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Anti-UV Passive Radiative Cooling Chiral Nematic Liquid Crystal Films for Thermal Management.

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Researchers developed a new anti-ultraviolet (anti-UV) film using liquid crystalline polymer for passive radiative cooling (PRC). This film achieves efficient cooling, customizable colors, and transparency, offering advanced thermal management for windows and wearables.

Keywords:
anti‐UVchiral nematic liquid crystalshigh transparencypassive radiative coolingstructural colorsthermal management

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Sustainable Energy

Background:

  • Passive radiative cooling (PRC) offers a sustainable method for heat dissipation to outer space via atmospheric transparent windows.
  • Current PRC films face challenges in balancing transparency, customizable color, and UV protection for effective thermal management.

Purpose of the Study:

  • To develop a novel anti-ultraviolet (anti-UV) film with customizable structural color for enhanced passive radiative cooling.
  • To achieve simultaneous high transparency in the visible spectrum, efficient sunlight reflection, and effective thermal management.

Main Methods:

  • Utilized liquid crystalline polymer with high mid-infrared emissivity.
  • Employed molecular self-assembly and polymerization-induced pitch gradient to create customizable structural color films.
  • Integrated anti-UV properties and controlled visible light transmissivity.

Main Results:

  • Demonstrated significant temperature drops of 5.4 °C (daytime) and 7.9 °C (nighttime) under solar intensity.
  • Successfully designed and implemented vivid red, green, blue, and colorless films with tunable properties.
  • Achieved a 11.1 °C temperature rise using an applied alternating current field, indicating electro-tunable thermal management.

Conclusions:

  • The developed PRC films offer a promising solution for smart windows and wearables, combining thermal management, UV protection, and aesthetic customization.
  • The strategy provides a new approach for balancing optical properties and radiative cooling efficiency.
  • The technology opens avenues for advanced thermal management and energy-saving applications.