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Superhydrophobic polyimide films with a hierarchical topography : combined replica molding and layer-by-layer assembly Zhao, Yan, Li, Mei, Lu, Qinghua and Shi, Zhengyu 2008, Superhydrophobic polyimide films with a hierarchical topography : combined replica molding and layer-by-layer assembly, Langmuir, vol. 24, no. 21, pp. 12651-12657. Title Superhydrophobic polyimide films with a hierarchical topography : combined replica molding and layer-by-layer assembly Author(s) Zhao, Yan Li, Mei Lu, Qinghua Shi, Zhengyu Journal name Langmuir Volume number 24 Issue number 21 Start page 12651 End page 12657 Publisher American Chemical Society Place of publication Washington, D. C. Publication date 2008-10-10 ISSN 0743-7463 1520-5827 Summary Artificial superhydrophobic surfaces with a hierarchical topography were fabricated by using layer-by-layer assembly of polyelectrolytes and silica nanoparticles on microsphere-patterned polyimide precursor substrates followed with thermal and fluoroalkylsilane treatment. In this special hierarchical topography, micrometer-scale structures were provided by replica molding of polyamic acid using two-dimensional arrays of polystyrene latex spheres as templates, and nanosized silica particles were then assembled on these microspheres to construct finer structures at the nanoscale. Heat treatment was conducted to induce chemical cross-linking between polyelectrolytes and simultaneously convert polyamic acid to polyimide. After surface modification with fluoroalkylsilane, the as-prepared highly hydrophilic surface was endowed with superhydrophobicity due to the bioinspired combination of low surface energy materials and hierarchical surface structures. A superhydrophobic surface with a static water contact angle of 160 degrees and sliding angle of less than 10 degrees was obtained. Notably, the polyimide microspheres were integrated with the substrate and were mechanically stable. In addition, the chemical and mechanical stability of the polyelectrolyte/silica nanoparticle multilayers could be increased by heat-induced cross-linking between polyelectrolytes to form nylon-like films, as well as the formation of interfacial chemical bonds. Language eng Field of Research 100707 Nanomanufacturing 091209 Polymers and Plastics HERDC Research category C1.1 Refereed article in a scholarly journal Persistent URL http://hdl.handle.net/10536/DRO/DU:30025917 Document type: Journal Article Collection: Centre for Material and Fibre Innovation Related Links Link Description Connect to published version (restricted access) Go to link with your DU access privileges     Unless expressly stated otherwise, the copyright for items in DRO is owned by the author, with all rights reserved. Versions Version Filter Type Fri, 26 Mar 2010, 09:18:50 EST Tue, 30 Mar 2010, 10:33:22 EST Mon, 05 Apr 2010, 13:38:12 EST Mon, 05 Apr 2010, 13:39:35 EST Filtered Full Citation counts:   Cited 42 times in TR Web of Science Cited 43 times in Scopus Search Google Scholar Access Statistics: 360 Abstract Views  -  Detailed Statistics Created: Fri, 26 Mar 2010, 09:18:50 EST

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