Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 43, Pages 37685-37693Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b12490
Keywords
stretchable hydrochromic device; porous poly(dimethylsiloxane) film; bionics; smart window; Mie scattering
Funding
- NRF Investigatorship Award [NRF-NRFI2015-05]
- National Research Foundation, Prime Minister's Office, Singapore
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Some animals and plants in nature are endowed with elegant color changing ability, which inspired the development of biomimetic systems with multifunctionality, such as controllable colors, transmittance, and mechanical pliability that are significant for the development of energy-efficient and deformable chromic devices, such as wearable displays, smart windows, decorative architectures, camouflage devices, etc. Inspired by the color-changing ability of Diphylleia grayi (commonly known as the skeleton flower), we developed a porous poly(dimethylsiloxane) (PDMS) film that dynamically and dramatically changes its color by the adsorption/desorption of a minute amount of water (5 g m(-2)) or other solvents. This hydrochromic phenomenon was analyzed in detail, and it matched well with the Mie scattering theory. The porous PDMS film of about 0.4 mm thickness exhibits a large optical modulation (about 75-80%) in the broad visible and near infrared region and a coloration speed of less than 9 min. Additionally, the PDMS film can sustain uniaxial strain up to 100% in both transparent and colored states. We believe this new strategy to develop highly scalable porous PDMS films offers a practical route to realize bionic and botanic inspired deformable energy-efficient facades, chromogenic wearables, smart windows, smart displays, camouflage devices, etc.
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