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A method for preparing broadband reflective cholesteric liquid crystal thin films by photothermal response technology

A cholesteric liquid crystal, photothermal response technology, used in optics, nonlinear optics, instruments, etc., to achieve the effects of low price, excellent photothermal conversion performance, and flexible heating methods

Active Publication Date: 2021-08-27
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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  • A method for preparing broadband reflective cholesteric liquid crystal thin films by photothermal response technology
  • A method for preparing broadband reflective cholesteric liquid crystal thin films by photothermal response technology
  • A method for preparing broadband reflective cholesteric liquid crystal thin films by photothermal response technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Production of the 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 twice, once with deionized water and ethanol, and place it in a clean glass petri dish. Wait for the glass to dry naturally. Dissolve 4g of polyvinyl alcohol in 200mL of water, heat to 90°C to dissolve, and 84mg of copper dichloride hydrate (CuCl 2 .2H 2 O) was dissolved in 40mL water, and the resulting solution was added into the polyvinyl alcohol solution under stirring, and stirred for 4h to make it fully complexed; 41.56mg of anhydrous sodium sulfide (Na 2 S) Dissolve in 20 mL of water, add the obtained solution into the reaction system, and react for 15 minutes to obtain a light green aqueous solution of polyvinyl alcohol-modified copper sulfide nanoparticles. Drop-coat 0.25mL of the prepared polyvinyl alcohol-modified copper sulfide nanoparticle solution on a glass slide, and dry it on a hot table at...

Embodiment 2

[0036] Using the same liquid crystal cell manufacturing process and sample formula as 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 adjust the intensity of the near-infrared laser to 0.5-2.4W / cm 2 , stay at each intensity for 1min, a total of 20min. In this 20min, the use intensity is 0.5mW / cm 2 The ultraviolet light is irradiated on the sample 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 as 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 adjust the intensity of the near-infrared laser to 0.5-2.4W / cm 2 , stay at each intensity for 1min, a total of 20min. In this 20min, the use intensity is 1mW / cm 2 The ultraviolet light is irradiated on the sample 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 discloses a method for preparing broadband reflective cholesteric liquid crystal film by photothermal response technology. Copper sulfide nanoparticles modified by polyvinyl alcohol were first synthesized, and the nanoparticle aqueous solution was drip-coated on a glass substrate and dried on a hot stage to make a photothermal film, and the glass substrate with this photothermal film was used as a liquid crystal One side of the cell is made into a liquid crystal cell with photothermal response performance to the near-infrared light band. Mix nematic liquid crystal, chiral compound, polymerizable monomer, and photoinitiator uniformly according to a certain mass ratio to obtain cholesteric liquid crystal, pour it into the prepared liquid crystal cell with photothermal response performance, and place it in the near-infrared laser Under the irradiation, the sample is irradiated with ultraviolet light at the same time, so that the polymerizable monomer is polymerized during the heating process, and broadband reflection is realized. The preparation method of the copper sulfide nanoparticles modified by polyvinyl alcohol and the liquid crystal cell with photothermal response performance of the present invention is simple, and different heating speeds can be realized by modulating the intensity of the near-infrared laser, and has the advantages of strong flexibility and low 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 a near-infrared band photothermal response technology. Background technique [0002] Based on the circular dichroism and selective reflection of cholesteric liquid crystal, it has many applications in production, such as reflective display, optical fiber communication, integrated optical circuit, biosensing, laser radiation and many other fields. Among them, cholesteric liquid crystals that can reflect visible light are widely used in mobile information tools, small-sized display devices, e-books and other fields, because they do not need a backlight during use, and they can reflect natural light to present 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 increase the brightness, thereby r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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