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Permanent link (DOI): https://doi.org/10.7939/R3542J

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Wetting Performance of Worn Superhydrophobic Surfaces Open Access

Descriptions

Other title
Subject/Keyword
Roughness
Abrasion algorithm
Confocal scanning microscopy
Skewness
Superhydrophobic surfaces
Wetting
Kurtosis
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Singh, Maninderjit
Supervisor and department
Amirfazli, Alidad (Department of Mechanical Engineering)
Examining committee member and department
Mouusa, Walied (Department of Mechanical Engineering)
Nychka, John (Department of Chemical and Materials Engineering)
Department
Department of Mechanical Engineering
Specialization

Date accepted
2013-01-30T10:04:01Z
Graduation date
2013-06
Degree
Master of Science
Degree level
Master's
Abstract
This thesis is concerned with the effect of mechanical wear on superhydrophobic surfaces (SHS). This work, for the first time, systematically details the simultaneous surface topography and wetting behavior changes upon abrasion of SHS. The process of physical abrasion was also simulated on the artificial terrains. An intrinsically hydrophobic polymer (PTFE) was plasma etched to fabricate SHS, as wear would solely change surface topography and avoid chemical complications. Wetting behavior was monitored using advancing and receding contact angles (CA). Confocal scanning microscopy (CSM) was used to monitor topography quantitatively using surface topographical descriptors. In initial stages of wear receding and advancing CA, remained largely unchanged. Excessive wear resulted in a large increase in CA hysteresis and lowering of the advancing CA. Wetting behavior was correlated with topographical descriptors. Trends in RMS roughness, Skewness and Kurtosis can act as guiding factors towards predicting CA hysteresis on the surface. Main finding was that the physical abrasion can be simulated computationally on analogous artificial terrains.
Language
English
DOI
doi:10.7939/R3542J
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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