Dispersive action of octane for cobalt nano-particles

Haining Meng, Fangxia Zhao, Zhenzhong Zhang, Tai Qiu

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

In order to prepare nano-grained WC-Co cemented carbides with high performance, the dispersion of cobalt nano-particles in octane was studied. Three fatty acids, 12-hydroxystearic acid, stearic acid and oleic acid, were used as surfactants to modify the cobalt nano-particles in octane. The adsorption behavior, surface characteristics, suspension stability and rheological behavior were investigated by chemical titration, FT-IR spectroscopy, UV-vis spectroscopy and rheometer, respectively. The results indicated that the cobalt nano-particles modified with 12-hydroxystearic acid achieved the best dispersion performance and suspension stabilization, and 12-hydroxystearic acid also exhibited the highest ability to reduce interparticle van der Waals potential energy. The adsorption of 12-hydroxystearic acid onto the surface of cobalt nano-particles is a chemical and physical process, but the adsorption of stearic acid or oleic acid is only a chemical one.

Original languageEnglish
Pages (from-to)254-259
Number of pages6
JournalInternational Journal of Refractory Metals and Hard Materials
Volume36
DOIs
StatePublished - Jan 2013

Keywords

  • Cobalt nano-particles
  • Dispersion performance
  • Fatty acids
  • Suspension stabilization

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