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Super-hydrophobic silicon-oxide hybridized graphene aerogel micropowder and preparation method and application thereof

A technology of graphene airgel and silicon oxide, which is applied in the direction of silicon oxide, silicon dioxide, chemical instruments and methods, etc., can solve the problem of discontinuous overlapping of graphene sheets, no effective solution proposed, airgel conductivity It can solve problems such as the decline of efficiency, and achieve excellent static microwave shielding and infrared shielding, suitable for large-scale production, and excellent electrical effects.

Active Publication Date: 2018-10-30
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this method, graphene oxide sheets and siloxane are easily mixed unevenly, resulting in discontinuous overlap between graphene sheets, and there will be agglomerated silicon oxide particles mixed between graphene sheets, which cannot form The continuous graphene network structure leads to a decrease in the electrical conductivity of the final airgel, and the patent CN 104860304 A does not propose an effective solution for preparing superhydrophobic silicon oxide hybrid graphene airgel micropowder

Method used

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  • Super-hydrophobic silicon-oxide hybridized graphene aerogel micropowder and preparation method and application thereof

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preparation example Construction

[0047] The embodiment of the present invention also provides a preparation method of superhydrophobic silicon oxide hybrid graphene airgel micropowder, comprising the following steps:

[0048] (1) provide block graphene hydrogel, carry out crushing process to described graphene hydrogel, be dispersed in ethanol again, obtain graphene alcohol gel particle;

[0049] (2) mixing the graphene alcohol gel particles with a silicon source, adding an alkali catalyst for catalytic hydrolysis, and standing to obtain silicon oxide hybrid graphene alcohol gel particles;

[0050] (3) After replacing the obtained silicon oxide hybrid graphene alcohol gel particles with a non-polar organic solvent, and then modifying them with a hydrophobizing agent to obtain superhydrophobic silicon oxide hybrid graphene alcohol gel particles ;

[0051] (4) Drying the superhydrophobic silicon oxide hybrid graphene alcohol gel particles to obtain superhydrophobic silicon oxide hybrid graphene airgel micropow...

Embodiment 1

[0086] (1) Preparation of graphene alcohol gel particles: 10mg / mL graphene oxide aqueous solution and VC were mixed according to the mass ratio of 1:8, after standing at 40°C for 24h, block graphene hydrogel was obtained, and then Pulverize for 5 minutes with a pulverizer, and disperse in ethanol to obtain graphene alcohol gel particles.

[0087](2) Preparation of hydrophobic graphene alcohol gel particles: use magnetic stirring to mix graphene alcohol gel particles and poly(alkoxysiloxane) according to the mass ratio of 1:10 for 24 hours, then add 5mL ammonia water, water bath After standing at 40° C. for 12 hours, graphene alcohol gel particles modified with silica nanoparticles were obtained. Then use N,N-dimethylformamide to replace the ethanol in the graphene alcohol gel particles, add 20mL trimethylchlorosilane to modify it for 8h, replace it with ethanol, wash off N,N-dimethylformamide and residual Trimethylchlorosilane to obtain hydrophobic graphene alcohol gel partic...

Embodiment 2

[0091] (1) Preparation of graphene alcohol gel particles: 10mg / mL graphene oxide aqueous solution and VC were mixed according to the mass ratio of 1:8, after standing at 40°C for 24h, block graphene hydrogel was obtained, and then The colloid mill grinds the bulk hydrogel for 30 seconds and disperses it in ethanol to obtain graphene alcohol gel particles.

[0092] (2) Preparation of hydrophobic graphene alcohol gel particles: use magnetic stirring to mix graphene alcohol gel particles and poly(alkoxysiloxane) according to the mass ratio of 1:10 for 24 hours, then add 5mL ammonia water, water bath After standing at 40° C. for 12 hours, graphene alcohol gel particles modified with silica nanoparticles were obtained. Then use N,N-dimethylformamide to replace the ethanol in the graphene alcohol gel particles, add 20mL trimethylchlorosilane to modify it for 8h, replace it with ethanol, wash off N,N-dimethylformamide and residual Trimethylchlorosilane to obtain hydrophobic graphene...

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Abstract

The invention discloses super-hydrophobic silicon-oxide hybridized graphene aerogel micropowder and a preparation method and application thereof. The super-hydrophobic silicon-oxide hybridized graphene aerogel micropowder comprises silicon oxide nanoparticles and a continuous three-dimensional porous network structure formed by a graphene sheet layer; the three-dimensional porous network structurecomprises micropores, mesoporous and macropores, and the silicon oxide nanoparticles are at least distributed on two sides of the graphene sheet layer. The preparation method of the super-hydrophobicsilicon-oxide hybridized graphene aerogel micropowder includes: providing bulk graphene hydrogels to acquire graphene alcogel particles; preparing silicon-oxide hybridized graphene alcogel particles;preparing super-hydrophobic silicon-oxide hybridized graphene alcogel particles; preparing the super-hydrophobic silicon-oxide hybridized graphene aerogel micropowder. Compared with the prior art, the super-hydrophobic silicon-oxide hybridized graphene aerogel micropowder is small in size, low in intensity, good in hydrophobicity and chemical stability, simple in preparation process, moderate andcontrollable in reaction conditions and wide in application prospect.

Description

technical field [0001] The invention relates to a graphene airgel micropowder, in particular to a superhydrophobic silicon oxide hybrid graphene airgel micropowder, a preparation method and an application thereof, and belongs to the technical field of nanoporous materials. Background technique [0002] The generation of airgel originated in the 1930s, a substance accidentally invented by chemist Sterven.S.Kistler of California Pacific University, commonly known as "frozen smoke", which is to extract the water in silica gel, and then use it to Made by displacing water with a gas such as carbon dioxide. As a highly porous nanomaterial, airgel is currently the world's lightest solid material with the best thermal insulation performance. After more than 80 years of development, airgel materials have been gradually commercialized and have important applications in many fields. Graphene airgel has broad application prospects in the fields of energy storage, catalysis, adsorption...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/194C01B33/18
CPCC01B32/194C01B33/18C01P2002/01C01P2004/03C01P2004/61C01P2006/10C01P2006/12C01P2006/14
Inventor 张学同吴晓涵
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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