Viscous state effect on the activity of Fe nanocatalysts.

Journal Article, Research Support, Non-U.S. Gov't, Research Support, U.S. Gov't, Non-P.H.S.

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.

Full Text

Duke Authors

Cited Authors

  • Cervantes-Sodi, F; McNicholas, TP; Simmons, JG; Liu, J; Csányi, G; Ferrari, AC; Curtarolo, S

Published Date

  • November 23, 2010

Published In

Volume / Issue

  • 4 / 11

Start / End Page

  • 6950 - 6956

PubMed ID

  • 20964288

Electronic International Standard Serial Number (EISSN)

  • 1936-086X

Digital Object Identifier (DOI)

  • 10.1021/nn101883s

Language

  • eng

Citation Source

  • PubMed