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Determination of Ideal Broth Formulations Needed to Prepare Hydrous Aluminum Oxide Microspheres via the Internal Gelation Process

Description: A simple test-tube methodology was used to determine optimum process parameters for preparing hydrous aluminum oxide microspheres by the internal gelation process. Broth formulations of aluminum, hexamethylenetetramine, and urea were found that can be used to prepare hydrous aluminum oxide gel spheres in the temperature range of 60-90 C. A few gel-forming runs were made in which microspheres were prepared with some of these formulations in order to equate the test-tube gelation times with actua… more
Date: February 1, 2009
Creator: Collins, Jack Lee & Pye, S. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Determination of Ideal Broth Formulations Needed to Prepare Hydrous Cerium Oxide Microspheres via the Internal Gelation Process

Description: A simple test tube methodology was used to determine optimum process parameters for preparing hydrous cerium oxide microspheres via the internal gelation process.1 Broth formulations of cerium ammonium nitrate [(NH4)2Ce(NO3)6], hexamethylenetetramine, and urea were found that can be used to prepare hydrous cerium oxide gel spheres in the temperature range of 60 to 90 C. A few gel-forming runs were made in which microspheres were prepared with some of these formulations to be able to equate the … more
Date: February 1, 2009
Creator: Collins, Jack Lee & Chi, Anthony
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Determination of Ideal Broth Formulations Needed to Prepare Hydrous Hafnium Oxide Microspheres via the Internal Gelation Process

Description: A simple test-tube methodology was used to determine optimum process parameters for preparing hydrous hafnium oxide microspheres by the internal gelation process. Broth formulations of hafnyl chloride [HfOCl{sub 2}], hexamethylenetetramine, and urea were found that can be used to prepare hydrous hafnium oxide gel spheres in the temperature range of 70-90 C. A few gel-forming runs were made in which microspheres were prepared with some of these formulations in order to equate the test-tube gelat… more
Date: February 1, 2009
Creator: Collins, Jack Lee; Hunt, Rodney Dale & Simmerman, S. G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Synthesis and Evaluation of CO2 Thickeners Designed with Molecular Modeling

Description: The objective of this research was to use molecular modeling techniques, coupled with our prior experimental results, to design, synthesize and evaluate inexpensive, non-fluorous carbon dioxide thickening agents. The first type of thickener that was considered was associating polymers. Typically, these thickeners are copolymers that contain a highly CO{sub 2}-philic monomer, and a small concentration of a CO{sub 2}-phobic associating monomer. Yale University was solely responsible for the synth… more
Date: August 31, 2009
Creator: Enick, Robert; Beckman, Erick & Johnson, J. Karl
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Aqueous and gaseous nitrogen losses induced by fertilizer application

Description: In recent years concern has grown over the contribution of nitrogen (N) fertilizer use to nitrate (NO{sub 3}{sup -}) water pollution and nitrous oxide (N{sub 2}O), nitric oxide (NO), and ammonia (NH{sub 3}) atmospheric pollution. Characterizing soil N effluxes is essential in developing a strategy to mitigate N leaching and emissions to the atmosphere. In this paper, a previously described and tested mechanistic N cycle model (TOUGHREACT-N) was successfully tested against additional observation… more
Date: January 15, 2009
Creator: Gu, C.; Maggi, F.; Riley, W. J.; Hornberger, G. M.; Xu, T.; Oldenburg, C. M. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Bioremediation of Petroleum Hydrocarbon Contaminated Sites

Description: Bioremediation has been widely applied in the restoration of petroleum hydrocarbon-contaminated. Parameters that may affect the rate and efficiency of biodegradation include temperature, moisture, salinity, nutrient availability, microbial species, and type and concentration of contaminants. Other factors can also affect the success of the bioremediation treatment of contaminants, such as climatic conditions, soil type, soil permeability, contaminant distribution and concentration, and drainage… more
Date: March 30, 2009
Creator: Fallgren, Paul
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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