Device for efficiently preparing silicon-coated carbon nanotubes

Abstract

The utility model belongs to the technical field of carbon nano tube surface treatment, and particularly relates to a device for efficiently preparing a silicon-coated carbon nano tube. Comprising a vacuum deposition box, a first ventilation pipe installed on one side of the vacuum deposition box, a second ventilation pipe installed on the other side of the vacuum deposition box, a carbon nano tube discharging pipe and a liquid silicon discharging pipe, and the carbon nano tube discharging pipe and the liquid silicon discharging pipe are installed on the top of the vacuum deposition box. An outlet of the carbon nanotube discharging pipe is located above an outlet of the first ventilation pipe, a preset included angle is formed between the airflow output direction of the first ventilation pipe and the carbon nanotube discharging direction of the carbon nanotube discharging pipe, and an outlet of the liquid silicon discharging pipe is located above an outlet of the second ventilation pipe; and a preset included angle is formed between the airflow output direction of the second breather pipe and the liquid silicon blanking direction of the liquid silicon blanking pipe. According to the utility model, silicon is uniformly coated on the surface of the carbon nano tube through atomization deposition, the process is simple, and continuous batch production can be carried out.

Description

Technical Field

[0001] This utility model relates to the field of carbon nanotube surface treatment technology, specifically to an apparatus for efficiently preparing silicon-coated carbon nanotubes. Background Technology

[0002] Carbon nanotubes, as typical one-dimensional nanomaterials, possess unique mechanical, thermal, electrical, and optical properties due to their extremely high aspect ratio and specific surface area. Silica (SiO2), on the other hand, exhibits excellent properties such as hygroscopicity, extinction, thermal insulation, electrical insulation, and superior mechanical properties due to the varying strengths of hydrogen bonds formed between its surface silanol groups and active silane bonds. Utilizing the superior properties of carbon nanotubes, combined with the insulating properties of SiO2 and its strong bonding with polymers, researchers have already prepared SiO2-coated carbon nanotube composites. These composites exhibit reduced electrical conductivity due to the insulating SiO2 layer on the surface, and the abundance of hydroxyl groups on the SiO2 surface facilitates bonding with polymers, enhancing the adhesion. Therefore, SiO2-coated carbon nanotube composites have broad application value.

[0003] Existing technology proposes a silica-coated carbon nanotube and its preparation apparatus, method, and application. The preparation apparatus includes a plasma treatment device and a chemical reaction device, both sharing a cyclone sample chamber. The preparation method includes the following steps: First, carbon nanotubes are loosely loaded into the cyclone sample chamber, occupying 1 / 3 to 2 / 3 of the chamber volume. The plasma treatment device is then assembled to perform plasma activation treatment on the carbon nanotubes. Next, the plasma generator is removed, the furnace head is replaced, and the chemical reaction device is assembled to perform surface coating treatment on the carbon nanotubes. Tetraethyl orthosilicate decomposes into amorphous silica, which is uniformly deposited on the surface of the carbon nanotubes. This apparatus has a complex structure, high maintenance costs, and is unsuitable for industrial production. Existing technology also proposes a silica... The preparation method of coated carbon nanotubes includes the following steps: carbon nanotubes, surfactant, anhydrous ethanol, and deionized water are mixed in a mass ratio of 1:0.5–2:70–90:10–30, and the pH is adjusted to 8–9.5 to obtain a first mixture; tetraalkoxysilane and anhydrous ethanol are mixed in a mass ratio of 1:10–30, and then added dropwise to the first mixture at 25°C–60°C, and the mixture is stirred to react fully to obtain a second mixture; a silane coupling agent is added dropwise to the second mixture, and the mixture is stirred to react fully. After separation and purification, the silica-coated carbon nanotubes are obtained. This method and apparatus use a chemical method for preparation, which requires cumbersome steps such as filtration and cannot achieve large-scale preparation. Summary of the Invention

