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Issue 11, 2018
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Facile synthesis of core–shell Ag@C nanospheres with improved tribological properties for water-based additives

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Abstract

In this study, silver nanoparticles (NPs) were successfully encapsulated in a carbonaceous shell to form core–shell Ag@C nanospheres using a one-step green hydrothermal method, which involved reduction of AgNO3 and catalyzing the carbonation of aqueous glucose solution. Simultaneously, the Ag core with a diameter of about 130–180 nm and carbon shells with size ranging from 100 to 120 nm were characterized by field-emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM). The surface of Ag@C nanospheres had abundant oxygen-containing functional groups, which were beneficial to their dispersion in water. The tribological behavior of Ag@C nanospheres as a water-based additive was investigated using a MS-T3000 ball-on-disk tribometer. The water sample with 1.0 wt% Ag@C nanospheres exhibited 80.6% and 40.4% reduction in the friction coefficient and wear scar width, respectively, compared to pure water. The improved tribological performance of Ag@C nanospheres was ascribed to their perfectly spherical structure, which acted as a rolling bearing between the friction counterparts. Moreover, the Ag core provided internal support through a three-dimensional contact between the Ag nucleus and carbon shell. Therefore, the Ag@C nanospheres showed significant prospects for water-based lubricants.

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

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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., 2018,42, 8773-8782
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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, 42, 8773
    DOI: 10.1039/C8NJ01382A

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