, Pour conclure, nous avons montré que des mélanges d'espèces de tension de surface différente, présentant un écart par rapport à un comportement linéaire de la tension de surface, seront le siège d'écoulements par effet Marangoni lors de l'amincissement des films. Ils seront suffisants pour stabiliser les mousses pendant quelques dizaines de secondes. Ces effets qui sont très importants, ne suffisent pas à expliquer toutes les observations de stabilité de mousses d'huiles. Par ailleurs, l'interprétation du rôle des asphaltènes

, Ces travaux ouvrent la voie à la compréhension des mécanismes de stabilisation des mousses d'huiles. Il reste, en effet, à quantifier précisément le rôle des effets Marangoni, à préciser le rôle des effets colloïdaux, mais aussi à étudier les effets de cristallisation de surface

, On obtient alors en réécrivant l'équation (C.4) avec la relation ci-dessus

, Cette équation donne la variation de la densité surfacique en espèces A dans un système fermé après une modification de surface

, Remarque 1 : On peut vérifier que si le ratio entre A et B est le même en surface et en volume, une variation de surface ne fait pas varier

, Remarque 2 : si l'épaisseur tend vers l'infini, la variation s'annule

, Nous allons maintenant faire l'approximation que la tension de surface ? est la combinaison linéaire des deux tensions de surface respectives ? A et ? B de A et de B, pondérées par leur concentration surfacique

, La variation de la tension de surface sous l'effet d'un changement de surface peut alors s'écrire

, La première dérivée est donnée par la dérivée de l'équation (C.6) (en utilisant la conservation ? A +? B =????soit: Notons également que la dérivée peut s'exprimer à partir de la mesure de la dérivée de la tension superficielle avec la composition

C. L'équation, , vol.7

, Et on peut finalement éliminer à partir de l'équation C.6. En notant

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