Laser preparation system and preparation method of micro-nano material

Abstract

The invention relates to the technical field of devices for preparing micro-nano materials through lasers, in particular to a laser preparation system and method for the micro-nano materials. The laser preparation system of the micro-nano material comprises a reaction unit, a monitoring unit, an electrophoresis power supply and a laser assembly, the reaction unit is used for preparing the micro-nano material, the monitoring unit is used for monitoring the movement and size change conditions of nano particles in real time, the electrophoresis power supply is used for providing voltage, and charged particles move towards electrodes with opposite electrical properties under the action of a direct-current electric field; the laser assembly provides laser to the reaction unit. The ionic surface active particles and the nano-particles are blended to enable the nano-particles to be charged, then charged particle swimming is achieved in an electrophoresis mode, liquid-phase media do not swim, then the adding efficiency of the nano-particles is improved, the collision probability among the nano-particles during laser irradiation is increased, the nano-particles collide uniformly, and the stability of the nano-particles is improved. The obtained particle size is uniform, and the defects of a device according to liquid flow in the prior art are overcome.

Description

Technical Field

[0001] The invention relates to the technical field of laser preparation of micro-nano materials, in particular to a laser preparation system and method for micro-nano materials. Background Art

[0002] Laser preparation of micro-nano materials is an advanced technology that uses the high energy, high focusing and high positioning accuracy of lasers to achieve efficient preparation and control of micro-nano materials by controlling the energy and position of the laser beam. Laser preparation of micro-nano materials has many advantages: the laser preparation process is usually non-contact, avoiding the contamination of materials by traditional contact processing methods, and can greatly improve the purity of materials; laser preparation of micro-nano materials is suitable for a variety of material types, including metals, non-metals, and semiconductors; laser preparation of micro-nano materials does not produce additional pollutants or waste, meets environmental protection requirements, and is conducive to sustainable development; laser preparation of micro-nano materials can achieve precise control of the structural morphology and size of micro-nano materials by adjusting laser parameters; laser preparation of micro-nano materials can usually be completed in a shorter time, and compared with some traditional chemical synthesis methods, it has faster production speed and shorter production cycle.

[0003] However, this technology can only produce micro-nano materials in the laboratory, and its productivity is low. In order to achieve higher-yield preparation and commercial production of laser micro-nano materials, liquid flow is usually used to achieve continuous preparation of micro-nano materials at this stage, and a device based on liquid flow is provided, which achieves the purpose of preparation by adjusting the relationship between the solution flow rate and the laser repetition frequency. However, in the device based on liquid flow, since both the nanoparticles and the liquid medium flow, the concentration of the colloidal solution is reduced, the collision probability between nanoparticles during laser irradiation is reduced, and the probability of their mutual fusion and growth is reduced. The prepared product has a small particle size and uneven particle size. Summary of the invention

[0004] In view of the deficiencies of the above-mentioned prior art, the present invention provides a laser preparation system and method for micro-nano materials. The present invention adopts ionic surfactant particles and nanoparticles to blend so that the nanoparticles are charged, and then adopts electrophoresis to realize the swimming of the charged particles, while the liquid medium does not swim, thereby improving the efficiency of nanoparticle addition, increasing the collision probability between nanoparticles during laser irradiation, and obtaining a uniform particle size. Through photoacoustic detection, the movement and size change of the nanoparticles are obtained, thereby realizing the controllable addition of nanoparticles and the controllable preparation of micro-nano material size, and overcoming the defects of the prior art devices based on liquid flow.

[0005] To achieve the above object, the technical solution of the present invention is as follows:

[0006] A laser preparation system for micro-nano materials, comprising:

[0007] The preparation unit is used to uniformly disperse the charged particles using a liquid medium to obtain a colloidal solution after dispersion. The liquid medium is such as deionized water and anhydrous ethanol. The charged particles are mixed with nanoparticles and ionic surfactant particles. Micro-nano materials are prepared using nanoparticles as raw materials, and ionic surfactant particles are used to make the nanoparticles charged.

