Philip P. Rodenbough
1:00pm - 2:00pm
Room 320 Havemeyer
New York, NY 10027
Abstract: It is well known that ionic semiconductor nanomaterials have optical/electronic properties that change with crystallite size, but it is perhaps less well understood how crystallite size affects the physical/mechanical properties of oxide nanoparticles. This talk will focus on how the lattice parameters of oxides change with crystallite size due to surface stress. We have conducted variable pressure and variable temperature experiments to better understand how the lattice response to these stimuli is related to the size of the crystallite. We find that in ceria and magnesia, bulk modulus has a bimodal change with crystallite size, and thermal experiments with ceria have allowed us to separate out the contributing factors to surface stress at different crystallite sizes. A consideration of how such findings may impact the design of heterogeneous catalysis processes will also be presented.
Tuesday, June 14, 2016 at 1:00pm in Room 320 Havemeyer
Department of Chemistry, Columbia University, Havemeyer Hall, 3000 Broadway, New York, NY 10027, USA | 212-854-2202 | http://chem.columbia.edu/