Injection molded superhydrophobic surfaces

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The Lotus effect is used as inspiration for the fabrication of injection molded (IM) hierarchical polymer surfaces with self-cleaning properties. IM is a widespread method for the fabrication of plastic items. Surface functionalization is traditionally done by potentially toxic and expensive chemical coatings. Here we present a new method for the fabrication of tool inserts with hierarchical nano- and microstructures. The method is based on a UV LIGA process combined with a black silicon (BS) etch. . The advantage of our method is the industrial manufacturability associated with IM. Preliminary results indicate a contact angle increase from 95° for the unstructured polymer to a maximum 150°.The lowest drop roll off angels observed were in the range 1° to 5°. It was nearly impossible to deposit a drop on the surface.

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Journal: TechConnect Briefs
Volume: 1, Nanotechnology 2012: Advanced Materials, CNTs, Particles, Films and Composites (Volume 1)
Published: June 18, 2012
Pages: 722 - 725
Industry sector: Advanced Materials & Manufacturing
Topics: Advanced Materials for Engineering Applications, Coatings, Surfaces & Membranes
ISBN: 978-1-4665-6274-5