HR: 14:45h
AN: GP43B-04 INVITED     [Abstracts]
TI: Synthesis and Characterization of Iron Oxide and Oxyhydroxide Nanoparticles
AU: * Penn, R
EM: penn@chem.umn.edu
AF: Department of Chemistry, University of Minnesota 207 Pleasant St. SE, Minneapolis, MN 55455 United States
AU: Anschutz, A J
EM: anschutz@chem.umn.edu
AF: Department of Chemistry, University of Minnesota 207 Pleasant St. SE, Minneapolis, MN 55455 United States
AU: Erbs, J J
EM: erbs@chem.umn.edu
AF: Department of Chemistry, University of Minnesota 207 Pleasant St. SE, Minneapolis, MN 55455 United States
AU: Gabor, R S
EM: penn@chem.umn.edu
AF: Department of Chemistry, University of Minnesota 207 Pleasant St. SE, Minneapolis, MN 55455 United States
AU: Jentzsch, T L
EM: jentzsch@chem.umn.edu
AF: Department of Chemistry, University of Minnesota 207 Pleasant St. SE, Minneapolis, MN 55455 United States
AU: Gulliver, D M
EM: gull0061@umn.edu
AF: Department of Chemistry, University of Minnesota 207 Pleasant St. SE, Minneapolis, MN 55455 United States
AB: Iron oxides and oxyhydroxide, hereafter referred to as simply iron oxides, often control the chemical speciation of trace metals in soil and sediment systems and can act as sensitive indicators of environmental change. Ferrihydrite is a poorly crystalline iron oxide that typically occurs in the 2-10 nm size range and is initially formed during precipitation of iron in soils and sediments. Ferrihydrite is metastable and serves as a precursor for transformation to more crystalline iron oxide phases such as goethite or hematite. Understanding the fundamental link between particle size and shape and magnetic behavior is key to understanding the paleomagnetic record. In this work, we have developed synthetic procedures for the preparation of model iron oxide particles of controlled size and identical chemistry and of controlled doping (with Al, for example) and identical size. Results highlighting chemical reactivity and magnetic behavior (e.g., superparamagnetism) changes with particle size will be discussed. Finally, an overarching goal is to assemble a common set of procedures and even some materials for use in experiments examining evolving magnetic and chemical character of iron oxide particles. Details regarding ideal synthetic conditions and characterization techniques will be discussed.
DE: 1500 GEOMAGNETISM AND PALEOMAGNETISM
DE: 1599 General or miscellaneous
SC: Geomagnetism and Paleomagnetism [GP]
MN: Fall Meeting 2005