Surface behavior of low-temperature molten salt mixtures during the transition from liquid to solid

Journal article


Publication Details

Author(s): Bhuin RG, Schreiber P, Heller B, Scheuermeyer M, Wasserscheid P, Steinrück HP, Maier F
Journal: Journal of Molecular Liquids
Publication year: 2019
Volume: 275
Pages range: 290-296
ISSN: 0167-7322


Abstract

We report on surface investigations of cesium and tetraphenylphosphonium bis(trifluoromethylsulfonyl)imide (Cs[Tf2N], [PPh4][Tf2N]) molten salts and their mixtures. Depending on composition, these ionic compounds combine low melting points with exceptionally high thermal stability, and thus, exhibit considerably enlarged thermal operation windows compared to conventional ionic liquids. To elucidate their liquid-solid transition behavior in the near-surface region, temperature-dependent angle-resolved X-ray photoelectron spectroscopy (ARXPS) investigations were performed using our unique laboratory electron spectrometer DASSA ("Dual Analyzer System for Surface Analysis"), dedicated for investigations of macroscopic liquid samples. We followed temperature-induced changes in bulk and surface composition within the first nanometers of the neat salt melts and of Cs[Tf2N]: (PPh4][Tf2N]= 3 : 1 and 1 : 3 mixtures. In the mixtures, pronounced surface enrichment of Cs+ on expense of the bulky [PPne ions was found in the liquid state at temperatures close to the liquid-solid transition. In the solid state of Cs[Tf2N]-rich mixtures, [PPH4](+) completely vanishes from the near-surface region probed by XPS. (C) 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license.


FAU Authors / FAU Editors

Bhuin, Radha Gobinda
Lehrstuhl für Physikalische Chemie II
Heller, Bettina
Lehrstuhl für Physikalische Chemie II
Maier, Florian Dr.
Lehrstuhl für Physikalische Chemie II
Scheuermeyer, Marlene
Lehrstuhl für Chemische Reaktionstechnik
Schreiber, Patrick
Lehrstuhl für Physikalische Chemie II
Steinrück, Hans-Peter Prof. Dr.
Lehrstuhl für Physikalische Chemie II
Wasserscheid, Peter Prof. Dr.
Lehrstuhl für Chemische Reaktionstechnik


How to cite

APA:
Bhuin, R.G., Schreiber, P., Heller, B., Scheuermeyer, M., Wasserscheid, P., Steinrück, H.-P., & Maier, F. (2019). Surface behavior of low-temperature molten salt mixtures during the transition from liquid to solid. Journal of Molecular Liquids, 275, 290-296. https://dx.doi.org/10.1016/j.molliq.2018.11.056

MLA:
Bhuin, Radha Gobinda, et al. "Surface behavior of low-temperature molten salt mixtures during the transition from liquid to solid." Journal of Molecular Liquids 275 (2019): 290-296.

BibTeX: 

Last updated on 2019-01-03 at 01:08