Heat-Shielding and Self-Cleaning Smart Windows: Near-Infrared Reflective Photonic Crystals with Self-Healing Omniphobicity via Layer-by-Layer Self-Assembly

Chiaki Nakamura, Kengo Manabe, Mizuki Tenjimbayashi, Yuki Tokura, Kyu Hong Kyung, Seimei Shiratori

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

Bioinspired photonic crystals that can be used to precisely control the optical reflection of light of a specific wavelength by varying their thickness and refractive index have attracted much attention. Among them, photonic crystals that can reflect near-infrared light have attracted attention owing to their potential applications including window coating with heat-shielding property. However, photonic crystals with an optical function in practical use sometimes lose their function because of contamination. Here, a near-infrared reflection coating film with self-healing omniphobicity was designed and prepared by layer-by-layer assembly and an instant liquid phase omniphobization method. The fabricated films had a self-cleaning thermal shielding effect. The films were visually transparent and could be used to control the reflection peak of the near-infrared light (range of 700-1000 nm) by adjusting the film thickness, which prevented the increase in temperature in enclosed spaces. After omniphobization, the films had self-cleaning properties of their surface and retained their optical properties. These functions are promising for practical application on windows as heat-shielding.

Original languageEnglish
Pages (from-to)22731-22738
Number of pages8
JournalACS Applied Materials and Interfaces
Volume10
Issue number26
DOIs
Publication statusPublished - 2018 Jul 5

Keywords

  • heat-shielding
  • hydrophobic
  • layer-by-layer
  • near-infrared reflection film
  • photonic crystal
  • self-healing

ASJC Scopus subject areas

  • Materials Science(all)

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