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A solvent selection method for preparing carbon materials

A carbon material and solvent technology, which is applied in the field of solvent selection for the preparation of carbon materials, can solve the problems of inability to quickly and accurately select high-quality solvents and less solvents, and achieve the effect of unique shape, simple method and high specific surface area

Active Publication Date: 2022-06-21
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, so far, the above using |δ T |T |<1, or used alone (RED<1) cannot quickly and accurately select the high-quality solvent required for the preparation of carbon materials

Method used

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  • A solvent selection method for preparing carbon materials
  • A solvent selection method for preparing carbon materials
  • A solvent selection method for preparing carbon materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Choice of one-component solvent systems:

[0042] First, the Hansen solubility parameter of the polyimide precursor was determined. Take 12 parts of polyimide of equal mass (0.1 g per part) and uniformly disperse them in 12 parts (10 ml per part) of different solvents by ultrasonic wave respectively to obtain 12 kinds of dispersion liquids. Solvents include N,N-dimethylformamide, N-methylpyrrolidone, dimethylsulfoxide, acetonitrile, ethanol, isopropanol, mesitylene, methanol, dioxane, n-hexane, dichloroethane and in the tetrahydrofuran system (the δ of the 12 one-component solvents used T,溶剂 ,δ D,溶剂 ,δ P,溶剂 and δ H,溶剂 value, which can be obtained from a look-up table in the Hansen Solubility Parameters: A User's Handbook). Subsequently, 12 parts of the dispersion were centrifuged, and 12 parts of the supernatant were collected as samples to be tested. The maximum absorbance (A) of 12 solutions at a wavelength of 200 nm was tested respectively by ultraviolet absorp...

Embodiment 2

[0057] Two-component solvent system: first based on formula Five candidate two-component solvents were calculated (mesitylene / N,N-dimethylformamide, dioxane / N,N-dimethylformamide, methanol / N-methylpyrrolidone, isopropanol / Hansen solubility parameter (δ) of acetonitrile, N-methylpyrrolidone / dimethyl sulfoxide) T,混合溶剂 ,δ D,混合溶剂 ,δ P,混合溶剂 and δ H,混合溶剂 value), and the calculation results are shown in Table 2.

[0058] Table 2 Compatibility analysis between different candidate two-component solvent systems and polyimide

[0059]

[0060]

[0061] The specific calculation process takes mesitylene / N,N-dimethylformamide mixed solvent as an example. When mesitylene:N,N-dimethylformamide=50:50, mesitylene / N,N- Dimethylformamide mixed solvent:

[0062]

[0063]

[0064]

[0065]

[0066] According to the Hansen solubility parameter of polyimide determined in Example 1:

[0067] δ T，聚酰亚胺 =24.2(Mpa) 0.5 ,

[0068] δ D，聚酰亚胺 =17.3(Mpa) 0.5 ,

[0069] δ P，聚酰亚...

Embodiment 3

[0080] Multicomponent solvent systems: first based on the formula Calculate 5 candidate 3-component solvents (mesitylene / N-methylpyrrolidone / dimethylsulfoxide, N-methylpyrrolidone / N,N-dimethylformamide / dimethylsulfoxide, dioxane Cyclo / N,N-dimethylformamide / methanol, mesitylene / N-methylpyrrolidone / N,N-dimethylformamide, N-methylpyrrolidone / dimethylsulfoxide / methanol) Sen solubility parameter (δ T,混合溶剂 ,δ D,混合溶剂 ,δ P,混合溶剂 and δ H,混合溶剂 value), and the calculation results are shown in Table 3.

[0081] Table 3 Compatibility analysis between different candidate three-component solvent systems and polyimide.

[0082]

[0083]

[0084] The specific calculation process takes mesitylene / N-methylpyrrolidone / dimethyl sulfoxide mixed solvent as an example. When mesitylene:N-methylpyrrolidone:dimethylsulfoxide=1:2:7:

[0085]

[0086]

[0087]

[0088]

[0089] According to the Hansen solubility parameter of the polyimide precursor determined in Example 1:

[0090...

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Abstract

The invention relates to a solvent selection method for preparing carbon materials. It belongs to the field of material preparation science and technology. Using the total Hansen solubility parameter difference between solvent and carbon precursor (|δ T |) and the relative energy difference (RED) two parameters combined method, and according to |δ T The solvent selection criteria of |<1 and RED<1 can systematically screen out "excellent" solvents for carbon material synthesis from a large number of potential candidate solvents quickly and accurately. This method is also applicable to binary and multi-component solvent systems, that is, a series of "good" solvents can also be obtained by mixing different "non-good" solvents. The method of the invention is simple, and provides effective guidance on how to select a suitable solvent for the preparation of carbon materials. Moreover, the carbon material synthesized with the solvent selected in the present invention has the effect of optimizing the structure, especially the prepared carbon material has a unique appearance and a high specific surface area, and is suitable for use in the fields of adsorption, catalysis, biomedicine, energy storage and conversion, etc. It has important application prospects.

Description

technical field [0001] The invention relates to a solvent selection method for preparing carbon materials, and belongs to the technical field of material preparation. Background technique [0002] Carbon materials have the advantages of environmental friendliness, stable chemical properties and good electrical conductivity, and have a wide range of applications in energy storage, adsorption, catalysis and other fields. Carbon materials are obtained by carbonizing carbon precursors at high temperature. Therefore, the structure (morphology, microstructure, etc.) of carbon precursors directly affects the properties (morphology, surface area) of carbon materials. Organic liquid-phase chemical synthesis methods have been widely used to prepare various carbon materials, and compared with chemical vapor or solid-phase methods, organic liquid-phase chemical synthesis methods endow carbon materials with extensive tunability in morphology, pore structure, and function. Practice has s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/05
CPCC01B32/05
Inventor 刘明贤宋子洋甘礼华
Owner TONGJI UNIV
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