Journal article
(Original article)


Halide-Free Synthesis and Tribological Performance of Oil-Miscible Ammonium and Phosphonium-Based Ionic Liquids


Publication Details
Author(s): Westerholt A, Weschta M, Bösmann A, Tremmel S, Korth Y, Wolf MJ, Schlücker E, Wehrum N, Lennert A, Uerdingen M, Holweger W, Wartzack S, Wasserscheid P
Publisher: American Chemical Society
Publication year: 2015
Volume: 3
Journal issue: 5
Pages range: 797–808
ISSN: 2168-0485
Language: English

Abstract

Due to their low vapor pressures, nonflammability, high thermal stabilities, and excellent tribological properties ionic liquids (ILs) are highly attractive lubricant base oils and additives. However, for practical applications of ILs in lubrication, two requirements are often limiting, the required miscibility with standard mineral oils (≥5 wt %) and the complete absence of corrosive halide ions in the ionic liquid. Moreover, the need for full compatibility with standard oil additives reduces the number of potential IL-based lubricant additives even further. In this contribution, an economic halide-free synthesis route to oil-miscible ionic liquids is presented, and very promising tribological properties of such ILs as base oil or additive are demonstrated. Therefore, sliding tests on bearing steel and XPS analysis of the formed surface films are shown. Corrosion test results of different bearing metals in contact with our halide-free ILs and (salt) water prove their applicability as real life lubricants. In the sustainable chemistry and engineering context, we present a halide-free design approach for ionic performance chemicals that may contribute to significant energy savings due to their enhanced lubrication properties.



Focus Area of Individual Faculties


How to cite
APA: Westerholt, A., Weschta, M., Bösmann, A., Tremmel, S., Korth, Y., Wolf, M.J.,... Wasserscheid, P. (2015). Halide-Free Synthesis and Tribological Performance of Oil-Miscible Ammonium and Phosphonium-Based Ionic Liquids. ACS Sustainable Chemistry & Engineering, 3(5), 797–808. https://dx.doi.org/10.1021/sc500517n

MLA: Westerholt, Antje, et al. "Halide-Free Synthesis and Tribological Performance of Oil-Miscible Ammonium and Phosphonium-Based Ionic Liquids." ACS Sustainable Chemistry & Engineering 3.5 (2015): 797–808.

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