Reversible thermochromatic film based on graphene electrothermal driving, preparation and application of reversible thermochromatic film

A thermochromic, electrothermally driven technology, applied in the direction of layered products, etc., to achieve the effects of fast discoloration time, mild reaction conditions, and simple preparation methods

Active Publication Date: 2017-05-31
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because there is a lack of a material that heats up quickly and cools down quickly

Method used

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  • Reversible thermochromatic film based on graphene electrothermal driving, preparation and application of reversible thermochromatic film
  • Reversible thermochromatic film based on graphene electrothermal driving, preparation and application of reversible thermochromatic film
  • Reversible thermochromatic film based on graphene electrothermal driving, preparation and application of reversible thermochromatic film

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The preparation method of graphene oxide: Take 500 meshes and 3g flake graphite powder into a three-necked flask, add 69mL (95%-98%) concentrated sulfuric acid pre-frozen to 0°C. Slowly add 9 g of potassium permanganate in an ice-water bath, and then transfer to a 35° C. oil bath and keep stirring for 2 hours (the three-necked flask does not need to be stoppered, just leave it open). Set the heating temperature gradient to 35°C-50°C-65°C-80°C-98°C, and slowly add 138mL of ultrapure water dropwise during the heating process, and keep it at 98°C for 30min after the dropwise addition. During the addition of water, the color of the dispersion changed from black to dark green to reddish brown to golden yellow. Pour the solution in the flask into a preheated (about 30°C) solution (140mL ultrapure water + 2.5mL hydrogen peroxide) and cool naturally to room temperature. Use 250mL (1:10HCl, hydrochloric acid is 36-38%) to prepare a solution, and add it to the above-mentioned gr...

Embodiment 2

[0037] Reduced graphene oxide was prepared by the method reported in the literature (Advanced Materials, 2016, DOI: 10.1002 / adma.201603395.). Disperse 100 mg of graphene oxide powder into 100 mL of deionized water and sonicate with a cell disruptor for 0.5 h. Add 4 mL of ammonia water to the graphene oxide dispersion at one time, measure the pH of the mixture with a pH meter, and control it at 9-12. Weigh 0.1 mg of hydrazine hydrate solution and add it dropwise to the stirring graphite oxide solution, then heat the mixed liquid to 90° C. with a heating platform. Stir and seal the heat for 2 hours, that is, the solution turns from brown to black to complete the graphite oxide reduction process.

[0038] Take 10 mL of the reduced graphene oxide stock solution in a 150 mL beaker, and add 90 mL of ultrapure water to dilute to 100 mL to obtain a 0.01 mg / mL black translucent and uniformly dispersed reduced graphene oxide dispersion. Weigh 30 mL of the diluted reduced graphene oxid...

Embodiment 3

[0042] Reduced graphene oxide was prepared by the method reported in the literature (Advanced Materials, 2016, DOI: 10.1002 / adma.201603395.). Disperse 100 mg of graphene oxide powder into 100 mL of deionized water and sonicate with a cell disruptor for 0.5 h. Add 4 mL of ammonia water to the graphene oxide dispersion at one time, measure the pH of the mixture with a pH meter, and control it at 9-12. Weigh 0.1 mg of hydrazine hydrate solution and add it dropwise to the stirring graphite oxide solution, then heat the mixed liquid to 90° C. with a heating platform. Stir and seal the heat for 2 hours, that is, the solution turns from brown to black to complete the graphite oxide reduction process.

[0043] Take 10 mL of the reduced graphene oxide stock solution in a 150 mL beaker, and add 90 mL of ultrapure water to dilute to 100 mL to obtain a 0.01 mg / mL black translucent and uniformly dispersed reduced graphene oxide dispersion. Weigh 10 mL of the diluted reduced graphene oxid...

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Abstract

The invention relates to a reversible thermochromatic film based on graphene electrothermal driving, preparation and application of the reversible thermochromatic film. The reversible thermochromatic film comprises a heat source layer, a substrate layer and a chromatic layer. The preparation comprises the following steps: mixing reversible chromatic ink and water, obtaining reversible chromatic ink solution, then loading on the surface of a carrier film, drying to obtain reduced graphene oxide / carrier film / reversible thermochromatic film, connecting with a loop and obtaining the reversible thermochromatic film. The reversible thermochromatic film has the advantages of simple structure, higher sensitivity and better cycling stability.

Description

technical field [0001] The invention belongs to the field of thermochromic materials and their preparation and application, in particular to a reversible thermochromic film driven by graphene electrothermal and its preparation and application. Background technique [0002] Thermochromic materials refer to functional materials whose visible absorption spectrum changes when some compounds or mixtures are heated or cooled. It has the characteristic that its color changes with temperature. The temperature at which the color changes occurs is called the discoloration temperature. This material is a thermal memory functional material, which is widely used in various fields such as industry, textile, military, printing, medical care, diagnosis, construction, anti-counterfeiting marks, daily decoration, aerospace and so on. [0003] Graphene is a carbon material in which carbon atoms are tightly packed into a single-layer or few-layer two-dimensional honeycomb lattice structure. It ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B9/00B32B9/04
CPCB32B9/00B32B9/007B32B9/04
Inventor 王宏志李强穆九柯侯成义李耀刚张青红
Owner DONGHUA UNIV
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