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Titolo:
COADSORPTION OF SODIUM DODECYL-SULFATE AND DODECANOL AT A HYDROPHOBICSURFACE
Autore:
WARD RN; DAVIES PB; BAIN CD;
Indirizzi:
UNIV CAMBRIDGE,DEPT CHEM,LENSFIELD RD CAMBRIDGE CB2 1EW ENGLAND UNIV CAMBRIDGE,DEPT CHEM CAMBRIDGE CB2 1EW ENGLAND UNILEVER RES PORT SUNLIGHT LAB BEBINGTON L63 3JW WIRRAL ENGLAND UNIV OXFORD,PHYS & THEORET CHEM LAB OXFORD OX1 3QZ ENGLAND
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 9, volume: 101, anno: 1997,
pagine: 1594 - 1601
SICI:
1089-5647(1997)101:9<1594:COSDAD>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
SUM-FREQUENCY SPECTROSCOPY; AIR-WATER-INTERFACE; NORMAL-ALKYL CHAINS; H STRETCHING MODES; VIBRATIONAL SPECTROSCOPY; ORGANIC-SURFACES; LIQUID INTERFACE; NORMAL-ALKANES; GENERATION; MONOLAYER;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
51
Recensione:
Indirizzi per estratti:
Citazione:
R.N. Ward et al., "COADSORPTION OF SODIUM DODECYL-SULFATE AND DODECANOL AT A HYDROPHOBICSURFACE", JOURNAL OF PHYSICAL CHEMISTRY B, 101(9), 1997, pp. 1594-1601

Abstract

Sum-frequency spectroscopy has been used to study coadsorption of dodecanol and sodium dodecyl sulfate (SDS) at the interface between aqueous solutions and a monolayer of octadecanethiol on gold. Selective deuteration was employed to distinguish between the two adsorbed surfactants. Mixed monolayers were studied over a range of SDS concentrations with dodecanol present at a level of 1 mol %. The results are comparedwith other data published previously and with literature studies of the air/water interface. A quantitative analysis of the monolayer adsorbed from 6 mM SDS + 10 mu M dodecanol showed that the monolayer comprised 63% dodecanol and 37% SDS and had a packing density comparable to that of a monolayer of pure dodecanol. The composition of the monolayer was found to be isotope dependent. This dependence might arise from a highly surface active impurity in the SDS but can also be explained quantitatively by a lattice model of the monolayer within regular solution theory.

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Documento generato il 03/04/20 alle ore 07:58:05