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Radiom, Milad
Publications (2 of 2) Show all publications
Radiom, M. (2019). Ionic liquid–solid interface and applications in lubrication and energy storage. Current Opinion in Colloid & Interface Science, 39, 148-161
Open this publication in new window or tab >>Ionic liquid–solid interface and applications in lubrication and energy storage
2019 (English)In: Current Opinion in Colloid & Interface Science, ISSN 1359-0294, E-ISSN 1879-0399, Vol. 39, p. 148-161Article in journal (Refereed) Published
Abstract [en]

Room-temperature ionic liquids (ILs) exhibit many attractive properties in proximity to solid surfaces. Primarily, they form well-defined interfacial layers that are tunable — electrically and thermally — as well as being stable — mechanically, electrically, and thermally — over a wide range. Recent investigations have aimed at understanding the molecular structuring of ILs at their interface with solids and in confinement, while in tandem, ILs are used as next-generation lubricants and energy storage materials. The result is a large volume of work that has appeared over the last decade. In this review, the recent literature is presented and future research directions are discussed.

Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
Capacitance, Confinement, Energy storage, Friction, Liquid–solid interfaces, Lubrication, Room-temperature ionic liquids, Surface forces
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-248209 (URN)10.1016/j.cocis.2019.01.013 (DOI)000469152200014 ()2-s2.0-85062285271 (Scopus ID)
Note

QC 20190412

Available from: 2019-04-12 Created: 2019-04-12 Last updated: 2019-10-24Bibliographically approved
Radiom, M., Pedraz, P., Pilkington, G., Rohlmann, P., Glavatskih, S. & Rutland, M. W. (2018). Anomalous Interfacial Structuring of a Non-Halogenated Ionic Liquid: Effect of Substrate and Temperature. Colloids and Interfaces, 2(4), Article ID 60.
Open this publication in new window or tab >>Anomalous Interfacial Structuring of a Non-Halogenated Ionic Liquid: Effect of Substrate and Temperature
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2018 (English)In: Colloids and Interfaces, ISSN 2504-5377, Vol. 2, no 4, article id 60Article in journal (Refereed) Published
Abstract [en]

We investigate the interfacial properties of the non-halogenated ionic liquid (IL), trihexyl(tetradecyl)phosphonium bis(mandelato)borate, [P6,6,6,14][BMB], in proximity to solid surfaces, by means of surface force measurement. The system consists of sharp atomic force microscopy (AFM) tips interacting with solid surfaces of mica, silica, and gold. We find that the force response has a monotonic form, from which a characteristic steric decay length can be extracted. The decay length is comparable with the size of the ions, suggesting that a layer is formed on the surface, but that it is diffuse. The long alkyl chains of the cation, the large size of the anion, as well as crowding of the cations at the surface of negatively charged mica, are all factors which are likely to oppose the interfacial stratification which has, hitherto, been considered a characteristic of ionic liquids. The variation in the decay length also reveals differences in the layer composition at different surfaces, which can be related to their surface charge. This, in turn, allows the conclusion that silica has a low surface charge in this aprotic ionic liquid. Furthermore, the effect of temperature has been investigated. Elevating the temperature to 40 °C causes negligible changes in the interaction. At 80 °C and 120 °C, we observe a layering artefact which precludes further analysis, and we present the underlying instrumental origin of this rather universal artefact.

Place, publisher, year, edition, pages
MDPI, 2018
Keywords
non-halogenated ionic liquids, interfacial layers, atomic force microscopy, surface forces, surface charge, surface interactions, thermal instability
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-248994 (URN)10.3390/colloids2040060 (DOI)
Note

QC 20190619

Available from: 2019-04-10 Created: 2019-04-10 Last updated: 2019-06-19Bibliographically approved
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