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Smart Laser‐Writable Micropatterns with Multiscale Photo/Moisture Reconstructible Structure
Author(s) -
Zeng Songshan,
Liu Yin,
Li Shuliang,
Shen Kuangyu,
Hou Zaili,
Chooi Aimee P.,
Smith Andrew T.,
Chen Zi,
Sun Luyi
Publication year - 2021
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.202009481
Subject(s) - materials science , polydimethylsiloxane , moisture , substrate (aquarium) , laser , polyvinyl alcohol , bilayer , smart material , nanotechnology , composite material , membrane , optics , oceanography , physics , biology , genetics , geology
The design of a dynamic, versatile, convertible, and responsive micropatterned system is realized by a photo/moisture reconstructible multiscale film‐substrate bilayer structure. Specifically, a hydrophilic polyvinyl alcohol (PVA)/laponite (LP) thin film is covalently bonded to a photothermally active polydimethylsiloxane (PDMS)/carbon black (CB) soft substrate. A laser engraver can inscribe programmable aligned micro‐wrinkles by manipulating laser power and spatiotemporal control. These wrinkles can be modulated into three distinct systems 1) moisture erasable and laser re‐writable wrinkles; 2) moisture driven reversible wrinkles; 3) moisture resistant wrinkles, which are achieved by controlling a) the moisture resistance of PVA; b) the dimensional stability of PVA/LP film regulated by the LP nanostructure, which can be adjusted by the laser power and the LP ratio. This programmable system can be applied in information encryption/recording and as a moisture responsive electrical switch, offering new routes for the modulations and applications of next generation smart materials.