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Spectrophotometry of thin films of light absorbing particles

Binks, Bernard P.; Fletcher, Paul D.I.; Johnson, Andrew J.; Marinopoulos, Ioannis; Crowther, Jonathan M.; Thompson, Michael A.

Authors

Paul D.I. Fletcher

Andrew J. Johnson

Ioannis Marinopoulos

Jonathan M. Crowther

Michael A. Thompson

Abstract

Thin films of dispersions of light absorbing solid particles or emulsions containing a light absorbing solute all have a non-uniform distribution of light absorbing species throughout the sample volume. This results in non-uniform light absorption over the illuminated area which causes the optical absorbance, as measured using a conventional specular UV-vis spectrophotometer, to deviate from the Beer-Lambert relationship. We have developed a theoretical model to account for the absorbance properties of such films which are shown to depend on the size and volume fraction of the light absorbing particles plus other sample variables. We have compared model predictions with measured spectra for samples consisting of emulsions containing a dissolved light absorbing solute. Using no adjustable parameters, the model successfully predicts the behaviour of non-uniform, light absorbing emulsion films with varying values of droplet size, volume fraction and other parameters.

Journal Article Type Article
Publication Date Apr 18, 2017
Journal Langmuir
Print ISSN 0743-7463
Electronic ISSN 1520-5827
Publisher American Chemical Society
Peer Reviewed Peer Reviewed
Volume 33
Issue 15
Pages 3720-3730
Institution Citation Binks, B. P., Fletcher, P. D., Johnson, A. J., Marinopoulos, I., Crowther, J. M., & Thompson, M. A. (2017). Spectrophotometry of thin films of light absorbing particles. Langmuir : the ACS journal of surfaces and colloids, 33(15), 3720-3730. doi:10.1021/acs.langmuir.6b04443
DOI https://doi.org/10.1021/acs.langmuir.6b04443
Keywords Light absorption; Spectrophotometry
Publisher URL http://pubs.acs.org/doi/abs/10.1021/acs.langmuir.6b04443
Copyright Statement ©2018 University of Hull
Additional Information This is the accepted manuscript of an article published in Langmuir, 2017. The version of record is available at the DOI link in this record.

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