Gary E. Maciel
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View article: The Surface of Nanoparticle Silicon as Studied by Solid-State NMR
The Surface of Nanoparticle Silicon as Studied by Solid-State NMR Open
The surface structure and adjacent interior of commercially available silicon nanopowder (np-Si) was studied using multinuclear, solid-state NMR spectroscopy. The results are consistent with an overall picture in which the bulk of the np-S…
View article: Metal Oxide Surfaces and Their Interactions with Aqueous Solutions and Microbial Organisms
Metal Oxide Surfaces and Their Interactions with Aqueous Solutions and Microbial Organisms Open
During the past decade, interest in chemical reactions occurring at metal oxide-aqueous solution interfaces has increased significantly because of their importance in a variety of fields, including atmospheric chemistry, heterogeneous cata…
View article: Temperature effects on chemical structure and motion in coal. Final report
Temperature effects on chemical structure and motion in coal. Final report Open
The objective of this project was to apply recently developed, state-of-the-art nuclear magnetic resonance (NMR) techniques to examine in situ changes in the chemical structure and molecular/macromolecular motion in coal as the temperature…
View article: Temperature effects on chemical structure and motion in coal
Temperature effects on chemical structure and motion in coal Open
In this,report, we describe the first 1D and 2D {sup 1}H-{sup 1}H spin-exchange studies of coals based on {sup 1}H CRAMPS detection. We have designed and implemented a new 2D spin-exchange pulse sequence, which is able to probe complicated…
View article: Temperature effects on chemical structure and motion in coal. [Quarterly] report No. 9, [October 1--December 31, 1995]
Temperature effects on chemical structure and motion in coal. [Quarterly] report No. 9, [October 1--December 31, 1995] Open
The temperature range from RF heating has been extended. {sup 1}H CRAMPS and NMR are being used to study structural changes that occur in coal at high temperatures. CRAMPS experiments under RF heating conditions proved to be difficult; oth…
View article: Temperature effects on chemical structure and motion in coal. Quarterly report, July--September 1995
Temperature effects on chemical structure and motion in coal. Quarterly report, July--September 1995 Open
Research continued on the temperature effects on chemical structure and motion in coal. This report presents results on a new 2D spin diffusion experiment, an RF heating experiment, and some improvements in the software for NMR spectromete…
View article: Temperature effects on chemical structure and motion in coal. Quarterly report, April--June, 1995
Temperature effects on chemical structure and motion in coal. Quarterly report, April--June, 1995 Open
As described in previous reports, the effects of moderate temperatures (up to 230 C) is to increase molecular/macromolecular mobility in coals, as determined by {sup 1}H CRAMPS (Combined Rotation And Multiple Pulse Spectroscopy) measuremen…
View article: Advanced NMR approaches in the characterization of coal. [Quarterly] report No. 12, [April--June 1993]
Advanced NMR approaches in the characterization of coal. [Quarterly] report No. 12, [April--June 1993] Open
direct polarization (DP) approaches. CP and DP spin dynamics and their relationships to quantitation and spin counting were elucidated. {sup 1}H NMR studies, based on CRAMPS, dipolar dephasing and saturation with perdeuteropyridine, led to…
View article: Advanced NMR approaches in the characterization of coal. Final technical report, September 1, 1990--August 31, 1993
Advanced NMR approaches in the characterization of coal. Final technical report, September 1, 1990--August 31, 1993 Open
This project addressed two main goals and one much smaller one. The main goals were (1) to improve the significance, reliability and information content in high-resolution NMR (nuclear magnetic resonance) characterization of coal samples a…
View article: Advanced NMR approaches in the characterization of coal. [Quarterly] report No. 8
Advanced NMR approaches in the characterization of coal. [Quarterly] report No. 8 Open
The paper submitted earlier on the use of (bicyclo[3.2.1]4pyrrolidino-N-methyl-octan-8-one triflate) ({sup 13}CO-123) as a {sup 13}C intensity standard was accepted for publication. Subsequently, {sup 13}CO-321 was used in this manner for …
View article: Advanced NMR approaches in the characterization of coal. [Quarterly] report No. 9
Advanced NMR approaches in the characterization of coal. [Quarterly] report No. 9 Open
A considerable effort in this project during the past few months has been focussed on the development of {sup 1}H and {sup 13}C NMR imaging techniques to yield spatially-resolved chemical shift (structure) information on coal. In order to …
View article: Advanced NMR approaches in the characterization of coal
Advanced NMR approaches in the characterization of coal Open
The paper submitted earlier on the use of (bicyclo[3.2.1]4pyrrolidino-N-methyl-octan-8-one triflate) ([sup 13]CO-123) as a [sup 13]C intensity standard was accepted for publication. Subsequently, [sup 13]CO-321 was used in this manner for …
View article: Cadmium-113 NMR investigations of cadmium oxide
Cadmium-113 NMR investigations of cadmium oxide Open
1 1 3Cd NMR has been used to examine the Cd–CdO solid solution. A series of samples prepared under different conditions was analyzed for percent Cd(0) using a direct chemical analysis. Conduction electrons arising from the ionization of Cd…