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Titolo:
Theory of phase separation of binary self-assembled films
Autore:
Aoki, K;
Indirizzi:
Fukui Univ, Dept Appl Phys, Fukui 9108507, Japan Fukui Univ Fukui Japan 9108507 niv, Dept Appl Phys, Fukui 9108507, Japan
Titolo Testata:
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
fascicolo: 1, volume: 513, anno: 2001,
pagine: 1 - 7
Fonte:
ISI
Lingua:
ENG
Soggetto:
ORGANIZED MOLECULAR ASSEMBLIES; SCANNING-TUNNELING-MICROSCOPY; CONTACT-ANGLE GONIOMETRY; MIXED-VALENCE STATES; TIN OXIDE ELECTRODES; THIOL MONOLAYERS; ALKANETHIOL MONOLAYERS; WETTING PROPERTIES; ALKYL MERCAPTANS; GOLD SURFACES;
Keywords:
self-assembled films; phase domains; desorption waves; statistical mechanics; Monte Carlo simulation; phase formation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
57
Recensione:
Indirizzi per estratti:
Indirizzo: Aoki, K Fukui Univ, Dept Appl Phys, 3-9-1 Bunkyo, Fukui 9108507, Japan Fukui Univ 3-9-1 Bunkyo Fukui Japan 9108507 Fukui 9108507, Japan
Citazione:
K. Aoki, "Theory of phase separation of binary self-assembled films", J ELEC CHEM, 513(1), 2001, pp. 1-7

Abstract

The thermodynamic properties of self-assembled monolayer (SAM) films composed of long and short alkanethiol chains are predicted from the statisticalmechanical calculation and the dynamic Monte Carlo simulation, analogous to the Ising spin model in conjunction with interaction energy between the long and the short chains. Numbers of pairs of long-short chains are obtained for the interaction energy of the long-short chain and molar fractions. These relations are compared with the experimental result of binary SAMs, inwhich a small voltammetric wave appeared at a potential between two potentials of the desorbed reduction waves of long and short chains (J. Electroanal. Chem. 444 (1998) 113). The small wave can be ascribed to a new redox state generated by the interaction between the short and the long chains. Thecomparison estimates the interaction energy between the closest neighboring methylene groups to be 7.4 0 mol(-1) at 25 degreesC. A pair of long-shortchains is more unstable than pairs of long-long and short-short chains, and hence the long and short chains produce their own macroscopic phases. Monte Carlo simulation supports the appearance of the phase domains. (C) 2001 Elsevier Science B.V. All rights reserved.

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Documento generato il 04/07/20 alle ore 18:30:57