Paramagnetic effects in electrochemistry
Keywords and Phrases
Paramagnetic body forces; Open circuit potential changes; Non-additive currents
"Magnetic fields in electrochemical systems head to magnetohydrodynamic stirring via the Lorenz force. However, solutions containing paramagnetic species (ions or molecules) will experience additional body forces, namely the field-gradient paramagnetic force, F[subscript gradB] and the concentration-gradient paramagnetic force, FgradC. While the former force has been well documented, FgradC has remained elusive. First, we present the first-time experimental isolation of FgradC from other competing magnetic forces, demonstrating that it is a body force proportional to |B|², acting along the concentration gradient of electrogenerated radicals and able to cancel the effects of gravity. Second, we present a comprehensive study of the magnetic field effect on the open circuit potential (OCP) of ferromagnetic electrodes (Fe, Co and Ni) in oxidizing solutions. By systematically varying parameters such as magnetic flux density, electrode size and orientation, and chemical composition of the corroding solution, we have concluded that the causative mechanism for the observed OCP changes in the magnetic field is a combination of magnetophoresis and the field-gradient paramagnetic force. Finally, we have studied redox-active multi-component systems where homogeneous reactions following heterogeneous electron transfer leads to non-additive voltammetric currents, with important implications for electroanalysis, with numerical simulations agreeing with experiment"--Abstract, leaf iv.
Ph. D. in Chemistry
University of Missouri--Rolla
Journal article titles appearing in thesis/dissertation
- Isolation and demonstration of the elusive concentration gradient paramagnetic force
- Magnetic field effects on the open circuit potential of ferromagnetic electrodes in corroding solutions
- Non-additive voltammetric currents from multicomponent systems of redox-active species
xv, 111 leaves; 1 CD-ROM (4 3/4 in.)
© 2005 Amaladass Antonysamy, All rights reserved.
Dissertation - Citation
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Full-text not available: Request this publication directly from Missouri S&T Library or contact your local library.http://laurel.lso.missouri.edu/record=b5639534~S5
Antonysamy, Amaladass, "Paramagnetic effects in electrochemistry" (2005). Doctoral Dissertations. 1628.