Dresden 2009 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 38: POSTERS Micro- and Nanofluidics
CPP 38.12: Poster
Donnerstag, 26. März 2009, 17:00–19:30, P3
Wetting of hydrophilic periodic nanotemplates on Si surfaces — Stefan Heindl1, •Alfred Plettl1, Sabine Hild2, and Paul Ziemann1 — 1Institut für Festkörperphysik, Universität Ulm, D-89069 Ulm, Germany — 2Institut für Polymerwissenschaften, Universität Linz, A-4040 Linz, Austria
To influence the wetting behavior of a Si surface, periodically ordered nanomasks were prepared by either a micellar [1] or a miniemulsion technique [2] and used to fabricate extended arrays of nanopillars on a Si wafer by RIE etching [3]. These methods allow a systematic variation of the height and density of such structures. The degree of hydrophobicity of the samples was additionally modified by coating with hexamethyldisilane (HMDS) or octadecyltrisilane (OTS). Wetting of water was studied by measuring contact angles as well as spreading-receding hysteresis behavior. The specific effect of the nanostructures is to increase the contact angles and enhance hysteresis.
By combining the above nanopatterning techniques with conventional electron beam lithography and a cryogenic Si deep etching, two different roughness scales can be superimposed. The resulting effect on wetting may contribute to an understanding of the well-known Lotus effect.
[1] G. Kästle et al., Adv. Funct.Mat. 13, 853 (2003).
[2] A. Manzke et al., Adv. Mater. 19, 1337 (2007).
[3] F. Weigl et al., Diamond and rel. Mat.15, 1689 (2006).