Continuous collecting and sorting device and continuous collecting and sorting method for nano-particle materials

Abstract

The invention provides a continuous collecting and sorting device and method for nano-particle materials, and the device comprises an outer collecting container which comprises an outer container body and a container top cover, the container top cover is detachably installed on the outer container body and used for sealing a top opening of the outer container body, and the outer collecting container is used for collecting the nano-particle materials; a collecting hole is formed in the container top cover; the inner collecting container can be put into the outer collecting container through a top opening of the outer container main body and can be taken out from the outer collecting container; the inner collecting container is provided with an inner container body and an upper opening, the opening size of the upper opening is smaller than the cross section size of the position, at the same height, of the outer container body, and the upper opening is separated from the collecting hole in the height direction of the continuous collecting and sorting device and is opposite to the collecting hole.

Description

Technical Field

[0001] The present application belongs to the field of nano-particle material preparation, and in particular relates to a device and method for continuously collecting and sorting nano-particle materials. Background Art

[0002] Nanoparticles generally refer to material particles with a diameter between 1 and 100 nanometers. At present, the main preparation technologies for nanoparticle materials include ball milling, chemical vapor deposition (CVD) and plasma methods. The nanoparticle materials prepared by these methods need to be collected by a collection device. Document 1 describes a collection device, which includes a collection tank and a vacuum pump, which are coupled to the end of the experimental reaction device for effectively collecting nanoparticle materials. However, this collection device cannot perform preliminary screening based on the particle size of the nanoparticle material, and requires subsequent use of dispersant solution suspension, ultrasound, and centrifugation methods for sorting. However, this subsequent sorting process may introduce impurities, resulting in reduced performance and value of the nanoparticle material. Collection devices based on the same principle are also used in Documents 2, 3 and 4 to collect nanoparticle materials.

[0003] Document 5 describes a collection device for preparing nanoparticle materials based on a deposition method, which adds a rotating metal substrate to the original collection tank so that the nanoparticle materials can be deposited on the substrate. The advantage of this method is that the collected nanoparticle materials are of high purity, but the disadvantage is that the range of collected nanoparticle materials is limited, the collection amount and collection efficiency are low, and the particle size of the nanoparticle materials cannot be preliminarily screened, and impurities may be introduced in the subsequent sorting process. Moreover, as a rotating component, the metal substrate is prone to failure during actual use and has a long maintenance cycle.

[0004] Prior art literature:

[0005] Document 1: Li YL, Ishigaki T. Controlled one-step synthesis of nanocrystalline anatase and rutile TiO2 powders by in-flight thermal plasma oxidation[J]. The Journal of Physical Chemistry B, 2004, 108(40): 15536-15542.

[0006] Document 2: Sanders PG, Fougere GE, Thompson LJ, et al. Improvements in thesynthesis and compaction of nanocrystalline materials[J]. NanostructuredMaterials, 1997, 8(3):243-252.

[0007] Document 3: Woodard MP, Duncan M A.Laser synthesis and spectroscopy ofmolybdenum oxide nanorods[J].The Journal of Physical Chemistry C, 2019, 123(14):9560-9566.

[0008] Reference 4: Němec T, J,Gruber J,et al.Platinum and platinum oxidenanoparticles generated by unipolar spark discharge[J].Journal of AerosolScience,2020,141:105502.

[0009] Document 5: Mattei JG, Grammatikopoulos P, Zhao J, et al.Gas-phase synthesis of trimetallic nanoparticles[J]. Chemistry of Materials, 2019, 31(6):2151-2163. Summary of the invention

[0010] In order to overcome or alleviate the deficiencies of the above-mentioned prior art, one object of the present application is to provide a device for continuously collecting and sorting nanoparticle materials, which can efficiently and continuously collect nanoparticle materials and screen them according to their particle sizes to achieve the separation and collection of nanoparticle materials with different particle sizes, thereby improving the physical properties of the prepared nanoparticle materials. Another object of the present application is to provide a method for continuously collecting and sorting nanoparticle materials.

[0011] In order to achieve the above-mentioned invention objectives, the present application may adopt the following technical solutions.

[0012] The embodiment of the present application provides a device for continuously collecting and sorting nanoparticle materials, which comprises:

[0013] An outer collecting container, comprising an outer container body and a container top cover, wherein the container top cover is detachably mounted to the outer container body for closing a top opening of the outer container body, and the container top cover is formed with a collecting hole;

[0014] an inner collection container, capable of being placed into the outer collection container and taken out of the outer collection container through the top opening of the outer container body;

[0015] The inner collecting container comprises an inner container body and an upper opening, the opening size of the upper opening is smaller than the cross-sectional size of the outer container body at the same height position, and the upper opening is separated from and relatively arranged with the collecting hole in the height direction of the continuous collecting and sorting device.

