Chett J. Boxley

University of Utah

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Henry S. White

University of Utah

Raina M. Maier

University of Arizona

Ryan M. Stolley

University of Utah

Sai Bhavaraju

nLIGHT (United States)

David E. Hogan

University of Arizona

J. J. Steppan

Vanderbilt University

Akash Akash

Post Graduate Institute of Medical Education and Research

John J. Watkins

Princeton University

Shekar Balagopal

United States Department of Commerce

A.B. Moldes

RWTH Aachen University

Cooperative Institutions

Ghent University

Sandia National Laboratories California

Universidad Nacional Autónoma de México

Sandia National Laboratories

National Technical Information Service

RWTH Aachen University

Office of Scientific and Technical Information

Argonne National Laboratory

Radiology Associates of Albuquerque

University of Arizona

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Relationship Between Al[sub 2]O[sub 3] Film Dissolution Rate and the Pitting Potential of Aluminum in NaCl Solution

Journal of The Electrochemical Society (2004)

Chett J. Boxley Henry S. White

The dissolution rate of the film, (mol/cm2 s), and the pitting potential, of polycrystalline Al electrodes were measured in 50 mM mM solutions (pH 6.7) containing between 0 and 200 mM NaCl. was determined by analysis of the transient current, using the high-field growth model, following a large amplitude potential step to induce film growth in competition with film dissolution. The dissolution rate of the oxide film increased from mol/cm2 s in the absence of to a quasi-limiting value of mol/cm2 s at concentrations above ∼100 mM. Over the same concentration range, shifted to more negative potentials with increasing concentration, also approaching a quasi-limiting value of ∼−0.95 V vs. mercury/mercuric sulfate (saturated at concentrations greater than ∼100 mM. The similar functional dependencies of and on concentration suggest a strong correlation between oxide film dissolution and oxide breakdown. © 2004 The Electrochemical Society. All rights reserved.

Limiting

10.1149/1.1695383

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Citations (22)

Electrochemical Deposition and Reoxidation of Au at Highly Oriented Pyrolytic Graphite. Stabilization of Au Nanoparticles on the Upper Plane of Step Edges

The Journal of Physical Chemistry B (2002)

Chett J. Boxley Henry S. White Tedd E. Lister P. J. Pinhero

The electrochemical deposition and reoxidation of Au on the basal plane of highly oriented pyrolytic graphite (HOPG) immersed in a 5 mM AuCl4-/6 M LiCl solution is reported. Scanning electron microscopy (SEM) and ex-situ atomic force microscopy (AFM) demonstrate that Au nanoparticles, ∼3.3 nm in height and ∼10 nm in diameter, are deposited at times less than ∼1 s. The density of nanoparticles, 6 × 109 cm-2, is of the same order of magnitude as the surface point defect density, suggesting that point defects act as nucleation sites for Au electrodeposition. A small subset of the Au nanoparticles (∼7%) continues to grow between 1 and 50 s, reaching a height of ∼150 nm and a diameter of ∼300 nm. At times greater than 50 s, the larger particles coalesce to yield a surface comprised of a low density (∼2 × 106 cm-2) of micrometer-size Au crystallites surrounded by Au nanoparticles. Double potential step chronocoulometric experiments demonstrate that the electrodeposition of Au is chemically irreversible, a finding supported by SEM and AFM observations of Au nanoparticles and larger crystallites on the surface after long periods of reoxidation (>3600 s). Au nanoparticles are observed to be preferentially deposited on the upper plane of step edges, a consequence of the nonuniform surface electron density that results from relaxation of the graphite lattice near steps.

Pyrolytic carbon

10.1021/jp026496j

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Treatment of fly ash for use in concrete

OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (2013)

Chett J. Boxley Akash Akash Qiang Zhao

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Sodium-based Battery Development Programmatic Overview.

