David O. Wipf

article

Surface electroanalytical approaches to organic polymeric coatings

Eugene B Caldona, Dennis W Smith, David O Wipf

Polymer International > 70 > 7 > 927 - 937

Surface characterization techniques for organic polymeric coatings are numerous and diverse. Many of these techniques can provide physical information about how coating systems perform under certain environmental conditions, but they provide less mechanistic information on how they function as corrosion barriers. Since many coating failures are initiated from ionic diffusion through the coating and...

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Tuning the Copper(II)/Copper(I) Redox Potential for More Robust Copper‐Catalyzed C–N Bond Forming Reactions

James D. Cope, Henry U. Valle, Ruby S. Hall, Kathleen M. Riley, more

European Journal of Inorganic Chemistry > 2020 > 14 > 1278 - 1285

Complexes of copper and 1,10‐phenanthroline have been utilized for organic transformations over the last 50 years. In many cases these systems are impacted by reaction conditions and perform best under an inert atmosphere. Here we explore the role the 1,10‐phenanthroline ligand plays on the electronic structure and redox properties of copper coordination complexes, and what benefit related ligands...

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Protective action of semi-fluorinated perfluorocyclobutyl polymer coatings against corrosion of mild steel

Eugene B. Caldona, Dennis W. Smith, David O. Wipf

Journal of Materials Science > 2020 > 55 > 4 > 1796-1812

This study examines perfluorocyclobutyl (PFCB) aromatic ether polymers and demonstrates, for the first time, their potential as corrosion-resistant coatings. PFCB polymers are a distinct class of semi-fluorinated polymers that are based on thermal cyclopolymerization of aromatic trifluorovinyl ethers. They combine the flexibility and thermal stability of aromatic ethers with strong fluorocarbon linkages...

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Rapid determination of zeptomole quantities of Pb2+ with the mercury monolayer carbon fiber electrode

Grigore Munteanu, Sorin Munteanu, David O. Wipf

Journal of Electroanalytical Chemistry > 2009 > 632 > 1-2 > 177-183

This work describes and studies a process for electrolytic deposition of a mercury monolayer on a carbon fiber electrode. Exceptional sensitivity for the determination of Pb ²⁺ is demonstrated when the mercury-monolayer-on-carbon electrode (MMCFE) is used with fast (v>1kV/s) anodic stripping voltammetry. Investigation of the nature of the analytical signal revealed that the high sensitivity...

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Fabrication of Carbon-Encapsulated Mono- and Bimetallic (Sn and Sn/Sb Alloy) Nanorods. Potential Lithium-Ion Battery Anode Materials

Sang Ho Lee, Martin Mathews, Hossein Toghiani, David O. Wipf, more

Chemistry of Materials > 2009 > 21 > 11 > 2306 - 2314

article

Local electron transfer rate measurements on modified and unmodified glassy carbon electrodes

Robert C. Tenent, David O. Wipf

Journal of Solid State Electrochemistry > 2009 > 13 > 4 > 583-590

A natural and artificial distribution of electron transfer activity on glassy carbon electrodes can be observed and quantified by the use of scanning electrochemical microscopy (SECM). A large (sevenfold) spread in rate constant is found for randomly sampled sites on polished, untreated glassy carbon surfaces. Direct-mode oxidation with the SECM tip was used to produce small regions of oxidized carbon...

article

Imaging of Metal Ion Dissolution and Electrodeposition by Anodic Stripping Voltammetry−Scanning Electrochemical Microscopy

Mario A. Alpuche-Aviles, John E. Baur, David O. Wipf

Analytical Chemistry > 2008 > 80 > 10 > 3612 - 3621

article

Microparticle-based iridium oxide ultramicroelectrodes for pH sensing and imaging

Emad El-Deen M. El-Giar, David O. Wipf

Journal of Electroanalytical Chemistry > 2007 > 609 > 2 > 147-154

In this paper, we present a simple, relatively inexpensive, and reproducible method for the construction of iridium oxide (IrOx)-pH sensitive ultramicroelectrodes (UMEs). In this method, the pH sensing layer is based on an IrOx film formed by potential cycling of iridium microparticles (diameter <10μm) in 0.5M H ₂ SO ₄ at 3.0V/s. The IrOx-pH microsensors prepared this way are chemically...

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In Situ Electrochemical STM Study of the Coarsening of Platinum Islands at Double-Layer Potentials

Qingmin Xu, Ting He, David O. Wipf

Langmuir > 2007 > 23 > 17 > 9098 - 9103

article

Feedback Effects in Combined Fast-Scan Cyclic Voltammetry-Scanning Electrochemical Microscopy

Daniel S. Schrock, David O. Wipf, John E. Baur

Analytical Chemistry > 2007 > 79 > 13 > 4931 - 4941

article

Fast-scan cyclic voltammetry–scanning electrochemical microscopy

Luis Díaz-Ballote, Mario Alpuche-Aviles, David O. Wipf

Journal of Electroanalytical Chemistry > 2007 > 604 > 1 > 17-25

The use of fast scan cyclic voltammetry (FSCV) to generate images in scanning electrochemical microscopy is demonstrated. In the FSCV–SECM method a cyclic voltammogram is acquired at each grid point of the scanned area. Thus, each point in the SECM image is a data array rather than a single value. This provides a significant increase in the amount of data collected per scan and provides the ability...

