Robust Hydrophobic Surfaces Displaying Different Surface Roughness Scales While Maintaining the Same Wettability

Petra M. Hansson, Lisa Skedung, Per M. Claesson, Agne Swerin, Joachim Schoelkopf, Patrick A. C. Gane, Mark W. Rutland, Esben Thormann

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

A range of surfaces coated with spherical silica particles, covering the size range from nanometer to micrometer, have been produced using Langmuir–Blodgett (LB) deposition. The particles were characterized both in suspension and in the Langmuir trough to optimize the surface preparation procedure. By limiting the particle aggregation and surface layer failures during the preparation steps, well-defined monolayers with a close-packed structure have been obtained for all particle sizes. Thus, this procedure led to structured surfaces with a characteristic variation in the amplitude and spatial roughness parameters. In order to obtain robust surfaces, a sintering protocol and an AFM-based wear test to determine the stability of the deposited surface layer were employed. Hydrophobization of the LB films followed by water contact angle measurements showed, for all tested particle sizes, the same increase in contact angle compared to the contact angle of a flat hydrophobic surface. This indicates nearly hexagonal packing and gives evidence for nearly complete surface wetting of the surface features.
Original languageEnglish
JournalLangmuir
Volume27
Issue number13
Pages (from-to)8153-8159
ISSN0743-7463
DOIs
Publication statusPublished - 2011
Externally publishedYes

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