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One-step synthesis method for hollow carbon case

A hollow and carbonization technology, which is applied in the field of one-step synthesis of hollow carbon shells, can solve the problems of complex post-processing procedures, uneven particle size, and many surface defects, and achieve uniform and controllable particle size, high technical added value, and stable performance. Effect

Inactive Publication Date: 2008-12-03
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the disadvantages are that the formula and process conditions are not easy to adjust, and the post-treatment process is complicated, resulting in a decrease in product purity and an increase in cost.
[0006] Obviously, the above methods have complex processes, low yield, uneven particle size, poor sphericity (more surface defects, not smooth), impurities in the material, high material cost, and difficulty in large-scale preparation.

Method used

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  • One-step synthesis method for hollow carbon case
  • One-step synthesis method for hollow carbon case
  • One-step synthesis method for hollow carbon case

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Weigh 1.40g of dihydroxybenzoic acid and 0.48g of lysine into a 500ml round bottom flask, add 250ml of absolute ethanol, stir, and after the lysine and dihydroxybenzoic acid are completely dissolved, add 1.48g of 37% formaldehyde solution , stirred and refluxed in a water bath at 80°C for three days. After the reaction is completed, the reactant is filtered, washed with ethanol or water, and the collected product is dried at 50°C. The scanning electron micrographs of the obtained polymer micro-nanospheres are as follows: figure 1 shown. Put a part of the dried polymer into a carbonization furnace. The carbonization procedure is as follows: from room temperature to 150°C at a rate of 5°C / min, and keep the temperature constant for 30 minutes; After 120 minutes, a black powdery polymer, that is, a hollow sphere product, was obtained. The transmission electron micrograph of the product is shown in figure 2 As shown, it shows that the obtained product is a hollow carbon...

Embodiment 2

[0025] The operation method is the same as in Example 1, except that the solvent is replaced with 250ml methanol. The obtained carbonized product has an average diameter of 2.5 μm and a BET specific surface area of ​​584m 2 / g of uniformly distributed hollow carbon spheres.

Embodiment 3

[0027] The operating method is the same as in Example 1, except that the solvent is replaced with 250ml of isopropanol. The obtained carbonized product has an average diameter of 1 μm and a specific surface area of ​​322m 2 / g of uniformly distributed hollow carbon spheres.

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Abstract

The invention relates to a method for synthesizing a micro-nanometer level hollow polymer ball, a carbon ball and a graphitized ball by one step. The method comprises the following steps that: hydroxybenzene and aldehyde are used as raw materials; lysine is used as a catalyst; fatty alcohol is used as a solvent; a polymer hollow ball with an even dimension can be produced by polymerization at a temperature of 80 DEG C; and the polymer hollow ball is further charred to produce a hollow carbon ball. If Fe<3+> is introduced into the polymer hollow ball, the polymer hollow ball is charred to produce a graphitized hollow ball. Through changing a molar ratio of the hydroxybenzene and aldehyde, the catalyst amount and the type of the solvent, the hollow carbon ball with a grain diameter of between 0.6 and 2 mu m can be produced. The micro-nanometer level hollow carbon ball has an even and controllable grain diameter, high purity, smooth surface, stable performance and high technical added value, is suitable for a load type magnetic separation catalyst, an absorption separating agent of pigment and organic molecule and a separating agent of protein and salt and is used as an electrode material of a super capacitor with high power density and high energy density.

Description

technical field [0001] The present invention relates to the fields of adsorption, separation, and catalysis new materials, electric adsorption devices, capacitors, and electrode materials for fuel cells, and also belongs to the technical field of preparing micro-nano-level hollow carbon (graphitization) spheres by phenolic polycondensation, especially the one-step synthesis of hollow carbon (graphitization) spheres. Charcoal method. Background technique [0002] Nanoparticles have distinct characteristics from bulk materials and exhibit unique properties in many applications. However, sometimes due to the single particle structure or composition, it cannot meet the requirements of complex applications. Constructing core-shell structure particles or hollow microspheres can be applied in fields such as lightweight fillers, low dielectric constant materials, controllable transport and release, disease diagnosis, biomass separation, and nano-micro containers. Core-shell nanopa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02
Inventor 陆安慧农谷珍钱华光
Owner DALIAN UNIV OF TECH
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