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Effect of Surface Depressions on Wetting and Interactions between Hydrophobic Pore Array Surfaces

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YKI, Ytkemiska Institutet AB/Institute for Surface Chemistry, Box 5607, SE-114 86 Stockholm, Sweden
Material Physics, ICT School, KTH Royal Institute of Technology, Electrum 229, SE-164 40 Kista, Sweden
§ Department of Chemistry, Surface and Corrosion Science, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden
Omya Development AG, CH-4665 Oftringen, Switzerland
School of Chemical Technology, Department of Forest Products Technology, Aalto University, P.O. Box 16300, FI-00076 Aalto, Finland
*Tel + 46 8 790 9920, Fax +46 8 208 284, e-mail [email protected]
Cite this: Langmuir 2012, 28, 30, 11121–11130
Publication Date (Web):July 6, 2012
https://doi.org/10.1021/la302036d
Copyright © 2012 American Chemical Society
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Abstract

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The surface structure is known to significantly affect the long-range capillary forces between hydrophobic surfaces in aqueous solutions. It is, however, not clear how small depressions in the surface will affect the interaction. To clarify this, we have used the AFM colloidal probe technique to measure interactions between hydrophobic microstructured pore array surfaces and a hydrophobic colloidal probe. The pore array surfaces were designed to display two different pore spacings, 1.4 and 4.0 μm, each with four different pore depths ranging from 0.2 to 12.0 μm. Water contact angles measured on the pore array surfaces are lower than expected from the Cassie–Baxter and Wenzel models and not affected by the pore depth. This suggests that the position of the three-phase contact line, and not the interactions underneath the droplet, determines the contact angle. Confocal Raman microscopy was used to investigate whether water penetrates into the pores. This is of importance for capillary forces where both the movement of the three-phase contact line and the situation at the solid/liquid interface influence the stability of bridging cavities. By analyzing the shape of the force curves, we distinguish whether the cavity between the probe and the surfaces was formed on a flat part of the surface or in close proximity to a pore. The pore depth and pore spacing were both found to statistically influence the distance at which cavities form as surfaces approach each other and the distance at which cavities rupture during retraction.

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This article is cited by 12 publications.

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  5. Esben Thormann. Surface forces between rough and topographically structured interfaces. Current Opinion in Colloid & Interface Science 2017, 27 , 18-24. https://doi.org/10.1016/j.cocis.2016.09.011
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  7. Agne Swerin, Mikael Sundin, Martin Wåhlander. One-pot waterborne superhydrophobic pigment coatings at high solids with improved scratch and water resistance. Colloids and Surfaces A: Physicochemical and Engineering Aspects 2016, 495 , 79-86. https://doi.org/10.1016/j.colsurfa.2016.01.058
  8. Kock-Yee Law, Hong Zhao. Wetting on Rough Surfaces. 2016,,, 55-98. https://doi.org/10.1007/978-3-319-25214-8_4
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  10. Martin Wåhlander, Petra M. Hansson-Mille, Agne Swerin. Superhydrophobicity: Cavity growth and wetting transition. Journal of Colloid and Interface Science 2015, 448 , 482-491. https://doi.org/10.1016/j.jcis.2015.02.054
  11. H. Yildirim Erbil. The debate on the dependence of apparent contact angles on drop contact area or three-phase contact line: A review. Surface Science Reports 2014, 69 (4) , 325-365. https://doi.org/10.1016/j.surfrep.2014.09.001
  12. Petra M. Hansson, Yashar Hormozan, Birgit D. Brandner, Jan Linnros, Per M. Claesson, Agne Swerin, Joachim Schoelkopf, Patrick A.C. Gane, Esben Thormann. Hydrophobic pore array surfaces: Wetting and interaction forces in water/ethanol mixtures. Journal of Colloid and Interface Science 2013, 396 , 278-286. https://doi.org/10.1016/j.jcis.2013.01.040

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