Search results for: E. Torralba

Items from 1 to 10 out of 10 results

article

Sensing and characterization of neurotransmitter 2-phenylethylamine based on facilitated ion transfer at solvent polymeric membranes using different electrochemical techniques

J.A. Ortuño, J.M. Olmos, E. Torralba, A. Molina

Sensors & Actuators: B. Chemical > 2016 > 222 > Complete > 930-936

Square wave voltammetry (SWV), chronoamperometry and chronocoulometry are exploited to take advantage of their different performance characteristics in the determination, characterization and sensing of the neurotransmitter 2-phenylethylamine (PEA), based on the ion transfer of its protonated form at a solvent polymeric membrane facilitated by dibenzo-18-crown-6 (DB18C6). The general voltammetric...

article

Advances in Copper Electrodeposition in Chloride Excess. A Theoretical and Experimental Approach

P. Sebastián, E. Torralba, E. Vallés, A. Molina, more

Electrochimica Acta > 2015 > 164 > Complete > 187-195

This is an in depth study in the knowledge of the nucleation and growth mechanism that governs copper electrodeposition in excess chloride media. In these conditions copper electro-reduction takes place via two well-separated steps, since the Cu(I) intermediate is stabilized through chloride complexation. The process was studied in two media, a deep eutectic solvent (DES) based on a mixture of urea...

article

Large Stokes shift downshifting Eu(III) films as efficiency enhancing UV blocking layers for dye sensitized solar cells

M. Kennedy, H. Ahmed, J. Doran, B. Norton, more

physica status solidi (a) > 212 > 1 > 203 - 210

Large Stokes shift downshifting organolanthanide complex, Eu(tta)₃phen, is examined for inclusion in polymeric layers to replace the UV blocking layer in dye sensitized solar cell (DSSC) technology. The UV blocking layer increases stability but power conversion efficiency decreases as incident UV photons are not converted into photocurrent. Eu(tta)₃phen doped polymeric film are prepared and attached...

article

Facilitated ion transfer of protonated primary organic amines studied by square wave voltammetry and chronoamperometry

E. Torralba, J.A. Ortuño, A. Molina, C. Serna, more

Analytica Chimica Acta > 2014 > 826 > Complete > 12-20

The transfer of the protonated forms of heptylamine, octylamine, decylamine, procaine and procainamide facilitated by dibenzo-18-crown-6 from water to a solvent polymeric membrane has been investigated by using cyclic square wave voltammetry. The experimental voltammograms obtained are in good agreement with theoretical predictions. The values of the standard ion transfer potential, complexation constant...

article

Analytical solution for the facilitated ion transfer at the interface between two immiscible electrolyte solutions via successive complexation reactions in any voltammetric technique: Application to square wave voltammetry and cyclic voltammetry

A. Molina, E. Torralba, C. Serna, J.A. Ortuño

Electrochimica Acta > 2013 > 106 > Complete > 244-257

Simple, analytical and explicit expressions are presented for the I/E response, interfacial concentrations and concentration profiles for the reversible ion transfer at ITIES of an ion undergoing several equilibrium complexation reactions in both the aqueous and the organic phase. Semi-infinite planar diffusion and excess of ligand in the organic phase have been assumed. These equations are valid...

article

Characterization of follow-up chemical reactions by reverse pulse voltammetry. An analytical solution for spherical electrodes and microelectrodes

A. Molina, E. Laborda, F. Martínez-Ortiz, E. Torralba, more

Electrochimica Acta > 2013 > 87 > Complete > 416-424

The study of the EC mechanism by reverse pulse voltammetry (RPV) is assessed in this paper. RPV is a pulse technique very well suited to the investigation of the products of an electrode process and in particular the quantitative characterization of the homogeneous chemical reaction involving the electrode product(s).A readily applicable analytical solution for the RPV response of the EC mechanism...

article

Study of ion transfer through liquid membrane systems by Current Reversal Chronopotentiometric techniques

E. Torralba, A. Molina, J.A. Ortuño, C. Serna, more

Journal of Electroanalytical Chemistry > 2011 > 661 > 1 > 219-225

General analytical equations are given for the E–t and dt/dE–E responses for the uptake and stripping of a target ion when Current Reversal Chronopotentiometry and Cyclic Reciprocal Derivative Chronopotentiometry with constant current are applied to liquid membrane systems of one and two polarized interfaces. Theoretical expressions for the peak coordinates of both uptake and stripping processes are...

article

Application of Current Fluxes to the Characterization of Ion Transfer at Solvent Polymeric Membranes with One and Two Polarized Interfaces

E. Torralba, J. A. Ortuño, C. Serna, J. González, more

Electroanalysis > 23 > 9 > 2188 - 2196

Chronopotentiometric and reciprocal derivative chronopotentiometric E–t, dt/dE–E and dI/dE–E responses are analyzed for the ion transfer of a series of tetraalkylammonium cations and tricyclic catamphiphilic drugs, driven by an exponential and a constant current flux in a liquid membrane system of one and two polarized interfaces. Reciprocal derivative chronopotentiometry shows a strong resolving...

article

Advances in the Study of Ion Transfer at Liquid Membranes with Two Polarized Interfaces by Square Wave Voltammetry

A. Molina, J. A. Ortuño, C. Serna, E. Torralba, more

Electroanalysis > 22 > 14 > 1634 - 1642

A general analytical expression has been deduced for the I/E response of the square wave voltammetry corresponding to ion transfer processes in systems with two liquid/liquid polarized interfaces. This expression has been evaluated through the experimental study of a series of quaternary ammonium cations and metal chloro complex anions. We have found that systems with two liquid/liquid polarizable...

article

Differential Pulse Voltammetry for Ion Transfer at Liquid Membranes with Two Polarized Interfaces

A. Molina, C. Serna, J. A. Ortuño, J. Gonzalez, more

Analytical Chemistry > 2009 > 81 > 11 > 4220 - 4225

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