title: Superswollen microemulsions stabilized by shear and trapped by a temperature quench.
abstract: We studied the solubilization of oil in the C(16)E(8)/hexadecane/H(2)O system. Close to the phase inversion temperature (PIT), the system, at equilibrium, can form either homogeneous states (i.e., microemulsions) at high surfactant concentrations or three-phase states at lower concentrations. We show that, under gentle shear, at a line we named the clearing boundary (CB), located a few degrees below the PIT, the system is homogeneous regardless of the surfactant concentration. We relate this shift of the microemulsion boundary to shear-induced disruption of the asymmetric bicontinuous structure. Although this state quickly relaxes to equilibrium when shear is stopped, we show that it is still possible to trap it into a metastable state through a temperature quench. This method is the sub-PIT emulsification that we described in a previous work (Roger Langmuir 2010, 26, 3860-3867).
authors.affiliation: PMMH, CNRS UMR 7636, ESPCI, 10 rue Vauquelin, F 75231 Paris cedex 05, France. kevin.roger@espci.fr
authors.forename: Kevin
authors.initials: K
authors.lastname: Roger
authors.forename: Ulf
authors.initials: U
authors.lastname: Olsson
authors.forename: Malin
authors.initials: M
authors.lastname: Zackrisson-Oskolkova
authors.forename: Peter
authors.initials: P
authors.lastname: Lindner
authors.forename: Bernard
authors.initials: B
authors.lastname: Cabane