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Journal of Nanotechnology
Volume 2013 (2013), Article ID 279090, 4 pages
http://dx.doi.org/10.1155/2013/279090
Research Article

Rheological Behavior of Carbon Nanotubes as an Additive on Lithium Grease

1Production Engineering and Printing Technology Department, Akhbar El Yom Academy, Giza 12211, Egypt
2Mechanical Design and Production Engineering Department, Faculty of Engineering, Cairo University, Giza 12211, Egypt

Received 14 July 2013; Revised 28 July 2013; Accepted 4 August 2013

Academic Editor: Hongmei Luo

Copyright © 2013 Alaa Mohamed et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The rheological behaviors of carbon nanotubes (CNTs) as an additive on lithium grease at different concentrations were examined under various settings of shear rate, shear stress, and apparent viscosity. The results indicated that the optimum content of the CNTs was 2%. These experimental investigations were evaluated with a Brookfield Programmable Rheometer DV-III ULTRA. The results indicated that the shear, stress and apparent viscosity increase with the increase of CNTs concentration. The microstructure of CNTs and lithium grease was examined by high resolution transmission electron microscope (HRTEM) and scanning electron microscope (SEM). The results indicated that the microscopic structure of the lithium grease presents a more regular and homogeneous network structure, with long fibers, which confirms the rheological stability.