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Open AccessArticle

Entropy Variation in the Two-dimensional Phase Transition of Anthracene Adsorbed at the Hg Electrode/Ethylene Glycol Solution Interface

Department of Chemistry, University of Modena and Reggio Emilia, Via Campi 183, 41125 Modena, Italy
Entropy 2010, 12(3), 570-577; https://doi.org/10.3390/e12030570
Received: 14 December 2009 / Revised: 25 February 2010 / Accepted: 11 March 2010 / Published: 16 March 2010
(This article belongs to the Special Issue Entropy in Model Reduction)
The adsorption of anthracene (C14H10), at the mercury electrode/ethylene glycol (EG) solution interface, is characterized by a low and almost constant capacity (about 8 μF cm−2) region (capacitive “pit” or “plateau”) in capacity vs. potential curves, upon selection of suitable values of temperature, bulk concentration and applied potential values. This result is rationalized assuming the occurrence of a 2D phase transition between two distinct adsorbed phases: (i) a “disordered” phase, characterized by a flat “parallel” disposition of the aromatic moiety on the electrode surface (ii) an “ordered” phase, characterized by a “perpendicular” disposition of the aromatic moiety on the electrode surface. The experimental evidence is rationalized by considering the chemical potential as an explicit function of the “electric field/adsorbed molecule” interaction. Such a modelistic approach enables the determination of the relevant standard entropy variation. View Full-Text
Keywords: phase transition; two dimensional; adsorption; anthracene phase transition; two dimensional; adsorption; anthracene
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Fontanesi, C. Entropy Variation in the Two-dimensional Phase Transition of Anthracene Adsorbed at the Hg Electrode/Ethylene Glycol Solution Interface. Entropy 2010, 12, 570-577.

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