Nanotech 2013 Vol. 1
Nanotech 2013 Vol. 1
Nanotechnology 2013: Advanced Materials, CNTs, Particles, Films and Composites (Volume 1)

Nanoparticle Synthesis & Applications Chapter 4

Morphological change from nano-cube to nano-sphere by addition of Ni to W in RF thermal plasma synthesis

Authors: Y-M Kim, H. Na, W. Lee, B-J Lee, N-M Hwang, H. Choi

Affilation: Korea Institute of Industrial Technology, Korea

Pages: 320 - 323

Keywords: RF thermal plasma, W and Ni-W nanoparticle synthesis, morphological evolution, Monte Carlo simulation

Abstract:
Pure W and W-Ni nano-particles were effectively synthesized by feeding thermo-physically favorable oxide feedstock micro-powder into argon-hydrogen thermal plasma. During the process, feedstock particle underwent a vaporization, reduction, and condensation pathway. Significant amount of nano-cube is observed for tungsten nano-particle. However, Ni addition had a crucial influence on nano-particle morphology and W-Ni nano-particle became sphere. Morphological evolution was also investigated by a Canonical Ensemble Monte Carlo simulation. The shape evolution of pure W and Ni-W nanopaticles could be explained as a result of surface segregation of added Ni components and the disturbance of surface energy anisotropy due to the Ni-rich layer formed on the W surface.


ISBN: 978-1-4822-0581-7
Pages: 830
Hardcopy: $209.95