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Method for preparing wide-wave reflection cholesteric liquid crystal film by photo-thermal response technology

A cholesteric liquid crystal, photothermal response technology, applied in optics, nonlinear optics, instruments, etc., to achieve excellent photothermal conversion performance, flexible heating method, and low price

Active Publication Date: 2021-03-02
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the light-to-heat conversion effect of inorganic nanoparticles has not been combined with the subject of broad-wave reflection of cholesteric liquid crystals.

Method used

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  • Method for preparing wide-wave reflection cholesteric liquid crystal film by photo-thermal response technology
  • Method for preparing wide-wave reflection cholesteric liquid crystal film by photo-thermal response technology
  • Method for preparing wide-wave reflection cholesteric liquid crystal film by photo-thermal response technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026]The production of the liquid crystal cell: Cut one side of the glass coated with indium tin oxide into 2cm×3cm size, and wash it twice with washing powder and water, and once with deionized water and ethanol, and place it in a clean glass petri dish. Wait for the glass sheet to dry naturally. 4g polyvinyl alcohol was dissolved in 200mL water, heated to 90℃ to dissolve it, 84mg copper dichloride hydrate (CuCl2.2H2O) Dissolve in 40mL water, add the resulting solution to the polyvinyl alcohol solution under stirring, and stir for 4h to make it fully complexed; 41.56mg of anhydrous sodium sulfide (Na2S) Dissolve in 20 mL of water, add the resulting solution to the reaction system, and react for 15 minutes to obtain a light green polyvinyl alcohol-modified copper sulfide nanoparticle aqueous solution. Drip 0.25 mL of the prepared polyvinyl alcohol-modified copper sulfide nanoparticle solution on a glass slide, and dry it on a hot stage at 70°C for 15 minutes after the dripping is c...

Embodiment 2

[0036]Using the same liquid crystal cell manufacturing process and sample formula in Example 1, the cholesteric liquid crystal system was poured into the liquid crystal cell. After the system is stable, place the liquid crystal cell under a near-infrared laser with a wavelength of 980nm at a distance of 18cm, and modulate the intensity of the near-infrared laser to 0.5~2.4W / cm2, Each intensity stays for 1 min for a total of 20 min. In these 20mins, the use intensity is 0.5mW / cm2The sample is irradiated with ultraviolet light at the same time, so that the polymerizable monomer C6M in the cholesteric liquid crystal is polymerized to form a network, and the pitch of each temperature section is fixed.

Embodiment 3

[0038]Using the same liquid crystal cell manufacturing process and sample formula in Example 1, the cholesteric liquid crystal system was poured into the liquid crystal cell. After the system is stable, place the liquid crystal cell under a near-infrared laser with a wavelength of 980nm at a distance of 18cm, and modulate the intensity of the near-infrared laser to 0.5~2.4W / cm2, Each intensity stays for 1 min for a total of 20 min. In these 20mins, the use intensity is 1mW / cm2The sample is irradiated with ultraviolet light at the same time, so that the polymerizable monomer C6M in the cholesteric liquid crystal is polymerized to form a network, and the pitch of each temperature section is fixed.

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Abstract

The invention relates to a method for preparing a wide-wave reflection cholesteric liquid crystal film by a photo-thermal response technology. The method comprises the following steps: synthesizing polyvinyl alcohol modified copper sulfide nanoparticles, dispensing the aqueous solution of the nanoparticles on a glass substrate, drying with a heating stage to prepare a photo-thermal film, and taking the glass substrate attached with the photo-thermal film as one side of a liquid crystal box to produce the liquid crystal box with photo-thermal response performance to a near-infrared light band;and uniformly mixing nematic phase liquid crystal, a chiral compound, a polymerizable monomer and a photoinitiator according to a certain mass ratio to obtain cholesteric phase liquid crystal, pouringthe cholesteric phase liquid crystal into a produced liquid crystal box with photo-thermal response performance, irradiating under a near-infrared laser, and irradiating a sample with ultraviolet light at the same time so that the polymerizable monomer is polymerized in a heating process to realize wide-wave reflection. The preparation method of the polyvinyl alcohol modified copper sulfide nanoparticles and the liquid crystal box with the photo-thermal response performance is simple, different heating speeds can be achieved by modulating the intensity of the near-infrared laser, and the method is high in flexibility and low in price.

Description

Technical field[0001]The invention belongs to the application field of functional materials, and provides a method for preparing a broad-wave reflective cholesteric liquid crystal film by using near-infrared waveband photothermal response technology.Background technique[0002]Based on the circular dichroism and selective reflection of cholesteric liquid crystals, it has many applications in production, such as reflective displays, optical fiber communications, integrated optical circuits, biological sensing, laser radiation and many other fields. Among them, the cholesteric liquid crystal that can reflect visible light is widely used in mobile information tools, small-size display devices, e-books and other fields. Because it does not require a backlight during use, it reflects natural light and can show colors, which can save energy. Environmental protection; at the same time, it can be used as a light-enhancing film, which can reflect light to improve brightness, thereby reducing t...

Claims

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Application Information

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IPC IPC(8): G02F1/1333G02F1/137
CPCG02F1/1333G02F1/13718
Inventor 曹晖赵立敏甘萍张学涛史玮婷韩锐杨洲王冬何万里
Owner UNIV OF SCI & TECH BEIJING
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