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Titolo:
A kinetic model for adsorption and transfer of ionic species at polarized liquid vertical bar liquid interfaces as studied by potential modulated fluorescence spectroscopy
Autore:
Nagatani, H; Fermin, DJ; Girault, HH;
Indirizzi:
Ecole Polytech Fed Lausanne, Dept Chim, Lab Electrochim, CH-1015 Lausanne,Switzerland Ecole Polytech Fed Lausanne Lausanne Switzerland CH-1015 nne,Switzerland
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 39, volume: 105, anno: 2001,
pagine: 9463 - 9473
SICI:
1520-6106(20011004)105:39<9463:AKMFAA>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
IMMISCIBLE ELECTROLYTE-SOLUTIONS; WATER NITROBENZENE INTERFACE; OPTICAL 2ND-HARMONIC GENERATION; ANION METHYL-ORANGE; ELECTROCHEMICAL INTERFACE; LIQUID/LIQUID INTERFACES; WATER/1,2-DICHLOROETHANE INTERFACE; ZINC PORPHYRINS; DOUBLE-LAYER; DYNAMICS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
43
Recensione:
Indirizzi per estratti:
Indirizzo: Girault, HH Ecole Polytech Fed Lausanne, Dept Chim, Lab Electrochim, CH-1015 Lausanne,Switzerland Ecole Polytech Fed Lausanne Lausanne Switzerland CH-1015 and
Citazione:
H. Nagatani et al., "A kinetic model for adsorption and transfer of ionic species at polarized liquid vertical bar liquid interfaces as studied by potential modulated fluorescence spectroscopy", J PHYS CH B, 105(39), 2001, pp. 9463-9473

Abstract

Fundamental expressions for analyzing potential modulated fluorescence (PMF) responses were derived within the framework of a phenomenological model for adsorption and transfer of ionic species across polarized liquid/liquidinterfaces. For small periodic perturbations of the Galvani potential difference, PMF signals can be linearized and the contribution of each process can be uncoupled it the frequency domain. The PMF response for kinetically controlled adsorption is expressed as a semicircle in the complex plane in which the characteristic frequency of maximum imaginary component is proportional to the adsorption and desorption rate constants. Considering that the potential dependence of adsorption exhibits opposite sign whether the process take place from the aqueous or organic phase, the corresponding PMF responses appear in different quadrants of the complex plane. The present model delivers useful diagnostic criteria for analyzing the nature of the various processes contributing to the periodic fluorescence response. The adsorption dynamics of mesotetrakis(N-methyl-4-pyridyl)porphyrinato zinc(U) at the water/1,2-dichloroethane interface were evaluated from the frequency dependent PMF responses. Studies performed at various Galvani potential differences clearly confirm that the adsorption can take place at two distinctiveplanes located at the aqueous and organic sides of the interface. Basic aspects in connection to the nature of the adsorption planes are briefly discussed.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/03/20 alle ore 23:12:37