Diphylleia grayi-Inspired Intelligent Hydrochromic Adhesive Film

Gang Yeol Yoo, Seungje Lee, Minji Ko, Hyunjin Kim, Keyong Nam Lee, Woong Kim, Young Rag Do

Research output: Contribution to journalArticlepeer-review

Abstract

Diphylleia grayi-inspired hydrochromic nano/microstructured films have received much attention for its promising smart hydrochromic applications owing to their simple and low-cost but energy-effective strategy. A new type of water-switchable glazing film patterned with various nano/micro air-hole inverse opal arrays is introduced by selectively removing nano/microsphere polystyrene arrays embedded in the surface of polydimethylsiloxane (PDMS) films. Using the significant contrast ratio of the bleaching and the scattering states, we have optimized the switching properties of Mie scattered patterns. As a result, we obtained a single inverse opal layer-embedded PDMS adhesive film with hexagonally close-packed 1 μm air-hole arrays as an optimum scattered film. The differences of diffusive transmittance and optical haze values between the dry and the wet states of the best scattered film reached 44.93% (ΔTD.T = 59.11-14.18%) and 54.88% (ΔH = 69.42-14.54%), respectively. In addition, using the best-optimized inverse opal layer-embedded PDMS film, we fabricated a perfectly imitated Diphylleia grayi structure for camouflage application and an intelligent hydrochromic window device. The dynamic water modulation of the scattered opaque and nonscattered transparent state of the inverse opal-patterned PDMS adhesive film can provide an advanced platform structure in the area of hydrochromic technology for smart windows, camouflage, and clear umbrellas for rainy days.

Original languageEnglish
Pages (from-to)49982-49991
Number of pages10
JournalACS Applied Materials and Interfaces
Volume12
Issue number44
DOIs
Publication statusPublished - 2020 Nov 4

Keywords

  • Diphylleia grayi
  • Mie scattering
  • bioinspired design
  • camouflage
  • nano/microcavities
  • smart window application
  • water circulation system

ASJC Scopus subject areas

  • Materials Science(all)

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