Open AccessSurface crystallization of ionic liquid crystals
Author(s) -
Mónia A. R. Martins,
Pedro J. Carvalho,
Douglas Alves,
Cláudio Dariva,
Mariana C. Costa,
Rute A. S. Ferreira,
Paulo André,
Pedro Morgado,
Simão P. Pinho,
Eduardo J. M. Filipe,
João A. P. Coutinho
Publication year - 2019
Publication title -
physical chemistry chemical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.053
H-Index - 239
eISSN - 1463-9084
pISSN - 1463-9076
DOI - 10.1039/c9cp03947c
Subject(s) - crystallization , ionic liquid , materials science , chemical engineering , crystallography , surface (topology) , chemistry , nanotechnology , organic chemistry , catalysis , geometry , mathematics , engineering
The evidence for surface crystallization in ionic liquids is scarce. The existing reports seem to be contradictory as for its driving forces, since in the two compounds investigated in the literature, the contribution of coloumbic and van der Waals forces is very different. In this work 1-dodecyl-3-methylimidazolium tetrafluoroborate was studied and its surface crystallization characterized by surface tension, ellipsometry and optical microscopy. The results obtained seem to reconcile previous observations, and it was further shown, using the same techniques, that this phenomenon is prevalent in other ionic liquids. MD simulation results illustrate the different possibilities of organization, providing reasonable models to rationalize the experimental observations.
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