Characterization of Adsorption Complexes at Water/Solid     Interfaces
{'Code': '06030107', 'Directorate': {'Abbreviation': 'GEO', 'LongName': 'Directorate For Geosciences'}, 'Division': {'Abbreviation': 'EAR', 'LongName': 'Division Of Earth Sciences'}}
{'SignBlockName': 'David Lambert', 'PO_EMAI': 'dlambert@nsf.gov', 'PO_PHON': '7032924736'}
The partitioning of ions at water/solid oxide and water/clay                    interfaces is poorly understood at the molecular level, yet                     detailed structural information about surface complexes is                      essential for quantitative description of many interfacial                      processes.  These processes play fundamental roles in many fields,              including geochemistry, oceanography, and environmental                         engineering.  The proposed work will utilize high-intensity,                    wavelength-tunable synchrotran radiation and X-ray Absorption                   Spectroscopy (XAS), specifically Extended X-Ray Absorption Fine                 Structure (EXAFS) and X-ray Absorption Near Edge Structure                      (XANES), to obtain direct, in-situ measurements of nearest-                     neighbor, and where possible, next-neighbor distances and                       identities, coordination numbers, and in favorable systems,                     distances between adsorbate ions and cations in the solid surface.              This information will be used to assist in the definition of                    composition and structure of surface complexes and to distinguish               among adsorption, absorption, precipitation, and coprecipitation.               Ten systems will be studied: involving Pb2+, Sr2+, CO2+, Cu2+,                  SeO4/2-, and SeO3/2- as adsorbates, and geothite, gamma-Al2O3,                  rutile, and kaolinite as adsorbents.  The proposed study will                   provide detailed compositional and structural information about                 adsorption complexes, and an opportunity to compare results                     obtained by several methods.  It will also provide an opportunity               to test and refine current theoretical models for adsorption                    processes.
[{'FirstName': 'George', 'LastName': 'Parks', 'PI_MID_INIT': 'A', 'PI_SUFX_NAME': 'Jr.', 'PI_FULL_NAME': 'George A Parks', 'EmailAddress': None, 'NSF_ID': '000459398', 'StartDate': '06/01/1988', 'EndDate': None, 'RoleCode': 'Co-Principal Investigator'}, {'FirstName': 'Gordon', 'LastName': 'Brown', 'PI_MID_INIT': 'E', 'PI_SUFX_NAME': 'Jr.', 'PI_FULL_NAME': 'Gordon E Brown', 'EmailAddress': 'gordon.brown@stanford.edu', 'NSF_ID': '000354509', 'StartDate': '06/01/1988', 'EndDate': None, 'RoleCode': 'Principal Investigator'}]
{'Name': 'Stanford University', 'CityName': 'STANFORD', 'ZipCode': '943052004', 'PhoneNumber': '6507232300', 'StreetAddress': '450 JANE STANFORD WAY', 'StreetAddress2': None, 'CountryName': 'United States', 'StateName': 'California', 'StateCode': 'CA', 'CONGRESSDISTRICT': '16', 'CONGRESS_DISTRICT_ORG': 'CA16', 'ORG_UEI_NUM': 'HJD6G4D6TJY5', 'ORG_LGL_BUS_NAME': 'THE LELAND STANFORD JUNIOR UNIVERSITY', 'ORG_PRNT_UEI_NUM': None}
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[{'Code': '1571', 'Text': 'SCEC'}, {'Code': '1573', 'Text': 'Petrology and Geochemistry'}]
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