Gélification d’émulsions fluorées

Rheological Behavior of Fluorinated Highly Concentrated Reverse Emulsions with Temperature

“…Compared with the values for analogous fluorinated surfactants (7,12), this low value means that the emulsions are of the waterin-oil type. Furthermore, the PIT (Phase Inverted Temperature) of the system determined according to an empirical equation developed by Ravey et al (13,14) is about Ϫ100°C. Hence, at working temperatures the system shows a hydrophobic behav- ior and the continuous medium is oil.…”

“…The emulsions studied here were of reverse type, i.e., water droplets dispersed in a fluorinated oily phase stabilized using a fluorinated, nonionic surfactant (3)(4)(5). The continuous medium is a swollen reverse micellar phase (L 2 ) (4,6).…”

Influence of physico-chemical parameters on rheological properties of concentrated reverse emulsions

“…These fluorinated systems may be optically transparent because of a refractive index effect. 6,9 With such a high water content, the dispersed droplets are very densely packed, deformed, and the emulsions behave like viscoelastic gels, which prompted the name ' gel-emulsion ' for them. 10 Observations with an optical microscope show that the droplets of water are polydisperse and their average radius is of the order of a few micrometers.…”

Fluorinated Microemulsions: A Study of the Phase Behavior and Structure

“…Since they behave similarly to their fully hydrogenated homologues, they can be usefully investigated with these techniques to deepen the understanding of the hydrophic effect. 13,14 Schubert and Kaler 9 reported the phase diagrams of some F(CF 2 ) i (CH 2 CH 2 O) j H nonionic surfactants in microemulsion with water and PFOB, perfluorodecalin, or perfluorotetradecahydrophenanthrene. They described the microemulsion phase behavior and the existence of a liquid crystal phase region.…”