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RESEARCH FRONT
Contents Vol 65(3)

In Situ SAXS Analysis of Interfacial Wetting on Nanorough Surfaces

Jacky K. L. Cho A , Lauren A. Palmer A , Alex H.-F. Wu A , Irving I. Liaw A B , David Cookson C and Robert N. Lamb A
+ Author Affiliations
- Author Affiliations

A The School of Chemistry, University of Melbourne, Vic. 3010, Australia.

B Melbourne Materials Institute, University of Melbourne, Vic. 3010, Australia.

C Australian Synchrotron, Clayton, Vic. 3168, Australia.

D Corresponding author. Email: rnlamb@unimelb.edu.au

Australian Journal of Chemistry 65(3) 254-258 https://doi.org/10.1071/CH12002
Submitted: 3 January 2012  Accepted: 16 February 2012   Published: 21 March 2012

Abstract

Superhydrophobic surfaces were fabricated through a nanoparticle sol-gel process in the presence of a mono-disperse latex particle. By varying precursor nanoparticle size, surfaces of varying degrees of nanoroughness but controlled macro-roughness were produced, all of which exhibited superhydrophobic properties (θwater >160°, sliding angle <10°). These were immersed in water and studied in situ using synchrotron small angle X-ray scattering where the percentage interface under wetting (in contact with liquid) was directly quantified and found to agree well with traditional Cassie equations. Wetting studies in sodium dodecyl sulphate solutions of decreasing surface tension highlighting surfaces of increased hierarchical roughness (pseudo-fractal dimension ~2.5) contained significant quantity of entrapped air even at fluid surface tensions down to 37 mN m–1.


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