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Title of Journal: Sci China Chem

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Abbravation: Science China Chemistry

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Science China Press

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DOI

10.1007/978-94-007-2294-1

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1869-1870

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Spontaneous wrinkling of layerbylayer assembled

Authors: Yang Li Xiang Li Wenjin Guo Mengchun Wu Junqi Sun
Publish Date: 2016/10/25
Volume: 59, Issue: 12, Pages: 1568-1573
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Abstract

The fabrication of smart films with reversible wettability enabled by the stimulusinduced morphology changes has attracted growing interest but remains a challenge Here we report a smart film that can reversibly changes its wettability between transparent hydrophobicity to translucent superhydrophobicity through the humidityinduced wrinkling/dewrinkling process The film was fabricated by depositing hydrophobic SiO2 nanoparticles NPs on polyacrylic acid PAA/polyallylamine hydrochloride PAH films followed by partially exfoliating the films from the underlying substrates The partially exfoliated PAA/PAH film can reversibly wrinkle and dewrinkle when being alternately subjected to humid and dry environments The deposition of hydrophobic SiO2 NPs on the wrinkling PAA/PAH film does not hinder the humidityenabled wrinkling/dewrinkling ability of the composite film The hydrophobic SiO2 NPs and the underlying humiditywrinkling PAA/PAH film enable the composite film to spontaneously change from hydrophobic and transparent to superhydrophobic and translucent with the rise of environmental humidity

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