[0008] The reaction unit is used to prepare micro-nano materials using colloidal solutions. The outer box is connected with the preparation unit, and a peristaltic pump is arranged between the two. The peristaltic pump is used to transport the colloidal solution to the outer box. The reaction unit includes an outer box, an inner box, opposite-polarity electrodes and like-polarity electrodes. The like-polarity electrodes have the same electrical properties as the charged particles. The inner box is nested in the outer box, and the two are connected. The like-polarity electrodes are installed between the outer box and the inner box. The design of the inner box and the outer box is used to ensure the stable installation of the like-polarity electrodes. The opposite-polarity electrodes are installed on the inner wall of the inner box.

[0009] The monitoring unit is used to monitor the movement and size change of nanoparticles in real time, realize the controllable addition of nanoparticles in the colloidal solution and the controllable preparation of the size of micro-nano materials; it includes a digital oscilloscope and two water immersion ultrasonic probes, the two water immersion ultrasonic probes are both penetrated and fixed on the outer box and the inner box, and the detection end of the water immersion ultrasonic probe extends into the inner box, and the two water immersion ultrasonic probes are electrically connected to the digital oscilloscope.

[0010] The electrophoresis power supply is used to provide voltage, which enables the charged particles to move toward the electrode with opposite charge under the action of the DC electric field, wherein the charged particles migrate while the liquid medium does not migrate, thereby improving the efficiency of nanoparticle addition. When the electrophoresis power supply is turned on, the charged particles move toward the opposite electrode, thereby realizing the controllable addition of nanoparticles. The electrophoresis power supply is electrically connected to the opposite electrode and the same electrode.

[0011] The laser component is used to provide laser to the inner box to realize the preparation of micro-nano materials and monitor the laser energy at the same time. The nanoparticles are irradiated with pulsed laser. This irradiation will cause optical absorption, which will be converted into heat after absorption, resulting in a temporary increase in local temperature. The temperature increase causes thermal elastic expansion, which is transmitted in the form of ultrasonic waves. The laser is used to prepare micro-nano materials. Through electrophoresis, photoacoustic detection, controlled addition of nanoparticles in colloidal solutions and in-situ real-time monitoring of size changes, the prepared micro-nano materials are dense and uniform, and the size is controllable. The laser component includes a laser emitter, a spectrometer and an energy meter. The spectrometer and the energy meter The energy meters are all set above the reaction unit, and a part of the laser emitted by the laser transmitter passes through the beam splitter and is projected into the inner box, interacting with the nanoparticles in the dispersion medium. The laser irradiation on these nanoparticles will cause changes in the photoacoustic signal. The relationship between the frequency domain information of the photoacoustic signal and the change in the size of the nanoparticles is obtained through a computer editing program. When the main frequency peak moves toward the low frequency direction and the spectrum integration area decreases, the size of the nanoparticles increases. When the main frequency peak moves toward the high frequency direction and the spectrum integration area increases, the size of the nanoparticles decreases; the other part is reflected to the energy meter to monitor the laser energy.

[0012] Preferably, the preparation unit includes a mixing box and an ultrasonicator, the ultrasonicator is located below the mixing box, and the outer box is connected to the mixing box. The ultrasonicator is used to process the colloidal solution to ensure that the colloidal solution is mixed evenly.

[0013] Preferably, the inner box is also connected to a collector through a collecting pipe, and a suction pump is provided on the collecting pipe. The solution obtained after the reaction is completed is discharged into the collector through the inner box under the action of the suction pump.

[0014] Preferably, the projection and reflection ratio of the beam splitter is 90% to 95%: 5% to 10%, and the sum of the projection and reflection ratios is 100%, that is, 90-95% of the laser light passes through the beam splitter into the reaction unit, and 5-10% of the laser light is reflected into the energy meter.

