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Titolo:
INTERFACIAL CONFORMATION AND COMPOSITION OF C(12)E(6) MICELLE IN WATER INFERRED BY DIELECTRIC-SPECTROSCOPY
Autore:
BRIGANTI G; BONINCONTRO A;
Indirizzi:
UNIV ROMA LA SAPIENZA,DEPT PHYS,ALDO MORO 2 I-00185 ROME ITALY
Titolo Testata:
Journal of non-crystalline solids
, volume: 172, anno: 1994,
parte:, 2
pagine: 1173 - 1177
SICI:
0022-3093(1994)172:<1173:ICACOC>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
POLY(ETHYLENE OXIDE) CHAINS; AQUEOUS-SOLUTIONS; NONIONIC SURFACTANTS; PHASE-SEPARATION; ERYTHROCYTES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
17
Recensione:
Indirizzi per estratti:
Citazione:
G. Briganti e A. Bonincontro, "INTERFACIAL CONFORMATION AND COMPOSITION OF C(12)E(6) MICELLE IN WATER INFERRED BY DIELECTRIC-SPECTROSCOPY", Journal of non-crystalline solids, 172, 1994, pp. 1173-1177

Abstract

An iterative use of a suitable mixture equation for dielectric permittivity of heterogeneous systems can give direct information on the permittivity of the micellar head group crown, composed in the present case of six PEO terminations and of interdigitated water molecules. The results are obtained giving as a free parameter the actual conformation of the head group chains, i.e., the thickness of the micellar crown,l(h), that defines the available volume for water molecules too. The dielectric behaviour of the crown region is compared with that obtained from PEG-water mixtures to estimate the actual value of l(h) at eachtemperature. The number of interdigitated water molecules per PEO unit, n(w), can then be extracted. The temperature dependence of l(h) andn(w) shows a saturation near the critical temperature.

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Documento generato il 24/10/20 alle ore 13:41:26