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Photothermal Cantilever Deflection Spectroscopy of Physisorbed Naphtha Open Access


Other title
Photothermal Cantilever Deflection Spectroscopy
Naphtha Detection
Type of item
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 of Chemical and Materials Engineering
Chemical Engineering
Date accepted
Graduation date
Master of Science
Degree level
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.
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