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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
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Created: Fri, 26 Mar 2010, 09:18:50 EST