Synergistic behavior of graphene and ionic liquid as bio-based lubricant additive

Hasnul, Muhammad Harith and Mohd Zulkifli, Nurin Wahidah and Masjuki, H. H. and Zulkifli, Syahir Amzar and Mohd Yusoff, Mohd Nur Ashraf and Zakaria, Muhammad Zulfattah (2021) Synergistic behavior of graphene and ionic liquid as bio-based lubricant additive. Lubricants, 9 (5). pp. 1-15. ISSN 2075-4442

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Abstract

Abstract: The constant utilization of petroleum-based products has prompted concerns about the environment, hence a replacement for these products must be explored. Biolubricants are a suitable replacement for petroleum-based lubricants as they provide better lubricity. Biolubricant performance can be improved by the addition of graphene. However, there are reports that graphene is unable to form a stable suspension for a long period. This study used a graphene-ionic liquid additive combination to stabilize the dispersion in a biolubricant. Graphene and ionic liquid were dispersed into the biolubricant via a magnetic stirrer. The samples were tested using a high frequency reciprocating rig. The cast iron sample was then further observed using various techniques to determine the lubricating mechanism of the lubricant. Different dispersion stability of graphene was observed for different biolubricants, which can be improved with ionic liquids. All ionic liquid samples maintained an absorbance value of three for one month. The utilization of ionic liquid was also able to decrease the frictional performance by 33%. Further study showed that by using the ionic liquid alone, the frictional could only reduce the friction coefficient by 13% and graphene could only reduce the friction by 7%. A smooth worn surface scar can be seen on the graphene-IL sample compared to the prominent corrosive spot on the IL samples and abrasive scars on graphene samples. This indicates synergistic behavior between the two additives. It was found that the ionic liquid does not only improve the dispersion stability, but also plays a role in forming the tribolayer.

Item Type:	Article (Journal)
Additional Information:	9092/93275
Uncontrolled Keywords:	biolubricant; graphene; ionic liquid; friction and wear
Subjects:	T Technology > TP Chemical technology > TP155 Chemical engineering T Technology > TP Chemical technology > TP315 Fuel
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Engineering > Department of Mechanical Engineering Kulliyyah of Engineering
Depositing User:	Professor Masjuki Hassan
Date Deposited:	25 Oct 2021 09:11
Last Modified:	25 Oct 2021 09:11
URI:	http://irep.iium.edu.my/id/eprint/93275

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