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Multistate and On-Demand Smart Windows.

Hye-Na Kim1, Dengteng Ge1,2, Elaine Lee1,3

  • 1Department of Materials Science and Engineering, University of Pennsylvania, 3231 Walnut Street, Philadelphia, PA, 19104, USA.

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Summary
This summary is machine-generated.

Mechanoresponsive smart windows were created using wrinkled poly(dimethylsiloxane) films with silica particles. Varying wrinkle geometry and strain allows tunable optical transmittance for on-demand window applications.

Keywords:
composite filmson-demandsilica particlessmart windowswrinkles

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Nanotechnology

Background:

  • Smart windows offer tunable optical properties for energy efficiency and dynamic control.
  • Developing mechanoresponsive materials that change optical transmittance with mechanical strain is an active research area.

Purpose of the Study:

  • To engineer on-demand mechanoresponsive smart windows using composite films.
  • To investigate the relationship between film structure, mechanical strain, and optical transmittance.

Main Methods:

  • Fabrication of composite films with wrinkled poly(dimethylsiloxane) and embedded silica particles.
  • Systematic variation of wrinkle geometry, silica particle size, and applied stretching strain.
  • Optical transmittance measurements across the visible to near-infrared spectrum.

Main Results:

  • Achieved significant optical transmittance changes (visible to near-infrared) with small strains (as low as 10%).
  • Demonstrated tunable initial optical states and transmittance modulation by controlling wrinkle geometry and strain.
  • Observed drastic transmittance decrease upon further stretching due to secondary wrinkle and nanovoid formation.

Conclusions:

  • Composite films with controlled wrinkles and silica particles exhibit on-demand mechanoresponsive behavior for smart window applications.
  • The study highlights the potential for strain-engineered optical properties in advanced materials.
  • Precise control over film architecture and mechanical stimuli enables tunable optical performance.