Liquid crystal mixture and temperature-responsive infrared reflection device

Patent metadata

Field	Value
Publication number	US-11168256-B2
Application number	US-201816604371-A
Country	US
Kind code	B2
Filing date	Oct 10, 2018
Priority date	Oct 17, 2017
Publication date	Nov 9, 2021
Grant date	Nov 9, 2021

Abstract

A liquid crystal mixture and a temperature-responsive infrared reflection device made by using the liquid crystal mixture containing potassium laurate. Infrared light can pass through the device within a non-working temperature range, and a chiral dopant enables potassium laurate to form a cholesteric phase within a working temperature range. The birefringence value of the potassium laurate gradually increases with the increase of temperature between 12.5° C. and 26° C., so that the infrared reflection bandwidth of the device constantly increases. The birefringence value of the potassium laurate gradually decreases with the increase of temperature between 26° C. and 54.5° C., so that the infrared reflection bandwidth of the device constantly decreases. The infrared reflection bandwidth of the infrared reflection device can vary with temperature by adjusting the proportions of the ingredients of the liquid crystal mixture containing potassium laurate.

First claim

What is claimed is:

1. A liquid crystal mixture, comprising:
24.03 to 28.9 parts by weight of potassium laurate;
5.7 to 7.3 parts by weight of heavy water;
59.8 to 69.2 parts by weight of organic alcohol; and
2.71 to 2.83 parts by weight of chiral dopant.

2. The liquid crystal mixture of claim 1 , wherein the organic alcohol is one selected from the group consisting of n-decanol, iso-decanol and n-octanol.

3. The liquid crystal mixture of claim 1 , wherein the chiral dopant has the structural formula

4. A temperature-responsive infrared reflection device, comprising the liquid crystal mixture of claim 1 .

5. The temperature-responsive infrared reflection device of claim 4 , wherein the temperature-responsive infrared reflection device is capable of performing infrared reflection at 12.5° C. to 54.5° C.

Assignees

• Univ South China Normal
• Shenzhen Guohua Optoelectronics Co Ltd
• Acad Shenzhen Guohua Optoelectronics

Inventors

• Zhou Guofu
• Hu Xiaowen
• Zhao Wei
• Zeng Weijie
• Ju Chun
• Shui Lingling

Classifications

• G02B5/26

  Reflecting filters (G02B5/28 takes precedence) · CPC title

• C09K19/586

  Optically active dopants; chiral dopants · CPC title

• C07C53/126 Primary

  Acids containing more than four carbon atoms · CPC title

• G02F1/132

  Thermal activation of liquid crystals exhibiting a thermo-optic effect · CPC title

• C09K19/52

  characterised by components which are not liquid crystals, e.g. additives {with special physical aspect: solvents, solid particles} · CPC title