[0015] Preferably, the water immersion ultrasonic probe is located below the opposite-polarity electrode so that the water immersion ultrasonic probe contacts the colloid solution.

[0016] Preferably, the parameters of the suction pump and the peristaltic pump are consistent, so that the speed of entering the reaction unit is the same as the speed of withdrawing from the reaction unit, and the total amount of the colloidal solution in the reaction unit remains unchanged.

[0017] The present invention also protects a method for preparing a laser preparation system based on micro-nano materials, comprising the following steps:

[0018] The nanoparticles and ionic surfactant particles are added into a mixing box, and then a liquid medium is added, and ultrasonic mixing is performed by using an ultrasonicator to obtain a colloidal solution.

[0019] Use a peristaltic pump to transport the colloidal solution into the cavity between the outer box and the inner box, then flow into the inner box, and then turn off the peristaltic pump.

[0020] Turn on the electrophoresis power supply, switch it to the voltage regulation mode and adjust the voltage. At the same time, turn on the digital oscilloscope and laser assembly to monitor while preparing the micro-nano material until the micro-nano material of the desired size is obtained.

[0021] The obtained micro-nano material is transported to a collector by using a suction pump.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The laser preparation system of micro-nano materials of the present invention is composed of a reaction unit, a monitoring unit, an electrophoresis power supply and a laser component. The whole system is simple and reasonably designed. The reaction unit adopts a colloidal solution to prepare micro-nano materials. The colloidal solution is a mixture of charged particles and a liquid medium. The charged particles are a mixture of nanoparticles and ionic surfactant particles. The ionic surfactant particles make the nanoparticles charged. The monitoring unit monitors the movement and size change of the nanoparticles in real time. The electrophoresis power supply provides voltage, and under the action of a DC electric field, the charged particles move toward electrodes with opposite electrical properties. The laser component provides laser to the reaction unit to realize the preparation of micro-nano materials.

[0024] The present invention first charges the nanoparticles, and then uses electrophoresis technology to achieve controllable addition of nanoparticles in the colloidal solution. Under electrophoresis, only the charged particles migrate, and the liquid phase medium does not migrate. By adjusting the voltage, the movement speed of the charged particles is controlled, and the charged particles are collected, and lasers are used for concentrated irradiation, and nanoparticles are used to achieve efficient and uniform preparation of micro-nano materials. In addition, under the action of the electric field, in the process of laser preparation of micro-nano materials, the electric field further regulates the growth and arrangement of micro-nano materials to achieve preferential orientation of micro-nano materials. Preferentially oriented micro-nano materials can absorb light energy more effectively and convert it into heat energy. At the same time, preferential orientation can also reduce the scattering and reflection loss of light energy in micro-nano materials, significantly improve the light field coupling rate, and enhance the light-to-heat conversion efficiency.

[0025] 2. The present invention is provided with a monitoring unit, which includes a digital oscilloscope and two water immersion ultrasonic probes. The detection ends of the two water immersion ultrasonic probes are located in the reaction unit to directly collect parameters in the reaction unit. The digital oscilloscope collects relevant data, and the computer compiles the program and analyzes the collected data to monitor the movement and size changes of nanoparticles in real time, thereby realizing the controllable addition of nanoparticles and the controllable preparation of micro-nano material sizes.

[0026] 3. The present invention uses laser irradiation technology with a selective heating effect, so that the laser pulse interacts with the nanoparticles dispersed in the liquid medium in a suspended state, and selects appropriate laser parameters, such as laser wavelength and laser flux, so that the digital oscilloscope can collect data accurately and reduce errors.

