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Titolo:
DIELECTRIC-SPECTROSCOPY ANALYSIS ON THE INTERFACIAL COMPOSITION OF NONIONIC MICELLAR SOLUTIONS
Autore:
BRIGANTI G; BONINCONTRO A;
Indirizzi:
UNIV ROMA LA SAPIENZA,DEPT PHYS,P ALDO MORO 2 I-00185 ROME ITALY
Titolo Testata:
Colloids and surfaces. A, Physicochemical and engineering aspects
fascicolo: 1-2, volume: 103, anno: 1995,
pagine: 105 - 110
SICI:
0927-7757(1995)103:1-2<105:DAOTIC>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
POLY(ETHYLENE OXIDE) CHAINS; AQUEOUS-SOLUTIONS; NONIONIC SURFACTANTS; PHASE-SEPARATION; LIGHT-SCATTERING; SELF-DIFFUSION; AMPHIPHILES; BEHAVIOR; SHAPE; C12E6;
Keywords:
DIELECTRIC SPECTROSCOPY; NONIONIC MICELLAR SOLUTIONS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
28
Recensione:
Indirizzi per estratti:
Citazione:
G. Briganti e A. Bonincontro, "DIELECTRIC-SPECTROSCOPY ANALYSIS ON THE INTERFACIAL COMPOSITION OF NONIONIC MICELLAR SOLUTIONS", Colloids and surfaces. A, Physicochemical and engineering aspects, 103(1-2), 1995, pp. 105-110

Abstract

By iterative use of a suitable mixture equation for the dielectric permittivity of heterogeneous systems we investigate C(12)E(6) solutionsas a function of the monomer concentrations and of the temperature atfour different solvent compositions: 0, 2, 4 and 6 molar urea in water. With this methodology we obtain the permittivity of the micellar head group crown termination as a function of the hydrated volume of themonomer head group, composed in our case by 6 PEO (polyethylene oxide) units and by the interdigitated solvent molecules. Then the intercept between the dielectric behaviour as a function of the PEO molar concentration of the micellar crown region and of a solution of PEG-water-urea gives an estimate of the actual composition within the interface,at a fixed temperature and solvent composition. Our results suggest atemperature dependence of the degree of hydration at the micellar interface in pure water solution. With mixed water-urea solutions, cosolvent adsorbtion at the micellar interface is observed.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/09/20 alle ore 09:08:51