Journal
LANGMUIR
Volume 26, Issue 22, Pages 16634-16637Publisher
AMER CHEMICAL SOC
DOI: 10.1021/la102928g
Keywords
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Funding
- Natural Science Foundation of China [20774082, 50830106]
- National Science Fund for Distinguished Young Scholars [51025012]
- State Key Laboratory of Supramolecular Structure and Materials [SKLSSM200911]
- Fundamental Research Funds for the Central Universities [2009QNA4039]
- Ph.D. Programs Foundation of Ministry of Education [20070335024]
- NSFC-ZJ [Y4080250]
- French Ministry of Foreign and European Affairs
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A humido-responsive free-standing film has been created using layer-by-layer assembly technique. Polyethylenimine(PEI) at high was assembled with poly(acrylic acid) (PAA) at low pH on a Teflon substrate to yield a micro-nanostructured surface that can be made superhydrophobic after being coated with a low surface energy compound. The resulting asymmetric freestanding film with one surface being superhydrophobic while the Other is hydrophilic after detachment from the substrate can undergo reversible bending/unbending shape transitions when the environmental humidity is changed. The bending, unbending movement of the free-standing film can be ascribed to the different responses of these two surfaces to humidity.
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