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Structural color film with humidity response characteristic and preparation method of structural color film

A technology of humidity response and structural color, which is applied in the direction of chemical instruments and methods, coatings, layered products, etc., can solve the problems of poor environmental response cycle effect and weak rapid response ability, and achieve good reversibility and reversibility. good repeatability

Active Publication Date: 2021-11-23
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using the principle of bionics, there have always been two difficulties in the preparation of cellulose liquid crystal films with environmental responses: 1. The ability to quickly respond to the environment is not strong; 2. The cyclic effect of the environmental response is not good.

Method used

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  • Structural color film with humidity response characteristic and preparation method of structural color film
  • Structural color film with humidity response characteristic and preparation method of structural color film
  • Structural color film with humidity response characteristic and preparation method of structural color film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A method for preparing a liquid crystal film with humidity response characteristics, comprising the steps of:

[0041] (1) Wood fibers (taking coniferous wood as an example) were hydrolyzed in 60wt% sulfuric acid for 60min (normal temperature hydrolysis). After the hydrolysis, deionized water with 10 times the sulfuric acid content was added to terminate the reaction. Centrifuge at a temperature of 10°C for 6 minutes to screen the cellulose nanocrystal suspension with a certain size; homogenize the obtained cellulose nanocrystal suspension through a D12 homogenizer for 10 times to obtain fibers with uniform size Suspension of prime nanocrystals; the size of cellulose nanocrystals is 350-600nm;

[0042] (2) Using water to prepare 1wt% and 20wt% glycerin solutions respectively, let stand for 12h, and set aside;

[0043] (3) The cellulose nanocrystal suspension in the step (1) is concentrated to 3wt% (the solvent in the suspension is water) by rotary evaporation, and the ...

Embodiment 2

[0051] A method for preparing a liquid crystal film with humidity response characteristics, comprising the steps of:

[0052] (1) Wood fibers (taking coniferous wood as an example) were hydrolyzed in 65wt% sulfuric acid for 60 minutes. After the hydrolysis, deionized water with 10 times the sulfuric acid content was added to terminate the reaction. Centrifuge for 6 minutes under the state of sieve to screen out the cellulose nanocrystal suspension with a certain size, and homogenize the obtained cellulose nanocrystal suspension through a D12 homogenizer for 12 times to obtain cellulose nanocrystals with uniform size; The size of cellulose nanocrystals is 300-550nm;

[0053] (2) Using water to prepare 2wt% and 25wt% glycerin solutions respectively, let stand overnight, and set aside;

[0054] (3) The cellulose nanocrystal suspension in step (1) is concentrated to 3wt% by rotary evaporation, and the glycerol solution of 2wt% in step (2) is at room temperature according to the m...

Embodiment 3

[0058] A method for preparing a liquid crystal film with humidity response characteristics, comprising the steps of:

[0059] (1) Wood fibers (taking coniferous wood as an example) were hydrolyzed in 62wt% sulfuric acid for 70 minutes. After the hydrolysis, deionized water with 10 times the sulfuric acid content was added to terminate the reaction. Centrifuge for 6 minutes under the state of sieve to screen out the suspension of cellulose nanocrystals with a certain size. Homogenize the obtained cellulose nanocrystal suspension through a homogenizer with a specification of D12 for 15 times to obtain cellulose nanocrystals with uniform size; the size of the cellulose nanocrystals is 260-500nm;

[0060] (2) Using water to prepare 3wt% and 22wt% glycerin solutions respectively, leave it to stand overnight, and stand-by;

[0061] (3) The cellulose nanocrystal suspension in step (1) is concentrated to 3wt% by rotary evaporation, and the glycerol solution of 3wt% in step (2) is at ...

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Abstract

The invention belongs to the technical field of structural color films, and discloses a structural color film with a humidity response characteristic and a preparation method of the structural color film. The method comprises the following steps: 1) uniformly mixing a cellulose nanocrystal suspension and a low-concentration glycerol solution to obtain a mixed solution; wherein the concentration of the low-concentration glycerol solution is 1-3wt%; 2) forming a film from the mixed solution by an evaporation-induced self-assembly method to obtain a cellulose nanocrystal / glycerol liquid crystal film; and 3) coating one surface of the cellulose nanocrystal / glycerol liquid crystal film with a high-concentration glycerol solution, and then covering the surface coated with the high-concentration glycerol solution with a layer of cellulose nanocrystal / glycerol liquid crystal film to obtain a structural color film with a humidity response characteristic; wherein the concentration of the high-concentration glycerol solution is 20-25 wt%. The film has the effects of rapid humidity response and good cyclic response performance, color switching can be rapidly carried out under different humidity, and the reversibility is good; and the method is simple and low in cost.

Description

technical field [0001] The invention belongs to the field of preparation of functional film materials, and in particular relates to a structural color thin film with humidity response characteristics and a preparation method thereof. Background technique [0002] Smart materials with color and structure changes caused by environmental stimuli such as light, humidity, and temperature have important application value in anti-counterfeiting materials, wearable functional materials, and biomaterials. In nature, the colors of many animals and plants will change in response to changes in the environment, in order to achieve the role of information transmission between species. The color of these organisms is also called structural color. The color development of structural color comes from the interaction of periodic arrays of micro-nano structures of photonic crystals (PCs), which can produce colors through optical interference effects. Cuttlefish, for example, are well-known st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B9/00B32B9/04B32B37/00C08J7/06C08J5/18C08L1/02C08K5/053
CPCB32B9/00B32B9/04B32B37/00C08J7/06C08J5/18B32B2037/243B32B2255/24B32B2307/406B32B2307/418B32B2307/716C08J2301/02C08K5/053
Inventor 段承良王斌李金鹏曾劲松陈克复
Owner SOUTH CHINA UNIV OF TECH
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