to FIG. 9, in Examples 1 to 6 equipped with a guide section, it was observed that the carrier gas is guided along one side of the guide section to the bottom of the container, forming a streamline at a gentle angle with the bottom surface of the container. This flow suggests that it can contribute to preventing deformation or destruction of droplets by suppressing the generation of vortices and stabilizing the flow of the carrier gas. On the other hand, in Comparative Examples 1 to 3 without a guide section, it was observed that the carrier gas injected into the container rises rapidly after colliding directly with the bottom surface of the container, diffuses irregularly, and generates large vortices.

[0133] In addition, as a result of comparing Examples 1 to 6, it was confirmed that as the distance (H) between the bottom of the tube and the bottom surface of the container becomes shorter, the area over which the transport gas flows along the bottom of the container widens, and accordingly, more droplets floating on the surface of the raw material droplets can be transported toward the outlet. This suggests that as the distance (H) between the bottom of the tube and the bottom surface of the container becomes shorter, it has a positive effect on improving droplet transport efficiency.

[0134] The results of comparing the Eddy viscosity values ​​of the droplet generating containers of Examples 1 to 6 and Comparative Examples 1 to 3 are shown in Table 1 and Table 2 below, respectively.

[0136] division Eddy viscosity (m 2 / s) division Eddy viscosity (m 2 / s) Example 1 (Case 1-1) 4.31054e-5 Example 4 (Case 1-4) 3.78E-05 Example 2 (Case 1-2) 4.07259e-5 Example 5 (Case 1-5) 3.67E-05 Example 3 (Case 1-3) 3.89952e-5 Example 6 (Case 1-6) 3.62E-05

[0138] division Eddy viscosity (m 2 / s) Comparative Example 1 (Case 2-1) 4.58324e-5 Comparative Example 2 (Case 2-2) 4.62476e-5 Comparative Example 3 (Case 2-3) 4.81110e-5

[0140] According to Table 1, in the experimental results of Examples 1 to 6 equipped with a guide section, it was confirmed that the eddy viscosity value gradually decreases as the distance (H) between the lower end of the tube inserted into the container and the bottom surface of the container decreases. This means that as the distance (H) decreases, the transport gas forms a more linear and stable streamline along the bottom surface of the container after passing the lower end of the tube, thereby suppressing the generation of turbulence and enabling efficient droplet transport. In other words, it has been experimentally proven that droplet transport efficiency can be effectively improved by optimizing the value of the distance (H) along with the presence of a guide section.

[0141] On the other hand, in the case of Comparative Examples 1 to 3, which are not equipped with a guide section according to Table 2, it was observed that the eddy viscosity value tended to decrease as the distance (H) between the bottom of the tube and the bottom surface of the container increased. This is because, in the absence of a guide section, the carrier gas forms an unstable flow structure that rises immediately after colliding directly with the bottom surface of the container, inducing an inefficient flow that must descend again to reach the bottom of the tube. This suggests that during this process, the gas flow is severely dispersed and vortices are amplified, increasing the turbulence intensity and consequently causing the fluid flow to become unstable.

[0142] In addition, according to Table 2, it was confirmed that the eddy viscosity values ​​of Comparative Examples 1 to 3, which are not equipped with a guide section, were generally higher than the eddy viscosity values ​​of Examples 1 to 3, which are equipped with a guide section according to Table 1. This means that in a structure without a guide section, turbulence occurs more strongly and energy loss is increased, thereby hindering the stable transport of droplets. Therefore, through the above experiment, it was clearly proven that a structure equipped with a guide section has a substantial effect in stabilizing the flow of the transport gas and improving the droplet transport efficiency.

[0144] Comparison of fluid behavior according to the gap (W) between the bottom of the guide section and the side wall of the container on the transfer gas inlet side

[0145] A droplet generating container having a guide portion according to one embodiment of the present disclosure was manufactured (Examples 7 to 9), wherein the height from the bottom surface of the container to the discharge port is 100 mm, the distance (H) between the lower end of the tube inserted into the container and the bottom surface of the container is 75 mm, and the gap (W) between the lower end of the guide portion and the container side wall on the side of the conveying gas inlet is 10 mm, 15 mm, and 20 mm, respectively.

