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A liquid crystal composite material, preparation method and liquid crystal handwriting device thereof

A technology of liquid crystal handwriting and composite materials, applied in the direction of liquid crystal materials, chemical instruments and methods, instruments, etc., to achieve the effect of realizing magneto-optical effect, increasing sensitivity, and realizing full and partial magnetic erasure

Active Publication Date: 2022-01-11
JIANGSU JICUI INTELLIGENT LCD TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional liquid crystal writing device still needs an electric field to drive the liquid crystal molecules to perform steady-state conversion, and can only perform full erasing, and the partial erasing function is still an insurmountable technical obstacle.

Method used

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  • A liquid crystal composite material, preparation method and liquid crystal handwriting device thereof
  • A liquid crystal composite material, preparation method and liquid crystal handwriting device thereof
  • A liquid crystal composite material, preparation method and liquid crystal handwriting device thereof

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Experimental program
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Effect test

preparation example Construction

[0040] Such as Figure 6 As shown, the preparation method of the liquid crystal composite material includes: preparing anisotropic magnetic particles, then surface-modifying the obtained anisotropic magnetic particles, and finally dispersing the surface-modified anisotropic magnetic particles in the cholesteric liquid crystal material , thus forming a liquid crystal composite material. According to the different materials and shapes of anisotropic magnetic particles, there are many preparation methods, mainly including: thermal decomposition method, sol-gel method, co-precipitation method, microwave-assisted synthesis method and hydrothermal synthesis method. The surface of the particles can be modified with surfactants, lipids, or silane coupling agents to ensure that the cholesteric liquid crystal molecules are oriented in a preset direction near the surface of the particles, and at the same time, the anisotropic magnetic particles can be stabilized in the liquid crystal mat...

Embodiment 1

[0043] Embodiment 1: scandium doped barium iron oxide (Ba x sc y Fe z o 19 ) Preparation, cleaning and surface modification of nanosheets

[0044] Weigh an appropriate amount of barium nitrate, iron nitrate, and scandium nitrate according to the following table, and the molar ratio is n Ba :n Fe :n Sc =1:4.5:0.5, add to 100 ml of hydrothermal reaction dish, then add deionized water accounting for 60% of the total capacity of the container in the reaction dish, stir evenly until the nitrate is completely dissolved, so that the total nitrate ion in the solution The concentration is about 0.1M. Weigh 3.84g of sodium hydroxide, add it into the nitrate solution, stir rapidly until the sodium hydroxide is completely dissolved, and the molar ratio of hydroxide ions to nitrate ions in the solution is 16. Add 15.28 mg of surfactant DBSa. The mass of the surfactant should be 10% of the theoretical mass of the synthesized nanosheets. Close the hydrothermal reaction vessel, put i...

Embodiment 2

[0049] Example 2: Preparation of oleic acid-coated nanorods

[0050] Weigh 9.125 grams of sodium oleate and 2.7 grams of ferric chloride hexahydrate, and add them into the flask, and add 20 milliliters of ethanol, 15 milliliters of deionized water, and 15 milliliters of n-hexane. After fully dissolving the reactant, it was heated to 70° C. and refluxed for 4 hours. Naturally cooled to room temperature, the upper n-hexane solution was separated with a pear-shaped separatory funnel, washed with deionized water / ethanol mixed solution for 3 times, and then dried with a rotary evaporator. The obtained concentrate was vacuum-dried at 70° C. for 24 hours to obtain an oily iron (II) oleate complex. Afterwards, the dried iron(II) oleate complex and sodium oleate were dissolved in dibenzyl ether at a molar ratio of 1:1, and the concentration was 0.2M. Then the temperature was raised at a rate of 3.5° C. per minute for 1 hour, and the reaction system was cooled to room temperature afte...

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Abstract

The invention discloses a liquid crystal composite material. The liquid crystal composite material comprises: cholesteric liquid crystal and anisotropic magnetic particles dispersed in the cholesteric liquid crystal, wherein the anisotropic magnetic particle can change with an external magnetic field Orientation, to further change the molecular orientation of the cholesteric liquid crystal, so that the performance of the liquid crystal composite material changes with the external magnetic field. The invention also discloses a method for preparing the liquid crystal composite material and a liquid crystal handwriting device using the liquid crystal composite material. In the present invention, the liquid crystal composite material is formed by doping anisotropic magnetic particles in the cholesteric liquid crystal, which can not only increase the sensitivity of the cholesteric liquid crystal to the magnetic field, realize the magneto-optical effect of the cholesteric liquid crystal under low magnetic field, but also can Realize the transition of the liquid crystal composite material from reflection to weak scattering state, and realize the magnetic erasing function of the liquid crystal handwriting device.

Description

technical field [0001] The invention relates to a liquid crystal composite material, in particular to a magnetically controlled liquid crystal composite material. The invention also relates to a method for preparing the liquid crystal composite material and a liquid crystal handwriting device using the liquid crystal composite material. Background technique [0002] As a fluid anisotropic material, liquid crystals are easily stimulated by external forces such as electric fields, magnetic fields, heat, and mechanical forces to change the alignment of molecules, thereby realizing its adjustment to light. Among them, liquid crystal materials have been widely used in the display field because of their excellent electro-optic effect, which can achieve high-definition and high-capacity fast response effects, forming a mature liquid crystal display industry. However, this kind of liquid crystal display material driven by electricity is bound to bring problems such as complicated p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/1333G02F1/13C09K19/52
Inventor 崔淑贞帅敏安然薛九枝
Owner JIANGSU JICUI INTELLIGENT LCD TECH CO LTD
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