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A switch-type carbon nanotube dispersant

A technology of carbon nanotubes and dispersants, applied in the field of switch-type carbon nanotube dispersants, to achieve the effect of excellent surface chemical properties

Active Publication Date: 2019-03-01
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, after conventional surfactants interact with carbon nanotubes, it is difficult to peel them off from the surface of carbon nanotubes. The present invention attempts to invent a switch-type carbon nanotube dispersant, which can disperse carbon nanotubes in water. , and when clean carbon nanotubes are needed, carbon nanotubes with clean surfaces can be obtained by feeding nitrogen or air or heating

Method used

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  • A switch-type carbon nanotube dispersant
  • A switch-type carbon nanotube dispersant
  • A switch-type carbon nanotube dispersant

Examples

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Effect test

Embodiment 1

[0018] Example 1: Deoxycholic acid reacted with 10 times molar equivalents of acetic anhydride at 65°C for 30 hours to obtain a hydroxyl-protected product; the hydroxyl-protected product was reacted with 2 molar equivalents of thionyl chloride in dichloromethane at room temperature After 24 hours, the organic solvent and thionyl chloride were removed after the reaction to obtain the acid chloride product, and the acid chloride product was reacted with N,N-dimethylethylenediamine in dichloromethane for 24 hours to obtain the amidation product. The amidated product was mixed with 2% NaOH (mass percentage), stirred at room temperature for 24 hours to obtain a hydroxyl deprotected product, and carbon dioxide was introduced into the aqueous solution of the hydroxyl deprotected product to obtain deoxycholic acid amidoethylenediamine bicarbonate.

Embodiment 2

[0019] Example 2: Deoxycholic acid and 10 times the molar equivalent of hexamethyldisilazane were reacted at 65°C for 30 hours to obtain a hydroxyl-protected product; the hydroxyl-protected product was mixed with 2 molar equivalents of oxalyl chloride in dichloromethane at room temperature Under reaction for 24 hours, remove the organic solvent and oxalyl chloride after the reaction is over to obtain the acid chloride product, react the acid chloride product with N,N-dimethylbutylene diamine in dichloromethane for 24 hours to obtain the amidation product, and The amidated product was mixed with 2% NaOH (mass percentage), stirred at room temperature for 24 hours to obtain a hydroxyl deprotected product, and carbon dioxide was introduced into the aqueous solution of the hydroxyl deprotected product to obtain deoxycholic acid amidobutylene diamine bicarbonate.

Embodiment 3

[0020] Example 3: Add 10 mg of multi-walled carbon nanotubes to 10 mL of 1% (mass percentage) dispersant deoxycholic acid amidoethylenediamine bicarbonate aqueous solution, and disperse with an ultrasonic disperser to obtain dispersed multi-walled carbon nanotubes Aqueous solution, when the aqueous solution is fed with nitrogen or heated, the dispersant decomposes to obtain an aqueous solution of agglomerated multi-walled carbon nanotubes; when the aqueous solution is fed with CO 2 And after ultrasonic dispersion, the dispersed multi-walled carbon nanotube aqueous solution is obtained again.

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Abstract

A switch-type carbon nanotube dispersant, the dispersant decomposes after passing through nitrogen, air or heating to generate amine compounds without surface activity, and the amine compounds are then passed through CO 2 After that, it becomes bicarbonate and becomes a cationic surfactant; the dispersant can disperse carbon nanotubes in an aqueous solution, and when carbon nanotubes need to be cleaned, the surfactant decomposes after nitrogen, air or heating, The undispersed carbon nanotubes with a clean surface are obtained, and after passing through carbon dioxide, a surfactant can be re-formed and the carbon nanotubes can be dispersed.

Description

technical field [0001] The invention relates to a switch-type carbon nanotube dispersant, which belongs to the technical field of colloid and interface chemistry. Background technique [0002] Carbon nanotubes have attracted more and more attention because of their unique structure and superior electrical, optical, chemical and thermodynamic properties. However, due to the relatively strong van der Waals force between carbon nanotubes, it is easy to entangle or agglomerate into bundles, which seriously restricts the application of carbon nanotubes. How to improve the dispersion of carbon nanotubes has become an urgent problem to be solved. At present, physical method and chemical functionalization method are commonly used methods for dispersing carbon nanotubes. The physical method is to effectively disperse carbon nanotubes through high-energy ultrasound and ultracentrifugation. In this method, high-energy ultrasound will break carbon nanotubes, shorten their length, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/174C07J41/00B01F17/22B01F17/16C09K23/16C09K23/22
CPCC07J41/0033C09K23/00Y02P20/141
Inventor 蒋建中张杜炎
Owner JIANGNAN UNIV
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