title: Multi-lamellar vesicle formation in a long-chain nonionic surfactant: C16E4/D2O system.
abstract: The temperature dependent rheological and structural behavior of a long-chain C(16)E(4) (tetraethylene glycol monohexadecyl ether) surfactant in D(2)O has been studied within the regime of low shear range. In the absence of shear flow, the system forms a lamellar liquid crystalline phase at relatively high temperatures. The present paper reports on the shear-induced multi-lamellar vesicle (MLV) formation in C(16)E(4)/D(2)O at 40 wt.% of surfactant in the temperature range of 40-55 °C. The transition from planar lamellar structure to multi-lamellar vesicles has been investigated by time-resolved experiments combining rheology and nuclear magnetic resonance (rheo-NMR), rheo small-angle neutron scattering (rheo-SANS) and rheometry. The typical transient viscosity behavior of MLV formation has been discovered at low shear rate value of 0.5s(-1).
authors.affiliation: Department of Chemistry, University of Calabria, via P. Bucci, cubo 14C, 87036 Rende, Italy. luigi.gentile@unical.it
authors.forename: Luigi
authors.initials: L
authors.lastname: Gentile
authors.forename: Kell
authors.initials: K
authors.lastname: Mortensen
authors.forename: Cesare Oliviero
authors.initials: CO
authors.lastname: Rossi
authors.forename: Ulf
authors.initials: U
authors.lastname: Olsson
authors.forename: Giuseppe A
authors.initials: GA
authors.lastname: Ranieri
mesh_terms: D017666:Deuterium Oxide / Q000737:chemistry; D044367:Phase Transition; D011092:Polyethylene Glycols / Q000737:chemistry*; D012212:Rheology; D013501:Surface-Active Agents / Q000737:chemistry*; D013696:Temperature; D014783:Viscosity
chemical_list: D013501:Surface-Active Agents; D011092:Polyethylene Glycols; D017666:Deuterium Oxide