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   COLLOQUIUM OF THE LABORATORY FOR COMPUTER DESIGN OF MATERIALS
                   School of Computational Sciences
                           (CSI 898-Sec 001)
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                 Transmission Electron Microscopy 
               Studies of Amorphous Fe-oxides in Soils

                          Mark Krekeler
Environmnental Science and Policy Department, George Mason University, Fairfax, VA 22030


Amorphous iron oxides are natural nanoparticles found in soils that play a
major role in sequestering pollutants.  These materials are commonly studied
 "in bulk" and details about variation in the morphology, chemical
composition and crystallinity of individual particles are lacking.
Transmission electron microscopy techniques provide great insight into these
materials.  Investigations of natural amorphous iron oxides from soils
associated with wetlands in the Great Lakes Region indicate that distinct
textures occur with a wide range in chemical composition.  Chemical mapping
with a nanometer probe using scanning transmission electron microscopy
investigations indicates that chemical elements are distributed
heterogeneously.  Textures and variation in spatial distribution of elements
similar to those found in natural soils were produced in synthetic soils.
Provisional patents for this technology have been filed through George
Mason's Office of Technology Transfer.

                             September 19, 4:30 pm
               Room 206, Science & Tech. I, Fairfax Campus

Refreshments will be served at 4:15 PM.
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Find the schedule at http://www.scs.gmu.edu/lcdm/seminar/schedule.html
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