Electrochemical and neutron reflectivity studies of spontaneously formed amphiphilic surfactant bilayers at the gold-solution interface

V. Zamlynny, I. Burgess, G. Szymanski, J. Lipkowski, J. Majewski, G. Smith, S. Satija, Robert Ivkov

Research output: Contribution to journalArticle

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 (M-S) interface of a Au(111) 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 or monolayer 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 the kinetics 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.

Original languageEnglish (US)
Pages (from-to)9861-9870
Number of pages10
JournalLangmuir
Volume16
Issue number25
DOIs
StatePublished - Dec 12 2000
Externally publishedYes

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Surface-Active Agents
Gold
Neutrons
Surface active agents
surfactants
gold
reflectance
neutrons
Gases
Metals
gases
metals
Contacts (fluid mechanics)
Electrodes
Molecules
electrodes
molecules
irreversible processes
Experiments
Surface reactions

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry

Cite this

Electrochemical and neutron reflectivity studies of spontaneously formed amphiphilic surfactant bilayers at the gold-solution interface. / Zamlynny, V.; Burgess, I.; Szymanski, G.; Lipkowski, J.; Majewski, J.; Smith, G.; Satija, S.; Ivkov, Robert.

In: Langmuir, Vol. 16, No. 25, 12.12.2000, p. 9861-9870.

Research output: Contribution to journalArticle

Zamlynny, V, Burgess, I, Szymanski, G, Lipkowski, J, Majewski, J, Smith, G, Satija, S & Ivkov, R 2000, 'Electrochemical and neutron reflectivity studies of spontaneously formed amphiphilic surfactant bilayers at the gold-solution interface', Langmuir, vol. 16, no. 25, pp. 9861-9870. https://doi.org/10.1021/la000022z
Zamlynny, V. ; Burgess, I. ; Szymanski, G. ; Lipkowski, J. ; Majewski, J. ; Smith, G. ; Satija, S. ; Ivkov, Robert. / Electrochemical and neutron reflectivity studies of spontaneously formed amphiphilic surfactant bilayers at the gold-solution interface. In: Langmuir. 2000 ; Vol. 16, No. 25. pp. 9861-9870.
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