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Titolo:
Total and free charge densities on mercury coated with self-assembled phosphatidylcholine and octadecanethiol monolayers and octadecanethiol/phosphatidylcholine bilayers
Autore:
Buoninsegni, FT; Becucci, L; Moncelli, MR; Guidelli, R;
Indirizzi:
Univ Florence, Dept Chem, I-50121 Florence, Italy Univ Florence FlorenceItaly I-50121 Dept Chem, I-50121 Florence, Italy
Titolo Testata:
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
fascicolo: 1-2, volume: 500, anno: 2001,
pagine: 395 - 407
Fonte:
ISI
Lingua:
ENG
Soggetto:
POLYCRYSTALLINE GOLD ELECTRODES; SCANNING-TUNNELING-MICROSCOPY; ALKANETHIOL MONOLAYERS; PHOSPHOLIPID MONOLAYERS; ELECTROCHEMICAL DESORPTION; REDUCTIVE DESORPTION; INTRINSIC PK(A); SINGLE-CRYSTAL; ADSORPTION; MEMBRANES;
Keywords:
total and free charge; dioleoylphosphatidylcholine; octadecanethiol; bilayers supported by Hg;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
51
Recensione:
Indirizzi per estratti:
Indirizzo: Guidelli, R Univ Florence, Dept Chem, Via G Capponi 9, I-50121 Florence, Italy Univ Florence Via G Capponi 9 Florence Italy I-50121 e, Italy
Citazione:
F.T. Buoninsegni et al., "Total and free charge densities on mercury coated with self-assembled phosphatidylcholine and octadecanethiol monolayers and octadecanethiol/phosphatidylcholine bilayers", J ELEC CHEM, 500(1-2), 2001, pp. 395-407

Abstract

The thermodynamic 'total' charge density is the charge to be supplied to the electrode to keep the applied potential constant when the electrode surface is increased by unity, while the extrathermodynamic 'free' charge density is the charge actually experienced by the diffuse layer ions. The total charge density at dioleoylphosphatidylcholine (DOPC) and octadecanethiol (ODT) monolayers and mixed ODT/DOPC bilayers self-assembled on mercury from aqueous solutions was determined from chronocoulometric single potential steps to a final potential negative enough to cause complete desorption of thefilm. The effect of different alkali metal ions and of tetramethylammoniumon DOPC desorption was examined. The total charge for ODT monolayers and ODT/DOPC bilayers, + 56 +/- 3 muC cm(-2), agrees with the value obtained by integration of the current under the reductive desorption voltammetric peaks, only provided the scan rate is higher than 100 mV s(-1). An approximate model of the interface of the ODT-coated electrode, which accounts for partial charge transfer from sulfur to mercury and for the degree of dissociation of the sulfhydryl group upon self-assembly, was employed to estimate thefree charge density. (C) 2001 Elsevier Science B.V. All rights reserved.

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Documento generato il 12/07/20 alle ore 11:31:57