[0004] The purpose of this invention is to address the problem that existing devices for preparing SiO2-coated carbon nanotube composite materials have complex structures, making industrial production impossible. Therefore, this invention proposes a highly efficient device for preparing silicon-coated carbon nanotubes. This device has opposing air vents on both sides of a vacuum deposition chamber. A carbon nanotube feeding pipe and a liquid silicon feeding pipe are installed on the top of the chamber. The feeding directions of the carbon nanotubes and liquid silicon in the feeding pipes are at angles to the airflow output direction of the opposing air vents. In operation, the opposing air vents are opened, and the airflow propels the carbon nanotubes and liquid silicon together, rapidly depositing silicon onto the surface of the carbon nanotubes. This invention achieves uniform silicon coating on the carbon nanotube surface through atomized deposition. The process is simple, and continuous feeding within the chamber allows for continuous production and mass production.

[0005] This invention proposes an efficient apparatus for preparing silicon-coated carbon nanotubes. It includes a vacuum deposition chamber, a first vent pipe installed on one side of the vacuum deposition chamber, a second vent pipe installed on the other side of the vacuum deposition chamber, a carbon nanotube feeding pipe installed on the top of the vacuum deposition chamber, and a liquid silicon feeding pipe. The outlets of the first and second vent pipes are arranged opposite each other. The outlet of the carbon nanotube feeding pipe is located above the outlet of the first vent pipe, and the airflow output direction of the first vent pipe forms a preset angle with the carbon nanotube feeding direction of the carbon nanotube feeding pipe. The outlet of the liquid silicon feeding pipe is located above the outlet of the second vent pipe, and the airflow output direction of the second vent pipe forms a preset angle with the liquid silicon feeding direction of the liquid silicon feeding pipe.

[0006] Preferably, both the first vent pipe and the second vent pipe are equipped with air valves.

[0007] Preferably, the inlet of the carbon nanotube feeding pipe is used to connect to the carbon nanotube storage tank, and the inlet of the liquid silicon feeding pipe is used to connect to the liquid silicon storage tank; a first check valve is provided at the connection between the carbon nanotube feeding pipe and the carbon nanotube storage tank, and a second check valve is provided at the connection between the liquid silicon feeding pipe and the liquid silicon storage tank.

[0008] Preferably, the angle between the airflow output direction of the first vent pipe and the carbon nanotube feeding direction of the carbon nanotube feeding pipe is equal to the angle between the airflow output direction of the second vent pipe and the liquid silicon feeding direction of the liquid silicon feeding pipe.

[0009] Preferably, the angle between the airflow output direction of the first vent pipe and the carbon nanotube feeding direction of the carbon nanotube feeding pipe is 90 degrees, and the angle between the airflow output direction of the second vent pipe and the liquid silicon feeding direction of the liquid silicon feeding pipe is 90 degrees.

[0010] Preferably, the upper side of the airflow outlet of the first vent pipe is in contact with the left side of the carbon nanotube feeding port of the carbon nanotube feeding pipe.

[0011] Preferably, the upper side of the airflow outlet of the second vent pipe is in contact with the right side of the liquid silicon discharge port of the liquid silicon discharge pipe.

[0012] Preferably, the vacuum deposition chamber is provided with a material inlet at the bottom.

[0013] Preferably, silicon carbide rods are embedded in both sides of the liquid silicon storage tank.

[0014] Preferably, the side wall of the vacuum deposition chamber is provided with an observation tube, which is located above the first or second vent pipe.

[0015] The apparatus for efficiently preparing silicon-coated carbon nanotubes according to this invention has at least the following beneficial effects:

[0016] (1) In this utility model, ventilation pipes with opposing openings are respectively set on the two side walls of the vacuum deposition box, and carbon nanotube feeding pipe and liquid silicon feeding pipe are respectively installed on the top of the vacuum deposition box. The carbon nanotube feeding direction of the carbon nanotube feeding pipe and the liquid silicon feeding direction of the liquid silicon feeding pipe are respectively at a certain angle to the airflow output direction of the opposing ventilation pipe. Air is vented into the ventilation pipe, and the carbon nanotubes and liquid silicon are sprayed against each other by the opposing airflow. Through atomization deposition, the purpose of rapidly depositing silicon on the surface of carbon nanotubes is achieved, and a precursor with silicon coating on the surface of carbon nanotubes is obtained.

