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Titolo:
Four-component micellar model for small-angle scattering applications: A SANS study of the core and counterion profiles of sodium alkyl sulfate micelles
Autore:
Vass, S;
Indirizzi:
Hungarian Acad Sci, KFKI Atom Energy Res Inst, H-1525 Budapest, Hungary Hungarian Acad Sci Budapest Hungary H-1525 nst, H-1525 Budapest, Hungary
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 2, volume: 105, anno: 2001,
pagine: 455 - 461
SICI:
1520-6106(20010118)105:2<455:FMMFSS>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
NEUTRON-SCATTERING; WATER; SURFACTANT; AGGREGATION; MIXTURES; BILAYERS; DENSITY; VOLUMES; CHARGE; NUMBER;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
35
Recensione:
Indirizzi per estratti:
Indirizzo: Vass, S Hungarian Acad Sci, KFKI Atom Energy Res Inst, POB 49, H-1525 Budapest, Hungary Hungarian Acad Sci POB 49 Budapest Hungary H-1525 dapest, Hungary
Citazione:
S. Vass, "Four-component micellar model for small-angle scattering applications: A SANS study of the core and counterion profiles of sodium alkyl sulfate micelles", J PHYS CH B, 105(2), 2001, pp. 455-461

Abstract

Multishell models used for calculating the elementary scattering amplitudefrom micelles are replaced by the Fourier transforms of the probability density functions of finding the hydrophobic (methyl and methylene) groups aswell as the headgroup and counterions at a particular distance from the micellar center. Model variables are the aggregation number and two width parameters respectively characterizing the Gaussian core and the exponential counterion profiles. Application of the model to almost spherical Sodium nonyl-, decyl and undecyl sulfate micelles leads to reasonable best-fit values. Aggregation numbers are tested by a recent thermodynamic model of micellization. Within the limits set by the finite resolution of the method, the group-density functions render possible to determine the spatial distribution of any physical quantity inside and around the micelles that depends onlyon the number of the molecular groups present. As an example, the relativedielectric permittivity is discussed.

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Documento generato il 04/04/20 alle ore 02:39:40