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A Rheological Investigation of Carbon Nanotube Grease
Haiping Hong1, Hammad Younes2, Greg Christensen1
1Department of Material and Metallurgical Engineering, South Dakota School of Mines and Technology, Rapid City, SD 57701, United States.
Journal of Nanoscience and Nanotechnology
|February 16, 2019
Summary
Carbon nanotubes (CNTs) create a stable 3D network in grease, enhancing its structure and thermal properties. This CNT-grease exhibits viscoelasticity, indicating potential for superior lubrication and thermal conductivity.
Area of Science:
- Materials Science
- Rheology
- Nanotechnology
Background:
- Carbon nanotubes (CNTs) possess exceptionally high thermal conductivity.
- Polyalphaolefin oils are commonly used as base oils in greases.
- Investigating CNTs as thickening agents in greases is a novel approach.
Purpose of the Study:
- To explore the potential of CNTs as thickening agents in polyalphaolefin oils to form CNT-grease.
- To evaluate the rheological properties of CNT-grease for lubrication and structural insights.
- To understand the structure and particle-particle interactions within CNT suspensions at high concentrations.
Main Methods:
- Macroscopic rheological investigation of CNT-grease.
- Analysis of viscoelastic response and creep recovery.
- Characterization of CNT suspensions at approximately 10.0 wt%.
Main Results:
- CNT-grease exhibits a stable three-dimensional (3D) network structure.
- Viscoelastic response and creep recovery provide evidence of network formation.
- The elastic response suggests significant energy is required to initiate viscous flow.
Conclusions:
- The stable 3D network in CNT-grease is supported by rheological data.
- Rheological investigation offers insights into CNT suspension structure and particle interactions.
- Understanding CNT suspension structure can enable manipulation for improved thermal properties.
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