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Award Abstract #0124001
Collaborative Research: NIRT: Surface Reactivity of Nanocrystalline Oxides and Oxyhydroxides: Implications for Processes in the Environment
| NSF Org: |
EAR
Division of Earth Sciences
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| Initial Amendment Date: |
August 28, 2001 |
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| Latest Amendment Date: |
June 8, 2007 |
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| Award Number: |
0124001 |
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| Award Instrument: |
Continuing grant |
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| Program Manager: |
David Lambert
EAR Division of Earth Sciences
GEO Directorate for Geosciences
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| Start Date: |
August 15, 2001 |
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| Expires: |
July 31, 2008 (Estimated) |
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| Awarded Amount to Date: |
$388480 |
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| Investigator(s): |
Moira Ridley moira.ridley@ttu.edu (Principal Investigator)
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| Sponsor: |
Texas Tech University
203 Holden Hall
Lubbock, TX 79409 806/742-3884
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| NSF Program(s): |
CERAMICS,
PETROLOGY AND GEOCHEMISTRY,
GEOLOGY & PALEONTOLOGY,
ENVIRONMENTAL ENGINEERING
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| Field Application(s): |
0000099 Other Applications NEC
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| Program Reference Code(s): |
OTHR, 1674, 0000
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| Program Element Code(s): |
1774, 1573, 1571, 1440
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ABSTRACT
EAR-0123967
EAR-123998
EAR-0124036
EAR-0124001
Crystals with nanometer-scale dimensions formed by chemical weathering and biomineralization reactions are found in rivers, lakes, oceans, soils, sediments, and atmospheric dust. Because of their novel size-dependent properties, nanoparticles may play disprotionately large roles in environmental processes. However, the variation of reactivity of geologically important nanomaterials with particle size has received little attention. The tendency of ions to adsorb onto nanocrystalline metal oxide surfaces is predicted to be size-dependent. Adsorption will be studied experimentally over the temperature range of 0 - 150 degrees C in gases and environmentally-relevant aqueous solutions. Models will be developed to quantitatively explain differences between results for nanoparticles and those obtained on macroscopic equivalents. If nanocrystals grow via oriented aggregations, as has been shown previously, adsorbed ions (e.g. phosphate, arsenate, and zinc adsorbed from solution onto iron oxyhydroxide surfaces), may be incorporated into point defects. This may represent an important environmental ion sequestration pathway, with direct relevance to the long-term fate of nutrients and contaminants. Coupling of aggregation and adsorption under controlled conditions may also provide a new approach for creation of synthetic materials with technologically interesting properties. Ion sequestration during nanocystal growth will be tested experimentally and explored via molecular modeling and simulation. Calorimetric studies designed to measure surface and adsorption energies will provide date to be used in models that will explore size-dependent reactivity. This proposal was submitted in response to the solicitation "Nanoscale Science and Engineering" (NSF 00-119).
PUBLICATIONS PRODUCED AS A RESULT OF THIS RESEARCH
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Finnegan, M.P., Ridley, M.K., Banfield, J.F., Wesolowski, D.J., and Zhang, H.. "Particle size effects on the proton induced surface charge of nanocrystalline anatase.," American Chemical Society, Annual Meeting, Orlando, FL., v.223, 2002, p. 149-GEOC.
Machesky M., Wesolowski D., Ridley M., Palmer D., Rosenqvist J., Lvov S., Fedkin M., Predota M., Vlcek L. and, Cummings P. "The Protonation Behavior of Metal Oxide Surfaces to Hydrothermal Conditions," 212th Meeting of the Electrochemical Society, Washington, DC,, 2007.
Machesky M.L., Ridley M.K., Wesolowski D., Palmer D., Pøedota M., Vlèek L., Kubicki J., Sofo J., Bandura A., Zhan Z., and Fenter P.. "The rutile (110)-electrolyte solution interface to 250°C: A surface complexation synthesis of titration, ab initio, MD, and X-ray spectroscopic results," Goldschmidt Conference, Cologne, Germany, 2007.
