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Preparation method of ordered nano fiber-based flexible graphene film by induction of capillary action

A capillary action, flexible graphite technology, used in fiber processing, plant fibers, textiles and papermaking, etc., can solve the problems of incompatibility with complex curved surfaces, difficult to accurately control thickness, and large influence on electrical conductivity, to improve physical interaction. Action and adhesion, good flexibility, workable results

Active Publication Date: 2018-03-13
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods are often a serious waste of raw materials, the thickness is difficult to control accurately, the reduction treatment has a great impact on the electrical conductivity, the process is complex, the cost is high, and the flexibility is not suitable for bonding on complex curved surfaces.
At the same time, the current use of toxic organic solvents as reducing agents in the process of preparing graphene films has brought many negative impacts on the environment and humans, and will also bring about fatal biological safety issues for flexible substrates and wearable devices.

Method used

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  • Preparation method of ordered nano fiber-based flexible graphene film by induction of capillary action
  • Preparation method of ordered nano fiber-based flexible graphene film by induction of capillary action
  • Preparation method of ordered nano fiber-based flexible graphene film by induction of capillary action

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] a) Dissolve cellulose acetate in acetic acid with a concentration of 17wt.%, mix and stir evenly to obtain a spinning solution; at 29.5℃, humidity 20%, spinning voltage 25kV, receiving roller speed 2000rpm, injection needle flow rate 1.5 mL / h, when the receiving distance between the injection needle and the receiving roller is 15cm, electrospinning is performed, and the cellulose acetate film is obtained after drying;

[0023] b) Graphene oxide is prepared by the modified Hummers method, and purified and separated by a 3μm microporous membrane to obtain graphene oxide sheets of uniform size dissolved in water; the specific method for preparing graphene oxide by the Hummers method is: 1g graphite Mix powder and 0.05g sodium chloride, wash with water to remove sodium chloride, dry, add 23mL concentrated sulfuric acid and stir for 22h, add 6g potassium permanganate to the above solution, and keep the temperature at this time not exceeding 20℃, then heat up to The temperature ...

Embodiment 2

[0027] a) Dissolve cellulose acetate in acetic acid with a concentration of 17wt.%, mix and stir evenly to obtain a spinning solution; at 29.5℃, humidity 20%, spinning voltage 25kV, receiving roller speed 2000rpm, injection needle flow rate 1.5mL / h, the receiving distance between the injection needle and the receiving roller is 14cm for electrospinning, and the cellulose acetate film is obtained after drying;

[0028] b) Graphene oxide is prepared by the modified Hummers method, and purified and separated by a microporous filter membrane to obtain graphene oxide sheets of uniform size dissolved in water; the specific method for preparing graphene oxide by the Hummers method is: 1g graphite powder Mix with 0.05g sodium chloride, wash with water to remove sodium chloride, dry, add 23mL concentrated sulfuric acid and stir for 22h, add 6g potassium permanganate to the above solution, and keep the temperature at this time not exceeding 20℃, then heat up to 40 The temperature was kept...

Embodiment 3

[0033] a) The graphene conductive film in Example 1 is hot-pressed again, the hot-pressing condition is 180°C, the pressure is 2 standard atmospheres, and the hot-pressing time is 1800s;

[0034] b) Use a multimeter to test the resistance value of the graphene film under different bending degrees.

[0035] Figure 5 with Image 6 It is the flexibility test of the graphene film, which shows that the greater the degree of bending, the graphene film bends as the cellulose acetate substrate is bent, and the distance between the sheets increases, which leads to an increase in the relative resistance value, which proves that the resistance is more than 2 times through different bending Flexible response to value changes.

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Abstract

The invention discloses a preparation method of an ordered nano fiber-based flexible graphene film by the induction of capillary action. The preparation method comprises the following steps of dissolving cellulose acetate in acetic acid, uniformly mixing and agitating, so as to obtain a spinning solution, carrying out electrostatic spinning, and drying, so as to obtain a cellulose acetate film; preparing graphene oxide, and purifying and separating through a microporous filtering film to obtain a graphene oxide lamella which is uniform in size and soluble in water; uniformly dispersing the graphene oxide in a substrate of the cellulose acetate film by utilizing a vacuum suction filtration method, and drying to subsequently prepare and obtain a graphene oxide film; thermally reducing a sample of the graphene oxide film through hot compression, so that the flexible graphene film using the cellulose acetate film as the substrate, which is prepared by the induction of the capillary action,can be obtained. A tiny capillary is formed in a micron-nano dimension by utilizing the substrate; the graphene oxide infiltrates to enter the surface of the substrate by utilizing the principle of the capillary action; the physical interaction and the adhesive force, with the substrate, of the graphene oxide film are greatly improved and thus, the flexible graphene film can adapt to the abuttingand the application on the surface of a complicated curved surface.

Description

Technical field [0001] The invention relates to a method for preparing a nano material fiber film, in particular to a method for preparing an ordered nano fiber based flexible graphene film induced by capillary action. Background technique [0002] The research of graphene as a film material is still in its infancy, but recent studies have found that it has more potential advantages in touch screens, conductive films, solar cells and light-emitting diodes, such as high sensitivity, high conductivity, and high photoelectricity. Conversion efficiency and high light transmittance etc. Therefore, the application of graphene to conductive film materials is a very promising work. However, the different preparation methods of graphene films have a greater impact on its electrical conductivity, light transmittance, uniformity and other properties, which greatly limits its application as a conductive film material. [0003] Graphene is considered to be one of the best materials for prepa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M11/74D04H1/4258D04H1/728D06M101/08
CPCD04H1/4258D04H1/728D06M11/74D06M2101/08
Inventor 代云茜周洁王世梅徐婉琳曾燚孙乐乐符婉琳黄诚谦孙岳明
Owner SOUTHEAST UNIV
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