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Synthesis and tribological properties of nanogrease

Alaa Mohamed (Egypt Nanotechnology Center, EGNC, Giza, Egypt and Akhbar El Yom Academy, Giza, Egypt)
Mohamed Hamdy (Akhbar El Yom Academy, Giza, Egypt)
Mohamed Bayoumi (Al-Azhar University, Cairo, Egypt)
Tarek Osman (Cairo University, Giza, Egypt)

Industrial Lubrication and Tribology

ISSN: 0036-8792

Article publication date: 9 April 2018

Abstract

Purpose

To enhance the tribological properties of nanogrease, one of the new technologies was used to synthesize a nanogrease having carbon nanotubes (CNTs) nanoparticles (NPs) with different concentrations. The microstructures of the synthesized NPs were characterized and evaluated by x-ray diffraction spectroscopy (XRD) and transmission electron microscopy (TEM). Tribological properties of the nanogrease were evaluated using a four-ball tester. The worn surface of four steel balls was investigated by scanning electron microscopy (SEM) and energy dispersive x-ray spectroscopy (EDX).

Design/methodology/approach

Grease was dissolved in chloroform (10 Wt.%), at 25 °C for 1 h. In parallel, functionalized CNTs with different volume concentrations (0.5, 1, 2 and 3 Wt.%) were dispersed in N, N-dimethylformamide. The mixture was stirred for 15 min and then sonicated (40 kHz, 150 W) for 30 min. After that, the mixture was added to the grease solution and magnetically stirred for 15 min and then sonicated for 2 h.

Findings

The results suggested that CNTs can enhance the antiwear and friction properties of nanogrease at 0.5 Wt.% CNTs to about 57 and 48 per cent, respectively. In addition, the weld load of the base oil containing 0.5 Wt.% CNTs was improved by 17 per cent compared with base grease.

Originality/value

This work describes the inexpensive and simple fabrication of nanogrease for improving the properties of lubricants, which improve power efficiency and extend lifetimes of mechanical equipment.

Keywords

Citation

Mohamed, A., Hamdy, M., Bayoumi, M. and Osman, T. (2018), "Synthesis and tribological properties of nanogrease", Industrial Lubrication and Tribology, Vol. 70 No. 3, pp. 512-518. https://doi.org/10.1108/ILT-08-2017-0228

Publisher

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Emerald Publishing Limited

Copyright © 2018, Emerald Publishing Limited