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Rheological performance of magnetorheological grease with embedded graphite additives

The use of highly viscous grease as a medium in magnetorheological grease (MRG) provides the benefit of avoiding sedimentation from occurring. However, it limits the expansion of yield stress in the on-state condition, thus reducing the application performance during operation. Therefore, in this st...

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Main Authors:	Mohd. Nasir, N. A., Nazmi, N., Mohamad, N., Ubaidillah, U., Nordin, N. A., Mazlan, S. A., Abdul Aziz, S. A.
Format:	Article
Language:	English
Published:	MDPI 2021
Subjects:	T Technology (General)
Online Access:	http://eprints.utm.my/id/eprint/95567/1/NurAlyaaMohdNasir2021_RheologicalPerformanceofMagnetorheological.pdf http://eprints.utm.my/id/eprint/95567/ http://dx.doi.org/10.3390/ma14175091
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spelling	my.utm.955672022-05-31T12:46:33Z http://eprints.utm.my/id/eprint/95567/ Rheological performance of magnetorheological grease with embedded graphite additives Mohd. Nasir, N. A. Nazmi, N. Mohamad, N. Ubaidillah, U. Nordin, N. A. Mazlan, S. A. Abdul Aziz, S. A. T Technology (General) The use of highly viscous grease as a medium in magnetorheological grease (MRG) provides the benefit of avoiding sedimentation from occurring. However, it limits the expansion of yield stress in the on-state condition, thus reducing the application performance during operation. Therefore, in this study, the improvement in the rheological properties of MRG was investigated through the introduction of graphite as an additive. MRG with 10 wt % graphite (GMRG) was fabricated, and its properties were compared to a reference MRG sample. The microstructure of GMRG was characterized using an environmental scanning electron microscope (ESEM). The rheological properties of both samples, including apparent viscosity, yield stress, and viscoelasticity, were examined using a shear rheometer in rotational and oscillatory modes. The results demonstrated a slight increase in the apparent viscosity in GMRG and a significant improvement in yield stress by 38.8% at 3 A with growth about 32.7% higher compared to MRG from 0 to 3 A. An expansion of the linear viscoelastic region (LVE) from 0.01% to 0.1% was observed for the GMRG, credited to the domination of the elastic properties on the sample. These obtained results were confirmed based on ESEM, which described the contribution of graphite to constructing a more stable chain structure in the GMRG. In conclusion, the findings highlight the influence of the addition of graphite on improving the rheological properties of MRG. Hence, the addition of graphite in MRG shows the potential to be applied in many applications in the near future. MDPI 2021 Article PeerReviewed application/pdf en http://eprints.utm.my/id/eprint/95567/1/NurAlyaaMohdNasir2021_RheologicalPerformanceofMagnetorheological.pdf Mohd. Nasir, N. A. and Nazmi, N. and Mohamad, N. and Ubaidillah, U. and Nordin, N. A. and Mazlan, S. A. and Abdul Aziz, S. A. (2021) Rheological performance of magnetorheological grease with embedded graphite additives. Materials, 14 (17). ISSN 1996-1944 http://dx.doi.org/10.3390/ma14175091 DOI: 10.3390/ma14175091
institution	Universiti Teknologi Malaysia
building	UTM Library
collection	Institutional Repository
continent	Asia
country	Malaysia
content_provider	Universiti Teknologi Malaysia
content_source	UTM Institutional Repository
url_provider	http://eprints.utm.my/
language	English
topic	T Technology (General)
spellingShingle	T Technology (General) Mohd. Nasir, N. A. Nazmi, N. Mohamad, N. Ubaidillah, U. Nordin, N. A. Mazlan, S. A. Abdul Aziz, S. A. Rheological performance of magnetorheological grease with embedded graphite additives
description	The use of highly viscous grease as a medium in magnetorheological grease (MRG) provides the benefit of avoiding sedimentation from occurring. However, it limits the expansion of yield stress in the on-state condition, thus reducing the application performance during operation. Therefore, in this study, the improvement in the rheological properties of MRG was investigated through the introduction of graphite as an additive. MRG with 10 wt % graphite (GMRG) was fabricated, and its properties were compared to a reference MRG sample. The microstructure of GMRG was characterized using an environmental scanning electron microscope (ESEM). The rheological properties of both samples, including apparent viscosity, yield stress, and viscoelasticity, were examined using a shear rheometer in rotational and oscillatory modes. The results demonstrated a slight increase in the apparent viscosity in GMRG and a significant improvement in yield stress by 38.8% at 3 A with growth about 32.7% higher compared to MRG from 0 to 3 A. An expansion of the linear viscoelastic region (LVE) from 0.01% to 0.1% was observed for the GMRG, credited to the domination of the elastic properties on the sample. These obtained results were confirmed based on ESEM, which described the contribution of graphite to constructing a more stable chain structure in the GMRG. In conclusion, the findings highlight the influence of the addition of graphite on improving the rheological properties of MRG. Hence, the addition of graphite in MRG shows the potential to be applied in many applications in the near future.
format	Article
author	Mohd. Nasir, N. A. Nazmi, N. Mohamad, N. Ubaidillah, U. Nordin, N. A. Mazlan, S. A. Abdul Aziz, S. A.
author_facet	Mohd. Nasir, N. A. Nazmi, N. Mohamad, N. Ubaidillah, U. Nordin, N. A. Mazlan, S. A. Abdul Aziz, S. A.
author_sort	Mohd. Nasir, N. A.
title	Rheological performance of magnetorheological grease with embedded graphite additives
title_short	Rheological performance of magnetorheological grease with embedded graphite additives
title_full	Rheological performance of magnetorheological grease with embedded graphite additives
title_fullStr	Rheological performance of magnetorheological grease with embedded graphite additives
title_full_unstemmed	Rheological performance of magnetorheological grease with embedded graphite additives
title_sort	rheological performance of magnetorheological grease with embedded graphite additives
publisher	MDPI
publishDate	2021
url	http://eprints.utm.my/id/eprint/95567/1/NurAlyaaMohdNasir2021_RheologicalPerformanceofMagnetorheological.pdf http://eprints.utm.my/id/eprint/95567/ http://dx.doi.org/10.3390/ma14175091
_version_	1735386820143742976
score	13.211869

Rheological performance of magnetorheological grease with embedded graphite additives

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