[0017] (2) The device described in this utility model has a simple structure, and the process of preparing the precursor for silicon-coated carbon nanotubes is also relatively simple. Continuous production can be achieved by continuously feeding materials into the barrel, and mass production is possible.

[0018] (3) In practical applications, the precursors of silicon-coated carbon nanotubes prepared by the device described in this utility model are finally added to high-temperature aluminum liquid. Through stirring and casting, carbon nanotube-modified aluminum-based composite materials are obtained, which increases the wettability of carbon nanotubes and aluminum, thus providing a strong foundation for the preparation of carbon nanotube-modified aluminum alloy materials. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a device for efficiently preparing silicon-coated carbon nanotubes according to the present invention.

[0020] Explanation of reference numerals in the attached figures

[0021] 1. Vacuum deposition chamber; 2. First vent pipe; 3. Second vent pipe; 4. Carbon nanotube feed pipe; 5. Liquid silicon feed pipe; 6. Gas valve; 7. Carbon nanotube storage tank; 8. Liquid silicon storage tank; 9. Check valve; 10. Feed port; 11. Observation tube. Detailed Implementation

[0022] The following is a detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0023] This invention proposes a highly efficient apparatus for preparing silicon-coated carbon nanotubes, such as... Figure 1 As shown, it includes a vacuum deposition chamber 1, a first vent pipe 2 installed on one side of the vacuum deposition chamber 1, a second vent pipe 3 installed on the other side of the vacuum deposition chamber 1, a carbon nanotube feeding pipe 4 and a liquid silicon feeding pipe 5 installed on the top of the vacuum deposition chamber 1. The outlets of the first vent pipe 2 and the second vent pipe 3 are arranged opposite to each other. The outlet of the carbon nanotube feeding pipe 4 is located above the outlet of the first vent pipe 2, and the airflow output direction of the first vent pipe 2 has a preset angle with the carbon nanotube feeding direction of the carbon nanotube feeding pipe 4. The outlet of the liquid silicon feeding pipe 5 is located above the outlet of the second vent pipe 3, and the airflow output direction of the second vent pipe 3 has a preset angle with the liquid silicon feeding direction of the liquid silicon feeding pipe 5.

[0024] In the apparatus for the efficient preparation of silicon-coated carbon nanotubes described in this invention, in a specific embodiment, the vacuum deposition chamber 1 is made of a nickel-based high-temperature alloy with a wall thickness of 5-10 mm. Its advantages include high-temperature resistance, ensuring that the apparatus is not damaged by liquid silicon. In this paper, the vacuum deposition chamber 1 is a self-made non-standard component, its function being to provide a stable vacuum environment for the deposition of liquid silicon onto the surface of the carbon nanotubes (if not in a vacuum, oxides such as SiO2 will be generated, which are not the target material of this experiment).

[0025] In the device for efficiently preparing silicon-coated carbon nanotubes according to the present invention, in a specific embodiment, the outlets of the first vent pipe 2 and the second vent pipe 3 are coaxially arranged.

[0026] In the apparatus for efficiently preparing silicon-coated carbon nanotubes described in this utility model, in a specific embodiment, the connection between the first vent pipe 2 and the second vent pipe 3 is sealed to ensure the vacuum level of the vacuum deposition chamber.

[0027] In the apparatus for efficiently preparing silicon-coated carbon nanotubes according to this utility model, in a specific embodiment, the inlet of the carbon nanotube feeding pipe 4 is used to connect to the carbon nanotube storage tank 7, and the inlet of the liquid silicon feeding pipe 5 is used to connect to the liquid silicon storage tank 8. The connection between the carbon nanotube feeding pipe 4 and the carbon nanotube storage tank 7, as well as the connection between the liquid silicon feeding pipe 5 and the liquid silicon storage tank 8, are all sealed to ensure the vacuum degree of the vacuum deposition chamber. A check valve 9 is provided at the connection between the carbon nanotube feeding pipe 4 and the carbon nanotube storage tank 7, and a check valve 9 is provided at the connection between the liquid silicon feeding pipe 5 and the liquid silicon storage tank 8.

