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Permanent link (DOI): https://doi.org/10.7939/R3MP8C

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Influence of nanoscale surface topographical heterogeneity on colloidal interactions Open Access

Descriptions

Other title
Subject/Keyword
surfaces
AFM
nano
microscopy
interactions
colloidal forces
atomic force
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Hosseini, Amir
Supervisor and department
Bhattacharjee, Subir (Mechanical Engineering)
Examining committee member and department
Bhattacharjee, Subir (Mechanical Engineering)
Yeung, Tony (Chemical Engineering)
Koch, C.R. (Mechanical Engineering)
Department
Department of Mechanical Engineering
Specialization

Date accepted
2012-05-30T16:13:54Z
Graduation date
2011-06
Degree
Master of Science
Degree level
Master's
Abstract
In this thesis, measurement and analysis of colloidal forces between an atomic force microscope (AFM) probe and a topographically patterned substrate are reported. The energy between the patterned substrate and a smooth flat plate was characterized mathematically using Surface Element Integration (SEI) method. Hemispherical, conical, and cylindrical shape asperities in form of either protrusions or depressions were arrayed on a square lattice to model the rough surface. The variation of DLVO interaction energies on such nano-patterned surfaces was investigated as a function of the size and density of the asperities. It was demonstrated that roughness elements attenuate the near-field DLVO energy by orders of magnitude, whereas at larger separations, their effect is insignificant. The interaction of an AFM hemispherical model probe and a rough surface was also calculated when the probe laterally moves over the surface. The resulting energy distribution maps reveal how the AFM experimental force-distance measurements can vary depending on the lateral position of the probe on the patterned substrate.
Language
English
DOI
doi:10.7939/R3MP8C
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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