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Caleb Strepka

Institution
Pennsylvania State University

Projects

High-resolution 27Al MAS NMR of Weathered Clays and Hanford Sediments

Lead Institution
Pacific Northwest National Laboratory
Principal Investigator
Karl Mueller
Project type
Capability Research
In prior research at PNNL, kaolinite and montmorillonite minerals weathered under near-field exposure to simulated Hanford tank waste were examined with 10 kHz 27Al MAS NMR on the 17.61 T…

Binding Environment of Strontium-87 Nuclei
in DOE Waste Remediation Materials

Lead Institution
Pacific Northwest National Laboratory
Principal Investigator
Karl Mueller
Project type
Capability Research
In previous research with model inorganic systems, we found that DFS-QCPMG NMR on the 21.14 T spectrometer at PNNL provided significant sensitivity enhancements, permitting studies of 87Sr nuclei…

Surface Selective Studies of Olivine Dissolution by 1H-29Si and 25Mg MAS NMR

Lead Institution
Pacific Northwest National Laboratory
Principal Investigator
Karl Mueller
Project type
Capability Research
Mineral trapping is a proposed mechanism for sequestering atmospheric carbon dioxide, allowing permanent confinement of this greenhouse gas. However, the sequestration process requires readily…

High-Resolution 27Al and 133Cs NMR of Weathered Hanford Sediments

Lead Institution
Pacific Northwest National Laboratory
Principal Investigator
Karl Mueller
Project type
Large-Scale EMSL Research
Hanford vadose zone sediments (Hanford coarse, Hanford fine, and Ringold silt) have been weathered by reaction with a simulated Hanford tank waste leachate and examined with a wide array of…