[0016] In at least one embodiment, the outer collecting container is equipped with an air extraction hole for reducing the air pressure in the continuous collecting and sorting device.

[0017] In at least one embodiment, the air extraction hole is formed on the side wall of the outer container body, and the highest position of the air extraction hole is lower than the height of the upper opening.

[0018] In at least one embodiment, the gas pressure in the continuous collection and sorting device is in the range of 0.1 standard atmosphere to 1 standard atmosphere.

[0019] In at least one embodiment, the outer container body is cylindrical, and the inner container body is frustoconical.

[0020] In at least one embodiment, the inner collecting container includes an inner collecting pipe connected to an upper end of the inner container body, and an upper side opening of the inner collecting pipe forms the upper opening.

[0021] In at least one embodiment, the distance between the upper opening and the collecting hole is not less than the diameter of the upper opening.

[0022] In at least one embodiment, the distance between the upper opening and the collecting hole is 1.2 times to 2 times the diameter of the upper opening.

[0023] In at least one embodiment, the upper opening is circular and located at the center of the container top cover, the collecting hole is circular, the center of the upper opening and the center of the collecting hole are on the same vertical line, and the diameter of the upper opening is larger than the diameter of the collecting hole.

[0024] The embodiment of the present application further provides a method for continuously collecting and sorting nanoparticle materials, which uses the device for continuously collecting and sorting nanoparticle materials of the present application, and comprises:

[0025] The collecting hole formed on the top cover of the container is connected to the nanoparticle material outlet of the nanomaterial preparation device, and negative pressure is formed in the continuous collecting and sorting device. The larger particle size materials entering the continuous collecting and sorting device from the collecting hole fall vertically into the inner collecting container through the upper opening, and the smaller particle size materials are suspended in the continuous collecting and sorting device and fall outside the inner collecting container to the bottom of the outer collecting container after random thermal movement.

[0026] By adopting the above technical solution, the present application provides a device and method for continuous collection and sorting of nanoparticle materials. The device can comprehensively collect the nanoparticle materials produced in the preparation reaction to ensure the integrity of the collection. At the same time, on the basis of ensuring the purity of the nanoparticle materials, the one-step screening of the size of the nanoparticle materials is achieved, avoiding impurities that may be introduced during the subsequent separation and treatment process, thereby protecting the excellent properties of the nanomaterials to the maximum extent. In addition, the device has a simple structure, is easy to assemble, and has a high degree of modularization. Since there are no rotating mechanical parts, the failure rate is low and the service life is long. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a perspective schematic diagram of a device for continuously collecting and sorting nanoparticle materials according to one embodiment of the present application.

[0028] Figure 2A This is a photograph of the material collected in the inner collection container when the nanoparticle material is collected using the nanoparticle material continuous collection and sorting device according to one embodiment of the present application.

[0029] Figure 2B This is a photograph of the material collected in the outer collection container when the nanoparticle material is collected using the nanoparticle material continuous collection and sorting device according to one embodiment of the present application.

[0030] Figure 3A This is a SEM (scanning electron microscope) picture of the material collected in the inner collection container when the nanoparticle material is collected using the nanoparticle material continuous collection and sorting device according to one embodiment of the present application.

[0031] Figure 3B This is a SEM picture of the material collected in the external collection container when the nanoparticle material is collected using the nanoparticle material continuous collection and sorting device according to one embodiment of the present application.

[0032] Description of Reference Numerals

[0033] 10 External collection container

[0034] 11 Outer container body

[0035] 12 Container cover

[0036] 13. Bottom of the inner cavity

[0037] 20 Inner collection container

[0038] 21 Inner container body

[0039] 22 Upper opening

[0040] 23 Inner collecting tube

[0041] 24 Bottom

[0042] 111 Exhaust hole

[0043] 121 Collection hole DETAILED DESCRIPTION

[0044] The exemplary embodiments of the present application are described below with reference to the accompanying drawings. It should be understood that these specific descriptions are only used to teach those skilled in the art how to implement the present application, and are not intended to exhaust all feasible methods of the present application, nor to limit the scope of the present application.

