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Titolo:
The effects of divalent ions on Langmuir monolayer and subphase structure:A grazing-incidence diffraction and Bragg rod study
Autore:
Kmetko, J; Datta, A; Evmenenko, G; Dutta, P;
Indirizzi:
Northwestern Univ, Dept Phys & Astron, Evanston, IL 60208 USA NorthwesternUniv Evanston IL USA 60208 & Astron, Evanston, IL 60208 USA
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 44, volume: 105, anno: 2001,
pagine: 10818 - 10825
SICI:
1520-6106(20011108)105:44<10818:TEODIO>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
AIR-WATER-INTERFACE; X-RAY-DIFFRACTION; BLODGETT-FILMS; ACID MONOLAYER; SYNCHROTRON; CATIONS; GROWTH; ORDER;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
27
Recensione:
Indirizzi per estratti:
Indirizzo: Kmetko, J Northwestern Univ, Dept Phys & Astron, Evanston, IL 60208 USA Northwestern Univ Evanston IL USA 60208 Evanston, IL 60208 USA
Citazione:
J. Kmetko et al., "The effects of divalent ions on Langmuir monolayer and subphase structure:A grazing-incidence diffraction and Bragg rod study", J PHYS CH B, 105(44), 2001, pp. 10818-10825

Abstract

Divalent ions dissolved in the aqueous subphase of fatty acid Langmuir monolayers have two types of effects on the structure of the organic film. Thefirst and more familiar effect is to induce a structure similar to the high-pressure "S" phase on pure water, even at low pressures; ions of the first type include Ni2+ (aq), Ball(aq), Co2+(aq), and Cu2+(aq). The presence ofions of the second type results in the appearance of superlattice structures: we see a 1 x 2 superlattice with Mn2+(aq) and a 2 x 2 superlattice withMg2+(aq), and it is known that Cd2+(aq) and Pb2+(aq) also cause the formation of superlattices. Out-of-plane (Bragg rod) scans indicate that Mn2+(aq)and Mg2+(aq) interact with the headgroups so strongly that the organic film buckles, with a periodic out-of-plane density modulation (amplitude similar to2.5 Angstrom). In addition, a thin (similar to4 Angstrom) ordered inorganic layer forms in the subphase under the Langmuir film.

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Documento generato il 30/09/20 alle ore 09:35:47