Synthesis, Characterization, and Mechanical Behavior of Nanoporous Metal Foams

Seminar series
Physical Chemistry Seminar
Mon, Jan 27 4:00pm
2033 Young Hall
Speaker Professor Andrea M. Hodge
University of Southern California
Dept. of Aerospace and Mechanical Engineering

Abstract: Nanoporous Au, Cu, Ag, and Pd foams (65-80% porous) were synthesized by dealloying processes.  The pore and ligament size, ranging from 20 to 900 nm, can be controlled by either the dealloying process or the selection of electrolytes.  A comprehensive study of nanoporous foams will be presented in order to elucidate on the relationship between mechanical properties, relative density and foam ligament size at the nanoscale.  Scaling equations for yield strength and Young’s Modulus were investigated using 20% to 42% relative density foams.  Overall, this study demonstrates that, at the nanoscale, the foam strength is no longer governed by the relative density, but rather by the size of the ligaments; while the elastic modulus seems to be independent of the ligament size. In addition, applications of nanoporous foams for Surface-enhanced Raman-scattering (SERS) spectroscopy and as catalysts for low temperature oxidation of carbon monoxide will be discussed.