[0045] The present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0046] like Figure 1 As shown, one embodiment of the present application provides a device for continuous collection and sorting of nanoparticle materials, which includes an outer collection container 10 and an inner collection container 20. The inner collection container 20 can be placed into the outer collection container 10 through the top opening of the outer container body 11, and the inner collection container 20 can be taken out of the outer collection container 10. It can be understood that the inner collection container 20 can be detachably nested inside the outer collection container 10, and the bottom of the inner collection container 20 is placed on the inner cavity bottom 13 of the outer collection container 10.

[0047] In this embodiment, if Figure 1 As shown, the outer collection container 10 includes an outer container body 11 and a container top cover 12. Specifically, the container top cover 12 can be detachably mounted on the outer container body 11 to close the top opening of the outer container body 11. The container top cover 12 is also provided with a collection hole 121, and the shape of the collection hole 121 is not limited and can be adjusted according to actual conditions, for example, it can be round, square, etc.

[0048] Preferably, in the present embodiment, the collecting hole 121 is circular in shape and is located at the center of the container top cover 12 .

[0049] In this embodiment, if Figure 1As shown, the inner collection container 20 includes an inner container body 21 and an upper opening 22. In addition, the inner collection container 20 may also include an inner collection tube 23 connected to the upper end of the inner container body 21, and the upper side opening of the inner collection tube 23 may form the upper opening 22. In the height direction of the continuous collection and sorting device, the upper opening 22 is separated from and relatively arranged with the collection hole 121. Specifically, the center of the upper opening 22 and the center of the collection hole 121 are on the same vertical line to ensure the accuracy of collecting the nanoparticle material.

[0050] Furthermore, the shapes of the outer container body 11 and the inner container body 21 are not limited. Figure 1 As shown, the outer container body 11 can be cylindrical, and the inner container body 21 can be frustum-shaped. The smaller diameter end of the frustum is connected to the inner collection tube 23, and the larger diameter end is the bottom 24 of the inner container body 21, which is placed on the inner cavity bottom 13 of the outer collection container 10. Here, the diameter of the bottom 24 of the inner container body 21 can be smaller than the diameter of the inner cavity bottom 13 of the outer collection container 10, so that it is convenient to nest the inner collection container 20 inside the outer collection container 10, so as to collect nanoparticle materials in the outer collection container 10.

[0051] Further, in this embodiment, the upper opening 22 may be circular in shape and located at the center of the container top cover 12 .

[0052] In this embodiment, the opening size of the upper opening 22 is smaller than the cross-sectional size of the outer container body 11 at the same height position. This is conducive to nesting the inner collection container 20 inside the outer collection container 10, so that nanoparticle materials of different particle sizes can be effectively separated. The diameter of the upper opening 22 can be larger than the diameter of the collection hole 121, which is conducive to improving the collection efficiency of the nanoparticle material.

[0053] Furthermore, the size of the upper opening 22 of the inner collection container 20 will affect the particle size of the sorted nano-particle material. Specifically, the larger the diameter of the upper opening 22, the smaller the particle size of the nano-particle material falling into the outer collection container 10 will be, while the particle size range of the nano-particle material falling into the inner collection container 20 will be larger. Therefore, the diameter of the upper opening 22 can be adjusted according to the actual collection and sorting conditions.

[0054] Preferably, in this embodiment, the diameter of the upper opening 22 may be 1.5 times the diameter of the collecting hole 121 .

[0055] In this embodiment, if Figure 1As shown, there is a certain distance between the upper opening 22 and the collecting hole 121. When the inner collecting container 20 is placed inside the outer collecting container 10, the height of the inner collecting container 20 is lower than the height of the outer collecting container 10. This is conducive to placing the discharge port for preparing nanoparticle materials between the container top cover 12 and the upper opening 22 during collection, so that nanoparticle materials with different particle sizes can be easily put into different collecting containers.

[0056] Further, in this embodiment, the distance between the upper opening 22 and the collecting hole 121 is not less than the diameter of the upper opening 22 .

[0057] Furthermore, in order to ensure the collection efficiency, the distance between the upper opening 22 and the collection hole 121 may be 1.2 times to 2 times the diameter of the upper opening 22 .

[0058] In this embodiment, if Figure 1 As shown, the outer collection container 10 may be provided with an air extraction hole 111, which is connected to an external air extraction pump to reduce the air pressure in the continuous collection and sorting device, thereby forming a negative pressure environment in the device. Specifically, the air extraction hole 111 may be provided on the side wall below the outer container body 11.

[0059] Furthermore, in order to ensure that the vacuuming process does not interfere with the normal falling of the nanoparticles, in this embodiment, the highest position of the vacuum hole 111 is lower than the height of the upper opening 22 of the inner collection container 20, thereby ensuring that the vacuuming process does not affect the collection and sorting efficiency of the nanoparticle material.

