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A kind of strength controllable amphiphilic graphene airgel and its preparation method

A graphene airgel and graphene technology, applied in ceramic products, other household utensils, household utensils, etc., can solve the problems of phase separation, poor dispersion of cellulose nanocrystals, and materials without amphiphilic properties, and achieve time-consuming The effect of less, low cost and simple process

Active Publication Date: 2018-11-23
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The fundamental reason is that uncharged cellulose nanocrystals have poor dispersion in water, and most cellulose nanocrystals, like graphene oxide, have negative charges on the surface. Due to the repulsion between the charges, the two are easy to It is uniformly mixed and dispersed in the water phase, but the repulsion between the two components is likely to cause macroscopic phase separation of the two components in the subsequent gel formation process, and nano-level mixing cannot be formed, resulting in the resulting material not having amphiphilic properties and Affects the uniformity of the airgel network structure

Method used

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  • A kind of strength controllable amphiphilic graphene airgel and its preparation method
  • A kind of strength controllable amphiphilic graphene airgel and its preparation method
  • A kind of strength controllable amphiphilic graphene airgel and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0056] Prepare 5mg.ml -1 aqueous dispersion of graphene oxide. Get 6ml of the above graphene oxide water dispersion and place it in a cylindrical bottle, add 2ml of 0.79mg.ml -1 The aqueous dispersion of cellulose nanocrystals was added, and 60 mg of vitamin C was added to the mixed solution, and put into a blast drying oven at 80 degrees Celsius to react for 25 minutes. After taking it out and cooling to room temperature, put it in a refrigerator at -20 degrees Celsius for 3 hours, and then melt it at room temperature. After washing twice with deionized water, it was washed with alcohol, and then placed in a blast drying oven for 24 hours to obtain a hybrid graphene airgel with a cellulose nanocrystal content of 5%.

Embodiment 2

[0058] The type, consumption and technological process of the materials used are the same as in Example 1, except that the concentration of the cellulose nanocrystals used is 1.67mg.ml -1 . A hybrid graphene airgel with a cellulose nanocrystal content of 10% was prepared.

Embodiment 3

[0060] The type, consumption and technological process of the materials used are the same as in Example 1, except that the concentration of the cellulose nanocrystals used is 3.75mg.ml -1 . A hybrid graphene airgel with a cellulose nanocrystal content of 20% was prepared.

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Abstract

The invention provides a strength controllable amphiphilic graphene aerogel and a preparation method thereof. The method includes: mixing graphene oxide water dispersion with negative electricity with acid-hydrolyzed cellulose nanocrystalline water dispersion, adding reducing agent to prepare pre-reduced hydrogel prior to freezing and thawing for one time, and performing further reduction and ambient pressure drying to obtain the graphene aerogel. The graphene aerogel has the advantages that the aerogel is adjustable in strength and has amphipathicity, and the application range of the graphene aerogel is greatly widened.

Description

【Technical field】 [0001] The invention relates to a strength-controllable amphiphilic graphene airgel and a preparation method thereof, which belong to the technical field of new material preparation and also belong to the technical field of airgel preparation. 【Background technique】 [0002] Graphene aerogels composed of pure graphene sheets have the characteristics of hydrophobic and lipophilic, while the graphene aerogels produced in the prior art are all soft materials with small modulus, and there is still a lack of suitable materials for graphene aerogel modules. Quantitative control technology. Cellulose nanocrystals are nanometer-sized crystalline rod-shaped substances separated from cellulose, which are hydrophilic due to the abundant hydroxyl groups on the surface, and cellulose nanocrystals have high modulus and strength. Therefore, combining graphene with cellulose nanocrystals, and optimizing the process conditions and the dosage ratio of the two are expected t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/00C04B30/00
CPCC04B30/00C04B14/024C04B24/383C04B38/0022
Inventor 张建明张晓方段咏欣杨洪生
Owner QINGDAO UNIV OF SCI & TECH
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