A discrete catalyst screening spray system and method for carbon material growth

Abstract

The present application relates to the field of discrete catalyst spraying technology, and discloses a discrete catalyst screening and spraying system and method for carbon material growth, wherein the spraying system comprises an aerodynamic lens, one end of the aerodynamic lens is provided with an electric spark device, the other end of the aerodynamic lens is connected with a vacuum spraying chamber, a motion system is arranged in the vacuum spraying chamber, the motion system comprises a substrate rolling unit and a substrate moving unit, a flow limiting hole, a buffer chamber one, a carrier gas inlet, a sheath gas inlet, a buffer chamber two, a focusing hole, a buffer chamber three and an acceleration nozzle are sequentially arranged in the aerodynamic lens, the acceleration nozzle is communicated with the inside of the vacuum spraying chamber through a connecting port, and the acceleration nozzle is communicated with the outside through a gas outlet. The present application adopts the above-mentioned discrete catalyst screening and spraying system and method for carbon material growth, utilizes the aerodynamic lens to realize the screening and discrete spraying of nanometer catalyst, and realizes the discrete distribution of nanometer catalyst particles on the whole substrate through the motion system of the vacuum spraying chamber.

Description

Technical Field

[0001] This invention relates to the field of discrete catalyst spraying technology, and in particular to a discrete catalyst screening and spraying system and method for carbon material growth. Background Technology

[0002] A catalyst generally refers to a substance that increases the reaction rate without altering the overall standard Gibbs free energy change. It can also be described as a substance that increases the rate of a chemical reaction without changing the chemical equilibrium, and whose mass and chemical properties remain unchanged before and after the reaction. Nanocatalysts typically refer to catalysts with active components having a particle size of less than 100 nm. In modern industrial production, nanocatalysts are frequently sprayed onto substrates for processing. However, impurities and uneven spraying during the process can affect the quality of the coating. Therefore, the screening and spraying of nanocatalysts is a crucial technology in industrial production.

[0003] In existing technologies, the separation and screening of nanocatalyst particles mostly utilizes methods such as plasmon resonance, which are complex, bulky, and inconvenient to use. Furthermore, existing spraying equipment involves large coating volumes, failing to obtain discrete particles and requiring solvent dispersion, which is highly inconvenient. Aerodynamic lenses can be used to focus aerosol bundles, and aerodynamically charged electrosonic particle lenses can be applied to aerosol aggregation for easier detection. Therefore, there is a lack of a nanocatalyst particle screening and spraying system that can utilize aerodynamic prisms to screen large-diameter catalysts and achieve discrete spraying of nanocatalysts, thereby hindering high-temperature agglomeration and artificially dividing the catalyst into discontinuous regions to improve the growth quality of carbon materials. Summary of the Invention

[0004] To address the problems mentioned above in the background art, the present invention provides a discrete catalyst screening and spraying system and method for carbon material growth. It utilizes an aerodynamic prism to achieve the screening and discrete spraying of nano-catalysts, artificially dividing the catalyst into discontinuous regions, and using a motion system in a vacuum spraying chamber to achieve discrete distribution of nano-catalyst particles across the entire substrate.

[0005] To achieve the above objectives, the present invention provides a discrete catalyst screening and spraying system for carbon material growth, comprising an aerodynamic prism, one end of which is equipped with an electric spark device, and the other end of which is connected to a vacuum spraying chamber. A motion system is provided inside the vacuum spraying chamber, comprising a substrate rolling unit and a substrate moving unit. The aerodynamic prism is sequentially provided with a flow-limiting orifice, a first buffer chamber, a carrier gas inlet, a sheath gas inlet, a second buffer chamber, a focusing orifice, a third buffer chamber, and an accelerating nozzle. The accelerating nozzle is connected to the interior of the vacuum spraying chamber through a connection port and to the outside through a gas outlet.

[0006] Preferably, the electrical spark device is located at the end of the aerodynamic prism near the flow-limiting orifice.