[0060] In this embodiment, the air extraction holes 111 can form negative pressure inside the continuous collection and sorting device, thereby reducing gas resistance, allowing large-diameter nanoparticle materials to fall vertically into the interior of the inner collection container 20 faster, thereby achieving a better collection effect.

[0061] It can be understood that the negative pressure environment formed in the continuous collection and sorting device mainly plays the role of accelerating the collection of nano-particle materials, and the air pressure in the device is mainly determined by the power and motive force of the vacuum pump.

[0062] Preferably, the air pressure in the continuous collection and sorting device can be set within the range of 0.1 standard atmosphere to 1 standard atmosphere.

[0063] The present application also provides a continuous collection and sorting method using a nanoparticle material continuous collection and sorting device, which may include the following steps.

[0064] The collecting hole 121 formed on the container top cover 12 is connected to the nanoparticle material outlet of the nanomaterial preparation device to form a negative pressure in the continuous collecting and sorting device; the larger particle size materials entering the continuous collecting and sorting device from the collecting hole 121 fall vertically into the inner collecting container 20 through the upper opening 22, and the smaller particle size materials are suspended in the continuous collecting and sorting device, and fall outside the inner collecting container 20 to the bottom of the outer collecting container 10 after random thermal movement.

[0065] In this embodiment, the discharge port for preparing the nanoparticle material is passed through the collection hole 121 on the container top cover 12 so that it is located between the top cover 12 and the upper opening 22 of the inner collection container 20. Under the action of gravity, the nanoparticle material will fall into the continuous collection and sorting device. Among them, the nanoparticle material with a larger particle size will fall vertically into the inner collection container 20 through the upper opening 22, while the material with a smaller particle size will be suspended in the outer collection container 10 due to its small mass-volume ratio, that is, low density, and will fall into the internal cavity formed by the outer collection container 10 and the inner collection container 20 after random thermal motion. Therefore, the outer collection container 10 and the inner collection container 20 can respectively collect nanoparticle materials of different particle sizes.

[0066] In this embodiment, the inner collection container 20 can be used to collect nanoparticle materials with larger particle sizes, while the outer collection container 10 can be used to collect nanoparticle materials with smaller particle sizes.

[0067] Further, the nanoparticle material with a larger particle size includes particles with a diameter greater than 150 nm, and the nanoparticle material with a smaller particle size includes particles with a diameter less than or equal to 150 nm.

[0068] In this embodiment, according to the different densities and movement characteristics of nanoparticles of different particle sizes, all nanoparticles produced in the preparation reaction can be collected as much as possible through the outer collector 10 and the inner collector 20 to ensure the integrity of the collection. At the same time, the nanoparticles are sorted to achieve the initial screening and separation at the initial stage of the collection of the nanoparticles, so that the average particle size of the nanoparticles collected after the reaction is reduced, and the physical properties of the prepared nanoparticles are improved.

[0069] In addition, the nanoparticle material with a larger particle size includes unreacted residual raw materials and precursors. These large-size nanoparticles are collected by the inner collection container 20, so that the unreacted residual raw materials and precursors can be recycled and reused as raw materials for preparing nanoparticle materials next time. Relevant test results show that the average level of various physical properties of the nanoparticle material prepared again using the recycled raw materials is better than that of the nanoparticle material prepared for the first time. At the same time, the recovery of unreacted residual raw materials and precursors also saves material resources, improves the utilization rate of raw materials, further reduces the cost of nanoparticle preparation, and promotes the large-scale industrial application of nanoparticles.

[0070] The present application also provides the morphology and characterization results of the collected nanoparticle materials. Specifically, the nanoparticle materials are prepared by a plasma method.

[0071] Figure 2A A photo showing the material collected by the inner collection container 20 is shown. Figure 2B A pictorial photograph of the material collected by the outer collection container 10 is shown.

[0072] like Figure 2A and Figure 2B As shown, the size of the sample collected and sorted by the inner collection container 20 is significantly larger than the size of the sample collected and sorted by the outer collection container 10 .

[0073] The samples collected and sorted in the outer collection container 10 and the inner collection container 20 are further observed for their microscopic morphology under a SEM (scanning electron microscope). Figure 3A and Figure 3B As shown. Among them, Figure 3A is a SEM image of the material collected in the inner collection container 20, Figure 3B is a SEM image of the material collected in the outer collection container 10.

