Influence of Dispersant on the Dispersion Stability of Nano-CoFe₂O₄ Refrigeration Oil

Abstract:

Abstract. Adding dispersants like surfactants and polymers to modify nanoparticles surface is an effective way to enhance the dispersion stability of nanoparticles in refrigeration oil. In this paper, many groups of nano-CoFe₂O₄ refrigeration oil were prepared. In order to obtain the most effective kind of dispersant and the optimum additive amount, sedimentation observation method was employed for evaluation of the dispersion stability of CoFe₂O₄ nanoparticles in 3GS mineral lubricant. The spectral behavior of the surface modified nano-CoFe₂O₄ was studied by Fourier transform infrared (FT-IR) spectrometer. It was revealed that the optimized mass ratio between nano-CoFe₂O₄ and dispersant ratio is 2 to 5; a relatively appropriate dispersant for nano-CoFe₂O₄ would be Tween40, Tween60, Span80, Span80; Tween60 was the best. It was also illustrated in the infrared spectrum that nano-CoFe₂O₄ particles surface modified by Tween60 was connected by organic groups in Tween60. Thus, the particles changed from hydrophilic to lipophilic and performed good dispersity and high stability when dispersed in mineral refrigeration oil.

• Periodical: Advanced Materials Research (Volumes 399-401)
• Pages: 430-438
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.399-401.430
• Online since: November 2011
• Authors: Guan Nan Li, Mei Bo Xing, Rui Xiang Wang
• Keywords: Dispersant, Dispersion Stability, FT-IR, Nano-CoFe₂O₄

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