[0027] 4. The precise control of the speed of adding nanoparticles and the real-time monitoring of the size changes of micro-nano materials in the present invention are the two core elements in the process of laser preparation of micro-nano materials. As an advanced detection technology, photoacoustic technology has shown unique advantages in this field. It has the ability of real-time monitoring, which means that the speed of adding nanoparticles can be captured instantly during the preparation process. The peristaltic pump transports the colloidal solution to the cavity between the outer box and the inner box without affecting the speed of capturing aggregation. The photoacoustic monitoring system detects the dynamic information of the speed and size changes of micro-nano materials, thereby ensuring the precise control of the production process. In addition, photoacoustic technology also has good penetration and can penetrate the surface of nanoparticles to conduct in-depth detection, which is crucial for understanding the internal structure and properties of micro-nano materials. It is particularly worth mentioning that when performing these tests, photoacoustic technology can achieve in-situ detection without adding any additional auxiliary equipment, which not only simplifies the detection process and reduces costs, but also avoids interference and errors that may be caused by the introduction of external equipment, further improving the accuracy and reliability of the detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the structure of the laser preparation system of micro-nano materials of the present invention.

[0029] Figure 2 It is a schematic diagram of the connection structure between the reaction unit and the water immersion ultrasonic probe of the present invention.

[0030] Figure 3 This is a graph showing the relationship between the frequency domain information of the photoacoustic signal irradiated by laser and the size change of TiO2 nanoparticles in Example 1 of the present invention.

[0031] Figure 4 This is a scanning electron microscopic morphology image S of the micro-nano material before and after laser irradiation of Example 1 of the present invention, wherein (a) is a scanning electron microscopic image of TiO2 nanoparticles before laser irradiation, and (b) is a scanning electron microscopic image of the TiO2 micro-nano material after laser irradiation.

[0032] Description of reference numerals:

[0033] 2-beam splitter; 3-energy meter; 4-water immersion ultrasonic probe; 5-digital oscilloscope; 6-electrophoresis power supply; 7-reaction unit; 8-like-charge electrode; 9-lead wire; 10-peristaltic pump; 11-hose; 12-preparation unit; 13-outer box; 14-inner box; 15-opposite-charge electrode; 16-suction pump; 17-collector. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0035] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

[0036] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "one side", "one end", "one side" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0039] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0040] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0041] The technical solution of the present invention is further described below by means of specific examples. In the following examples, the methods described are conventional methods unless otherwise specified; the reagents and materials described are commercially available unless otherwise specified.

[0042] Hereinafter, the laser preparation system and preparation method of micro-nano materials of the present invention will be described in detail with reference to the accompanying drawings and embodiments.

[0043] A laser preparation system for micro-nano materials, such as Figure 1-2 As shown, including:

[0044] The reaction unit 7 is used to prepare micro-nano materials using a colloidal solution, wherein the colloidal solution is a mixture of charged particles and a liquid medium, and the charged particles are a mixture of nanoparticles and ionic surfactant particles; the reaction unit 7 includes an outer box 13, an inner box 14, an opposite electrode 15 and a like electrode 8, and the like electrode 8 has the same electrical property as the charged particles; the inner box 14 is nested in the outer box 13, and the two are connected through, so that the colloidal solution flows into the inner box 14 through the outer box 13, the like electrode 8 is installed between the outer box 13 and the inner box 14, and the opposite electrode 15 is installed on the inner wall of the inner box 14, and the like electrode 8 with the charged particles is installed on the outside, and the opposite electrode 15 is installed on the inside.

[0045] The monitoring unit is used to monitor the movement and size change of the nanoparticles in real time, and includes a digital oscilloscope 5 and two water immersion ultrasonic probes 4. The two water immersion ultrasonic probes 4 are both installed on the reaction unit 7, and the detection ends of the water immersion ultrasonic probes 4 extend into the inner box 14. The two water immersion ultrasonic probes 4 are electrically connected to the digital oscilloscope 5 through a radio frequency conversion head.

[0046] The electrophoresis power source 6 is used to provide voltage to enable the charged particles to move toward the electrode with opposite electrical properties under the action of a DC electric field. The electrophoresis power source 6 is electrically connected to the opposite-charge electrode 15 and the same-charge electrode 8 through a wire 9 .

