个人简介

Education Background B. S. , 1980, University of Wyoming Ph.D., 1984, New Mexico State University (Advisor: Joseph Wang) Postdoctoral, 1984-1986, University of Cincinnati (Advisors: William R. Heineman and Richard C. Elder) Experience Assistant Professor, 1986-1993, Ohio University Associate Professor, 1993-1999, Ohio University Professor, 1999-, Ohio University Associate Dean, 7/2002-6/2011, College of Arts and Sciences, Ohio University Interim Dean, 7/2011-7/2012, College of Arts and Sciences, Ohio University Senior Associate Dean, 8/2012- College of Arts and Sciences, Ohio University

研究领域

Analytical Chemistry

Our research program is directed around the use of voltammetric electroanalytical techniques for both applied and fundamental research problems. Stripping Analysis is a means to typically determine trace heavy metal ion concentrations in clinical, environmental, and forensic applications, and constitutes a major use in our laboratories. Research in progress includes analysis of gunshot residue (GSR) for antimony, lead, and barium. Also, metallic ions present in acid mine drainage in locally impacted water bodies, such as Monday Creek, are being monitored. LCEC (liquid chromatography combined with amperometric electrochemical detection) is being used in the analysis of isoflavones and coumarins. These compounds are natural plant products. The coumarins are responsible for astringency and fragrances. The isoflavones possess both estrogenic and anti-cancer properties. Electrochemical oscillatory, nonlinear dynamics and chaos observed in the oxidation of copper electrodes in acetate solutions has been under study for several years. The control of chaos and stabilization of periodic oscillations and the chemical analysis and interpretation of the oscillatory processes continue to be of interest. Lithium ion batteries have recently become a new focus for the research group. We are investigating the oxidation of the graphite-coated copper electrode current collectors in LiPF6-organic carbonates battery electrolyte/solvent.

近期论文

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Electrochemical Stability of Graphite-Coated Copper in Lithium-Ion Battery Electrolytes. Zhao, M.; Dewald, H. D.; Lemke, F. R.; Staniewicz, R. J. J. Electrochem. Soc. 2000, 147(11), 3983-3988. (CA 134:44439q) Voltammetry of Coumarins. Wu, Q.; Dewald, H. D. Electroanalysis 2001, 13(1), 45-48. (CA 134:138350f) Stripping Voltammetry of Barium Ion in the Presence of Lead. Woolever, C. A.; Dewald, H. D. Electroanalysis 2001, 13(4), 309-312. (CA 134:289631z) Differential Pulse Anodic Stripping Voltammetry of Barium and Lead in Gunshot Residues. Woolever, C. A.; Dewald, H. D. Forensic Sci. Int. 2001, 117(3), 185-190. (CA 134:336813b) Stripping Potentiometry of Indium in Aqueous Chloride Solutions. Wilson, M. M.; Dewald, H. D. Microchem. J. 2001, 69(1), 13-19. (CA 134:275063d) Stripping Potentiometry of Barium Ion in Mixed Aqueous Tetraethylammonium Bromide / Ethanol Solutions. McIntire, K. M.; Dewald, H. D. Microchem. J. 2001, 69(1), 21-26. (CA 134:275064e) The Effect of Different Salts of Sodium and Potassium on the Accumulation of Glycinebetaine in Atriplex prostrata. Egan, T. P.; Dewald, H. D.; Ungar, I. A. Biol. Plant. 2001, 44(4), 595-597. (CA 136:34919y) Open-Circuit Voltage Study of Graphite-Coated Copper Foil Electrodes in Lithium-Ion Battery Electrolytes. Zhao, M.; Xu, M.; Dewald, H. D.; Staniewicz, R. J. J. Electrochem. Soc. 2003, 150(1), A117-A120. (CA 138:323924) Quantitation of the Dissolution of the Graphite-Coated Copper Foil in Lithium-Ion Battery Electrolytes by Flame Atomic Absorption Spectroscopy. Zhao, M.; Dewald, H. D.; Staniewicz, R. J. Electrochim. Acta 2004, 49(5), 677-681. (CA 140:289863) Quantitation of the Dissolution of Battery-Grade Copper Foils in Lithium-Ion Battery Electrolytes by Flame Atomic Absorption Spectroscopy. Zhao, M.; Dewald, H. D.; Staniewicz, R. J. Electrochim. Acta 2004, 49(5), 683-689. (CA 140:289864) Mass-Transfer Enhancement in Large-Diameter Pipeline under Water/Gas Stationary Slug Flow. Wang, H.; Dewald, H. D.; Jepson, W. P. J. Electrochem. Soc. 2004, 151(3), B114-B123. (CA 140:202150) Current Oscillations in Anodic Electrodissolution of Copper in Lithium-Ion Battery Electrolyte. Cui, Q.; Dewald, H. D. Electrochim. Acta 2005, 50(12), 2423-2429. (CA 142:453347) Controlled-Potential Electrolysis of Copper Foil and Graphite-Coated Copper Foil in a Nonaqueous 1 M LiPF6 in a Ternary Organic Carbonate Solvent. Xu, M.; Dewald, H. D. Microchem. J. 2005, 81(2), 225-229. (CA 143:389699) Impedance Studies of Copper Foil and Graphite-Coated Copper Foil Electrodes in Lithium-Ion Battery Electrolyte. Xu, M.; Dewald, H. D. Electrochim. Acta 2005, 50(27), 5473-5478. (CA 143:448141) Current Oscillations during Copper Electrodissolution under Solution Sparging in Acidic NaCl Solutions. Cui, Q.; Dewald, H. D. Microchem. J. 2007, 86(1), 80-88. (CA 147:510106) Online Coupling of Electrochemical Reactions with Liquid Sample Desorption Electrospray Ionization-Mass Spectrometry. Li, J.; Dewald, H. D.; Chen, H. Anal. Chem. 2009, 81(23), 9716-9722. (CA 151:523373) Online Mass Spectrometric Analysis of Proteins/Peptides Following Electrolytic Cleavage of Disulfide Bonds. Zhang, Y.; Dewald, H. D.; Chen, H. J. Proteome Res. 2011, 10(3), 1293-1304. (CA 154:329902) Coupling of Liquid Chromatography with Mass Spectrometry by Desorption Electrospray Ionization (DESI). Zhang, Y.; Yuan, Z.; Dewald, H. D.; Chen, H. Chem. Commun. 2011, 47(14), 4171-4173. (CA 154:559786) Electrochemistry-Assisted Top-Down Characterization of Disulfide-Containing Proteins. Zhang, Y.; Cui, W.; Zhang, H.; Dewald, H. D.; Chen, H. Anal. Chem. 2012, 84(8), 3838-3842. Study of Electrochemical Reactions Using Nanospray Desorption Electrospray Ionization Mass Spectrometry. Liu, P.; Lanekoff, I. T.; Laskin, J.; Dewald, H. D.; Chen, H. Anal. Chem. 2012, 84(13), 5737-5743.