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Photothermal Dual Passively Driven Liquid Crystal Smart Window.

Weihao Meng1,2, Yingtao Gao1,2, Xiaowen Hu3

  • 1CAS Key Laboratory of Bio-inspired Materials and Interfaces Sciences, Technique Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China.

ACS Applied Materials & Interfaces
|June 13, 2022
PubMed
Summary

This study introduces a novel dual-driven smart window using a photothermal molecule (IDI) in liquid crystals. This innovation allows windows to adjust light transmittance based on both temperature and light intensity for energy efficiency.

Keywords:
isobutyl-substituted diimmonium borateliquid crystalphase transitionphotothermal conversionsmart window

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Energy

Background:

  • Smart windows offer dynamic control over light transmittance.
  • Current liquid crystal (LC) smart windows face challenges in simultaneous light and temperature modulation.
  • Developing efficient photothermal materials is crucial for advanced smart window applications.

Purpose of the Study:

  • To develop a novel photothermal dual-driven smart window.
  • To investigate the use of isobutyl-substituted diimmonium borate (IDI) as a photothermal material in chiral LC mixtures.
  • To demonstrate simultaneous transmittance modulation by light and temperature.

Main Methods:

  • Doping chiral liquid crystal (LC) mixtures with the photothermal molecule IDI.
  • Characterizing the photothermal properties and LC phase transitions of the doped system.
  • Evaluating the smart window's transmittance modulation under varying temperature and light intensity conditions.

Main Results:

  • The developed smart window exhibits efficient transmittance modulation (70% to 20%) based on ambient conditions.
  • IDI demonstrates excellent photothermal effect, transparency, and compatibility within the LC system.
  • The smart window transitions between transparent (homeotropically oriented smectic phase) and opaque (focal conic cholesteric phase) states.

Conclusions:

  • A novel photothermal dual-driven smart window was successfully developed using IDI-doped chiral LC mixtures.
  • The smart window offers promising applications for energy saving and personalized privacy.
  • This technology enables efficient light transmittance control in response to simultaneous environmental stimuli.