Optically driven bilayer composite film based on graphene oxide and its preparation method and application

A double-layer composite, graphene film technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of large volume, difficulty in shrinking and integration of external equipment, and achieve fast response speed and deformation. The effect of large degree and good controllability

Active Publication Date: 2019-10-11
HEFEI UNIV OF TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, this PDMS microvalve also has disadvantages, that is, the pneumatic power needs to use an external air source and control valve, and the external equipment is large in size, which is usually difficult to reduce and integrate

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  • Optically driven bilayer composite film based on graphene oxide and its preparation method and application
  • Optically driven bilayer composite film based on graphene oxide and its preparation method and application
  • Optically driven bilayer composite film based on graphene oxide and its preparation method and application

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preparation example Construction

[0031] The preparation method of the graphene oxide-based light-driven double-layer composite film of the present invention comprises the following steps.

[0032] 1. Preparation of graphene oxide films with optical transparency.

[0033] The graphene oxide powder can be dispersed into solvent two to form a dispersion liquid, and the dispersion liquid is placed on the substrate and evaporated at low temperature to form a graphene oxide film with certain transparency.

[0034] In this step, the graphene oxide is a two-dimensional planar material containing various oxygen-containing functional groups on the graphene structural skeleton, and the oxygen-containing functional groups include hydroxyl, carboxyl or epoxy bonds. Solvent two includes one of water, methanol, ethanol, ethylene glycol, and isopropanol or a mixture of two or more in any proportion.

[0035] In this step, the dispersion liquid is placed on the substrate to evaporate the solvent, wherein the substrate is one...

Embodiment 1

[0047] see Figure 1 to Figure 3 , weighed 150mg of graphene oxide powder and dispersed it in 50ml of water, ultrasonically dispersed for 1h, and configured into a dispersion with a concentration of 3mg / ml. Take 3ml graphene oxide dispersion and place it to a size of 75x25cm 2 After drying at a low temperature of 50° C. on a glass substrate, a few-layer graphene oxide film 1 with certain transparency is obtained. After that, disperse 10 mL of 0.3 nM gold nanorods, that is, noble metal nanomaterials 3 (with an aspect ratio of 2), into 0.2 mL of ethanol, and stir thoroughly for 0.5 h; add the solution to 3 g of PDMS precursor, and ultrasonically stir 1h, heated at 40°C for 10 minutes to evaporate ethanol, then added 0.3g of PDMS cross-linking agent, and continued ultrasonic stirring for 0.5h to obtain a viscous mixture of PDMS and gold nanorods, that is, a mixture of PDMS and noble metal nanomaterials . Fix the glass substrate with the graphene oxide film 1 attached on the su...

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Abstract

The invention discloses an oxidized graphene based light-driven two-layer composite membrane and a preparation method and application thereof. The oxidized graphene based light-driven two-layer composite membrane produces bending deformation under light irradiation and comprises a PDMS and precious metal nano material mixture layer and an oxidized graphene film flatly laid and fixed to the mixture layer and having optical transparency. The preparation method of the oxidized graphene based light-driven two-layer composite membrane comprises the steps that the oxidized graphene film having optical transparency is prepared; the PDMS and precious metal nano material mixture layer is prepared; the two-layer composite membrane is prepared. The oxidized graphene based light-driven two-layer composite membrane produces controllable bending deformation under simulated sunlight irradiation and the coupling effect of optical-thermal-mechanical asymmetric composite structure, has the advantages of being transparent, flexible, large in deformation degree, good in controllability, remotely controllable and operatable and the like and can be applied to a light-driven flexible mechanical device, micro-vale for controlling microfluidics in a micro-fluidic chip and the like.

Description

technical field [0001] The invention relates to a composite film and its preparation method and application, in particular to a graphene oxide-based light-driven double-layer composite film and its preparation method and application. Background technique [0002] Microfluidic chip refers to a micro-full analysis system that integrates various operational analysis functions involved in the field of biochemistry on chip materials through micro-processing and other technical means. With the advantages of low consumption, it has broad application prospects in many fields such as environmental detection and protection, biomedicine, and food hygiene. [0003] The microvalve is a key device that controls the microfluidics in the flow channel, realizes the opening and closing of the fluid channel, and the switching of the fluid flow direction. It is one of the most important parts of the microfluidic system. Conventional microvalve devices are usually based on silicon wafers, glass...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/70B01D69/12B01D69/02B01D67/00B01L3/00
Inventor 胡颖许爱凤郝予琛常龙飞李亨齐珂杨露露
Owner HEFEI UNIV OF TECH
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