[0007] Preferably, the aerodynamic prism is provided with a connecting pipe, one end of which is connected to the outside through a sheath gas inlet, and the other end of which is set as an opening.

[0008] Preferably, the aerodynamic prism is provided with a second connecting pipe, which is located inside the first connecting pipe. One end of the second connecting pipe is connected to the buffer chamber through several connecting pipes, and the other end of the second connecting pipe is open.

[0009] Preferably, the aerodynamic prism is provided with a connecting pipe three, which is located inside the connecting pipe two. One end of the connecting pipe three is connected to the outside through a carrier gas inlet, and the other end of the connecting pipe three is an opening.

[0010] Preferably, the substrate rolling unit includes a stepper motor, the output shaft of which is connected to one end of a rotating roller for driving the substrate to roll up and down. The rotating roller is rotatably mounted on the top of the mounting frame, and a rotating roller is rotatably mounted on the bottom of the mounting frame. The substrate is mounted on the rotating roller and the rotating roller.

[0011] Preferably, the substrate moving unit includes a second stepper motor, the output shaft of the second stepper motor is connected to a rotating rod, the rotating rod is connected to a slider through a lead screw transmission structure, a moving frame is provided on the slider, and the moving frame is connected to the mounting frame.

[0012] This invention provides a discrete catalyst screening and spraying method for carbon material growth, comprising the following steps:

[0013] Step 1: The electrical discharge device generates nano-catalyst particles through high-voltage direct current electric spark discharge;

[0014] Step 2: The nanocatalyst particles and the carrier gas form an aerosol, which reaches a laminar flow state in buffer chamber 1 after passing through the flow-limiting orifice.

[0015] Step 3: Adjust the carrier gas flow rate through the carrier gas inlet. The carrier gas disperses the nano-catalyst particles coming out of the buffer chamber, so that the nano-catalyst particles can flow uniformly with the gas.

[0016] Step four: Sheath gas is introduced through the sheath gas inlet to restrict the lateral diffusion of the nano-catalyst particles. The airflow is controlled to keep the nano-catalyst particles away from the wall. The nano-catalyst particles pass through buffer chamber two, focusing hole, buffer chamber three, and finally pass through the accelerating nozzle to be sprayed onto the substrate of the vacuum spraying chamber. The gas is extracted from the gas outlet by the vacuum pump.

[0017] Step 5: The substrate rolling unit and the substrate moving unit make the substrate roll up and down and move left and right, so as to achieve the discrete distribution of nano-catalyst particles on the entire substrate.

[0018] Therefore, the discrete catalyst screening and spraying system and method for carbon material growth described above have the following beneficial effects:

[0019] (1) The present invention integrates the generation, filtration and spraying of nano-catalysts into one, making the process simpler and avoiding contact between nano-catalysts and other impurities.

[0020] (2) The present invention filters nano-catalyst particles by using an aerodynamic prism. By controlling the prism aperture size, smaller particles can be screened without the need for other devices outside the system.

[0021] (3) By adjusting the distance between the substrate and the accelerating nozzle and by controlling the working time of the electric spark device, the present invention can deposit nano-catalyst particles of different densities and control the dispersion of nano-catalyst particles on the substrate.

[0022] (4) The present invention regulates the flow rate of the carrier gas through the carrier gas inlet, and the carrier gas disperses the nano-catalyst particles coming out of the buffer chamber, so that the nano-catalyst particles can flow uniformly with the gas; the sheath gas is introduced through the sheath gas inlet to restrict the lateral diffusion of the nano-catalyst particles, and the size of the airflow is controlled to keep the nano-catalyst particles away from the wall.

[0023] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of an embodiment of a discrete catalyst screening and spraying system for carbon material growth according to the present invention;

[0025] Figure 2 This is a cross-sectional view of an embodiment of a discrete catalyst screening and spraying system for carbon material growth according to the present invention;

[0026] Figure 3This is an aerodynamic prism cross-sectional view of an embodiment of a discrete catalyst screening and spraying system for carbon material growth according to the present invention.