[0028] In the apparatus for efficiently preparing silicon-coated carbon nanotubes according to this invention, in a specific embodiment, both the carbon nanotube storage tank 7 and the liquid silicon storage tank 8 are made of corundum, which has the advantage of a melting point of 2050℃, much higher than the melting point of silicon (1414℃), ensuring complete melting of silicon. Specifically, the carbon nanotube storage tank 7 is a self-made non-standard component, and its function is to hold the carbon nanotubes to be sprayed; the liquid silicon storage tank 8 is a self-made non-standard component, and its function is to hold the liquid silicon to be sprayed.

[0029] In the apparatus for efficiently preparing silicon-coated carbon nanotubes described in this utility model, in a specific embodiment, such as... Figure 1 As shown, both the first vent pipe 2 and the second vent pipe 3 are equipped with air valves 6.

[0030] In the device for efficiently preparing silicon-coated carbon nanotubes according to this utility model, in a specific embodiment, the angle between the airflow output direction of the first vent pipe 2 and the carbon nanotube feeding direction of the carbon nanotube feeding pipe 4 is equal to the angle between the airflow output direction of the second vent pipe 3 and the liquid silicon feeding direction of the liquid silicon feeding pipe 5.

[0031] In the apparatus for efficiently preparing silicon-coated carbon nanotubes described in this utility model, in a specific embodiment, such as... Figure 1 As shown, the angle between the airflow output direction of the first vent pipe 2 and the carbon nanotube feeding direction of the carbon nanotube feeding pipe 4 is 90 degrees, and the angle between the airflow output direction of the second vent pipe 3 and the liquid silicon feeding direction of the liquid silicon feeding pipe 5 is 90 degrees.

[0032] In the apparatus for efficiently preparing silicon-coated carbon nanotubes described in this utility model, in a specific embodiment, such as... Figure 1 As shown, the upper side of the airflow outlet of the first vent pipe 2 is in contact with the left side of the carbon nanotube feeding port of the carbon nanotube feeding pipe 4.

[0033] In the apparatus for efficiently preparing silicon-coated carbon nanotubes described in this utility model, in a specific embodiment, such as... Figure 1As shown, the upper side of the airflow outlet of the second vent pipe 3 is in contact with the right side of the liquid silicon discharge port of the liquid silicon discharge pipe 5.

[0034] In the apparatus for efficiently preparing silicon-coated carbon nanotubes according to the present invention, in a specific embodiment, the bottom of the vacuum deposition chamber 1 is provided with a material inlet 10, specifically, the material inlet 10 is a cover with a sealing ring.

[0035] In the device for efficiently preparing silicon-coated carbon nanotubes according to the present invention, in a specific embodiment, silicon carbide rods are embedded in both side walls of the liquid silicon storage tank 8. The silicon carbide rods are used to heat the tank body of the liquid silicon storage tank 8 to obtain molten liquid silicon.

[0036] In the apparatus for efficiently preparing silicon-coated carbon nanotubes according to this utility model, in a specific embodiment, an observation tube 11 is provided on the side wall of the vacuum deposition chamber 1. The observation tube 11 is located above the first vent pipe 2 or the second vent pipe 3. The function of the observation tube 11 is to observe the deposition state of liquid silicon and carbon nanotubes in the vacuum deposition chamber. There is no limitation on the angle between the observation tube 11 and the first vent pipe 2 or the second vent pipe 3, as long as the deposition state of liquid silicon and carbon nanotubes can be clearly seen. In this paper, the angle between the observation tube 11 and the second vent pipe 3 is 45 degrees.

[0037] During the specific operation, ensure that the vacuum deposition chamber 1 is in a vacuum state and the temperature is higher than 1230℃. At the same time, open the gas valve 6 and the check valve 9. The carbon nanotubes stored in the carbon nanotube storage tank 7 and the liquid silicon stored in the liquid silicon storage tank 8 are respectively discharged downward from the carbon nanotube discharge pipe 4 and the liquid silicon discharge pipe 5 and reach the openings of the first vent pipe 2 and the second vent pipe 3. Through the action of airflow, the carbon nanotubes and liquid silicon are sprayed against each other, and the silicon is uniformly coated on the surface of the carbon nanotubes, finally obtaining carbon nanotube powder with a layer of elemental silicon on the surface.

