Abstract
In this paper a non-intrusive optical measuring technique, the laser induced fluorescence, is described to investigate mass transfer processes of a fluorescent dye (rhodamine) across an interface between two partially nonmiscible liquids (1-butanol and water) and to measure two-dimensional concentration profiles with a high spatial and temporal resolution capability near the phase boundary. Some problems of the measuring technique are discussed and solutions of this problems are given. The measured concentration profiles do not correspond with those, which were expected on basis of the usual theories. A distribution equilibrium at the phase boundary could not be found. The experimental results are discussed and possible explanations of the appeared phenomena are provided.
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