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Graphene-polysiloxane composite material and preparation method thereof as well as micro-fluidic chip and application thereof

A polyorganosiloxane, microfluidic chip technology, applied in chemical instruments and methods, fluid heaters, laboratory containers, etc., can solve the problems of poor stability, difficult to widely use, and difficult in the visible light region, etc. To achieve the effect of uniform and stable performance, easy operation and excellent performance

Active Publication Date: 2013-12-11
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are mainly two ways, one is to use resistance wire embedded in the chip for heating, the chip preparation process of this method is complicated, and it is difficult to achieve fixed-point heating, and the other is to use light heating, this method often uses Organic dyes with strong light absorption or noble metal nanoparticles with plasmon resonance effect
However, organic dyes with strong light absorption are complicated to synthesize and have poor stability under strong light irradiation, while noble metal nanoparticles are expensive and difficult to be widely used.
Moreover, the applicable heating wavelength range of both is very limited, and it is more difficult to realize in the visible light region.
[0004] Using graphene-polyorganosiloxane composite materials to make microfluidic chips is an important means to improve the performance of microfluidic chips and expand their application fields in this field, but in the preparation of graphene-polyorganosiloxane composite materials At present, it is mainly through simple mechanical blending method, which is difficult to achieve good dispersion of graphene, which limits the application of graphene in microfluidic chips

Method used

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  • Graphene-polysiloxane composite material and preparation method thereof as well as micro-fluidic chip and application thereof
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  • Graphene-polysiloxane composite material and preparation method thereof as well as micro-fluidic chip and application thereof

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Embodiment 1

[0032] A kind of graphene-polyorganosiloxane composite material of the present invention, this graphene-polyorganosiloxane composite material is mainly made up of polyorganosiloxane matrix and graphene (see figure 1 with figure 2 ),Depend on figure 1 with figure 2It can be seen that graphene is uniformly dispersed in the polyorganosiloxane matrix; the mass ratio of graphene to polyorganosiloxane matrix is ​​0.001:1; graphene is modified by an alkyl chain (dodecyl group selected in this embodiment) The graphene, polyorganosiloxane matrix is ​​polydimethylsiloxane.

[0033] The preparation method of the graphene-polyorganosiloxane composite material of the present embodiment may further comprise the steps:

[0034] (1) Preparation of graphene oxide: Put a three-necked round-bottomed flask in an ice-water bath, add a mixture of 1 g of high-purity graphite and 6 g of potassium permanganate mixed in advance, and slowly add a mixed acid solution (containing 120 mL of concentrat...

Embodiment 2

[0041] A microfluidic chip prepared from the graphene-polyorganosiloxane composite material in Example 1, the specific preparation process of the microfluidic chip includes:

[0042] (1) Prepare the precursor mixed system according to the steps (1) to (3) in Example 1;

[0043] (2) Pour the above precursor mixed system into a container with a microfluidic chip template, let it stand for 10 minutes, and then heat and cure at 65°C for 3 hours to obtain a cured microfluidic chip;

[0044] (3) The above cured microfluidic chip solidified body is removed from the microfluidic chip template to obtain the microfluidic chip of this embodiment.

[0045] Such as image 3 As shown, the microfluidic chip of this embodiment is used as an optical heating platform. When the optical heating is applied, the microfluidic chip is irradiated by a heating light source to increase the temperature of the fluid in the pipeline of the microfluidic chip. The wavelength of the light source is 650nm, t...

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Abstract

The invention discloses a graphene-polysiloxane composite material. The graphene-polysiloxane composite material mainly comprises a polysiloxane matrix and graphene, wherein the graphene is uniformly dispersed in the polysiloxane matrix; the graphene is modified by a hydrophilic group; the polysiloxane matrix is polydimethylsiloxane or derivatives thereof. A preparation method of the graphene-polysiloxane composite material comprises the following steps: firstly, placing a graphene oxide solid in N,N-dimethylformamide and placing aliphatic amine in a uniform dispersion liquid; secondly, reacting at a certain temperature to obtain graphene modified by the hydrophilic group; thirdly, adding the graphene in a precursor of organic siloxane, adding a cross-linking agent, standing a mixed system and heating and curing the mixed system to obtain the graphene-polysiloxane composite material. The composite material disclosed by the invention can be prepared and formed to obtain a micro-fluidic chip which can be used as a light heating platform for application. The graphene-polysiloxane composite material has the advantages of favorable mechanical property, strong heat-conducting property, excellent conducting performance and the like.

Description

technical field [0001] The present invention relates to a composite material composed of graphene and organic polymer and its preparation method and application, in particular to a composite material composed of graphene and organosiloxane and its preparation method, as well as a microstructure prepared from the composite material. Fluidic chip and its application. Background technique [0002] Graphene is a carbon atom with sp 2 A new type of two-dimensional atomic crystal composed of hybridized monoatomic layers, which has many excellent properties, such as extremely high specific surface area, high electron mobility, strong mechanical properties, etc., especially for the preparation of composite Materials that can greatly increase or improve the properties of the base material. However, due to the large π bond structure of graphene, it is easy to accumulate and difficult to disperse in the matrix material, which greatly limits its practical application. In response to ...

Claims

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Application Information

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IPC IPC(8): C08L83/04C08K9/04C08K9/02C08K3/04B01L3/00F24H9/18
Inventor 陶呈安邹晓蓉肖华王建方朱慧盛丽萍孟令强
Owner NAT UNIV OF DEFENSE TECH
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