Preparation method for nano particle and stable blue phase liquid crystal compound material

A blue-phase liquid crystal and nanoparticle technology, applied in liquid crystal materials, chemical instruments and methods, etc., can solve problems such as the difficulty of recovery of small-molecule blue-phase liquid crystals, and achieve the effects of fast electric field response speed, remarkable effect, and simple preparation.

Inactive Publication Date: 2012-07-18
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the main obstacle that currently limits the practical application of blue-phase liquid crystals in devices is that small-molecule blue-phase liquid crystals are difficult to recover under strong electric fields.

Method used

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  • Preparation method for nano particle and stable blue phase liquid crystal compound material
  • Preparation method for nano particle and stable blue phase liquid crystal compound material
  • Preparation method for nano particle and stable blue phase liquid crystal compound material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] step one

[0024] Preparation and surface modification of ZnS nanoparticles: surfactant Triton X-100 (TritonX-100) is added in cyclohexane; In cyclohexane, under magnetic stirring, slowly add n-butanol dropwise until the solution is clear, that is, a thioacetamide microemulsion is formed; measure zinc acetate solution equivalent to thioacetamide, and prepare zinc acetate by the above method Microemulsion. Mix the prepared thioacetamide microemulsion and zinc acetate microemulsion, stir evenly with magnetic force, control a certain reaction temperature, and react for 6 hours under the action of ultrasonic waves to obtain a light yellow emulsion. Ethanol is added to the emulsion by rotary evaporation to break the emulsion, centrifuged, washed with water and ethanol twice respectively, and dried in vacuum to obtain nanometer ZnS particles. Spherical ZnS nanoparticles with a modified surface and an average particle diameter of about 33 nm are selected for use.

[0025] s...

Embodiment 2

[0037] step one

[0038] Preparation and surface modification of ZnO nanoparticles: The polytetrafluoroethylene lining of the hydrothermal reactor was peeled and weighed, and the oleic acid was sucked into the lining with a dropper. Use this method to weigh 0.353g (1.25mmol) of oleic acid into the lining, put it into a 50mL hydrothermal reaction kettle, and then dissolve sodium hydroxide and zinc acetate dihydrate (ratio of substances: 2:1) in a certain amount Add the water into the hydrothermal reaction kettle, and keep stirring, then seal the kettle, put it in a dry box, raise the temperature to 130 ° C, and react for 4 hours; after the reaction is completed, let the reaction kettle naturally cool to room temperature, and remove After recovery, the solid in the lower layer was washed with distilled water and ethanol, and dried naturally to obtain zinc oxide nanoparticles with an average particle size of about 15 nm.

[0039] step two

[0040] Preparation of wide temperatur...

Embodiment 3

[0047] step one

[0048] Preparation and surface modification of CdS nanoparticles: In 100 mL of distilled water, add 1 g of sodium dodecyl sulfate for ultrasonic dispersion to dissolve it, dissolve 5 mmol of Cd(NO3)2·4H2O in the above aqueous solution, add 7 mmol of TAA, and place in a 250 mL circle In the bottom flask, connect the reflux tube, use 20% power (indicates that in each 30s working cycle, work for 6s, stop for 24s, and the total power remains unchanged, still 650W) microwave reaction for 20min, naturally cool to room temperature, centrifuge Separate, wash several times with distilled water and acetone, and dry naturally; that is, CdS nanoparticles are obtained, and the average particle diameter is about 6nm.

[0049] step two

[0050] Preparation of wide temperature range blue phase liquid crystal: the composition of wide temperature range blue phase liquid crystal used in the present invention is 82.0wt% mixed crystal SLC-X (Yongsheng Huatsing Liquid Crystal Co....

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Abstract

The invention provides a preparation method for a nano particle and stable blue phase liquid crystal compound material. According to the method, inorganic nano particles which have different particle diameters, and are subjected to surface modification, and of which the dipole moment is 50 to 150d, such as ZnS particles, ZnO particles, GdS particles, GdSe particles and the like are added into a blue phase liquid crystal with a wide temperature range in a certain proportion, so that the blue phase liquid crystal can be restored reversibly under the action of highfield, and meanwhile, the temperature range of the blue phase can be widened to certain extent. The nano particle and stable blue phase liquid crystal compound material is easy to prepare, and has an obvious effect, and the prepared system is high in stability and low in viscosity, and can quickly respond to an electric field.

Description

technical field [0001] The invention belongs to the field of liquid crystal materials and displays, and relates to blue-phase liquid crystal materials and inorganic nano-materials, in particular to adding nano-particles with different particle diameters and surface modification to blue-phase liquid crystals with a wide temperature range in a certain proportion to obtain Realize the reversible recovery of the blue phase liquid crystal under the action of a strong electric field, and at the same time broaden the temperature range of the blue phase to a certain extent, so as to prepare new liquid crystal display devices and optical devices for fast display. Background technique [0002] Blue phases (Liquid crystalline Blue Phases, BPs) are macroscopically a special phase state between the isotropic state and the cholesteric phase, and often appear in high-chiral liquid crystal systems. Microscopically, the blue phase is a lattice defect phase without birefringence, and its latt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/52
Inventor 杨槐王玲何万里王丽萍王萌孟凡国
Owner UNIV OF SCI & TECH BEIJING
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