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Viologen/cellulose nanocrystal composite film, preparation method of same, and detachable electrochromic device

An electrochromic device and nanocrystal composite technology, which can be used in instruments, optics, nonlinear optics, etc., can solve the problems of difficult separation and loss of the electrochromic layer and the conductive matrix, and achieve good electrochromic performance and low cost. , the effect of reducing costs

Active Publication Date: 2017-12-22
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, in order to solve the problem that the electrochromic layer is not easily separated from the conductive matrix, the present invention provides a detachable electrochromic device, which avoids material loss due to failure of the electrolyte or active layer

Method used

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  • Viologen/cellulose nanocrystal composite film, preparation method of same, and detachable electrochromic device
  • Viologen/cellulose nanocrystal composite film, preparation method of same, and detachable electrochromic device

Examples

Experimental program
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Effect test

Embodiment 1

[0045] Put 20g of pulp raw material (provided by Hubei Chemical Fiber Cellulose Co., Ltd., with a degree of polymerization of 700) in a water bath at 50°C, slowly add concentrated sulfuric acid (commercially available) with a concentration of 64% for acidolysis, and add ten times of The reaction was terminated with deionized water, and after standing for 24 hours, the supernatant was discarded, and the lower layer was centrifuged at a speed of 8000rpm for 10 minutes, centrifuged 6 times, and the final suspension was dialyzed for 5 days, and placed in the refrigerator for later use. Concentration 10mg / ml. Take the cellulose nanocrystal suspension prepared above and concentrate it to 35 mg / ml by 50 ℃ rotary steaming method, take 40 parts by weight of cellulose nanocrystal, then add 0.01M methyl viologen (take methyl viologen parts by weight) and 0.1M potassium chloride (10 parts by weight of potassium chloride), after mixing the three evenly with a micro-vortex mixer, spread the...

Embodiment 2

[0047] The process flow is the same as in Example 1, except that the cellulose nanocrystal suspension prepared above is concentrated to 35 mg / ml by rotary steaming at 50°C, and the weight of cellulose nanocrystals is 50 parts, and then 0.01M Methyl viologen (100 parts by weight of methyl viologen) and 0.1M potassium chloride (5 parts by weight of potassium chloride), after mixing the three evenly with a micro-vortex mixer, spread drying in a petri dish at 23° C. and a relative humidity of 50-60 percent to obtain a viologen / cellulose nanocrystal composite film.

Embodiment 3

[0049] The process flow is the same as in Example 1, except that the cellulose nanocrystal suspension prepared above is concentrated to 35 mg / ml by rotary steaming at 50°C, and 25 parts by weight of the cellulose nanocrystal are taken, and then 0.08M Methyl viologen (100 parts by weight of methyl viologen) and 0.1M potassium chloride (5 parts by weight of potassium chloride), after mixing the three evenly with a micro-vortex mixer, spread drying in a petri dish at 23° C. and a relative humidity of 50-60 percent to obtain a viologen / cellulose nanocrystal composite film.

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Abstract

The invention provides a viologen / cellulose nanocrystal composite film and a preparation method of same. The method includes the steps of: preparing a cellulose nanocrystal suspension liquid, a viologen solution and an electrolyte solution in different concentrations, and uniformly blending the three liquids according to certain ratio, and processing the mixture liquid into the film through a natural volatilization method. The viologen / cellulose nanocrystal composite film has excellent light transmittance and toughness, has electrochromic property, is simple in preparation method, and overcomes the defects of poor film forming property of the viologen and high preparation cost. The invention also provides a detachable electrochromic device, which is prepared by clamping a wetted composite film between two slices of transparent electric-conductive substrates to form a sandwich structure, and packaging the four edges with double faced adhesive tape. The detachable electrochromic device is convenient to recover, so that the application range of a viologen electrochromic device is enlarged.

Description

technical field [0001] The invention belongs to the field of functional color-changing materials, and furthermore, relates to a viologen / cellulose nanocrystal composite film, a preparation method thereof, and a detachable electrochromic device. Background technique [0002] Cellulose is a natural polymer with abundant resources in nature. The product with high crystallinity - cellulose nanocrystals can be prepared by acid hydrolysis and other methods. Cellulose nanocrystals have a length of 50-500nm and a width of 5-10nm. They have the advantages of high specific surface area, high strength, low expansion coefficient and transparency. They are widely used in the fields of nano-fillers, drug delivery and optical devices. Due to acid The surface of the cellulose nanocrystal prepared by hydrolysis has abundant sulfonate groups, so the cellulose nanocrystal can form a uniform and stable aqueous dispersion. A uniform and transparent cellulose nanocrystal film can be obtained by...

Claims

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Application Information

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IPC IPC(8): C08L1/04C08K5/3432C08J5/18G02F1/15
CPCG02F1/15C08J5/18C08K5/3432G02F1/15165C08L2201/06C08J2301/04C08L1/04
Inventor 蒋敏苏云段咏欣张建明
Owner QINGDAO UNIV OF SCI & TECH
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