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Permanent link (DOI): https://doi.org/10.7939/R3WD7Q

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Photothermal Cantilever Deflection Spectroscopy of Physisorbed Naphtha Open Access

Descriptions

Other title
Subject/Keyword
Photothermal Cantilever Deflection Spectroscopy
Naphtha Detection
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Bagheri, Mehrdad
Supervisor and department
Thundat, Thomas (Chemical and Materials Engineering)
Examining committee member and department
Nazemifard, Neda (Chemical and Materials Engineering)
Thundat, Thomas (Chemical and Materials Engineering)
Yeung, Tony (Chemical and Materials Engineering)
Department
Department of Chemical and Materials Engineering
Specialization
Chemical Engineering
Date accepted
2012-09-05T12:33:02Z
Graduation date
2012-09
Degree
Master of Science
Degree level
Master's
Abstract
We have used photothermal cantilever deflection spectroscopy (PCDS) for selective and sensitive detection of hydrocarbons with a particular emphasis on monitoring naphtha physisorbed on cantilevers. In PCDS, molecules physisorbed on a bi-material microcantilever are illuminated with a mid-infrared light from a monochromator. Here, we report on detecting and molecularly discriminating nanogram quantities of hydrocarbons on the cantilever using PCDS technique. The obtained PCDS and traditional IR spectroscopies results are in excellent concurrence. We also developed a technique to determine the effective convection heat transfer (h) for the microcantilevers used in our PCDS experiments by measuring the bending of the cantilever in response to the variations of the cantilever base temperature Tb. The designed experiment is straightforward and accurate. This yields a value of 1350-1650 W/k.m2. We point out that the thermal sensitivity and the optimum thickness ratio of bi-material cantilevers used in PCDS setups depends on h.
Language
English
DOI
doi:10.7939/R3WD7Q
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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