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

Purpose The target 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 were 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). Design/methodology/approach First GNPs was mixed well with lithium grease using mechanical stirring at 3500 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 were mixed and dispersed well in the lithium grease using sonication path for 30 min and mechanical stirring at 3500 rpm for 15 min at 28 °C, to form a homogenous nanocomposite. Findings The results indicated that 1...

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