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A Dual-Band Smart Window with Electrical-Thermal Control for Visible and Near-Infrared Light Modulation.

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Small (Weinheim an Der Bergstrasse, Germany)
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Summary
This summary is machine-generated.

This study introduces a novel composite smart window film that controls visible light electrically and near-infrared light thermally. This dual-function film achieves significant solar modulation and demonstrates effective radiative cooling performance.

Keywords:
polymer dispersed liquid crystalsmart windowstungsten‐doped vanadium dioxidevisible and near‐infrared light modulation

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Energy Science

Background:

  • Polymer dispersed liquid crystal (PDLC) films offer electro-optical properties for smart windows but lack near-infrared (NIR) modulation for comprehensive solar management.
  • Existing smart window technologies often fail to address both visible light and NIR spectrum for complete thermal control.

Purpose of the Study:

  • To design and demonstrate a composite film with dual electrical-thermal control for advanced solar management and radiative cooling.
  • To integrate PDLC for visible light modulation and tungsten-doped vanadium dioxide (W/VO2) for NIR modulation and thermal control.

Main Methods:

  • Fabrication of a composite film integrating PDLC as an electrochromic layer and W/VO2 coating as a thermochromic layer.
  • Characterization of electro-optical and thermochromic properties, including solar modulation, visible transmittance, and radiative cooling performance.
  • Utilized MATLAB simulations to predict diurnal and nocturnal cooling power.

Main Results:

  • The composite film achieved 13.90% solar modulation and 54.77% visible transmittance.
  • Demonstrated significant temperature reduction of 12.5°C compared to blank glass under solar simulation.
  • Achieved sub-ambient cooling of 2.3°C below ambient temperature in outdoor tests, with simulated cooling powers of 59.55 W m⁻² (day) and 109.01 W m⁻² (night).

Conclusions:

  • The developed composite film effectively regulates visible light electrically and NIR light thermally, offering a promising solution for smart windows.
  • The film exhibits high emissivity in the atmospheric window, contributing to remarkable radiative cooling performance.
  • This dual-control smart window technology advances light and thermal management for energy-efficient buildings and climate control.