Wetting observed by evanescent-wave-generated fluorescence spectroscopy II. Selective excitation: methylcyclohexane + perfluoromethyl cyclohexane at the upper critical endpoint

Ann-Marie Williamson and Ian A. McLure

Physica A: Statistical Mechanics and its Applications, 1996, vol. 234, issue 1, 225-238

Abstract: Wetting at the solid (SF4 glass)-liquid interface of the binary liquid mixture methylcyclohexane + perfluoromethylcyclohexane is studied using evanescent-wave-generated fluorescence spectroscopy (EWGFS). The fluorescent probe, 1,6-diphenyl-1,3,5-hexatriene (DPH) is used to discriminate between the two coexisting liquid phases by means of selective excitation of DPH in the methylcyclo-hexane-rich phase using a laser operating at 371 nm. A wetting transition is observed beginning at ∼32°C with a wetting layer apparently attaining maximum thickness at ∼38°C in relation to an upper critical solution temperature TUCS ∼ 46°C, but more specific information regarding the order and position of the transition cannot be established until a number of experimental design changes are implemented.

Keywords: Critical point wetting; Binary liquid mixture; Evanescent-wave-induced fluorescence spectroscopy; Selective excitation (search for similar items in EconPapers)
Date: 1996
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:234:y:1996:i:1:p:225-238

DOI: 10.1016/S0378-4371(96)00155-0

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