Monitoring Photochemical Reactions Using Marangoni Flows
#MMPMID28319399
Muller J
; Wedershoven HMJM
; Darhuber AA
Langmuir
2017[Apr]; 33
(15
): 3647-3658
PMID28319399
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We evaluated the sensitivity and time resolution of a technique for photochemical
reaction monitoring based on the interferometric detection of the deformation of
liquid films. The reaction products change the local surface tension and induce
Marangoni flow in the liquid film. As a model system, we consider the irradiation
of the aliphatic hydrocarbon squalane with broadband deep-UV light. We developed
a numerical model that quantitatively reproduces the flow patterns observed in
the experiments. Moreover, we present self-similarity solutions that elucidate
the mechanisms governing different stages of the dynamics and their parametric
dependence. Surface tension changes as small as ?? = 10(-6) N/m can be detected,
and time resolutions of <1 s can be achieved.
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