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

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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.

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Journal: TechConnect Briefs
Volume: 1, Nanotechnology 2013: Advanced Materials, CNTs, Particles, Films and Composites (Volume 1)
Published: May 12, 2013
Pages: 320 - 323
Industry sector: Advanced Materials & Manufacturing
Topic: Nanoparticle Synthesis & Applications
ISBN: 978-1-4822-0581-7