NANO.IL.

Effect of Electric Field on the Tribological Performance of Surfactant Coated CuS Nanoparticle Lubricant Additives

Ofir Friedman Department of Materials Engineering and Ilse Katz Institute for Nanoscale Science and Technology, Ben-Gurion University of the Negev, Beer-Sheva, Israel

Nanomaterials have great potential as lubricating materials and for the development of advanced lubrication technologies. Surfactant coated CuS nanoparticle additives1 dispersed in diethyl succinate lubricant were studied in friction experiments under applied electric potential from -30 V to +30 V. A remarkable decrease in the coefficient of friction was observed upon application of an electric field perpendicular to the shearing interface. Friction tests indicate that the nanoparticles can reduce the friction coefficient of diethyl succinate (DES) lubricant by ~25%, from 0.24 to 0.18. When a negative potential lower than -14 V was applied, the friction coefficient markedly decreased to 0.05. According to this research, shape controlled nanoscale lubricant additives are likely to have profound technological importance in reducing and controlling friction in engineering systems.

Rabkin A., Friedman O. & Golan Y. Surface plasmon resonance in surfactant coated copper sulfide nanoparticles: Role of the structure of the capping agent. J. Colloid. Interf. Sci. 457, 43-51 (2015).









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