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    COLLOQUIUM OF THE LABORATORY FOR COMPUTER DESIGN OF MATERIALS
        Institute for Computational Sciences and Informatics
                  George Mason University, Fairfax campus
	                      (CSI 898-Sec 001) 

           Nanoparticle Synthesis in a High Temperature Process
                          
                            Sheryl H. Ehrman
Department of Chemical Engineering,University of Maryland,College Park

     Currently, there is much interest in so called 'nanoparticles' 
(particles of diameter less than 100 nanometers), because in many cases, 
these particles exhibit physical or chemical properties which differ
significantly from those of the corresponding bulk materials. In single
component systems, we wish to develop models of particle growth and
agglomeration, in order to predicting particle size and morphology.  In
multicomponent systems, we seek to understand what factors influence the
arrangement of chemical species within the particles.  Towards these
goals, experimental results for the formation of single and multicomponent
nanoparticles in flames will be presented.  An improved model of particle
growth, accounting for the effect of particle size on material properties
will be described, and predictions made using the model are compared to
experimental results.  Also, interesting phase separation behavior
observed within the multicompont nanoparticles using transmission 
electron microscopy is compared to that expected for bulk materials. 

	                  Monday , September 13 1999
                                  4:30 pm
                         Room 206, Science & Tech. I

Refreshments will be served.
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Find the schedule at http://www.csi.gmu.edu/lcdm/seminar/schedule.html