Critical and wetting transitional adsorption behaviour in a liquid system against vapour and other walls

The adsorption of 2, 5 DMP (2, 5-dimethylpyridine) at the free surface of water (1)-2, 5 DMP (2) liquid mixtures was determined from surface tension and activity measurements. Two divergences were found: the former was observed at Tc for the critical isochore and the 2, 5 DMP-rich γ-phase which, at...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2001-05, Vol.13 (21), p.4939-4956
Main Authors: Huruguen, J P, Amara, M, Méar, A M, Hamraoui, H, Olier, R, Privat, M
Format: Article
Language:English
Subjects:
Chemical Sciences
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Summary:The adsorption of 2, 5 DMP (2, 5-dimethylpyridine) at the free surface of water (1)-2, 5 DMP (2) liquid mixtures was determined from surface tension and activity measurements. Two divergences were found: the former was observed at Tc for the critical isochore and the 2, 5 DMP-rich γ-phase which, at coexistence, completely wets the surface at Tc, whereas the latter was noticed at Tw for the water-rich β-phase. These results were compared with those found under similar conditions for the same liquid system with silica as the wall; this comparison is quite fruitful because, with silica, the preferentially wetting phase is the β-phase.
ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/13/21/320