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National Repository of Grey Literature 3 records found  Search took 0.00 seconds. 
Electrochemical Impedence Spectroscopy and Steady-State Voltammetry at the Micro- between Two Immiscible Electrolyte Solution
 Silver, Barry Richard ; Holub, Karel ; Mareček, Vladimír
The kinetic data of simple tetraethylammonium ion transfer across the water/1,2-DCE interface obtained by electrochemical impedance spectroscopy and steady-state voltammetry are compared. It is shown that the geometry of the microcapillary tip region is of critical importance to obtain reliable kinetic data. Quasi-reversible behavior of the ion transfer reaction, corresponding to an apparent standard rate constant of about 0.2 cm s-1, is observed with both experimental methods.\n
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Noise Analysis of Ion Transfer Kinetics at the Micro Liquid/Liquid Interface
 Josypčuk, Oksana ; Holub, Karel ; Mareček, Vladimír
Fluctuation analysis was utilized to determine the TEA ion transfer kinetics across the water/1,2-dichloroethane interface. The average value ks = 0.34 cm s-1 is comparable with the previously reported value ks = 0.2 cm s-1, derived from electrochemical impedance spectroscopy experiments. The experimental approach utilizing a thick wall glass microcapillary to fix the interface exhibits a very small stray capacitance value, proving this system to be suitable for determining the kinetics of the fast ion transfer across a liquid/ liquid interface. Application of a method employing a small perturbation signal prevents polarization of the inner capillary surface by current flowing through the cell. The induced polarization of the capillary can affect ion concentration at the interface due to electroosmosis and thus make the kinetics data evaluation difficult or erroneous.
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Ion Current Enhancement at Glass Microcapillaries
 Silver, Barry Richard ; Holub, Karel ; Mareček, Vladimír
Ion conductivity has been investigated at a reusable borosilicate glass microcapillary using DC and AC electrochemical techniques. The ion current enhancement at low frequencies is modeled using a simple serial resistance – inductor circuit. The enhancement effect is ascribed to an electrokinetic mass transport process at the capillary wall.
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