[0146] Subsequently, in order to compare the effect of the gap (W) between the bottom of the guide section and the side wall of the container on the side of the carrier gas inlet on the flow of the carrier gas, an experiment was conducted to measure the velocity of the carrier gas passing through the outlet under each condition, and the results are shown in Table 3 below.

[0148] Example 7 (W = 10 mm) Example 8 (W = 15 mm) Example 9 (W = 20 mm) Maximum speed of the transported gas at the outlet (m / s) 0.169 0.167 0.166

[0150] According to Table 3, it was confirmed that as the gap (W) between the bottom of the guide section and the side wall of the container on the side of the transport gas inlet widens, the maximum speed of the transport gas measured at the outlet tends to decrease. This is a result of the transport gas moving stably along the guide section following a more concentrated flow as the gap (W) narrows, and the straightness to the outlet is improved. It was confirmed that a structure with a narrow gap between the bottom of the guide section and the side wall of the droplet generating container increases the speed of the transport gas and, consequently, acts favorably in transporting droplets more efficiently.

[0152] Comparison of streamline shapes of transported gases according to droplet generation container type

[0153] According to one embodiment of the present disclosure, the effect of the distance (H) between the lower end of the tube and the bottom surface of the container and the height of the container on the flow characteristics of the transported gas was evaluated for a scaled-up pilot-scale droplet generating container equipped with a guide portion.

[0154] All droplet generating vessels used in the experiment were equipped with 20 vibration transmission units (5x4 array), air as the carrier gas, and the flow rate was set to 10 L / min, and the experiment was conducted under the same conditions.

[0155] Case 3-1 (Example 10), Case 3-2 (Example 11), and Case 3-3 (Example 12) were each manufactured with a scaled-up pilot-scale droplet generating container by fixing the height from the bottom surface of the container to the outlet at 55 mm and setting the distance (H) between the lower part of the tube inserted into the container and the bottom surface of the container to 5 mm, 15 mm, and 25 mm, respectively.

[0156] In addition, Case 3-4 (Example 13), Case 3-2 (Example 14), and Case 3-3 (Example 15) were manufactured by fixing the height from the bottom surface of the container to the outlet at 115 mm, and setting the distance (H) between the lower part of the tube inserted into the container and the bottom surface of the container to 5 mm, 15 mm, and 25 mm, respectively, to scale up the pilot-scale droplet generating containers.

[0158] Figure 10 is a diagram comparing the streamline shapes of scaled-up pilot-scale droplet generating vessels of different heights.

[0159] The results of comparing the Eddy viscosity values ​​of each droplet generating container of Examples 10 to 15 above are shown in Table 4 below.

[0161] division Eddy viscosity (m 2 / s) division Eddy viscosity (m 2 / s) Example 10 (Case 3-1) 6.75E-06 Example 13 (Case 3-4) 7.29E-06 Example 11 (Case 3-2) 6.83E-06 Example 14 (Case 3-5) 7.73E-06 Example 12 (Case 3-3) 6.88E-06 Example 15 (Case 3-6) 7.74E-06

[0163] According to Table 4 above, even in a scaled-up pilot-scale droplet generating vessel, the eddy viscosity value decreased as the distance (H) between the bottom of the tube and the bottom surface of the vessel became shorter, which means that the carrier gas forms a more linear and stable flow. This trend is a result that demonstrates that the droplet transport efficiency is higher as the distance (H) becomes shorter, similar to the results of Examples 1 to 6 conducted earlier.

[0164] Meanwhile, when comparing Examples 10 to 12 and Examples 13 to 15, in which the height from the bottom surface of the container to the outlet was 55 mm and 115 mm, respectively, it was confirmed that when the height of the container itself is lowered, the internal volume of the container also decreases, and as the internal volume of the container becomes smaller, the overall vortex generation area decreases, and accordingly, the flow of the carrier gas tends to become smoother. This suggests that when designing the structure of a droplet generating container, reducing unnecessary internal space and minimizing vortex generation can contribute to stabilizing the flow of the carrier gas and improving the droplet transport efficiency.