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Voltammetry and surface analysis of AISI 316 stainless steel in chloride-containing simulated concrete pore environment

Lucien Veleva, Mario A. Alpuche-Aviles, Melissa K. Graves-Brook, David O. Wipf

Journal of Electroanalytical Chemistry > 2005 > 578 > 1 > 45-53

The study of passive layers grown on AISI 316 stainless steel in solutions that simulate concrete pore environments contaminated with Cl ⁻ is presented. Model solutions of saturated Ca(OH) ₂ and cement extract (CE) with and without the addition of 5g/L of NaCl are compared. Cyclic voltammetry (CV) shows different electrochemical responses of passive layers grown on samples immersed...

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Scanning Electrochemical Microscopy of Model Neurons: Constant Distance Imaging

Ruwan T. Kurulugama, David O. Wipf, Sara A. Takacs, Sirinun Pongmayteegul, more

Analytical Chemistry > 2005 > 77 > 4 > 1111 - 1117

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Scanning Electrochemical Microscopy of Model Neurons: Imaging and Real-Time Detection of Morphological Changes

Johanna M. Liebetrau, Heather M. Miller, John E. Baur, Sara A. Takacs, more

Analytical Chemistry > 2003 > 75 > 3 > 563 - 571

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Comparative cyclic voltammetry and surface analysis of passive films grown on stainless steel 316 in concrete pore model solutions

Lucien Veleva, Mario A. Alpuche-Aviles, Melissa K. Graves-Brook, David O. Wipf

Journal of Electroanalytical Chemistry > 2002 > 537 > 1-2 > 85 - 93

The study of passive layers grown on AISI 316 stainless steel in two model solutions, saturated Ca(OH) ₂ and cement extract (CE) solution, show that each solution simulates the concrete pore environment in a different way. A more resistant passive layer is formed in CE solution due to its distinctive composition, homogeneity, thickness and porosity. The CE-exposed sample withstood several...

article

Impedance Feedback Control for Scanning Electrochemical Microscopy

Mario A. Alpuche-Aviles, David O. Wipf

Analytical Chemistry > 2001 > 73 > 20 > 4873 - 4881

article

UV/ozone pretreatment of glassy carbon electrodes

Junfeng Zhou, David O. Wipf

Journal of Electroanalytical Chemistry > 2001 > 499 > 1 > 121 - 128

A commercial UV/ozone cleaning device is investigated for use in pretreating glassy-carbon (GC) electrodes. In combination with alumina polishing, UV/ozone pretreatment produces electrodes with high activity for oxidation of catecholamines and ascorbic acid. UV/ozone treatment also reverses the passivating effect of sonicating GC electrodes in protic solvents and minimizes adsorption of dopamine and...

article

UV/ozone pretreatment of glassy carbon electrodes

Junfeng Zhou, David O. Wipf

Journal of Electroanalytical Chemistry > 2001 > 499 > 1 > 121-128

A commercial UV/ozone cleaning device is investigated for use in pretreating glassy-carbon (GC) electrodes. In combination with alumina polishing, UV/ozone pretreatment produces electrodes with high activity for oxidation of catecholamines and ascorbic acid. UV/ozone treatment also reverses the passivating effect of sonicating GC electrodes in protic solvents and minimizes adsorption of dopamine and...

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Search results for: David O. Wipf

Surface electroanalytical approaches to organic polymeric coatings

Tuning the Copper(II)/Copper(I) Redox Potential for More Robust Copper‐Catalyzed C–N Bond Forming Reactions

Protective action of semi-fluorinated perfluorocyclobutyl polymer coatings against corrosion of mild steel

Rapid determination of zeptomole quantities of Pb2+ with the mercury monolayer carbon fiber electrode

Fabrication of Carbon-Encapsulated Mono- and Bimetallic (Sn and Sn/Sb Alloy) Nanorods. Potential Lithium-Ion Battery Anode Materials

Local electron transfer rate measurements on modified and unmodified glassy carbon electrodes

Imaging of Metal Ion Dissolution and Electrodeposition by Anodic Stripping Voltammetry−Scanning Electrochemical Microscopy

Microparticle-based iridium oxide ultramicroelectrodes for pH sensing and imaging

In Situ Electrochemical STM Study of the Coarsening of Platinum Islands at Double-Layer Potentials

Feedback Effects in Combined Fast-Scan Cyclic Voltammetry-Scanning Electrochemical Microscopy

Fast-scan cyclic voltammetry–scanning electrochemical microscopy

Voltammetry and surface analysis of AISI 316 stainless steel in chloride-containing simulated concrete pore environment

Scanning Electrochemical Microscopy of Model Neurons: Constant Distance Imaging

Scanning Electrochemical Microscopy of Model Neurons: Imaging and Real-Time Detection of Morphological Changes

Comparative cyclic voltammetry and surface analysis of passive films grown on stainless steel 316 in concrete pore model solutions

Impedance Feedback Control for Scanning Electrochemical Microscopy

UV/ozone pretreatment of glassy carbon electrodes

UV/ozone pretreatment of glassy carbon electrodes

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