[0047] The laser component is used to provide laser to the reaction unit 7 to realize the preparation of micro-nano materials and monitor the laser energy at the same time.

[0048] Furthermore, the laser assembly includes a laser emitter, a spectrometer 2 and an energy meter 3. The spectrometer 2 and the energy meter 3 are both arranged above the reaction unit 7. The spectrometer 2 and the energy meter 3 are kept stable by a frame and are located above the reaction unit 7. A part of the laser emitted by the laser emitter passes through the spectrometer 2 and enters the inner box 14, and the other part is reflected to the energy meter 3.

[0049] Furthermore, the ratio of projection to reflection of the beam splitter 2 is 90-95:5-10. ， That is, 90-95% of the laser light passes through the beam splitter 2 and enters the inner box 14, and 5-10% of the laser light is reflected to the energy meter 3 for laser energy detection.

[0050] Furthermore, the outer box 13 is also connected to a preparation unit 12, in which a liquid medium, nanoparticles and ionic surfactant particles are blended to obtain a colloidal solution. A peristaltic pump 10 is arranged between the outer box 13 and the preparation unit 12, and the peristaltic pump 10 discharges the colloidal solution into the cavity between the outer box 13 and the inner box 14 through the preparation unit 12.

[0051] Furthermore, the preparation unit 12 includes a mixing box and an ultrasonic device, the ultrasonic device is located below the mixing box, and the outer box 13 is connected to the mixing box, and the peristaltic pump 10 connects the outer box 13 and the mixing box through a hose 11.

[0052] Furthermore, the inner box 14 is connected to a collector 17 through a collecting tube, and a suction pump 16 is provided on the collecting tube. After completing one micro-nano material preparation, the suction pump 16 is started to discharge the solution obtained after the reaction into the collector 17.

[0053] Furthermore, the immersion ultrasonic probe 4 is located below the opposite-polarity electrode 15 .

[0054] The laser preparation system for micro-nano materials is used to prepare micro-nano materials, which includes the following steps:

[0055] S1. Add nanoparticles and ionic surfactant particles into a mixing box of a preparation unit 12, then add a liquid medium, and perform ultrasonic mixing using an ultrasonic device to obtain a colloidal solution.

[0056] S2, using the peristaltic pump 10 to transport the colloidal solution to the cavity between the outer box 13 and the inner box 14, and then flowing the colloidal solution into the inner box 14, and then closing the peristaltic pump 10.

[0057] S3, turn on the electrophoresis power supply 6, control the voltage regulation mode, and adjust the voltage; the charged particles move toward the opposite electrode 15 to achieve controllable addition of nanoparticles, turn on the digital oscilloscope 5 and the laser assembly, use the laser emitter for laser irradiation, a part of the laser emitted by the laser emitter is projected into the inner box 14 through the beam splitter 2, and interacts with the nanoparticles in the dispersion medium. The laser irradiation on these nanoparticles will cause changes in the photoacoustic signal. The relationship between the frequency domain information of the photoacoustic signal and the change in the size of the nanoparticles is obtained through a computer editing program. When the main frequency peak moves toward the low frequency direction and the spectrum integration area decreases, the size of the nanoparticles increases. When the main frequency peak moves toward the high frequency direction and the spectrum integration area increases, the size of the nanoparticles decreases; the other part is reflected to the energy meter 3 to monitor the laser energy.

[0058] S4. The water-immersion ultrasonic probe 4 is used to collect the parameters in the inner box 14. The digital oscilloscope 5 collects the relevant data. The computer compiler program analyzes the collected data to monitor the movement and size change of the nanoparticles in real time.

[0059] S5. After obtaining the micro-nano material of the desired size, use a suction pump to extract the solution obtained after the reaction is completed.