David Ingersoll Kevin R. Zavadil Frank M. Delnick Erik David Spoerke Randall T. Cygan

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Practical Applications of Geopolymers

John Wiley & Sons, Inc. eBooks (2009)

Chett J. Boxley B.K.S. Nair P. Balaguru

This chapter contains sections titled: Introduction Hydrothermal Corrosion-Resistant Materials Fire-Resistant Coatings for Aircraft Geopolymers as Fire-Resistant Coatings for Modular Housing Conclusions Acknowledgements

10.1002/9780470339749.ch29

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CO.sub.2 utilization in electrochemical systems

OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (2013)

Chett J. Boxley Akash Akash Qiang Zhao

A process for treating fly ash to render it highly usable as a concrete additive. A quantity of fly ash is obtained that contains carbon and which is considered unusable fly ash for concrete based upon foam index testing. The fly ash is mixed with a quantity of spray dryer ash (SDA) and water to initiate a geopolymerization reaction and form a geopolymerized fly ash. The geopolymerized fly ash is granulated. The geopolymerized fly ash is considered usable fly ash for concrete according to foam index testing. The geopolymerized fly ash may have a foam index less than 40%, and in some cases less than 20%, of the foam index of the untreated fly ash. An optional alkaline activator may be mixed with the fly ash and SDA to facilitate the geopolymerization reaction. The alkaline activator may contain an alkali metal hydroxide, carbonate, silicate, aluminate, or mixtures thereof.

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Electrochemistry at Nanometer Length Scales

ACS symposium series (2004)

John J. Watkins Chett J. Boxley Henry S. White

We briefly describe two sets of electrochemical experiments whose success and interpretation require explicit consideration of the role of distance at nanometer length scales. In the first section, measurements of the influence of adsorbed Cl- on the dissolution rate of the ~2-nm-thick Al2O3 film on Al are reported, and analyzed in terms of the electric field across the oxide film. Knowledge of the potential-dependent film thickness, which varies by less than 1 nm during an experiment, is required to quantify dissolution rates. In the second section, we describe experiments using Pt electrodes to voltammetrically detect very small quantities (zeptomoles) of an electroactive species. Our strategy to detect such small amounts of analyte is based on shrinking the electrode size to nanometer length scales.

Nanometre

10.1021/bk-2005-0890.ch045

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Synthetic approaches to production of rhamnolipid and related glycolipids

Elsevier eBooks (2023)

Chett J. Boxley David E. Hogan Ryan M. Stolley Raina M. Maier

Rhamnolipid

10.1016/b978-0-323-91697-4.00011-9

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Bioinspired glycolipids: Metals interactions and aqueous-source metal recovery technologies

Elsevier eBooks (2023)

David E. Hogan Chett J. Boxley Ryan M. Stolley Raina M. Maier

Aqueous medium

10.1016/b978-0-323-91697-4.00003-x

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Nanoscale Imaging of the Electronic Conductivity of the Native Oxide Film on Titanium Using Conducting Atomic Force Microscopy

The Journal of Physical Chemistry B (2003)

Chett J. Boxley Henry S. White Catherine E. Gardner Julie V. Macpherson

Conducting atomic force microscopy (C-AFM) is used to visualize the heterogeneous electronic conductivity of the native oxide film (nominally a 2.9 nm thick TiO2 layer) on polycrystalline Ti electrodes (hereafter referred to as Ti/TiO2 electrodes). Ex situ C-AFM images of Ti/TiO2 electrodes recorded in air demonstrate that the electronic conductivity of the oxide film in contact with the underlying Ti grain boundaries is at least 200× higher than the conductivity of the oxide film on grain faces. The width of the conductive zone in the oxide film over grain boundaries is estimated to be less than 50 nm (resolution limited by the C-AFM tip size). Small islands of oxide exhibiting high electronic conductivity are also observed on topographically featureless regions of grain faces. The observed spatial variations in conductivity are tentatively attributed to the presence of defects (e.g., Ti3+ sites) and lower valence oxides (e.g., Ti2O3) in the native oxide film.

Titanium oxide

10.1021/jp034874u

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Citations (60)