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Non-corrosive green lubricants: strengthened lignin–[choline][amino acid] ionic liquids interaction via reciprocal hydrogen bonding
State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing University of Technology, Intelligent Composites Laboratory, Department of Chemical and Biomolecular Engineering, The University of Akron.
Shanghai Institute of Applied Physics, Chinese Academy of Sciences.
Intelligent Composites Laboratory, Department of Chemical and Biomolecular Engineering, The University of Akron.
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2015 (English)In: RSC Advances, ISSN 2046-2069, E-ISSN 2046-2069, Vol. 5, no 81, 66067-66072 p.Article in journal (Refereed) Published
Abstract [en]

A series of novel green lubricants with dissolved lignin in [choline][amino acid] ([CH][AA]) ionic liquids (ILs) have been synthesized in this work. The effect of lignin on the thermal and tribological properties of the lignin/[CH][AA] lubricants was systematically investigated by means of thermogravimetric analysis, differential scanning calorimetry, and a friction and wear tester. The lignin in [CH][AA] has been demonstrated to be an effective additive to improve thermal stability, reduce the wear rates and stabilize the friction coefficients of lignin/[CH][AA] lubricants. Density function theory calculations on the electronic structure of [CH][AA] ILs reveal the atomic natural charge of ILs and their hydrogen bonding capability with lignin. Moreover, these green lubricants show excellent anti-corrosive properties against commercial aluminum and iron boards. The strong physical adsorption of [CH][AA] ILs onto the steel surface and the reciprocal hydrogen bonding between [CH][AA] ILs and lignin synergistically contribute to the enhanced lubrication film strength and thus the tribological properties of these new lubricants. This work provides a new perspective on utilizing complete bio-products in advanced tribological lubrication systems. In addition, this will open a new application venue for lignin to improve product value in lignocellulosic biomass utilization.

Place, publisher, year, edition, pages
2015. Vol. 5, no 81, 66067-66072 p.
Research subject
Machine Elements
URN: urn:nbn:se:ltu:diva-239DOI: 10.1039/C5RA11093ALocal ID: 00f63425-c11a-43b1-98e5-e03e7674f814OAI: diva2:972351

Validerad; 2015; Nivå 2; 20150821 (andbra)

Available from: 2016-09-20 Created: 2016-09-20 Last updated: 2016-09-21Bibliographically approved

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