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Preparation method of ionic-type amphiphilic functionalized graphene

A sexually functional and ionic technology, applied in the field of preparation of functionalized graphene, can solve the problems of reduced electrical conductivity, thermal conductivity and mechanical properties of graphene, reduced structural integrity of graphene nanosheets, etc., and achieves excellent dispersion stability. and amphipathic effects

Inactive Publication Date: 2016-07-06
HENAN UNIVERSITY OF TECHNOLOGY +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Normally, the functionalization of graphene will change the hybrid structure of carbon atoms on the surface of graphene, from sp2 hybridization to sp3 hybridization, and reduce the integrity of the graphene nanosheet structure, resulting in the conductivity of graphene , thermal conductivity and mechanical properties are reduced

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  • Preparation method of ionic-type amphiphilic functionalized graphene
  • Preparation method of ionic-type amphiphilic functionalized graphene

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preparation example Construction

[0017] The preparation method of the ionic amphiphilic functionalized graphene of the present invention comprises the steps of preparation of graphene oxide, silanization treatment, reduction of silylated graphene oxide, ion exchange and the like.

[0018] Wherein, the preparation of described graphene oxide adopts improved Hummers method, uses strong acid concentrated sulfuric acid, potassium permanganate (KMnO 4 ) and strong oxidizing agent - hydrogen peroxide (H 2 o 2 ) Oxidize the expanded graphite, so that the surface of the graphite sheet contains oxygen-containing groups such as hydroxyl, epoxy, and carboxyl due to oxidation.

[0019] Among them, the silanization treatment is to use the highly active ionic structure silane coupling agent and the graphene oxide to form Si-O-C bonds between the hydroxyl groups to obtain silanized graphene oxide.

[0020] Among them, the reduction preparation of silanized graphene is obtained by reducing the silanized graphene oxide with...

Embodiment 1

[0024] The graphene oxide prepared by the improved Hummers method was completely dried at a low temperature of 40°C, then dispersed in deionized water, and ultrasonically dispersed for 2 hours until the graphene oxide was uniformly dispersed. Add 10wt% dilute hydrochloric acid aqueous solution to it to adjust the pH of the solution to about 3, GO and the charged silane coupling agent decitronium chloride carry out a silanization reaction, and then use hydrazine hydrate to reduce the silanized graphene oxide, and finally An ion exchange reaction occurs between the silanized graphene and the anionic surfactant to obtain the final product. Since the pH value of the solution has an effect on the grafting density of the silane coupling agent during the silylation reaction, the product at this pH value is named RGO-Si-N + SO 3 - (pH=3). Specific steps are as follows:

[0025] 1), the preparation of graphene oxide, adopt improved Hummers method to prepare graphene oxide (GO), get...

Embodiment 2

[0027] The graphene oxide prepared by the improved Hummers method was completely dried at a low temperature of 40°C, then dispersed in deionized water, and ultrasonically dispersed for 2 hours until the graphene oxide was uniformly dispersed. Add 10wt% dilute hydrochloric acid and sodium hydroxide aqueous solution to adjust the pH of the solution to about 7. GO is silanized with the charged silane coupling agent dicermonium chloride, and then the silanized graphene oxide is silanized with hydrazine hydrate. Reduction is carried out, and finally an ion exchange reaction occurs between the silanized graphene and the anionic surfactant to obtain the final product. Since the pH value of the solution has an effect on the grafting density of the silane coupling agent during the silylation reaction, the product at this pH value is named RGO-Si-N + SO 3 - (pH=7). Specific steps are as follows:

[0028] 1), the preparation of graphene oxide, adopt improved Hummers method to prepare...

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Abstract

The invention discloses a preparation method of ionic-type amphiphilic functionalized graphene.The preparation method includes the steps of subjecting expanded graphite to oxidation treatment by strong acid concentrated sulfuric acid, potassium permanganate and strong oxidizer-hydrogen peroxide according to a Hummers method so as to obtain oxidized graphene; performing silanization treatment, namely forming an Si-O-C bond between surface hydroxyl of the oxidized graphene and a high-activity silane coupling agent of an ionic structure; subjecting silanized oxidized graphene to reducing preparation, namely using a reducing agent reducing agent for reducing the silanized oxidized graphene, and reducing off oxygen-bearing groups such as epoxy, carbonyl and carboxyl, not participating in silanization reaction, on the surface of the silanized oxidized graphene so as to obtain silanized graphene; performing ion exchange, namely subjecting anionic surfactants and anions on the surface of the silanized graphene to ion exchange so as to obtain final functionalized graphene.High-quality uniformity and stripping dispersion of the ionic-type amphiphilic functionalized graphene with high dispersion stability in composites can be improved beneficially.

Description

technical field [0001] The invention relates to a preparation method of functionalized graphene, in particular to a preparation method of ionic amphiphilic functionalized graphene. Background technique [0002] Graphene is a new type of two-dimensional nanosheet material, which is a planar film of hexagonal honeycomb lattice formed by sp2 hybridization of carbon atoms. Graphene has attracted the attention of many researchers due to its excellent mechanical properties, thermal conductivity and electrical properties, and has been applied in the fields of electricity, mechanics, biomedicine, catalysis, and environmental protection. Graphene nanosheets are closely combined by van der Waals force and π-π conjugation, so it is difficult to obtain stable single-layer graphite, that is, graphene, which severely limits the application range of graphene. Therefore, the functional modification of graphene is a prerequisite for expanding its application range. Normally, the functional...

Claims

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Application Information

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IPC IPC(8): C01B31/04
CPCC01B2204/20
Inventor 林浩伟邱超李金玲宋伟强吴刘锁赵悦菊滕济林郝骏春吴谢东郭志锐张丽丽李学军柴云峰李秋丽
Owner HENAN UNIVERSITY OF TECHNOLOGY
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