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Updated: Dec 28, 2025

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Normally Transparent Tribo-Induced Smart Window.

Jiaqi Wang1,2, Cuiling Meng3, Qian Gu1,4

  • 1Department of Mechanical and Automation Engineering, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China.

ACS Nano
|February 21, 2020
PubMed
Summary

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This summary is machine-generated.

This study introduces a self-powered smart window that harvests mechanical energy. It combines a rotary freestanding sliding triboelectric nanogenerator (RFS-TENG) with a polymer network liquid crystal (PNLC) cell for weather-independent, user-controlled opacity.

Area of Science:

  • Materials Science
  • Energy Harvesting
  • Smart Materials

Background:

  • Traditional smart windows often rely on weather-dependent solar or thermal power, limiting their performance and energy utilization.
  • Existing systems face challenges with slow response times and inefficient energy management for mode conversion.

Purpose of the Study:

  • To develop a self-powered smart window with improved energy efficiency and user control.
  • To integrate a triboelectric nanogenerator with a liquid crystal cell for autonomous operation.

Main Methods:

  • Fabrication of a polymer network liquid crystal (PNLC) cell with randomly distributed microdomains for enhanced opacity.
  • Integration of a rotary freestanding sliding triboelectric nanogenerator (RFS-TENG) for mechanical energy harvesting.
Keywords:
liquid crystalspolymer network liquid crystalsself-powered smart windowstriboelectric nanogeneratorsultrahigh haziness

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  • Utilizing the TENG's output to drive the PNLC cell for opacity control.

    • Main Results:

    • The developed smart window demonstrates self-powered operation, harvesting ambient mechanical energy.
    • The PNLC cell achieves significantly improved opacity due to embedded microdomains and LC polymer networks.
    • The RFS-TENG provides sufficient power for LC actuation, enabling steady opacity control.

    Conclusions:

    • A novel self-powered smart window integrating RFS-TENG and PNLC technologies has been successfully demonstrated.
    • This technology offers a weather-independent, energy-saving solution for smart windows.
    • Potential applications include self-powered sunroofs and wind-driven smart systems.