National Repository of Grey Literature 5 records found  Search took 0.00 seconds. 
Determination of the Rate of Tetraethylammoniumion Transfer across the\nWater/1,2-DCE Interface with Steady-State Voltammetry at a Nano-ITIES
Silver, Barry Richard ; Holub, Karel ; Mareček, Vladimír
The rate of TEA+ ion transfer across the water/1,2-dichloroethane interface has been\nmeasured using steady-state cyclic voltammetry at a capillary with an orifice of nano-sized\ndimension. It was found that the average rate constant for TEA+ transfer from water to oil and\nfrom oil to water is 0.64 cm/s. The results are repeatable using the same capillary. This value\nis similar to that measured previously using electrochemical impedance spectroscopy and\nfluctuation analysis at the micro-interface.
Electrochemical Impedance Spectroscopy and Steady-State Voltammetry at the Micro-between Two Immiscible Electrolyte Solutions
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
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.
Ion Current Rectification Behavior at Novel Borosilicate Glass Capillaries
Silver, Barry Richard ; Holub, Karel ; Mareček, Vladimír
We present an easy methodology to produce novel, robust and reusable borosilicate glass microcapillaries. Using these capillaries we investigate ion current rectification behavior using DC and AC electrochemical techniques. We find that two non-ohmic behaviors can manifest. The presence of low frequency inductive loops on the Nyquist plot tentatively suggests electrokinetic mass transport processes may be present at the capillary wall.
The electrochemically-assisted growth of lysozyme crystals at the surface of platinum disc electrodes
Silver, Barry Richard ; Unwin, P. R.
The enhanced, rapid, and probably controllable growth of lysozyme crystals at the surface of platinum disc electrodes, using an applied current and a simplified crystallizing solution, is demonstrated. A mechanism based on electrochemically-induced "shifts" in solution conditions are suggested and briefly discussed within the context of the protein/precipitant phase diagram.

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