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Method for preparing micro/nanoscale carbon capsules

A micro-nano-scale, capsule technology, applied in the field of preparation of micro-nano-scale carbon capsules, can solve problems such as high cost, difficult control of carbon capsule particle size and capsule wall thickness, complex arc discharge process, etc., to achieve particle size uniform effect

Inactive Publication Date: 2014-02-05
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Among the above preparation methods, the mechanical ball milling method and the chemical bonding method are difficult to realize the control of the particle size of the carbon capsule and the regulation of the capsule wall thickness; the arc discharge method is complicated in process and high in cost.

Method used

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  • Method for preparing micro/nanoscale carbon capsules
  • Method for preparing micro/nanoscale carbon capsules
  • Method for preparing micro/nanoscale carbon capsules

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Take 50 mg micron-sized four-acicular ZnO particles and evenly disperse them on the quartz boat, the bottom area of ​​the quartz boat is 5cm 2 Place the quartz boat that is dispersed with four needle-shaped ZnO particles in the middle of the quartz tube in the horizontal heating furnace, check the airtightness and fill with argon gas at 100ml / min for 30 minutes, and discharge the air; Slowly raise the temperature to 600°C at 2-3°C / min, stop filling with argon after 30 minutes of constant temperature; pass acetylene gas into the quartz tube at 30ml / min, keep the temperature, stop feeding acetylene after reacting for 60 minutes; then introduce argon gas to terminate the reaction, keep filling with argon and cool to room temperature with the furnace, and take out the obtained metal oxide / carbon layer composite.

[0022] The microscopic morphology of metal oxide / carbon layer composites is as follows: figure 1 shown. in, figure 1 (a) is the overall picture, from figure 1...

Embodiment 2

[0024] Take 20mg of nanoscale quasi-spherical ZnO particles and evenly disperse them on the quartz boat, the area of ​​the bottom of the quartz boat is 5cm 2 ; The quartz boat dispersed with nanoscale quasi-spherical ZnO particles is placed in the middle of the quartz tube in the horizontal heating furnace, checks the airtightness and fills with nitrogen gas at 30ml / min for 40 minutes, and the air is discharged; the horizontal heating furnace Slowly raise the temperature to 800°C at 1-3°C / min, stop feeding nitrogen after 50 minutes of constant temperature; pass acetylene gas into the quartz tube at 20ml / min, keep the temperature, stop feeding acetylene after reacting for 10 minutes; then introduce nitrogen Terminate the reaction, keep filling with nitrogen and cool to room temperature with the furnace, and take out the obtained metal oxide / carbon layer composite material.

[0025] The metal oxide / carbon layer composite material was washed with HCl solution with a concentration...

Embodiment 3

[0027] Take 5mg of nanoscale rod-shaped ZnO particles and evenly disperse them on the quartz boat, the area of ​​the bottom of the quartz boat is 5cm 2 Place the quartz boat dispersed with nanoscale rod-shaped ZnO particles in the middle of the quartz tube in the horizontal heating furnace, check the airtightness and fill with argon for 45 minutes at 40ml / min, and discharge the air;

[0028] Slowly raise the temperature of the horizontal heating furnace to 400°C at 1-2°C / min, stop filling nitrogen after 60 minutes of constant temperature, pass acetylene gas into the quartz tube at 20ml / min, keep the temperature, stop feeding after 20 minutes of reaction Acetylene; then introduce nitrogen to terminate the reaction, keep filling with nitrogen and cool to room temperature with the furnace, and take out the obtained metal oxide / carbon layer composite. Its microscopic appearance is as image 3 shown. in, image 3 (a) is a low-magnification image, from image 3 The visible produ...

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Abstract

The invention provides a method for preparing micro / nanoscale carbon capsules. The method comprises the steps of: with acetylene gas as a reactant, growing carbon nanolayers on the surfaces of metallic oxide particles in situ, so as to regulate the flow rate, reaction time and reaction temperature of acetylene gas to influence the speed rate of the catalytic reaction, thus obtaining micro / nanoscale carbon capsules with different wall thicknesses. Compared with a mechanical milling method and a chemical bond connection method which can be used for preparing carbon capsules with the uncontrollable particle sizes, the method provided by the invention can prepare carbon capsules by using metallic oxide particles with different particle sizes and shapes as required, thus obtaining micro / nanoscale carbon capsules with uniform particle sizes.

Description

technical field [0001] The invention belongs to the technical field of carbon capsules, and more specifically relates to a method for preparing micro-nano scale carbon capsules. Background technique [0002] Since Ruoff and Tomita (1993) reported nanoscale carbon-encapsulated lanthanum carbide particles, nanoscale carbon capsules have attracted extensive attention from scholars related to carbon materials. This is because nano-scale carbon capsules can be used to load nanoparticles of metal or metal carbide crystals. This material has great potential in the fields of magnetic recording, lithium-ion batteries, electric wave shielding, redox catalysts, nuclear waste treatment, fine ceramics and antibacterial. Broad application prospects [Huo Junping, et al. Carbon Technology, 2006,3(25):22-27]. [0003] The sizes of carbon capsules reported so far are mostly on the order of nanometers. Nano-scale carbon capsule related patent reports such as: Chinese invention patent with th...

Claims

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Application Information

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IPC IPC(8): C01B31/02B82Y40/00B82Y30/00C01B32/05C01B32/15
Inventor 王超简贤唐辉曾青
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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