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Titolo:
Electrochemical and neutron reflectivity studies of spontaneously formed amphiphilic surfactant bilayers at the gold-solution interface
Autore:
Zamlynny, V; Burgess, I; Szymanski, G; Lipkowski, J; Majewski, J; Smith, G; Satija, S; Ivkov, R;
Indirizzi:
Univ Guelph, Dept Chem & Biochem, Guelph, ON N1G 2W1, Canada Univ Guelph Guelph ON Canada N1G 2W1 Biochem, Guelph, ON N1G 2W1, Canada Univ Calif Los Alamos Natl Lab, Manuel Lujan Jr Neutron Scattering Ctr 12,Los Alamos, NM 87545 USA Univ Calif Los Alamos Natl Lab Los Alamos NM USA 87545 amos, NM 87545 USA Natl Inst Stand & Technol, Ctr Neutron Res, Gaithersburg, MD 20899 USA Natl Inst Stand & Technol Gaithersburg MD USA 20899 ersburg, MD 20899 USA
Titolo Testata:
LANGMUIR
fascicolo: 25, volume: 16, anno: 2000,
pagine: 9861 - 9870
SICI:
0743-7463(200012)16:25<9861:EANRSO>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
AU(111) ELECTRODE; ADSORPTION; MONOLAYERS; DIFFUSION; PYRIDINE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
22
Recensione:
Indirizzi per estratti:
Indirizzo: Lipkowski, J Univ Guelph, Dept Chem & Biochem, Guelph, ON N1G 2W1, Canada Univ Guelph Guelph ON Canada N1G 2W1 lph, ON N1G 2W1, Canada
Citazione:
V. Zamlynny et al., "Electrochemical and neutron reflectivity studies of spontaneously formed amphiphilic surfactant bilayers at the gold-solution interface", LANGMUIR, 16(25), 2000, pp. 9861-9870

Abstract

We have employed electrochemical and neutron reflectivity measurements to study the transfer of 4-pentadecyl-pyridine (C15-4Py), an insoluble amphiphilic surfactant, from the gas-solution (G-S) interface to the metal-solution IM-S) interface of a Au(lll) electrode. Neutron reflectivity experiments have demonstrated that C15-4Py forms a bilayer at the Au(111) electrode surface. Electrochemical experiments demonstrated that this bilayer is formed spontaneously when the electrode surface is brought in contact with the film-covered G-S interface. The surfactant molecules can move from the G-S to the M-S interface across the triple-phase boundary formed where the metal, solution, and gas phases are in contact. Time-dependence experiments have shown that the spreading process is irreversible. Having formed a bilayer ormonolayer at the M-S interface, the C15-4Py surfactant molecules do not move back to a film-free G-S interface. Three models were used to analyze thekinetics of spreading. Our results are best explained assuming that the spreading is a first-order surface reaction controlled by the activation barrier that the surfactant molecules have to overcome when crossing the triple-phase line.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/03/20 alle ore 23:04:38