Humidity-gated, temperature-responsive photonic infrared reflective broadband coatings

Ellen P.A. van Heeswijk, Joey J.H. Kloos, Nadia Grossiord (Corresponding author), Albertus P.H.J. Schenning (Corresponding author)

Research output: Contribution to journalArticleAcademicpeer-review

3 Citations (Scopus)

Abstract

The fabrication of temperature responsive photonic polymers remains a challenge. Here, we report the fabrication of humidity-gated temperature-responsive infrared reflective photonic coatings using an easy-to-process bar-coating technique. At high humidity the hydroscopic cholesteric liquid crystalline polymer is able to absorb water vapour from the air causing swelling of the photonic coating. By increasing the temperature, water is desorbed from the coating, resulting in a reversible 420 nm shift of the photonic reflection band. In particular, it is shown that temperature-responsive single-layered broadband IR reflective coatings, prepared by creation of a pitch gradient of the cholesteric liquid crystals, might be suitable for smart window applications in high relative humidity environments such as greenhouses.

LanguageEnglish
Pages6113-6119
Number of pages7
JournalJournal of Materials Chemistry A
Volume7
Issue number11
DOIs
StatePublished - 1 Jan 2019

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Photonics
Atmospheric humidity
Infrared radiation
Coatings
Reflective coatings
Cholesteric liquid crystals
Fabrication
Temperature
Coating techniques
Liquid crystal polymers
Greenhouses
Steam
Water vapor
Swelling
Polymers
Water
Air

Cite this

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title = "Humidity-gated, temperature-responsive photonic infrared reflective broadband coatings",
abstract = "The fabrication of temperature responsive photonic polymers remains a challenge. Here, we report the fabrication of humidity-gated temperature-responsive infrared reflective photonic coatings using an easy-to-process bar-coating technique. At high humidity the hydroscopic cholesteric liquid crystalline polymer is able to absorb water vapour from the air causing swelling of the photonic coating. By increasing the temperature, water is desorbed from the coating, resulting in a reversible 420 nm shift of the photonic reflection band. In particular, it is shown that temperature-responsive single-layered broadband IR reflective coatings, prepared by creation of a pitch gradient of the cholesteric liquid crystals, might be suitable for smart window applications in high relative humidity environments such as greenhouses.",
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Humidity-gated, temperature-responsive photonic infrared reflective broadband coatings. / van Heeswijk, Ellen P.A.; Kloos, Joey J.H.; Grossiord, Nadia (Corresponding author); Schenning, Albertus P.H.J. (Corresponding author).

In: Journal of Materials Chemistry A, Vol. 7, No. 11, 01.01.2019, p. 6113-6119.

Research output: Contribution to journalArticleAcademicpeer-review

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