[0060] The following specific samples are used for research, as shown below:

[0061] Example 1

[0062] The preparation method of TiO2 micro-nano material comprises the following steps:

[0063] S1. Dissolve 2 mg of TiO2 nanoparticles and 2 mg of Al(NO3)3·6H2O ionic surfactant particles in 100 mL of anhydrous ethanol. Ultrasonicate for 20 min and mechanically stir for 30 min. Under the stirring action of a magnetic rotor, the charged particles are evenly dispersed in the ethanol solution to obtain a colloidal solution.

[0064] S2, start the peristaltic pump 10, and discharge the colloidal solution into the cavity between the outer box 13 and the inner box 14 through the mixing box, with a flow rate of 5 mL / min. After the rated amount of colloidal solution is added, the colloidal solution flows into the inner box 14 through the cavity, and the peristaltic pump 10 is turned off.

[0065] S3, adjust the electrophoresis power supply 6 to the voltage stabilization mode, set the voltage to 100V, and the distance between the opposite electrode 15 and the like electrode 8 is 3cm. At this time, the positively charged particles move toward the opposite electrode 15, that is, toward the negative electrode. Turn on the digital oscilloscope 5 and the laser assembly, and use the laser transmitter for laser irradiation. A part of the laser emitted by the laser transmitter is projected into the inner box 14 through the beam splitter 2, and the other part is reflected to the energy meter 3 to monitor the laser energy. The wavelength of the laser transmitter is 1064nm, and the energy value is 100mJ / pluse.

[0066] S4, using the water immersion ultrasonic probe 4 to collect the parameters in the inner box 14, the water immersion ultrasonic probe 4 is selected from 2.5MH Z , the bandwidth is about 30%, the digital oscilloscope 5 collects relevant data, and the computer compilation program analyzes the collected data to monitor the movement and size change of nanoparticles in real time.

[0067] S4. After obtaining the micro-nano material of the desired size of 300-500 nm, use the suction pump 16 to extract the solution obtained after the reaction is completed, and then turn off the suction pump 16.

[0068] S5. Repeat the above steps until the desired amount of micro-nano material is obtained.

[0069] Figure 3 The relationship between the frequency domain information of the photoacoustic signal irradiated by laser and the size change of TiO2 nanoparticles in Example 1 of the present invention is shown in FIG. Figure 3 It can be seen that the main frequency peak moves toward the low frequency direction, and when the spectrum integration area decreases, the size of the nanoparticles increases.

[0070] Figure 4 This is a scanning electron microscopic image SEM of the micro-nano material before and after laser irradiation in Example 1 of the present invention. Figure 4 In the figure, (a) is a scanning electron microscope image of TiO2 nanoparticles before laser irradiation, and (b) is a scanning electron microscope image of TiO2 micro-nanomaterials after laser irradiation. Figure 4 The results show that the micro-nano materials obtained after laser irradiation are spherical particles with uniform particle size distribution.

[0071] In summary, the present invention realizes the movement of charged particles under the action of an electric field through electrophoresis, realizes the controllable addition of nanoparticles, adopts laser irradiation and in-situ monitoring, the nanoparticles are irradiated by a laser beam, and the nanoparticles use most of the laser energy for their own heating while transferring a small part of the heat to the liquid medium. These states will cause thermoelastic expansion and radiate photoacoustic signals outward. The photoacoustic signals are detected by a photoacoustic probe, the photoacoustic signals are collected by a digital oscilloscope 5, and the computer compiler program is used to analyze them to obtain the movement and size change of the nanoparticles, thereby realizing the controllable addition of nanoparticles and the controllable preparation of micro-nano material sizes.

[0072] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these changes and variations. The above-described embodiments are only preferred embodiments for fully illustrating the present invention, and their protection scope is not limited thereto. Equivalent substitutions or changes made by those skilled in the art on the basis of the present invention are all within the protection scope of the present invention, and the protection scope of the present invention shall be subject to the claims.

