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Nanosilver/graphene oxide composite dispersion fluid, and preparation method and application thereof

A technology of composite materials and graphene, which is applied in the field of nanocomposite materials and its preparation, to achieve the effect of strong repeatability and inhibition of agglomeration

Active Publication Date: 2017-02-15
BEIJING UNIV OF CHEM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The dispersion is stable for 6 months without settling

Method used

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  • Nanosilver/graphene oxide composite dispersion fluid, and preparation method and application thereof
  • Nanosilver/graphene oxide composite dispersion fluid, and preparation method and application thereof
  • Nanosilver/graphene oxide composite dispersion fluid, and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] 1) adopt improved Hummers method to prepare graphene oxide, obtain the 0.5mg / ml graphene oxide dispersion liquid of 720ml through drying again;

[0071] 2) Preparation of mixed solution: add ammonia solution to the graphene oxide dispersion to adjust the pH value of the system to 12, and add 20 g of protective agent polyvinylpyrrolidone (PVP) to obtain a mixed solution;

[0072] 3) prepare the 0.05M / L silver nitrate aqueous solution of 60ml;

[0073] 4) First add the mixed solution into the supergravity rotating packed bed reactor, then add the silver salt solution, and react for 10 minutes under the reaction conditions of a temperature of 40°C and a rotation speed of 1500r / min to obtain a nano-silver / graphite oxide composite material;

[0074] 5) Wash the nano-silver / graphite oxide composite material obtained in 4), and then disperse it in water to obtain a 0.5 mg / ml aqueous dispersion of nano-silver / graphite oxide composite material.

[0075] figure 1 A transmission...

Embodiment 2

[0078] 1) adopt improved Hummers method to prepare graphene oxide, obtain the 2mg / ml graphene oxide dispersion liquid of 720ml through drying again;

[0079] 2) Preparation of mixed solution: add ammonia solution to the graphite oxide dispersion to adjust the pH value of the system to 11; add 20 g of protective agent cetyltrimethylammonium bromide to obtain a mixed solution;

[0080] 3) prepare the 0.05M / L silver acetate aqueous solution of 60ml;

[0081] 4) First add the mixed solution into the supergravity rotating packed bed reactor, then add the silver salt solution, and react for 3 minutes under the reaction conditions of a temperature of 60°C and a rotation speed of 500r / min to obtain a nano-silver / graphite oxide composite material;

[0082] 5) Wash the nano-silver / graphite oxide composite material obtained in 4), and then disperse it in water to obtain a 10 mg / ml aqueous dispersion of nano-silver / graphite oxide composite material.

Embodiment 3

[0084] 1) adopt improved Hummers method to prepare graphene oxide, obtain the graphene oxide dispersion liquid of the 5mg / ml of 720ml through drying again;

[0085] 2) Preparation of the mixed solution: adding a dopamine aqueous solution to the graphite oxide dispersion to adjust the pH value of the system to 8, adding 20 g of protective agent oleic acid to obtain a mixed solution;

[0086] 3) prepare the 0.05M / L silver carbonate aqueous solution of 60ml;

[0087] 4) First add the mixed solution into the supergravity rotating packed bed reactor, then add the silver salt solution, and react for 20 minutes under the reaction conditions of a temperature of 50°C and a rotation speed of 2500r / min to obtain a nano-silver / graphite oxide composite material;

[0088] 5) The nano-silver / graphite oxide composite material obtained in 4) is washed and then dispersed in water to obtain a 0.01 mg / ml aqueous dispersion of nano-silver / graphite oxide composite material.

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Abstract

The invention discloses a nanosilver / graphene oxide composite dispersion fluid, and a preparation method and application thereof. The dispersion fluid comprises a liquid medium and a nanosilver / graphene oxide composite, wherein the nanosilver / graphene oxide composite is uniformly dispersed in the liquid medium; the concentration of the dispersion fluid is 0.01 to 10 mg / ml; and nanosilver particles in the nanosilver / graphene oxide composite are uniformly dispersed and adhered onto the surface of graphene oxide, and the sizes of the nanosilver particles are in a range of 5 to 50 nm. According to the invention, a hypergravity rotating packed bed or a micro-channel reactor is used as reaction equipment; no reducing agent is needed in the process of preparation; and the prepared nanosilver / graphene oxide composite dispersion fluid is transparent and stable and is free of precipitates after standing for six months. Compared with the prior art, the method provided by the invention is rapid, simple, efficient and applicable to large-scale industrial production. The nanosilver / graphene oxide composite dispersion fluid provided by the invention has wide application prospects in fields like catalysis, energy storage, electronics, antibiosis and surface Raman enhancement.

Description

technical field [0001] The invention relates to the field of nanocomposite materials and their preparation. More specifically, it relates to a nano-silver / graphene oxide composite material dispersion and its preparation method and application. Background technique [0002] Graphene is a new type of two-dimensional carbon material with a single-layer carbon atom thickness. The carbon atoms are arranged in a regular hexagonal honeycomb lattice. 2 hybridization. In 2004, British scientists Geim and Novoselov et al. (Novoselov K S, Geim A K, Morozov S V, Jiang D, Zhang Y, Dubonos S V, Grigorieva I V, Firsov A A. Electric field effect in atomically thin carbon films[J]. Science, 2004, 306 :666-669; Geim A K, Novoselov K S.The rise of graphene[J].Nat Mater.,2007,6:183-191) people first prepared stable high-quality single-layer graphene by mechanically exfoliating graphite , the two scientists also won the 2010 Nobel Prize in Physics for their breakthrough work. Graphene has a ...

Claims

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Application Information

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IPC IPC(8): B01J23/50C09K5/08A01N59/16A01P1/00G01N21/65B82Y30/00B82Y40/00
Inventor 陈建峰韩兴威曾晓飞
Owner BEIJING UNIV OF CHEM TECH
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