[0027] Figure 4 This is a schematic diagram of the connecting pipe structure of an embodiment of a discrete catalyst screening and spraying system for carbon material growth according to the present invention;

[0028] Figure 5 This is a schematic diagram of the motion system structure of an embodiment of a discrete catalyst screening and spraying system for carbon material growth according to the present invention;

[0029] Figure 6 This is a cross-sectional view of an embodiment of a discrete catalyst screening and spraying system for carbon material growth according to the present invention.

[0030] Figure Labels

[0031] 1. Electrical discharge machining device; 2. Aerodynamic prism; 3. Vacuum spraying chamber; 4. Flow limiting orifice; 5. Buffer chamber one; 6. Buffer chamber two; 7. Buffer chamber three; 8. Sheath gas inlet; 9. Connecting pipe one; 10. Connecting pipe two; 11. Connecting pipe; 12. Carrier gas inlet; 13. Connecting pipe three; 14. Focusing orifice; 15. Accelerating nozzle; 16. Connection port; 17. Gas outlet; 18. Rotating roller one; 19. Rotating roller two; 20. Stepper motor one; 21. Mounting bracket; 22. Stepper motor two; 23. Moving frame; 24. Substrate; 25. Rotating rod. Detailed Implementation

[0032] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0033] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. The terms "set," "install," and "connect" should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two elements. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0034] Example

[0035] like Figure 1 , Figure 2 As shown, the discrete catalyst screening and spraying system for carbon material growth according to the present invention includes an aerodynamic prism 2, one end of which is equipped with an electric spark device 1, and the other end of the aerodynamic prism 2 is connected to a vacuum spraying chamber 3. The aerodynamic prism 2 contains, in sequence, a flow-limiting orifice 4, a first buffer chamber 5, a carrier gas inlet 12, a sheath gas inlet 8, a second buffer chamber 6, a focusing orifice 14, a third buffer chamber 7, and an accelerating nozzle 15. The accelerating nozzle 15 communicates with the interior of the vacuum spraying chamber 3 through a connection port 16 and with the outside through a gas outlet 17. The electric spark device 1 is located at the end of the aerodynamic prism 2 near the flow-limiting orifice 4. The electric spark device 1 generates nano-catalyst particles through high-voltage DC electric spark discharge. The electric spark device 1 has an external power supply and a carrier gas source. The focusing orifice 14 is a circular orifice with a diameter of 2-6 mm, and there may be one or more such orifices in the entire aerodynamic prism 2.

[0036] like Figure 3 , Figure 4 As shown, the aerodynamic prism 2 is equipped with a connecting pipe 1 (9), one end of which is connected to the outside via a sheath gas inlet 8, and the other end of which is open. The gas entering through the sheath gas inlet 8 primarily restricts the lateral diffusion of the nanocatalyst particles. By controlling the airflow, the nanocatalyst particles can be moved away from the wall surface. The aerodynamic prism 2 is also equipped with a connecting pipe 2 (10), located inside the connecting pipe 1 (9). One end of the connecting pipe 2 (10) is connected to a buffer chamber via several connecting pipes 11, and the other end of which is open. Furthermore, the aerodynamic prism 2 is equipped with a connecting pipe 3 (13), located inside the connecting pipe 2 (10). One end of the connecting pipe 3 (13) is connected to the outside via a carrier gas inlet 12, and the other end of which is open. The gas entering through the carrier gas inlet 12 primarily disperses the nanocatalyst particles exiting from the buffer chamber 5, allowing them to flow uniformly with the gas flow. The nano-catalyst particles generated by the electric spark device 1 are sequentially injected into the vacuum spraying chamber 3 through the flow limiting hole 4, buffer chamber 1 5, connecting pipe 11, connecting pipe 2 10, buffer chamber 2 6, focusing hole 14, and buffer chamber 3 7 by the accelerating nozzle 15.

