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A method for synthesis of silica coated graphene functional hybrid material

A technology for synthesizing silicon dioxide and silicon dioxide, which is applied in the direction of silicon dioxide, silicon oxide, chemical instruments and methods, etc., and can solve problems such as large-scale production is not good enough

Active Publication Date: 2017-05-10
上海瑞烯新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, the results were not good enough for mass production

Method used

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  • A method for synthesis of silica coated graphene functional hybrid material
  • A method for synthesis of silica coated graphene functional hybrid material
  • A method for synthesis of silica coated graphene functional hybrid material

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Experimental program
Comparison scheme
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Embodiment

[0058] Graphene oxide (GO) was synthesized from natural graphite flakes following a modified Hummers method (described in Hummers WS, Offeman R E 1958 J. Am. Chem. Soc. 80, 1339).

[0059]Under mechanical stirring, 0.5 g of ammonium chloride was slowly added to 100 ml of aqueous GO suspension with a GO concentration of 10 mg / ml, followed by sonication for 10 min.

[0060] With this treatment, NH 4 + Adsorbed by negatively charged GO. The resulting adsorbed NH 4 + Ionic GO colloids (GO@NH 4 + ) were separated from the solution and redispersed into deionized water with the aid of ultrasound.

[0061] The thus obtained GO@NH 4 + Dispersions.

[0062] Here, TEOS acts as a precursor for silica.

[0063] Silane coupling agents are used to form covalent bonds between GO and silica nanoparticles while providing additional functional groups to the final fG@silica.

[0064] The pH of the silica self-assembly solution was adjusted to 12 using a base to facilitate the hydrolys...

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Abstract

A process for synthesis of silica coated graphene hybrid material comprising the steps of treating graphene oxide with ammonium ions to provide ammonium- activated graphene oxide; treating the ammonium-activated graphene oxide with a solution comprising silica precursors; and silane coupling agents that comprise functional groups, to provide self-assembly of silica nanoparticles on the surface of the ammonium-activated graphene oxide and covalent bonding between the nanoparticles and the surface to provide silica coated graphene oxide; and grafting of the functional groups on the surface of the silica coated graphene oxide to provide functionalized silica coated graphene oxide; and reducing the functionalized silica coated graphene oxide to provide functionalized silica coated graphene. Silica coated graphene hybrid material obtainable by this process.

Description

technical field [0001] The present invention relates to methods for the synthesis of silica-coated graphene hybrid materials. The invention also relates to the silica-coated graphene hybrid material obtainable by this method, and to the use of this material as a filler for composite materials, for drug delivery and as a catalyst support. Background technique [0002] Graphene, a two-dimensional (2-D) nanomaterial that has nanoscale dimensions only in thickness and micrometer-scale length in plane, has attracted great attention due to its unique properties and large surface area. [0003] Potential applications in the fields of drug delivery and catalyst supports as well as fillers for composite materials have shown their great value in both academic and industrial fields. [0004] Therefore, producing graphene in high yield while maintaining its large surface area without agglomeration becomes a key issue. [0005] Substantial efforts have been made on the surface modifica...

Claims

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Application Information

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IPC IPC(8): C01B32/198C01B33/12
CPCC01B33/12C01B33/18C01P2004/64C01P2004/84C01B32/23B01J35/19B01J35/50A61K47/02B01J21/08B01J21/18B01J37/0221C01P2002/82C01P2004/04C01P2004/80C09C1/46
Inventor 约翰·刘
Owner 上海瑞烯新材料科技有限公司