Viscous state effect on the activity of Fe nanocatalysts.
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Many applications of nanotubes and nanowires require controlled bottom-up engineering of these nanostructures. In catalytic chemical vapor deposition, the thermo-kinetic state of the nanocatalysts near the melting point is one of the factors ruling the morphology of the grown structures. We present theoretical and experimental evidence of a viscous state for nanoparticles near their melting point. The state exists over a temperature range scaling inversely with the catalyst size, resulting in enhanced self-diffusion and fluidity across the solid-liquid transformation. The overall effect of this phenomenon on the growth of nanotubes is that, for a given temperature, smaller nanoparticles have a larger reaction rate than larger catalysts.
Published Version (Please cite this version)10.1021/nn101883s
Publication InfoCervantes-Sodi, F; Csányi, G; Curtarolo, S; Ferrari, AC; Liu, J; McNicholas, Thomas P; & Simmons, JG (2010). Viscous state effect on the activity of Fe nanocatalysts. ACS Nano, 4(11). pp. 6950-6956. 10.1021/nn101883s. Retrieved from http://hdl.handle.net/10161/4101.
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Professor in the Department of Mechanical Engineering and Materials Science
RESEARCH FIELDS Nanoscale Science of Energy Computational materials science Nanotube growth characterization Alloy theory Superlubricity on quasicrystals Superconductivity in Metal borides Genetic Approaches to QM Predictions of Materials Structures Materials for Nuclear Detection The research is multidisciplinary and makes use of state of the art techniques from fields like materials science, chemis