Machesky M.L., Ridley, M.K., Wesolowski, D.J., Palmer, D.A.. "The influence of temperature on ion
adsorption phenomena.," Goldschmidt Conference, Davos, Switzerland, August 18-23, 2002., 2002, p. A 472.
Machesky M.L., Ridley, M.K., Wesolowski, D.J., Palmer, D.A., Zhang, Z., Fenter, P.A. and Sturchio, N.C.. "The utility of in situ X-ray standing wave measurements to help constrain surface complexation
models.," American Geophysical Union, Fall Meeting, San Francisco, CA, USA, December 6-10, 2002., 2002, p. --.
Machesky, M.L., Wesolowski, D.J., Ridley, M.K., Palmer, D.A., and Anovitz, L.M. 2001.. "The ion adsorption properties of metal oxide surfaces under hydrothermal conditions.," American Chemical Society, Chicago, IL, USA, Fall meeting., v.222, 2001, p. 18-GEOC.
Machesky,M.L., Ridley, M.K., Wesolowski, D. J., Palmer, D.A., Zhang, Z., Fenter, P. and Sturchio, N.C.. "Proton-induced surface charge development at the rutile/aqueous Solution interface in RbCl media from 25 to 250 C.," American Chemical Society, Orlando, FL, USA, Spring meeting, v.223, 2002, p. 114-GEOC.
Ridley M.K., Machesky M.L., Blom D.A., Allard L.F., and Hackley V.A.. "Surface structural modeling at the solid-solution interface of nanocrystalline anatase.," Goldschmidt Conference, Cologne, Germany, 2007.
Ridley, M.K., Hackley, V.A., and Machesky, M.L.. "Characterization and Surface-Reactivity of Nanocrystalline Anatase in Aqueous Solutions.," Langmuir, v.22, 2006, p. 10972.
Ridley, M.K., Machesky, M.L. Wesolowski, D.J. and Palmer, D.A.. "Sorption of Neodymium versus
Strontium on Rutile Surfaces to Elevated Temperatures.," Geological Society of America Abstracts, v.34, 2002, p. 192.
Ridley, M.K., Machesky, M.L., Palmer, D.A. and Wesolowski, D.J.. "Potentiometric Studies of the Rutile-Water Interface: Hydrogen-Electrode Concentration-Cell vs Glass-Electrode Titrations.," Colloids and Surfaces A: Physicochemical and Engineering Aspects, v.204, 2002, p. 295-308.
Ridley, M.K., Machesky, M.L., Wesolowski, D.J., Finnegan, M.P., and Palmer, D.A.. "Surface Charge and Ion Sorption Properties of Titanium Dioxide.," American Geophysical Union, Fall Meeting, San Francisco, CA., v.82(47), 2001, p. V31B-04.
Ridley, M.K., Machesky, M.L., Wesolowski, D.J., and Palmer, D.A. "Modeling the surface complexation of calcium at the rutile-water interface to 250ºC," Geochim. Cosmochim. Acta, v.68, 2004, p. 239-251.
Ridley, M.K., Wesolowski, D. J., Machesky,M.L., Palmer, D.A., Zhang, Z., Fenter, P. and Sturchio, N.C.. "Interaction of Calcium and Strontium at the rutile-water interface from 25 to 250 C.," American Chemical Society, Orlando, FL, Spring meeting., v.223, 2002, p. 115-GEOC.
Wesolowski D., Machesky M., Ridley M., Palmer D., Rosenqvist J., Kubicki J., Predota M., Vlcek L., Cummings P., Zhang Z., Fenter P., Bandura A., and Benezeth P.. "Ion Adsorption on Metal Oxide Surfaces to Hydrothermal Conditions.," Meeting of the Electrochemical Society, Washington, DC, 2007.
Zhang, Z., Fenter, P., Sturchio, N.C., Bedzyk, M.J., Machesky, M.L., and Wesolowski, D.J.. "Structure of rutile TiO2 (110) in water and 1 molal Rb+ at pH 12: Inter-relationship among surface charge, interfacial hydration structure, and substrate structural displacements.," Surface Science,, v.60, 2007, p. 1129.
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