To read the full version of this content please select one of the options below:

Rheological behavior of lithium grease with CNTs/GNPs hybrid nanocomposite as an additive

Mohamed Ashour (Akhbar El Yom Academy, Giza, Egypt)
Alaa Mohamed (Egypt Nanotechnology Center, Giza, Egypt)
Abou Bakr Elshalakany (Akhbar El Yom Academy, Giza, Egypt)
Tarek Osman (Cairo University, Giza, Egypt)
Aly Khatab (Cairo University, Giza, Egypt)

Industrial Lubrication and Tribology

ISSN: 0036-8792

Article publication date: 12 March 2018



The purpose of this paper is to investigate the rheological characteristics of graphene nanoplatelets (GNPs) and hybridized nanocomposite consisting of multi-walled carbon nanotubes (MWCNTs) and GNPs as an additive on lithium-based grease. The experiments of nanogrease are examined in different values of shear stress, apparent viscosity, temperature and shear rate using Brookfield Programmable Rheometer DV-III ULTRA and characterized by high-resolution transmission electron microscope (HRTEM) and X-ray diffraction (XRD).


First, GNPs was mixed well with lithium grease using mechanical stirring at 3,500 rpm for 15 min at room temperature to form a homogenous composite at different concentrations (0.5, 1, 1.5, 2 and 2.5 Wt.%). Afterwards, MWCNTs and GNPs are mixed and dispersed well in the lithium grease using a sonication path for 30 min and mechanical stirring at 3,500 rpm for 15 min at 28°C to form a homogenous nanocomposite.


The results indicated that 1 Wt.% of GNPs is the optimum concentration. Subsequently, the weight percentage of additives varying between MWCNTs and GNPs are tested, and the result indicate that the grease containing GNPs had a 75 per cent increase in shear stress and 93.7 per cent increase in apparent viscosity over ordinary grease.


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



Ashour, M., Mohamed, A., Elshalakany, A.B., Osman, T. and Khatab, A. (2018), "Rheological behavior of lithium grease with CNTs/GNPs hybrid nanocomposite as an additive", Industrial Lubrication and Tribology, Vol. 70 No. 2, pp. 331-338.



Emerald Publishing Limited

Copyright © 2018, Emerald Publishing Limited