[0074] It can be found that the sample size collected and sorted by the inner collection container 20 is larger, while the sample size collected and sorted by the outer collection container 10 is smaller. Therefore, it can be known that the continuous collection and sorting device and the continuous collection and sorting method provided by the present application can be used to effectively sort nanoparticle materials. Moreover, the samples collected and sorted by the inner collection container 20, including the remaining raw materials and precursors that have not been reacted, can be recycled and used for further preparation, realizing the recycling and reuse of raw material resources.

[0075] By adopting the above scheme, in the nanoparticle material continuous collection and sorting device provided by the present application, the nanoparticle materials are sorted by utilizing the different densities and movement characteristics of nanoparticle materials of different particle sizes, which can ensure that under the premise of pure collection, one-step screening and separation are achieved, avoiding impurities that may be introduced during subsequent processing, thereby protecting the excellent properties of the nanoparticle materials to the maximum extent. In addition, the screening and separation process reduces the average particle size of the collected nanoparticle materials, thereby improving the physical properties of the prepared nanoparticle materials.

[0076] In addition, the nanoparticle material continuous collection and sorting device provided by the present application has a simple structure, is easy to assemble, and has a high degree of modularization. Since there is no rotating mechanical structure, the problem of easy failure and short life due to rotating mechanical structural parts in the collection device in the prior art is avoided.

Claims

1. A device for continuously collecting and sorting nanoparticle materials, characterized in that: include: An outer collecting container (10), comprising an outer container body (11) and a container top cover (12), wherein the container top cover (12) is detachably mounted to the outer container body (11) and is used to close the top opening of the outer container body (11), and the container top cover (12) is formed with a collecting hole (121); An inner collection container (20), capable of being placed into the outer collection container (10) and taken out of the outer collection container (10) via the top opening of the outer container body (11); The inner collecting container (20) comprises an inner container body (21) and an upper opening (22), wherein the opening size of the upper opening (22) is smaller than the cross-sectional size of the outer container body (11) at the same height position, and the upper opening (22) is separated from and arranged opposite to the collecting hole (121) in the height direction of the continuous collecting and sorting device.

2. The device for continuous collection and separation of nanoparticle materials according to claim 1, characterized in that: The outer collecting container (10) is equipped with an air extraction hole (111) for reducing the air pressure in the continuous collecting and sorting device.

3. The device for continuous collection and separation of nanoparticle materials according to claim 2, characterized in that: The air extraction hole (111) is formed on the side wall of the outer container body (11), and the highest position of the air extraction hole (111) is lower than the height of the upper opening (22).

4. The device for continuous collection and separation of nanoparticle materials according to claim 1, characterized in that: The air pressure in the continuous collection and sorting device is in the range of 0.1 standard atmosphere to 1 standard atmosphere.

5. The device for continuous collection and separation of nanoparticle materials according to claim 1, characterized in that: The outer container body (11) is cylindrical, and the inner container body (21) is frustoconical.

6. The device for continuous collection and separation of nanoparticle materials according to claim 5, characterized in that: The inner collecting container (20) includes an inner collecting pipe (23) connected to the upper end of the inner container body (21), and an upper opening of the inner collecting pipe (23) forms the upper opening (22).

7. The device for continuous collection and separation of nanoparticle materials according to claim 1, characterized in that: The distance between the upper opening (22) and the collecting hole (121) is not less than the diameter of the upper opening (22).

8. The device for continuous collection and separation of nanoparticle materials according to claim 7, characterized in that: The distance between the upper opening (22) and the collecting hole (121) is 1.2 to 2 times the diameter of the upper opening (22).

9. The device for continuous collection and separation of nanoparticle materials according to claim 1, characterized in that: The upper opening (22) is circular and located at the center of the container top cover (12); the collecting hole (121) is circular; the center of the upper opening (22) and the center of the collecting hole (121) are on the same vertical line; and the diameter of the upper opening (22) is greater than the diameter of the collecting hole (121).

10. A method for continuously collecting and sorting nanoparticle materials, characterized in that: It uses the nanoparticle material continuous collection and sorting device according to any one of claims 1 to 9, and the continuous collection and sorting method comprises: The collecting hole (121) formed on the container top cover (12) is connected to the nano-particle material outlet of the nano-material preparation device, and negative pressure is formed in the continuous collecting and sorting device. The larger particle size materials entering the continuous collecting and sorting device from the collecting hole (121) vertically fall into the inner collecting container (20) through the upper opening (22), and the smaller particle size materials are suspended in the continuous collecting and sorting device and fall to the bottom of the outer collecting container (10) outside the inner collecting container (20) after random thermal movement.

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