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Method for preparing wide-wave reflection film based on ZIFs bidirectional diffusion method

A two-way diffusion, thin film technology, applied in instruments, optical components, optics, etc., can solve the problems of difficulty in adjusting the wavelength and narrow wavelength, and achieve the effect of simple system, simple preparation process, and easy access to experimental materials.

Active Publication Date: 2022-06-28
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, since the birefringence of cholesteric liquid crystal materials is generally less than 0.4, the wavelength width of incident light selectively reflected by single-pitch cholesteric liquid crystals is relatively narrow (generally less than 100nm), it is difficult to adjust the wave width by adjusting the birefringence

Method used

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  • Method for preparing wide-wave reflection film based on ZIFs bidirectional diffusion method
  • Method for preparing wide-wave reflection film based on ZIFs bidirectional diffusion method
  • Method for preparing wide-wave reflection film based on ZIFs bidirectional diffusion method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0026] Production of liquid crystal cell: Cut the glass coated with indium tin oxide on one side into a size of 2cm×3cm, wash it twice with washing powder, clean water, deionized water and ethanol each, place it in a clean glass petri dish, and dry it for later use. Weigh 100 mg of ZIF-8 in a round-bottomed flask containing 100 ml of methanol with magnetic stirring and ultrasonication for 1 hour. After standing for 12 hours, it was centrifuged, washed and filtered with methanol. . Put the processed ZIF-8 into an ampoule, then connect the vacuum pump through the connector, and use the vacuum pump to draw out the air, so that the inside of the device is in a vacuum state for 10 minutes. Weigh 120 mg of the chiral dopant R5011 and 60 mg of the ultraviolet absorbing dye UV-327, respectively add them into two 20 mL portions of ethyl acetate to obtain a mixed solution, and use ultrasonic vibration to mix uniformly. Then two parts of 40 mg of vacuum-treated ZIF-8 were placed in the ...

Embodiment example 2

[0042] Production of liquid crystal cell: The ZIF-8 / R5011 composite material and the ZIF-8 / UV-327 composite material in Example 1 were mixed with methanol to prepare a 6 mg / ml mixed solution and mixed uniformly. 0.1ml of the mixed solution was evenly drop-coated on the treated glass substrate. After the drop-coating, it was dried on a hot table and evaporated to obtain a composite film containing ZIF-8 / UV-327 and ZIF-8 / R5011. Material thin glass substrate. Then, the liquid crystal cell was assembled in the same manner as in Example 1, and then stored in a 60° C. oven.

[0043] Sample 2 was obtained according to the mass ratio and diffusion and polymerization conditions of the liquid crystal system in Example 1, and the polymerizable monomer was cured and crosslinked to form a network to obtain the final polymer network cholesteric liquid crystal film. The transmission spectrum of the sample can be measured at room temperature using an ultraviolet-visible-near-infrared spectro...

Embodiment example 3

[0045] Production of liquid crystal cell: The ZIF-8 / R5011 composite material and the ZIF-8 / UV-327 composite material in Example 1 were mixed with methanol to prepare a mixed solution of 8 mg / ml and mixed uniformly. 0.1ml of mixed solution was evenly drop-coated on the treated glass substrate, used after drip-coating, dried on a hot table, and after volatilizing the solvent, a film containing ZIF-8 / UV-327 composite material and ZIF-8 / R5011 composite material were prepared. Material thin glass substrate. Then, the liquid crystal cell was assembled in the same manner as in Example 1, and then stored in a 60° C. oven.

[0046] Sample 3 was obtained according to the mass ratio of the liquid crystal system and the polymerization conditions in Example 1, and the polymerizable monomer was cured and crosslinked to form a network to obtain the final polymer network cholesteric liquid crystal film. The transmission spectrum of the sample can be measured at room temperature using an ultr...

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Abstract

The invention discloses a method for preparing a wide-wave reflection film based on a ZIFs bidirectional diffusion technology. And coating the ZIFs particle loaded chiral compound and the loaded ultraviolet absorption dye on a glass substrate, and drying to prepare a ZIFs / chiral compound composite material film and a ZIFs / ultraviolet absorption dye composite material film. The glass substrates attached with the two films serve as the two sides of the liquid crystal box, and the liquid crystal box with the upper side containing the ZIFs / ultraviolet absorption dye composite material film and the lower side containing the ZIFs / chiral compound composite material film is manufactured. Nematic liquid crystals, polymerizable monomers, chiral dopants and photoinitiators are uniformly mixed, and a prepared cholesteric liquid crystal composite system is poured into a liquid crystal box. The liquid crystal box is placed on a heating stage, the chiral compound and the ultraviolet absorption dye can be bidirectionally diffused into the liquid crystal box, the ultraviolet light intensity gradient can be formed in the thickness direction of the liquid crystal box through irradiation of ultraviolet light, the consumption rates of free radical polymerization monomers are different, gradient distribution of screw pitches is induced in a system, and the chiral compound and the ultraviolet absorption dye are dispersed in the liquid crystal box. And the selective reflection wave width of 1300nm can be realized.

Description

technical field [0001] The invention belongs to the application field of functional materials, and prepares a liquid crystal material for realizing wide-wave reflection of optical film materials, which can be widely used in the preparation of liquid crystal display light shielding films, energy-saving architectural glass, laser protection and near-infrared light shielding films. Background technique [0002] Selective reflection of cholesteric phase is a unique optical characteristic that distinguishes cholesteric liquid crystal from other liquid crystal phases, and it is also one of the important optical properties of cholesteric liquid crystal, which has been a research hotspot of widespread concern. The cholesteric liquid crystal whose reflection wavelength is in the visible light band is used in mobile information tools, e-books and other small-sized display devices. It does not need to configure a backlight. It can realize color display by reflecting natural light, which...

Claims

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Application Information

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IPC IPC(8): C08F122/20C08F2/44C08F2/48C08K5/10C08K9/12C08K5/156C08K5/3475C08J5/18C08L35/02G02B5/08G02B1/04
CPCC08F122/1006C08F2/44C08F2/48C08K5/101C08K9/12C08K5/156C08K5/3475C08J5/18G02B5/0808G02B1/04C08J2335/02
Inventor 曹晖韩锐张学涛李慧赵晓辉杨洲王冬何万里
Owner UNIV OF SCI & TECH BEIJING
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