EventsDr. Iskender Yılgör

Superhydrophobic polymer surfaces: Effect of surface micro/nanostructure

Effect of the coating method and surface micro/nanostructure on the formation of superhydrophobic polymer surfaces, modified by the incorporation of hydrophobic fumed silica nanoparticles were investigated. Four different silica/polymer dispersions, which included polydimethylsiloxane-urea (PSU), poly(methyl methacrylate) (PMMA), polystyrene (PS) and epoxy resin (ER) were coated onto glass substrates using; (i) layer-by-layer spin-coating, (ii) spray coating by an air-brush, and (iii) doctor blade coating. Influence of the coating method, composition of the polymer/silica mixtures and the number of silica layers applied on the topography and wetting behavior of the surfaces were determined. Surfaces obtained were characterized by scanning electron microscopy (SEM), atomic force microscopy (AFM), white light interferometry (WLI) and advancing and receding water contact angle measurements. It was demonstrated that surfaces with dual micro/nano roughness, that display superhydrophobic behavior could be obtained by all methods. Applicability of Wenzel and Cassie-Baxter models to the experimentally determined static water contact angles on three polymer surfaces with different chemical structures (PSU, PMMA and PS) was investigated. Various commercial applications of these superhydrophobic surfaces currently underway will also be discussed.

About The Speaker

İskender Yilgör received his BS, MS and PhD degrees in Chemistry from Middle East Technical University, Ankara, Turkey. He worked with Prof. Jim McGrath at Virginia Tech from 1980 to 1985. Later he served as VP of R&D at Thoratec Labs (1985-1989) Berkeley, CA, and Goldschmidt Chemical Corp. (1989-1994) Hopewell, VA. In 1994 Dr. Yilgör joined Koç University (KU), as the founding member of the Chemistry Department, where he is currently a full Professor. At KU he established Polymer Research Laboratories and Surface Science and Technology Center (KUYTAM). He is also the founding Director of KU Health Sciences Institute. He received Tübitak Science Award in 2003 and was a member of Tübitak Science Board (2009-2013). Prof. Yilgör’s current research interests include synthesis and investigation of the structure-morphology-property behavior of segmented and hyperbranched copolymers, preparation of polymeric 3D scaffolds for tissue engineering and surface modification of polymers. He published 2 books, over 100 refereed articles and is a co-inventor on over 20 US and international patents. He is the Associate Editor of European Journal of Chemistry and Editorial Board Member of Silicon.

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