DE-FG03-01ER15237 Annual Progress Report 2003

Navrotsky, Alexandra

Alexandra Navrotsky, University of California at Davis (United States)

关键词: Sample Preparation;    Mgo;    Progress Report;    Thin Films;    Hydration Energetics;   

DOI  :  10.2172/811573
RP-ID  :  2003
RP-ID  :  FG03-01ER15237
RP-ID  :  811573

美国|英语

来源: UNT Digital Library

【 摘 要 】

OAK B262 Annual report. We have investigated the thermodynamics of several nanoscale systems: Iron oxides: We have completed and published heat capacity and entropy data on goethite, lepidocrocite, and maghemite, as well as measured their heats of formation. We also have enthalpy of formation data for several poorly crystalline nanophase oxides (schwertmannite, ferrihydrite, and epsilon-Fe{sub 2}O{sub 3}). The next step is to measure thermodynamic properties as a function of surface area for several oxides. CoO-MgO: Thermochemical data for bulk samples are in press. Heat capacities have been measured for CoO, MgO, and some intermediate samples. Nanosized samples at several compositions are being prepared this summer. Thin films have been prepared and some solution calorimetry done, but additional sample preparation and characterization is needed. Hydration energetics: Our setups for gas adsorption calorimetry and water immersion calorimetry are being completed. We will test them with known materials (Al{sub 2}O{sub 3}, selected zeolites) and then proceed to work on TiO{sub 2}, Fe{sub 2}O{sub 3}, and zeolites.