The Influence of Geometry on Superhydrophobicity
2009 (English)In: SMART COATINGS II / [ed] Provder T; Baghdachi J, 2009, Vol. 1002, 250-273 p.Conference paper (Refereed)
Super-hydrophobic surface properties may arise from the interplay between an intrinsic, relatively high contact angle of the solid surface involved, and the geometric features of the solid surface. In the present work this relationship was investigated, for a range of different surface geometries, making use of a theoretical model based on surface free energy minimisation. As a rule, the free energy minima (and maxima) occur when the Laplace and Young conditions are simultaneously fulfilled. Special efforts have been devoted to investigating the free energy barriers that are present between the Cassie-Baxter (heterogeneous wetting) and Wenzel (homogeneous wetting) modes of wetting. Along with the above scheme a new experimental method for characterising the wetting of structured surfaces has been developed. Sessile drops of 3 % (by weight) agarose solution were immobilised on test surfaces. The drops could be removed after solidification and by using confocal microscopy and image processing it was possible to characterise the interface between the droplet and the solid surface. This analysis also made it possible to determine wetting mode of the droplet, and to estimate the wet surface area and the local contact angles beneath the drop.
Place, publisher, year, edition, pages
2009. Vol. 1002, 250-273 p.
, ACS Symposium Series, ISSN 0097-6156
IdentifiersURN: urn:nbn:se:kth:diva-29241DOI: 10.1021/bk-2009-1002.ch013ISI: 000280865500013ScopusID: 2-s2.0-84904810663ISBN: 978-0-8412-7218-7OAI: oai:DiVA.org:kth-29241DiVA: diva2:392804
Smart Coatings II Conference, Orlando, FL, FEB 15, 2006
QC 201101282011-01-282011-01-272011-01-28Bibliographically approved