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Titolo:
INTERFACIAL COMPOSITION AS A FUNCTION OF TEMPERATURE IN C12E6 AND C12E8 MICELLAR SOLUTIONS
Autore:
BRIGANTI G; BONINCONTRO A;
Indirizzi:
UNIV ROMA LA SAPIENZA,DEPT PHYS,INFM,PA MORO 5 I-00185 ROME ITALY
Titolo Testata:
Journal of non-crystalline solids
, volume: 235, anno: 1998,
pagine: 704 - 708
SICI:
0022-3093(1998)235:<704:ICAAFO>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
POLY(ETHYLENE OXIDE) CHAINS; DIELECTRIC-SPECTROSCOPY; NONIONIC SURFACTANTS; AQUEOUS-SOLUTIONS; PHASE-SEPARATION; WATER; AMPHIPHILES; SCATTERING; BEHAVIOR; SYSTEMS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
24
Recensione:
Indirizzi per estratti:
Citazione:
G. Briganti e A. Bonincontro, "INTERFACIAL COMPOSITION AS A FUNCTION OF TEMPERATURE IN C12E6 AND C12E8 MICELLAR SOLUTIONS", Journal of non-crystalline solids, 235, 1998, pp. 704-708

Abstract

In [CH3-[CH2]((i-1))-[O-CH2-CH2](j)-O-H] (CiEj) non-ionic surfactant solutions, at different temperatures depending on the different i,j monomer compositions, the micellar aggregates undergo a change in shape from sphere to rod. At higher temperatures a phase separation occurs. Recently we have developed a method to investigate the interfacial composition of non-ionic micellar solutions by means of dielectric spectroscopy. We applied this methodology to C12E6 water solutions and in this work we compare the results with those obtained from C12E8 water solutions. Differences are observed in the polyethyleneoxide (PEO) watercomposition at the interface for the two kinds of micellar aggregates. On increasing temperature to 40 degrees C, C12E8 dehydrates with a faster rate than C12E6, but in this temperature range C12E8 retains a spherical shape, whereas C12E6, between 15 degrees C and 20 degrees C, undergoes the sphere-rod transition. In C12E8, at 40 degrees C the PEOcomposition at the interface is close to the one expected for a complete dehydration. Above 40 degrees C the degree of hydration increases with temperature and micellar growth occurs. The phase separation seems to require a specific interfacial composition, despite the number ofPEO units per monomer of the suspended surfactant. (C) 1998 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/09/20 alle ore 19:06:48