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Ultrafast photophysical studies of a multicomponent sunscreen : oxybenzone - titanium dioxide mixtures
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Baker, Lewis A., Grosvenor, Lucy C., Ashfold, M. N. R. and Stavros, Vasilios G. (2016) Ultrafast photophysical studies of a multicomponent sunscreen : oxybenzone - titanium dioxide mixtures. Chemical Physics Letters, 664 . pp. 39-43. ISSN 0009-2614.
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Official URL: http://dx.doi.org/10.1016/j.cplett.2016.10.002
Abstract
Recent studies of the sunscreen constituent oxybenzone have suggested that the dominant mechanism underlying the efficient photoprotection it offers relies on an initial ultrafast enol -> keto tautomerisation, followed by nonadiabatic transfer to the ground electronic state. Subsequent collisions with the solvent bath then reform the original enol tautomer. Utilising femtosecond transient electronic absorption spectroscopy we explore the dissipation of electronic excitation energy in oxybenzone in the presence of titanium dioxide, a widely used, and complementary sunscreen component. We find the relaxation dynamics of this popular organic filter are unaltered by the presence of this favoured inorganic scatterer and the overall dynamics can be described by the additive contribution of the individual constituents. The combination of the two components provides broadband photoprotective properties justifying the widely used organic filter and inorganic scatterer mixtures in commercial sunscreen products.
Item Type: | Journal Article | ||||||||||
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Subjects: | Q Science > QD Chemistry R Medicine > RS Pharmacy and materia medica |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Chemistry Faculty of Science, Engineering and Medicine > Research Centres > Molecular Organisation and Assembly in Cells (MOAC) |
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Library of Congress Subject Headings (LCSH): | Titanium dioxide, Sunscreens (Cosmetics) , Photochemistry, Spectrum analysis | ||||||||||
Journal or Publication Title: | Chemical Physics Letters | ||||||||||
Publisher: | Elsevier | ||||||||||
ISSN: | 0009-2614 | ||||||||||
Official Date: | 1 November 2016 | ||||||||||
Dates: |
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Volume: | 664 | ||||||||||
Page Range: | pp. 39-43 | ||||||||||
Status: | Peer Reviewed | ||||||||||
Publication Status: | Published | ||||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||||
Date of first compliant deposit: | 26 October 2016 | ||||||||||
Date of first compliant Open Access: | 27 October 2016 | ||||||||||
Funder: | Engineering and Physical Sciences Research Council (EPSRC), Royal Society (Great Britain) | ||||||||||
Grant number: | EP/F500378/1, EP/L005913, EP/J007153 (EPSRC) |
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