Spontaneous wrinkling of layer-by-layer assembled polyelectrolyte films for humidity-responsive superhydrophobicity  

作　　者：Yang Li Xiang Li Wenjin Guo Mengchun Wu Junqi Sun 

机构地区：[1]State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University

出　　处：《Science China Chemistry》2016年第12期1568-1573,共6页中国科学（化学英文版）

基　　金：supported by the National Natural Science Foundation of China(21225419)

摘　　要：The fabrication of smart films with reversible wettability enabled by the stimulus-induced 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 humidity-induced wrinkling/de-wrinkling process.The film was fabricated by depositing hydrophobic SiO2 nanoparticles(NPs) on poly(acrylic acid)(PAA)/poly(allylamine hydrochloride)(PAH) films, followed by partially exfoliating the films from the underlying substrates. The partially exfoliated PAA/PAH film can reversibly wrinkle and de-wrinkle 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 humidity-enabled wrin-kling/de-wrinkling ability of the composite film. The hydrophobic SiO2 NPs and the underlying humidity-wrinkling PAA/PAH film enable the composite film to spontaneously change from hydrophobic and transparent to superhydrophobic and translucent with the rise of environmental humidity.The fabrication of smart films with reversible wettability enabled by the stimulus-induced 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 humidity-induced wrinkling/de-wrinkling process. The film was fabricated by depositing hydrophobic SiO2 nanoparticles （NPs） on poly（acrylic acid） （PAA）/poly（allylamine hydrochloride） （PAH） films, followed by partially exfoliating the films from the underlying substrates. The partially exfoliated PAA/PAH film can reversibly wrinkle and de-wrinkle 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 humidity-enabled wrin-kling/ de-wrinkling ability of the composite film. The hydrophobic SiO2 NPs and the underlying humidity-wrinkling PAA/PAH film enable the composite film to spontaneously change from hydrophobic and transparent to superhydrophobic and translucent with the rise of environmental humidity.

关 键 词：humidity responsive SUPERHYDROPHOBIC reversible WRINKLE layer-by-layer 

分 类 号：TB383.2[一般工业技术—材料科学与工程]