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The influence of frequency on fractal dimension of adsorbed layers

Gašparović, Blaženka; Risović, Dubravko; Ćosović, Božena; Nelson, Andrew (2007) The influence of frequency on fractal dimension of adsorbed layers. Electrochimica Acta, 52 (7). pp. 2527-2534. ISSN 0013-4686

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Abstract

Alternating current (AC) voltammetry and electrochemical impedance spectroscopy are often the methods of choice for use in study of adsorption of organic molecules. The adsorption of organic molecules on interface may result in the formation of fractal structures, whose fractal dimension can be estimated using the method of scaling the hanging mercury drop electrode (HMDE). The aim of present study was to check whether the estimated fractal dimension, D (or for that matter the fractal ordering of the adsorbed layer) shows any correlation (dependence) with change of applied frequency, and second, to check the possibility to extend the method to broad frequency spectrum compatible with impedance spectroscopy. The investigation included two surfactants nonionic Triton-X-100 (T-X-100) and anionic sodium dodecyl sulfate (SDS) and alcohol tert-butanol. All measurements were performed on HMDE at thermodynamic equilibrium employing broad frequency spectrum. The validity of the approach was checked by measurements on pure electrolyte and by comparison with previously obtained results for fractal layers. The results of the investigations show that: (1) the method of scaling the HMDE to obtain the fractal dimension of adsorbed layer is compatible with impedance spectroscopy and the combination of these methods can be used as a powerful tool to investigate fractal aspect of adsorption of organic molecules ; (2) fractal ordering of adsorbed layer and the value of fractal dimension is not influenced by the frequency of applied sinusoidal voltage perturbations.

Item Type: Article
Uncontrolled Keywords: frequency dependence, adsorption, fractal analysis, impedance spectroscopy, Triton-X-100, sodium dodecyl sulfate, tert-butanol
Subjects: NATURAL SCIENCES > Physics
NATURAL SCIENCES > Chemistry
Divisions: Division for Marine and Enviromental Research
Division of Experimental Physics
Projects:
Project titleProject leaderProject codeProject type
Priroda organske tvari, interakcije s mikrokonstituentima i površinama u okolišuIrena Ciglenečki-Jušić098-0982934-2717MZOS
Organizacijski procesi i optičke interakcije u kondenziranim molekulskim sistemiDubravko Risović098-0982915-2899MZOS
Depositing User: Blaženka Gašparović
Date Deposited: 15 Jul 2016 12:14
Last Modified: 15 Jul 2016 12:14
URI: http://fulir.irb.hr/id/eprint/2940
DOI: 10.1016/j.electacta.2006.08.073

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