Titre :
|
Dynamic surface tension determination using an automated bubble pressure tensiometer
|
Auteurs :
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R. Miller ;
V. Fainerman ;
K. Schano ;
AL Et
|
Type de document :
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article/chapitre/communication
|
Année de publication :
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1997
|
Format :
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p. 357-363
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Langues:
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= Anglais
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Catégories :
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METROLOGIE
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Mots-clés:
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TENSION SUPERFICIELLE
;
MESURE
;
APPAREIL DE MESURE
;
DETERGENT AGENT DE SURFACE
;
PRESSION
|
Résumé :
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A newly designed fully automated maximum bubble pressure tensiometer has many advantages compared to known instruments developed so far. The most striking feature is the possibility to determine the bubble dead time and to calculate the efficient surface age of a bubble. The state of the art of the theory for describing adsorption processes at the surface of a growing bubble is discussed and useful approximate solutions are given and applied to example experiments. The temperature and viscosity dependence of the adsorption kinetics of a model surfactant, Triton X-100, are discussed in terms of a diffusion controlled adsorption model. Finally, as an example, measurements of human blood and urine samples ale presented in order to show the sensitivity of dynamic surface tensions to changes in the composition of such complex liquids. Measurements of river water samples show an additional field of application in water treatment control.
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Source :
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Tenside Surfactants Detergents, vol.34
|