[0038] The preferred embodiments of this utility model have been described in detail above; however, this utility model is not limited thereto. Within the scope of the technical concept of this utility model, various simple modifications can be made to the technical solution of this utility model, including combining the various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed by this utility model and are all within the protection scope of this utility model.

Claims

1. An apparatus for efficiently preparing silicon-coated carbon nanotubes, characterized in that, It includes a vacuum deposition chamber (1), a first vent pipe (2) installed on one side of the vacuum deposition chamber (1), a second vent pipe (3) installed on the other side of the vacuum deposition chamber (1), a carbon nanotube feeding pipe (4) and a liquid silicon feeding pipe (5) installed on the top of the vacuum deposition chamber (1), wherein the outlets of the first vent pipe (2) and the second vent pipe (3) are arranged opposite to each other, the outlet of the carbon nanotube feeding pipe (4) is located above the outlet of the first vent pipe (2), and the airflow output direction of the first vent pipe (2) has a preset angle with the carbon nanotube feeding direction of the carbon nanotube feeding pipe (4), the outlet of the liquid silicon feeding pipe (5) is located above the outlet of the second vent pipe (3), and the airflow output direction of the second vent pipe (3) has a preset angle with the liquid silicon feeding direction of the liquid silicon feeding pipe (5).

2. The apparatus for efficiently preparing silicon-coated carbon nanotubes according to claim 1, characterized in that, Both the first vent pipe (2) and the second vent pipe (3) are equipped with air valves (6).

3. The apparatus for efficiently preparing silicon-coated carbon nanotubes according to claim 1, characterized in that, The inlet of the carbon nanotube feeding pipe (4) is used to connect to the carbon nanotube storage tank (7), and the inlet of the liquid silicon feeding pipe (5) is used to connect to the liquid silicon storage tank (8). A stop valve (9) is provided at the connection between the carbon nanotube feeding pipe (4) and the carbon nanotube storage tank (7), and a stop valve (9) is provided at the connection between the liquid silicon feeding pipe (5) and the liquid silicon storage tank (8).

4. The apparatus for efficiently preparing silicon-coated carbon nanotubes according to claim 1, characterized in that, The angle between the airflow output direction of the first vent pipe (2) and the carbon nanotube feeding direction of the carbon nanotube feeding pipe (4) is equal to the angle between the airflow output direction of the second vent pipe (3) and the liquid silicon feeding direction of the liquid silicon feeding pipe (5).

5. The apparatus for efficiently preparing silicon-coated carbon nanotubes according to claim 1, characterized in that, The angle between the airflow output direction of the first vent pipe (2) and the carbon nanotube feeding direction of the carbon nanotube feeding pipe (4) is 90 degrees, and the angle between the airflow output direction of the second vent pipe (3) and the liquid silicon feeding direction of the liquid silicon feeding pipe (5) is 90 degrees.

6. The apparatus for efficiently preparing silicon-coated carbon nanotubes according to claim 1, characterized in that, The upper side of the airflow outlet of the first vent pipe (2) contacts the left side of the carbon nanotube discharge port of the carbon nanotube discharge pipe (4).

7. The apparatus for efficiently preparing silicon-coated carbon nanotubes according to claim 1 or 6, characterized in that, The upper side of the airflow outlet of the second vent pipe (3) is in contact with the right side of the liquid silicon discharge port of the liquid silicon discharge pipe (5).

8. The apparatus for efficiently preparing silicon-coated carbon nanotubes according to claim 1, characterized in that, The vacuum deposition chamber (1) is provided with a material inlet (10) at the bottom.

9. The apparatus for efficiently preparing silicon-coated carbon nanotubes according to claim 3, characterized in that, Silicon carbide rods are embedded in both sides of the liquid silicon storage tank (8).

10. The apparatus for efficiently preparing silicon-coated carbon nanotubes according to claim 1, characterized in that, The side wall of the vacuum deposition chamber (1) is provided with an observation tube (11), which is located above the first vent pipe (2) or the second vent pipe (3).

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