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Author: jeffrey davis
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1. An Examination of Kernite (Na2B4O6(OH)2 , 3 H2O) Using X-ray and Electron Spectroscopies: Quantitative Microanalysis of a Hydrated Low-Z Mineral
Douglas C Meier, Jeffrey M Davis, Edward P. Vicenzi
Mineral borates, the primary industrial source of boron, are found in a large variety of compositions. One such source, kernite (Na2B4O6(OH)2 , 3 H2O), offers a panoply of challenges for traditional electron-probe microanalysis (EPMA) ‹ it is hygrosc ...
2. Bridging the Micro to Macro Gap: A New Application for
Milli-probe X-ray Fluorescence
Jeffrey M Davis, Dale E Newbury, Nicholas W m Ritchie, Edward P. Vicenzi, Dale P Bentz, Albert J. Fahey
X-ray elemental mapping and x-ray spectrum imaging are powerful microanalytical tools. However, their scope is limited spatially by the raster area of a scanning electron microscope or microprobe. Limited sampling size becomes a significant issue w ...
3. Detection and Speciation of Brominated Flame Retardants in Consumer Products and Household Dust
Richard D Holbrook, Jeffrey M Davis, Keana C k Scott, Christopher W Szakal
The ubiquitous presence of brominated flame retardants in humans, biota, and the environment has caused concerns about their toxicity, transformations, and persistence. Polymeric materials, which often are intercalated with include brominated flame ...
4. Fluorinated Copolymer Nanoparticles for Multimodal Imaging Applications
Mark M. Bailey, Christine M. Mahoney, Elodie Dempah, Jeffrey M Davis, Matthew Becker, Supang Khondee, Eric J. Munson, Cory J. Berkland
Nanomaterials have emerged as valuable tools in biomedical imaging techniques, such as magnetic resonance imaging (MRI), fluorescence, positron emission tomography (PET), and others. Some have been designed to serve as multimodal imaging agents, com ...
5. Influence of Internal Curing and Viscosity Modifiers on Resistance to Sulfate Attack
Dale P Bentz, Jeffrey M Davis, Max A Peltz, Kenneth Alan Snyder
Sulfate attack is one of the common degradation mechanisms for concrete in severe environments. While various strategies for minimizing sulfate attack are well recognized, including using an ASTM C150 Type V cement and/or reducing water-to-cementitio ...
6. Modeling Chloride transport in Cracked Concrete: A 3-D image-based microstructure simulation
Edward Joseph Garboczi, Dale P Bentz, Jeffrey M Davis, Yang Lu
The prediction of the service life of concrete materials is difficult, mainly because of their complex heterogeneous microstructure and their random nature. Studying the presence of cracks in concrete and their effect on chloride transport and reacti ...
7. Pilot Estuarine Mesocosm Study on the Environmental Fate of Silver
Nanomaterials Leached from Consumer Products
Danielle Cleveland, Stephen E Long, Paul L. Pennington, Emily Cooper, Michael H. Fulton, Geoffrey I. Scott, Elijah J Petersen, Timothy M Brewer, Jeffrey M Davis, Laura J Wood
Although nanosilver consumer products (CPs) now enjoy widespread availability, little work has been done to determine the environmental fate and leaching of silver nanoparticles (AgNPs) from these products. This type of work is crucial, since the lif ...
8. Using Viscosity Modifiers to Reduce Effective Diffusivity in Mortars
Kenneth Alan Snyder, Dale P Bentz, Jeffrey M Davis
Three viscosity modifiers (a commercial shrinkage-reducing admixture, a polypropylene
glycol, and cellulose ether) are used to reduce the effective diffusivity of chloride ions through
mortars during a one-year exposure. Two delivery mechanisms ...
9. VERDiCT: Viscosity Enhancers Reducing Diffusion in Concrete Technology
Dale P Bentz, Max A Peltz, Kenneth Alan Snyder, Jeffrey M Davis
Our nation's infrastructure and long term containment of nuclear waste are two critical applications requiring concrete with an increased service life. In this paper, a new paradigm for increasing concrete service life is presented. Since diffusion ...