[0037] like Figure 5As shown, a motion system is installed inside the vacuum coating chamber 3, comprising a substrate rolling unit and a substrate moving unit. The substrate rolling unit includes a stepper motor 20, the output shaft of which is connected to one end of a rotating roller 18 used to drive the substrate 24 to roll up and down. The rotating roller 18 is rotatably mounted on the top of the mounting frame 21, and a rotating roller 19 is rotatably mounted on the bottom of the mounting frame 21. The substrate 24 is mounted on the rotating rollers 18 and 19. The substrate moving unit includes a stepper motor 22, the output shaft of which is connected to a rotating rod 25. The rotating rod 25 is connected to a slider via a lead screw transmission structure. A moving frame 23 is mounted on the slider and connected to the mounting frame 21. The stepper motor 20 drives the rotating roller 18 to rotate, thereby causing the substrate 24 to roll up and down on the rotating rollers 18 and 19. The lead screw transmission structure includes existing bevel gear sets and existing lead screw structures, and is located inside the housing of the motion system. Stepper motor 22 drives rotating rod 25 to rotate. The rotation of rotating rod 25 changes direction through bevel gear set, causing the lead screw in the lead screw structure to drive the slider to move left and right, which in turn drives the moving frame 23 to move left and right. The left and right movement of the moving frame 23 drives the mounting frame 21 to move left and right, and the left and right movement of the mounting frame 21 drives the substrate 24 to move left and right.

[0038] The present invention discloses a discrete catalyst screening and spraying method for carbon material growth, comprising the following steps:

[0039] Step 1: The electric spark device 1 generates nano-catalyst particles through high-voltage direct current electric spark discharge;

[0040] Step 2: The nano-catalyst particles form an aerosol with the carrier gas, which reaches a laminar flow state in the buffer chamber 5 after passing through the flow-limiting orifice 4.

[0041] Step 3: Adjust the carrier gas flow rate through carrier gas inlet 12. The carrier gas disperses the nano-catalyst particles coming out of buffer chamber 5, so that the nano-catalyst particles can flow evenly with the gas.

[0042] Step 4: Sheath gas is introduced through sheath gas inlet 8 to restrict the lateral diffusion of nanocatalyst particles. The size of the airflow is adjusted to make the nanocatalyst particles move away from the wall. The nanocatalyst particles pass through buffer chamber 2 6, focusing hole 14, buffer chamber 3 7, and finally pass through acceleration nozzle 15 to be sprayed onto substrate 24 of vacuum spraying chamber 3. The gas is extracted from gas outlet 17 by vacuum pump.

[0043] Step 5: The substrate 24 rolling unit and the substrate 24 moving unit make the substrate 24 roll up and down and move left and right, so as to achieve the discrete distribution of nano-catalyst particles on the entire substrate 24.

[0044] Finally, the substrate 24 with the obtained nanocatalyst particles was rolled into a CVD furnace, the substrate 24 was flattened, and carbon materials such as carbon nanoparticles, single-walled carbon nanotubes, multi-walled carbon nanotubes, carbon nanotube arrays, and helical carbon nanotubes were synthesized by controlling the temperature 600-900℃ and the carbon source gas (alkane, alkyne, alkene, etc.).

[0045] The motion of the fluid inside the aerodynamic prism 2 was simulated using the FDM module of ANSYS Fluent. The lines shown in the figure represent the trajectories of the nanocatalyst particles. It can be seen that some of the nanocatalyst particles passing through the prism are bounced off or absorbed by the plate at the focusing aperture 14 (this is because the nanoparticles have different diameters, with larger diameter particles being more easily absorbed), thus achieving the effect of screening the nanoparticles. Figure 6 As shown, a small number of large-diameter nanoparticles are bounced / absorbed.

