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

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....

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Bibliographic Details
Published in:Langmuir 2011-07, Vol.27 (13), p.8153-8159
Main Authors: Hansson, Petra M, Skedung, Lisa, Claesson, Per M, Swerin, Agne, Schoelkopf, Joachim, Gane, Patrick A. C, Rutland, Mark W, Thormann, Esben
Format: Article
Language:English
Subjects:
AIR/WATER INTERFACE
CASSIE
Chemistry
Colloidal state and disperse state
CRYSTALS
DEPOSITION
Exact sciences and technology
General and physical chemistry
Interfaces: Adsorption, Reactions, Films, Forces
Kemi
LANGMUIR-BLODGETT-FILMS
MEDICIN
MEDICINE
MONOLAYERS
NANOPARTICLES
Physical and chemical studies. Granulometry. Electrokinetic phenomena
Robust hydrophobic surfaces displaying different surface roughness scales while maintaining the same wettability
SILICA PARTICLES
Solid-liquid interface
Surface physical chemistry
WATER
WENZEL
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Summary: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.
ISSN:0743-7463
1520-5827
1520-5827
DOI:10.1021/la201121p