Wetting observed by evanescent-wave-generated fluorescence spectroscopy I. Differential solubility: 2,6-Lutidine + water at the lower critical endpoint

Ian A. McLure and Ann-Marie Williamson

Physica A: Statistical Mechanics and its Applications, 1996, vol. 234, issue 1, 206-224

Abstract: Wetting at the solid-liquid interface of the binary liquid mixture 2,6-lutidine + water near its lower critical endpoint at TLCS = 34°C is studied using evanescent-wave-generated fluorescence spectroscopy (EWGFS), otherwise known as total internal reflection fluorescence (TIRF). The validity of the technique is assessed. In particular, the underlying assumptions are critically reviewed with a view to extending the technique both to other less experimentally accessible mixtures and to the study of as-yet-not-entirely resolved wetting phenomena such as prewetting. Although a wetting transition is observed for the named mixture, more specific information regarding the order and position of the transition cannot be established until a number of experimental design changes are implemented, in particular, better stirring of the mixture to achieve diffusional equilibrium without hysteresis.

Keywords: Critical point wetting; Binary liquid mixture; Evanescent-wave-induced fluorescence spectroscopy (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:206-224

DOI: 10.1016/S0378-4371(96)00147-1

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