[0046] Therefore, the present invention employs the above-mentioned discrete catalyst screening and spraying system and method for carbon material growth, which utilizes an aerodynamic prism to achieve the screening and discrete spraying of nano-catalysts, and achieves the discrete distribution of nano-catalyst particles on the entire substrate through the motion system of the vacuum spraying chamber.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A discrete catalyst screening and spraying system for carbon material growth, characterized in that: It includes an aerodynamic prism, one end of which is equipped with an electric spark device, and the other end of which is connected to a vacuum spraying chamber. The vacuum spraying chamber is equipped with a motion system, which includes a substrate rolling unit and a substrate moving unit. The aerodynamic prism is sequentially equipped with a flow-limiting orifice, a first buffer chamber, a carrier gas inlet, a sheath gas inlet, a second buffer chamber, a focusing orifice, a third buffer chamber, and an accelerating nozzle. The accelerating nozzle is connected to the inside of the vacuum spraying chamber through a connection port and to the outside through a gas outlet.

2. The discrete catalyst screening and spraying system for carbon material growth according to claim 1, characterized in that: The electrical spark device is located at the end of the aerodynamic prism near the flow-limiting orifice.

3. The discrete catalyst screening and spraying system for carbon material growth according to claim 1, characterized in that: The aerodynamic prism has a connecting pipe, one end of which is connected to the outside through a sheath gas inlet, and the other end of which is an opening.

4. The discrete catalyst screening and spraying system for carbon material growth according to claim 3, characterized in that: The aerodynamic prism has a second connecting pipe inside the first connecting pipe. One end of the second connecting pipe is connected to the buffer chamber through several connecting pipes, and the other end of the second connecting pipe is open.

5. A discrete catalyst screening and spraying system for carbon material growth according to claim 4, characterized in that: The aerodynamic prism has a connecting pipe three inside it. The connecting pipe three is located inside the connecting pipe two. One end of the connecting pipe three is connected to the outside through the carrier gas inlet, and the other end of the connecting pipe three is an opening.

6. A discrete catalyst screening and spraying system for carbon material growth according to claim 1, characterized in that: The substrate rolling unit includes a stepper motor, the output shaft of which is connected to one end of a rotating roller for driving the substrate to roll up and down. The rotating roller is rotatably mounted on the top of the mounting frame, and a rotating roller is rotatably mounted on the bottom of the mounting frame. The substrate is mounted on the rotating roller and the rotating roller.

7. A discrete catalyst screening and spraying system for carbon material growth according to claim 6, characterized in that: The substrate moving unit includes a second stepper motor, the output shaft of which is connected to a rotating rod. The rotating rod is connected to a slider via a lead screw transmission structure. A moving frame is mounted on the slider and connected to a mounting frame.

8. A method of using a discrete catalyst screening spraying system for carbon material growth according to any one of claims 1-7, characterized in that: Includes the following steps: Step 1: The electrical discharge device generates nano-catalyst particles through high-voltage direct current electric spark discharge; Step 2: The nanocatalyst particles and the carrier gas form an aerosol, which reaches a laminar flow state in buffer chamber 1 after passing through the flow-limiting orifice. Step 3: Adjust the carrier gas flow rate through the carrier gas inlet. The carrier gas disperses the nano-catalyst particles coming out of the buffer chamber, so that the nano-catalyst particles can flow uniformly with the gas. Step 4: Sheath gas is introduced through the sheath gas inlet to restrict the lateral diffusion of the nano-catalyst particles. The airflow is controlled to keep the nano-catalyst particles away from the wall. The nano-catalyst particles pass through buffer chamber 2, focusing hole, buffer chamber 3, and finally enter the vacuum spraying chamber through the accelerating nozzle. The gas is extracted from the gas outlet by the vacuum pump. Step 5: The substrate rolling unit and the substrate moving unit make the substrate roll up and down and move left and right, so as to achieve the discrete distribution of nano-catalyst particles on the entire substrate.

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