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Superhydrophobicity: Cavity growth and wetting transition
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science.
2015 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 448, 482-491 p.Article in journal (Refereed) Published
Abstract [en]

We show by using AFM colloidal probe microscopy (combinations of hydrophobic/superhydrophobic as probe/surface) that superhydrophobicity displays a set of specific events when compared with hydrophobicity. Both attraction (due to capillary and wetting forces) and repulsion (most likely due to repelling air/vapor layers or micro-/nanobubbles) occur upon approach and when surfaces are pulled apart both shorter range (50-100. nm or more) and longer range (several micrometers) attractive forces are displayed. The interaction is explained by forces generated through the formation of air and water vapor cavities, in the shorter-range (<50. nm) case maintaining a constant volume of the cavity, in agreement with calculation of capillary forces, and in the longer-range (<1. μm) case through access of air to the cavity, in agreement with thermodynamics of cavity growth. An added sodium dodecyl sulphate surfactant gave a partially reversible wetting transition and reduced the longer-range interaction to shorter-range, suggesting a transfer from the Cassie-Baxter to the Wenzel wetting regime. The findings would be of interest in development of practical applications, such as for anti-soiling, anti-icing, protection of electrical components and for extreme water-repellency in paper and textiles.

Place, publisher, year, edition, pages
2015. Vol. 448, 482-491 p.
Keyword [en]
Atomic force microscopy, Cavitation, Superhydrophobicity, Surface forces, Surfactant, Wetting, Hydrophobicity, Probes, Surface active agents, Thermodynamics, Attractive force, Electrical components, Longer-range interaction, Reversible wetting, Sodium dodecyl sulphate, Wetting transitions, dodecyl sulfate sodium, silica nanoparticle, Article, atmosphere, contact angle, geometry, hydrodynamics, microscopy, priority journal, scanning electron microscopy, water vapor
National Category
Chemical Sciences
URN: urn:nbn:se:kth:diva-167704DOI: 10.1016/j.jcis.2015.02.054ISI: 000360592100058PubMedID: 25771290ScopusID: 2-s2.0-84924566069OAI: diva2:815933

QC 20150602

Available from: 2015-06-02 Created: 2015-05-22 Last updated: 2015-10-05Bibliographically approved

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Wåhlander, MartinSwerin, Agne
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