Claims

1. A laser preparation system for micro-nano materials, characterized in that: include: A reaction unit (7) is used to prepare micro-nano materials using a colloidal solution, wherein the colloidal solution is a mixture of charged particles and a liquid medium, and the charged particles are a mixture of nanoparticles and ionic surfactant particles; the reaction unit (7) comprises an outer box (13), an inner box (14), an opposite electrode (15) and a like electrode (8), wherein the like electrode (8) has the same electrical property as the charged particles; the inner box (14) is nested in the outer box (13), and the two are connected through, the like electrode (8) is installed between the outer box (13) and the inner box (14), and the opposite electrode (15) is installed on the inner wall of the inner box (14); A monitoring unit, which is used to monitor the movement and size change of the nanoparticles in real time, comprising a digital oscilloscope (5) and two water immersion ultrasonic probes (4), wherein the two water immersion ultrasonic probes (4) are both inserted through and fixed to the outer box (13) and the inner box (14), and the detection ends of the water immersion ultrasonic probes (4) extend into the inner box (14), and the two water immersion ultrasonic probes (4) are electrically connected to the digital oscilloscope (5); An electrophoresis power source (6) is used to provide a voltage to enable the charged particles to move toward an electrode of opposite electrical polarity under the action of a direct current electric field, wherein the electrophoresis power source (6) is electrically connected to the opposite-polarity electrode (15) and the same-polarity electrode (8); A laser component is used to provide laser to the inner box (14) to achieve the preparation of micro-nano materials and to monitor the laser energy at the same time.

2. The laser preparation system for micro-nano materials according to claim 1, characterized in that: The laser assembly comprises a laser emitter, a beam splitter (2) and an energy meter (3), wherein the beam splitter (2) and the energy meter (3) are both arranged above the reaction unit (7), and a part of the laser light emitted by the laser emitter passes through the beam splitter (2) and is projected into the inner box (14), and the other part is reflected into the energy meter (3).

3. The laser preparation system for micro-nano materials according to claim 2, characterized in that: The ratio of projection to reflection of the beam splitter (2) is 90% to 95%: 5% to 10%, and the sum of the ratios of projection and reflection is 100%.

4. The laser preparation system for micro-nano materials according to claim 3, characterized in that: The water immersion ultrasonic probe (4) is located below the opposite-polarity electrode (15).

5. The laser preparation system for micro-nano materials according to claim 4, characterized in that: The outer box (13) is also connected to a preparation unit (12), and a peristaltic pump (10) is provided between the outer box (13) and the preparation unit (12).

6. The laser preparation system for micro-nano materials according to claim 5, characterized in that: The preparation unit (12) comprises a mixing box and an ultrasonic device, wherein the ultrasonic device is located below the mixing box, and the outer box (13) is connected to the mixing box.

7. The laser preparation system for micro-nano materials according to claim 6, characterized in that: The inner box (14) is also connected to a collector (17) via a collecting pipe, and a suction pump (16) is provided on the collecting pipe.

8. The laser preparation system for micro-nano materials according to claim 7, characterized in that: The parameters of the suction pump (16) are consistent with those of the peristaltic pump (10).

9. A method for preparing a laser preparation system for micro-nano materials based on any one of claim 8, characterized in that: The steps include: Adding the nanoparticles and the ionic surfactant particles into the mixing box, and then adding the liquid medium, and performing ultrasonic mixing by using the ultrasonicator to obtain a colloidal solution; Using the peristaltic pump (10) to transport the colloidal solution into the cavity between the outer box (13) and the inner box (14), and then allowing the colloidal solution to flow into the inner box (14), and then closing the peristaltic pump (10); Turning on the electrophoresis power supply (6), adjusting it to a voltage stabilization mode and adjusting the voltage, and at the same time turning on the digital oscilloscope (5) and the laser assembly, monitoring the micro-nano material preparation while performing the preparation, until a micro-nano material of a desired size is obtained; The obtained micro-nano material is transported to the collector (17) using the suction pump (16).

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