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A method for preparing broadband reflective film material by nano-zinc oxide film diffusion method

A nano-zinc oxide, thin film diffusion technology, applied in chemical instruments and methods, liquid crystal materials, chemical industry and other directions, can solve problems such as limiting cholesteric liquid crystal, and achieve the effects of abundant sources, low material cost and simple system

Active Publication Date: 2022-03-18
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The narrow wavelength width will limit the application of cholesteric liquid crystals in the ultraviolet, visible, and infrared regions.

Method used

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  • A method for preparing broadband reflective film material by nano-zinc oxide film diffusion method
  • A method for preparing broadband reflective film material by nano-zinc oxide film diffusion method
  • A method for preparing broadband reflective film material by nano-zinc oxide film diffusion method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Fabrication of the liquid crystal cell: place the cleaned ITO (indium tin oxide) glass in a drying oven at 60° C. for 3 hours to dry. Get the nano-zinc oxide dispersion (≥30%, 90nm, solvent: 1,2-propylene glycol monomethyl ether acetate) and drop it on the ITO glass substrate, use a glue homogenizer to coat the ITO glass, the initial speed is 600r / min, spin The coating time is 6s, the high speed is 2000r / min, and the spin coating time is 30s. Afterwards, the glass substrate coated with the nano-zinc oxide film is heat-treated at a temperature of 60°C for 60 minutes to obtain a nano-zinc oxide film glass substrate. Combine the nano-zinc oxide film glass substrate with a piece of ITO glass substrate, use a PET film with a thickness of 55 μm as a spacer, seal the edges on both sides with glue, and leave the filling inlet, that is, prepare a nano-zinc oxide film on one side LCD box.

[0027] Mix the nematic liquid crystal SLC1717, the chiral compound R811, the polymerizabl...

Embodiment 2

[0037] Mix the nematic liquid crystal SLC1717, the chiral compound R811, the polymerizable monomer C6M and the photoinitiator Irg651 (benzil dimethyl ketal) in a mass ratio of 79.9:9.8:9.8:0.5, and use a siphon to The effect is poured into a liquid crystal cell containing a nano-zinc oxide film on one side.

[0038] The sample compounded in Example 2 was poured into a liquid crystal cell containing a nano-zinc oxide film on one side. The thickness of the liquid crystal cell was 55 μm, and the liquid crystal cell was irradiated with ultraviolet light at 40° C. The degree is 0.8mW / cm 2 The 365nm ultraviolet light was irradiated for 60 minutes to obtain sample 2, so that the polymerizable monomers were cured and crosslinked to form a network, and the final polymer network cholesteric liquid crystal film was obtained. The reflection band of the film at room temperature was 1174nm-1738nm. The transmission spectrum of the sample prepared by the above method can be measured at room ...

Embodiment 3

[0040] Mix the nematic liquid crystal SLC1717, the chiral compound R811, the polymerizable monomer C6M and the photoinitiator Irg651 (benzil dimethyl ketal) in a mass ratio of 77.9:9.8:11.8:0.5, and use a siphon at room temperature to The effect is poured into a liquid crystal cell containing a nano-zinc oxide film on one side.

[0041] The sample compounded in Example 3 was poured into a liquid crystal cell containing a nano-zinc oxide film on one side. The thickness of the liquid crystal cell was 55 μm. The liquid crystal cell was irradiated with ultraviolet light at 40° C. 1.2mW / cm 2 The 365nm ultraviolet light was irradiated for 60 minutes to obtain sample 3, so that the polymerizable monomers were cured and crosslinked to form a network, and the final polymer network cholesteric liquid crystal film was obtained. The transmission spectrum of the sample can be measured at room temperature using an ultraviolet-visible-near-infrared spectrophotometer (Jasco V-570), and the r...

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Abstract

The invention provides a method for preparing a wide-wave reflective thin film material by a nano-zinc oxide thin film diffusion method. Nematic liquid crystals, chiral compounds, polymerizable monomers, and photoinitiators are uniformly mixed according to a certain mass ratio to prepare a cholesteric liquid crystal composite system with a specific pitch. Spin-coat the nano-zinc oxide particle dispersion on indium tin oxide (ITO) glass through a homogenizer to prepare a glass substrate containing a nano-zinc oxide film, and combine the inner side of the nano-zinc oxide film with the ITO glass substrate to form a single-sided Liquid crystal cell containing nano-zinc oxide film. The cholesteric liquid crystal composite system is poured into the liquid crystal cell by siphon action. Place the film side of the liquid crystal cell on the hot stage, and the nano-zinc oxide particles will diffuse into the liquid crystal cell. Using the characteristics of nano-zinc oxide to absorb ultraviolet light, ultraviolet rays will be formed in the thickness direction of the liquid crystal cell through the irradiation of ultraviolet light. The gradient of light intensity causes the consumption rate of free radical polymerization monomer to be different, thus inducing the gradient distribution of pitch in the system.

Description

technical field [0001] The invention belongs to the application field of functional materials and provides a method for preparing broadband reflective thin film materials by using a nanometer zinc oxide thin film diffusion method. The material can be widely used in the fields of light-enhancing films, gratings, laser protection, optical devices, sensors, and the like. Background technique [0002] Liquid crystals are partially ordered anisotropic liquids, which are between three-dimensional ordered solids and isotropic liquids. They can flow like liquids or have isotropic ordered arrangements like crystals. The centroid of the liquid crystal molecules is disordered (the crystal is ordered), and its director is ordered (the ordinary liquid is disordered), so the liquid crystal is an optically anisotropic substance sensitive to external fields. Because of this special structure, liquid crystals can modulate light, and thus are widely used in the display field. The cholesteri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K19/52C08F122/14G02B5/08G02F1/1335
CPCC09K19/52G02B5/0808G02F1/133553C08F122/14C09K2019/521Y02P20/10
Inventor 曹晖甘萍赵立敏史玮婷张学涛韩锐杨洲王冬何万里
Owner UNIV OF SCI & TECH BEIJING
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