[0166] The embodiments of the present disclosure have been described above. However, those skilled in the art to which the present disclosure pertains may make various modifications to the present disclosure within the scope of the technical concept of the present disclosure as described in the claims, such as simple design changes, the omission of some components, or simple changes in use depending on the specific application of the technology, and it is obvious that such modifications are also included within the scope of the rights of the present disclosure. Explanation of the symbols

[0167] 100: Droplet generating container according to the first aspect 110: Transfer gas inlet 120: Outlet 130: Raw material solution inlet 140: Vibration transmission unit 150: Guide Section 160: Tube 200: Droplet generating container according to the second side 210: Transfer gas inlet 220: Outlet 230: Raw material solution inlet 240: Vibration transmission unit 250: Guide Section 260: Tube 300: Droplet generating device according to the third aspect 310: Transfer gas inlet 320: Outlet 330: Raw material solution inlet 340: Vibration transmission unit 350: Guide Section 360: Tube 400: Raw material solution storage section 500: Droplet generator 510: Ultrasonic transducer S: Solution P: Pump V: Valve

Claims

Claim 1 A droplet generating container comprising: at least one carrier gas inlet formed on the upper part of a first side of the container for injecting a carrier gas; an outlet formed on the upper part of a second side of the container for discharging a droplet that is conveyed together with the carrier gas; a raw material solution injector formed on one side of the container for injecting a raw material solution containing a metal salt; at least one vibration transmission part formed to generate the droplet by transmitting ultrasonic vibrations generated from a droplet generating device equipped with an ultrasonic vibrator to the raw material solution located inside the container; and a guide part formed in a plate shape extending obliquely from the upper surface of the container toward the lower direction of the carrier gas inlet, and formed to guide the flow direction of the carrier gas. Claim 2 A droplet generating container according to claim 1, wherein the height of the first side of the container and the height of the second side of the container are the same. Claim 3 A droplet generating container according to claim 1, wherein the height of the first side of the container is formed lower than the height of the second side of the container, and the upper surface of the container is configured to be inclined from the first side of the container toward the second side of the container. Claim 4 A liquid droplet generating container according to paragraph 3, wherein the carrier gas inlet is formed at the lower end of the inclined upper surface of the container and the outlet is formed at the upper end of the inclined upper surface of the container, and the guide portion is disposed on the inclined surface between the carrier gas inlet and the outlet to form a flow path for the carrier gas such that the carrier gas injected into the container flows along one surface of the guide portion toward the bottom of the container and then flows toward the outlet. Claim 5 In paragraph 3, the upper surface of the container forms an angle of inclination of 5 to 30˚ with respect to a horizontal plane, forming a droplet generating container. Claim 6 A liquid drop generating container according to claim 1, wherein the ratio of the height of the first side of the container to the height of the second side of the container is 1:1 to 1:

