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The Scientific World Journal
Volume 2014 (2014), Article ID 504762, 10 pages
Research Article

High Bulk Modulus of Ionic Liquid and Effects on Performance of Hydraulic System

1OLMA d.d., Poljska pot 2, 1000 Ljubljana, Slovenia
2Proionic GmbH, Parkring 18, 8074 Grambach, Austria
3HAWE Hidravlika d.o.o., Petrovce 225, 3301 Petrovce, Slovenia
4University of Maribor, Smetanova 17, 2000 Maribor, Slovenia

Received 30 August 2013; Accepted 8 October 2013; Published 2 January 2014

Academic Editors: K. Endo and J. S. Lee

Copyright © 2014 Milan Kambic et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Over recent years ionic liquids have gained in importance, causing a growing number of scientists and engineers to investigate possible applications for these liquids because of their unique physical and chemical properties. Their outstanding advantages such as nonflammable liquid within a broad liquid range, high thermal, mechanical, and chemical stabilities, low solubility for gases, attractive tribological properties (lubrication), and very low compressibility, and so forth, make them more interesting for applications in mechanical engineering, offering great potential for new innovative processes, and also as a novel hydraulic fluid. This paper focuses on the outstanding compressibility properties of ionic liquid EMIM-EtSO4, a very important physical chemically property when IL is used as a hydraulic fluid. This very low compressibility (respectively, very high Bulk modulus), compared to the classical hydraulic mineral oils or the non-flammable HFDU type of hydraulic fluids, opens up new possibilities regarding its usage within hydraulic systems with increased dynamics, respectively, systems’ dynamic responses.