Porous Polymers with Switchable Optical Transmittance for Optical and Thermal Regulation

Jyotirmoy Mandal, Mingxin Jia, Adam Overvig, Yanke Fu, Eric Che, Nanfang Yu, Yuan Yang

Research output: Contribution to journalArticlepeer-review

205 Scopus citations

Abstract

Adaptive control of broadband light is essential for diverse applications including building energy management and light modulation. Here, we present porous polymer coatings (PPCs), whose optical transmittance changes upon reversible wetting with common liquids, as a platform for optical management from solar to thermal wavelengths. In the solar wavelengths, reduction in optical scattering upon wetting changes PPCs from reflective to transparent. For poly(vinylidene fluoride-co-hexafluoropropene) PPCs, this corresponds to solar and visible transmittance changes of up to 0.74 and 0.80, respectively. For infrared (IR) transparent polyethylene PPCs, wetting causes an “icehouse-to-greenhouse” transition where solar transparency rises but thermal IR transparency falls. These performances are either unprecedented or rival or surpass those of notable optical switching (e.g., electrochromic and thermochromic) paradigms, making PPCs promising for large-scale optical and thermal management. Specifically, switchable sub-ambient radiative cooling (by 3.2°C) and above-ambient solar heating (by 21.4°C), color-neutral daylighting, and thermal camouflage are demonstrated.

Original languageEnglish (US)
Pages (from-to)3088-3099
Number of pages12
JournalJoule
Volume3
Issue number12
DOIs
StatePublished - Dec 18 2019
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Energy

Keywords

  • daylighting
  • infrared
  • optical modulation
  • optical switching
  • porous polymers
  • radiative cooling
  • solar
  • solar heating
  • thermoregulation
  • transmittance switching

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