Electrochemical Investigations of Thermodynamic and Structural Aspects of the Interface Between Two Immiscible Electrolyte Solutions
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Date
1991-02
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Addis Ababa Universty
Abstract
Simple ion transfer across the immiscible water/o-nitrotoluene,
water/benzonitrile and water/o-dlchlorobenzene interfaces has been studied
using ac and dc cyclic vol\ammetry. The standard Gibbs energies of transfer
from water to the organic solvents for several ions have been determ ined. The
results are compared with theoretical values calculated using the model of ionic
solvation.
The transfer across the imm iscible water / nitrobenzene interface of
transition metal (Fe, Co, Ni, Cu and Zn) - terpyridine complexes has been
studied using ac and dc cyclic voltammetry, linear sweep voltammetry and
absorption spectroscopy. From the voltammetric measurements and convolution
integral analysis , thermodynamic and transport properties have been evaluated.
The transfer behaviour of cuprous ion across the water/l ,2-dlchloroethane
interface facilitated by 2,2' -biquinoline has been studied and the mechanisms
for the transfer process are proposed.
The structure of the electrical double layer at the water /o-nitrotoluene
and water/a-dichlorobenzene interfaces containing different base electrolytes
with different concentrations has been studied by impedance measurements. The
capacitance values obtained from experiments have been compared with the
values calculated from the Gouy- Chapman theory. AnalysiS of the results has
Indicated the absence of speCific adsorption at the water /0- nltrotoluene
in terf ace.
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Keywords
Immiscible Electrolyte Solutions