Venkatakrishnaiyer, S. (1970) Structure of electrical double layer at mercury/aqueous solution interface in presence of neutral adsorbed organic molecules. PhD thesis, Kerala University.

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Abstract

Studies on the structure of electrical double layer at the mercury/aqueous solution interface in the presence of five neutral organic molecules, viz., formaldehyde, formamide, benzene, naphthalene and cyclohexane have been carried out using capillary electrometer. The charge on the metal surface in the absence and presence of adsorbate of varying concentrations adsorbed have been evaluated using thermodynamics. Various isotherms for the adsorption of neutral molecules at the mercury/solution interface have been tested in the case of adsorption of organic molecules studied. From the adsorption data calculated, it is shown that the adsorption of formaldehyde, benzene, naphthalene and cyclohexane obeys Frumkin’s isotherm and the adsorption of formamide obeys Langmuir’s isotherm. An equation for the evaluation of the electrostatic free energy of adsorption based on the model for water molecules at the interface, proposed by Devanathan, has been derived. Quantitative theories concerning the effect of electric field on the adsorption have been discussed, laying stress on the field dependent orientation of the solvent at the interface. A model for explaining the fine structure of water at the interface has been proposed. The validity of the equation proposed by Devanathan for the evaluation of electrostatic free energy of adsorption has been tested by comparing the experimental curve for the variation of electrostatic free energy of adsorption with qm with the theoretically calculated curve. In the case of formaldehyde and formamide, there is good agreement on the cathodic side, but a slight deviation is noticed on the anodic side. In the case of benzene and naphthalene, marked deviations are observed both on the anodic and cathodic sides at high field strengths. The orientation of formaldehyde, formamide, benzene, naphthalene and cyclohexane in the adsorbed state and the relation between the slope of Frumkin isotherm plots and the heat of condensation of benzene, naphthalene and cyclohexane have been studied

Item Type:	Thesis (PhD)
Uncontrolled Keywords:	Electrical double layer; Mercury/aqueous solution interface
Subjects:	Electrodics and Electrocatalysis
Divisions:	UNSPECIFIED
Depositing User:	Dr. N Meyyappan
Date Deposited:	13 Jun 2012 05:31
Last Modified:	13 Jun 2012 05:31
URI:	http://cecri.csircentral.net/id/eprint/2835

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