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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 by the stimulus-induced morphology changes by the stimulus-induced morphology changes 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 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 sponta neously change from hydrophobic and transparent to superhydrophobic and translucent with the rise of environmental humidity.