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Facile synthesis of core-shell Ag@C nanospheres with improved tribological properties for water-based additives

Abstract

In this study, the silver nanoparticles (NPs) were successful encapsulated in carbonaceous shell to form the perfectly core-shell Ag@C nanospheres by a one-step green hydrothermal method from reducing AgNO3 and catalyzing carbonation of aqueous glucose solution. Simultaneously, the Ag core with the diameter of about 130-180 nm and the thickness of carbon shell with the size range from 100 to 120 nm was characterized by field-emission scanning electron microscopy (FESEM) and transmission electron microscope (TEM). The surface of Ag@C nanospheres has abundant oxygen-containing functional groups which are beneficial to dispersity in water. The tribological behavior of Ag@C nanospheres as water-based additive was investigated employing a MS-T3000 ball-on-disk tribometer. Consequently, the water with 1.0 wt% Ag@C nanospheres exhibits 80.6% and 40.4% reduction in the friction coefficient and the wear scar width compared to pure water, respectively. The better tribological performance of Ag@C nanospheres was ascribed to the perfectly spherical structure which act as rolling bearing between the friction counterparts. Moreover, the Ag core plays the role of internal support by the three-dimensional contact between the Ag nucleus and the carbon shell. Therefore, the Ag@C nanospheres show significant prospects for water-based lubricant.

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Publication details

The article was received on 21 Mar 2018, accepted on 08 Apr 2018 and first published on 10 Apr 2018


Article type: Paper
DOI: 10.1039/C8NJ01382A
Citation: New J. Chem., 2018, Accepted Manuscript
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    Facile synthesis of core-shell Ag@C nanospheres with improved tribological properties for water-based additives

    H. Song, J. Huang, X. Jia and W. Sheng, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ01382A

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