Liquid crystal material applied to multi-response-mode smart window and application thereof

Patent metadata

Field	Value
Publication number	US-12359129-B2
Application number	US-202418741310-A
Country	US
Kind code	B2
Filing date	Jun 12, 2024
Priority date	Feb 20, 2023
Publication date	Jul 15, 2025
Grant date	Jul 15, 2025

Abstract

Provided is a liquid crystal material applied to a multi-response-mode smart window and an application thereof. The present disclosure relates to a liquid crystal material and an application thereof. The problem of high drive voltage of the liquid crystal smart window based on dynamic scattering mode in the prior arts can be solved. The liquid crystal material applied to the multi-response-mode smart window is formed by mixing a dichroic dye, an ionic dopant and a liquid crystal. It is applied to preparing an electrohydrodynamics liquid crystal dimming device which is capable of switching among transparent state, light-absorbing state and scattering state under a drive voltage of 5V to 50V and a drive frequency of 1 Hz to 5 kHz.

First claim

What is claimed is:

1. A liquid crystal material applied to a multi-response-mode smart window, wherein, the liquid crystal material applied to the multi-response-mode smart window is formed by mixing a dichroic dye, an ionic dopant, and a liquid crystal;
the ionic dopant is a combination of a cationic surfactant and an anionic surfactant, wherein a weight ratio of the cationic surfactant to the anionic surfactant is 1:(0.1 to 10).

2. The liquid crystal material of claim 1 , wherein the cationic surfactant is formed by mixing one or more of cetyltrimethylammonium bromide, benzyldimethylhexadecylammonium chloride and tetrabutylammonium bromide; the anionic surfactant is formed by mixing one or more of sodium dodecyl sulfate, sodium stearate and decyltrimethylammonium chloride.

3. The liquid crystal material of claim 1 , wherein the dichroic dye is a non-ionic azo dye.

4. The liquid crystal material of claim 3 , wherein the non-ionic azo dye is Sudan black B.

5. The liquid crystal material of claim 1 , wherein the liquid crystal is a negative dielectric anisotropic rod-shaped liquid crystal.

6. The liquid crystal material of claim 5 , wherein the negative dielectric anisotropic rod-shaped liquid crystal is E7.

7. The liquid crystal material of claim 1 , wherein a weight percentage of the dichroic dye in the liquid crystal material applied to the multi-response-mode smart window is 0.1% to 2%.

8. The liquid crystal material of claim 1 , wherein a weight percentage of the ionic dopant in the liquid crystal material applied to the multi-response-mode smart window is 0.001% to 5%.

9. The liquid crystal material of claim 1 , wherein the liquid crystal material applied to the multi-response-mode smart window is formed by mixing the dichroic dye, the ionic dopant and the liquid crystal at the temperature of 70° C. to 120° C.

10. An application of the liquid crystal material applied to the multi-response-mode smart window as mentioned in claim 1 , wherein the liquid crystal material is applied to preparing an electrohydrodynamic liquid crystal dimming device which is capable of switching among transparent state, light-absorbing state and scattering state under a drive voltage of 5V to 50V and a drive frequency of 1 Hz to 5 kHz; and a thickness of a liquid crystal cell of the electrohydrodynamic liquid crystal dimming device is greater than 5 μm.

Assignees

• Harbin Inst Technology

Inventors

• Zhu Jiaqi
• Zhang Ruicong
• Wang Tianyu
• He Yurong
• Zhang Zhibo
• Li Jiajun
• Song Zicheng
• Yang Lei

Classifications

• G02F1/13306 Primary

  Circuit arrangements or driving methods for the control of single liquid crystal cells (G02F1/132, G02F1/133382 take precedence) · CPC title

• C09K2019/528

  Surfactants · CPC title

• C09K19/601

  Azoic · CPC title

• C09K19/60

  Pleochroic dyes · CPC title

• G02F1/13725

  based on guest-host interaction (G02F1/13762, G02F1/13737, take precedence) · CPC title