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Oxidized graphene based light-driven two-layer composite membrane and preparation method and application thereof

A double-layer composite and graphene film technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as difficulty in shrinking and integrating, large volume of external equipment, etc., and achieve fast response and deformation Great effect with good controllability

Active Publication Date: 2017-08-11
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • 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

Method used

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  • Oxidized graphene based light-driven two-layer composite membrane and preparation method and application thereof
  • Oxidized graphene based light-driven two-layer composite membrane and preparation method and application thereof
  • Oxidized graphene based light-driven two-layer composite membrane and preparation method and application thereof

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preparation example Construction

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

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

[0033] The graphene oxide powder can be dispersed in the second solvent to form a dispersion liquid, and the dispersion liquid is placed on a 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 structural skeleton of the graphene, and the oxygen-containing functional groups include hydroxyl groups, carboxyl groups or epoxy bonds. The second solvent includes one or a mixture of two or more of water, methanol, ethanol, ethylene glycol, and isopropanol in any ratio.

[0035] In this step, the dispersion liquid is placed on a substrate to evaporate the solvent, where the su...

Embodiment 1

[0047] See Figure 1 to Figure 3 , Weigh 150 mg of graphene oxide powder and disperse in 50 ml of water, and ultrasonically disperse for 1 hour to prepare a dispersion with a concentration of 3 mg / 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, an oligo-layer graphene oxide film 1 with certain transparency is obtained. After that, 10mL of 0.3nM gold nanorods, namely precious metal nanomaterials 3 (length-to-diameter ratio of 2) were dispersed in 0.2mL of ethanol, and fully stirred for 0.5h; the solution was added to 3g of PDMS precursor and ultrasonically stirred 1h, heated at 40 degrees for 10 minutes to evaporate ethanol, then add 0.3g of PDMS cross-linking agent, and continue to ultrasonically stir for 0.5h to obtain a viscous mixture of PDMS and gold nanorods, namely a mixture of PDMS and precious metal nanomaterials . Fix the glass substrate with the graphene oxide film 1 attached ...

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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 a preparation method and application thereof, in particular to a light-driven double-layer composite film based on graphene oxide and a preparation method and application thereof. 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 technical means such as micro-processing. It has micro-integration, low-cost, high-efficiency and high-speed, samples and reagents. The advantages of low consumption, etc., have broad application prospects in many fields such as environmental detection and protection, biomedicine, food hygiene, etc. [0003] The microvalve is a key device that controls the microfluid in the flow channel and 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 m...

Claims

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Application Information

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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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