Reference

Triblock polymers of the BAB type having hydrophobic association capabilities for rheological control in aqueous systems

Triblock polymers of the BAB type having hydrophobic association capabilities for rheological control in aqueous systems. Rose, Gene D.; Dennis, Kent S.; Evani, Syamalarao (Dow Chemical Co., USA). U.S. US 4505827 A 19 Mar 1985, 7 pp. (English). (United States of America). CODEN: USXXAM. CLASS: ICM: E21B043-20. NCL: 252008550R. APPLICATION: US 83-533400 19 Sep 1983. DOCUMENT TYPE: Patent CA Section: 51 (Fossil Fuels, Derivatives, and Related Products) Section cross-reference(s): 38 Enhanced petroleum recovery systems for high-temp. reservoirs include sulfonated poly(vinyltoluene) or AB-type triblock sulfonated tert-butylstyrene-vinyltoluene copolymer (as thickers) and nonionic surfactants (i.e., pentaethylene glycol octyl ether [27252-75-1], pentaethylene glycol dodecyl ether [9002-92-0], or diethylene glycol monododecyl ether [3055-93-4]). The thickener and surfactants are present at 1 and 0.1 wt.% concns.

: Anisotropic surface melting in lyotropic cubic crystals

All Rights Reserved. : Anisotropic surface melting in lyotropic cubic crystals. Part 1: Pn3m/L1 interface, poor faceting. Grenier, J.; Plotzing, T.; Rohe, D.; Pieranski, P. (Laboratoire de Physique des Solides, Universite Paris-Sud, Orsay 91405, Fr.). European Physical Journal E: Soft Matter, 19(2), 223-232 (English) 2006 EDP Sciences. CODEN: EPJSFH. ISSN: 1292-8941. DOCUMENT TYPE: Journal CA Section: 75 (Crystallography and Liquid Crystals) : From expts. with ice or metal crystals in the vicinity of their crystal/liq./vapor triple points, it is known that melting of crystals starts on their surfaces and is anisotropic. : It is shown here by direct observations under an optical microscope that this anisotropic surface melting phenomenon occurs also in lyotropic systems. : In the case of a C12EO2/water mixt., it takes place in the vicinity of the peritectic Pn3m/L3/L1 triple point. : Above the peritectic triple point, where the Pn3m and L1 phases coexist in the bulk, the surface of a Pn3m-in-L1 crystal is composed of (111)-type facets surrounded by rough surfaces. : The angular junction suggests that rough surfaces are wet by an L3-like layer while facets stay "dry". : This is analogous to the pre-melting at rough surfaces in solid crystals. 3055-93-4 which is the cas registry number of one of substances is just one of reagents here. : Upon cooling below the peritectic triple point, where L3 and L1 phases coexist in the bulk, a thick layer of the L3 phase grows from the pre-melted, rough Pn3m/L1 interface. : Simultaneously, facets stay dry and their radius decreases. : In this tri-phasic configuration, stable in a narrow temp. range, the L3/L1 and L3/Pn3m interfaces have shapes of const. mean curvature surfaces having common borders: edges of facets. .