5. Claim 7 A liquid droplet generating container according to claim 1, wherein the guide portion is formed in a concave shape with the upper surface of the container being indented inward, and is formed in a plate shape extending obliquely downward from the upper surface of the container toward the lower direction of the carrier gas inlet, and induces the carrier gas introduced through the carrier gas inlet to flow toward the lower direction of the container after colliding with one surface of the guide portion. Claim 8 A liquid droplet generating container according to claim 1, wherein the guide portion is a structure formed as a separate member fixed to the inner side of the upper surface of the container by a fastening, attachment, or coupling method, and is formed in a plate shape extending obliquely from the upper surface of the container toward the lower direction of the carrier gas inlet, and inducing the carrier gas introduced through the carrier gas inlet to flow toward the lower direction of the container after colliding with one surface of the guide portion. Claim 9 In claim 1, the guide portion is formed to be inclined downward toward the conveying gas inlet with respect to the upper surface of the container, and the guide portion has an inclination angle of 10 to 60˚ with respect to the horizontal plane, forming a droplet generating container. Claim 10 A liquid droplet generating container according to claim 1, wherein the gap between the inclined end of the guide portion and the side wall of the container on the conveying gas inlet side is 30 mm or less. Claim 11 A liquid droplet generating container according to claim 1, wherein the container further comprises a tube inserted into the container through the discharge port, the tube is formed in a tubular shape having a predetermined length, the cross-section of the tube is configured to be identical to the cross-section of the discharge port, and the lower end of the tube is positioned so as to be spaced apart from the bottom surface of the container, so that the conveying gas is discharged to the outside of the container through the tube. Claim 12 In claim 11, the distance between the lower end of the tube and the bottom surface of the container is 5 to 100 mm. Claim 13 A droplet generating container according to claim 11, wherein the carrier gas flows along the longitudinal direction of the container and passes through the lower part of the container to form a streamline, and the tube is inserted inside the container such that the streamline forms an angle of inclination of 1 to 30˚ with respect to a horizontal plane. Claim 14 A method for manufacturing particles comprises: a step of providing a raw material solution containing a metal salt to a droplet generating container; a step of generating a droplet inside the container by transmitting vibrations generated from an ultrasonic vibrator of a droplet generating device connected to the droplet generating container to the raw material solution through a vibration transmission unit; a step of injecting a carrier gas into the droplet generating container to transport the generated droplet to the outside of the container; and a step of forming particles by thermally decomposing the droplet transported to the outside of the container by the carrier gas at a high temperature; wherein the droplet generating container comprises: at least one carrier gas inlet formed on the upper part of a first side of the container to inject the carrier gas; an outlet formed on the upper part of a second side of the container to discharge the droplet transported together with the carrier gas; a raw material solution inlet formed on one side of the container to inject the raw material solution containing the metal salt; and at least one vibration transmission unit formed to generate the droplet by transmitting ultrasonic vibrations generated from the droplet generating device equipped with an ultrasonic vibrator to the raw material solution located inside the container. A method for manufacturing particles comprising: a guide portion formed in a plate shape extending obliquely from the upper surface of the container toward the lower direction of the carrier gas inlet, and formed to guide the flow direction of the carrier gas. Claim 15 A method for manufacturing particles according to claim 14, wherein the raw material solution may include a metal salt, the metal salt is dissolved in a solvent so as to be dispersed into droplets by ultrasonic vibration in a solution state, and the solvent is at least one selected from the group consisting of an aqueous solvent, an organic solvent, an inorganic solvent, or a mixture thereof. Claim 16 In claim 15, the above raw material solution is a method for producing particles having a viscosity of 0.5 to 20 mPa·s and a surface tension of 10 to 70 mN / m. Claim 17 A method for manufacturing particles according to claim 14, wherein the average diameter of the droplets generated from the raw material solution through the ultrasonic vibration is 1 to 100 μm. Claim 18 A method for manufacturing particles according to claim 14, wherein the vibration transmission unit is disposed in contact with the droplet generating device and the bottom or side surface of the droplet generating container, is formed at a position corresponding to the vibrator of the droplet generating device, and is configured to directly transmit vibrations generated from the droplet generating device to the raw material solution, and the ultrasonic vibrations are generated at a frequency of 10 to 100 kHz and an output of 10 to 50 W. Claim 19 A method for manufacturing particles according to claim 14, wherein the raw material solution and the carrier gas are injected at a flow rate of 1 to 20 mL / min. Claim 20 A method for manufacturing particles using a droplet generating container, wherein the droplet generating container comprises: at least one carrier gas inlet formed on the upper part of a first side of the container for injecting a carrier gas; an outlet formed on the upper part of a second side of the container for discharging a droplet conveyed together with the carrier gas; a raw material solution inlet formed on one side of the container for injecting a raw material solution containing a metal salt; at least one vibration transmission part formed in the same number as the vibrator at a position corresponding to the vibrator to transmit ultrasonic vibrations generated from a droplet generating device equipped with an ultrasonic vibrator to the raw material solution located inside the container to generate the droplet; and a guide part formed in a plate shape extending obliquely downward from the upper surface of the container toward the carrier gas inlet, formed to guide the flow direction of the carrier gas; and a step of injecting the raw material solution through the raw material solution inlet using a pump from a raw material solution storage part in which the raw material solution containing a metal salt is stored; and a step of transmitting vibration energy into the container through the vibration transmission part to generate and spray fine droplets from the raw material solution. A method for manufacturing particles comprising: a step of injecting a carrier gas through the carrier gas inlet to cause the carrier gas to flow along one surface of the guide portion to the lower portion of the container; a step of inserting the tube into the container through the outlet so that the streamline of the carrier gas flowing through the lower portion of the container along the longitudinal direction of the container forms an inclination angle of 1 to 30˚ with respect to the bottom surface of the container; and a step of discharging the carrier gas and droplets through the tube to a heating portion of a furnace located outside the container.

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