Paramagnetic effects in electrochemistry

Author

Amaladass Antonysamy

Keywords and Phrases

Paramagnetic body forces; Open circuit potential changes; Non-additive currents

Abstract

"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, F_gradC. While the former force has been well documented, F_gradC has remained elusive. First, we present the first-time experimental isolation of F_gradC 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, page iv.

Department(s)

Chemistry

Degree Name

Ph. D. in Chemistry

Comments

System requirements: Apple QuickTime, Microsoft Word, text editor.

Publisher

University of Missouri--Rolla

Publication Date

Spring 2005

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

Pagination

xv, 111 pages; CD-ROM

Note about bibliography

Includes bibliographical references.

Rights

© 2005 Amaladass Antonysamy, All rights reserved.

Document Type

Dissertation - Citation

File Type

text

Language

English

Subject Headings

Magnetic fieldsElectrochemistry

Thesis Number

T 8713

Print OCLC #

71122977

Recommended Citation

Antonysamy, Amaladass, "Paramagnetic effects in electrochemistry" (2005). Doctoral Dissertations. 1628.
https://scholarsmine.mst.edu/doctoral_dissertations/1628