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Issue 44, 2014
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Solid–ionic liquid interfaces: pore filling revisited

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Abstract

The properties of ionic liquids on ordered and non-ordered mesoporous silicas (silica gel, MCM-41, SBA-15) were studied by nitrogen sorption, mercury intrusion and thermogravimetric analyses, as well as 129Xe-NMR spectroscopy. The ionic liquids investigated are based on the 1-hexyl-3-methylimidazolium cation, which was combined with anions of low (bis(trifluoromethanesulfonyl)imide; [NTf2]), medium (trifluoromethylsulfonate; [CF3SO3]) to high (acetate; [OAc]) basicity. The surface coverage depends on both the type of ionic liquid and support used. This results not only in layer or droplet formation, but also in different physico-chemical properties of the ionic liquid when compared to the bulk, depending mainly on the strength of interaction at the interface. Furthermore, the mercury intrusion analysis of mesopores is shown not to be suitable for supported ionic liquids.

Graphical abstract: Solid–ionic liquid interfaces: pore filling revisited

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Publication details

The article was received on 23 Jun 2014, accepted on 25 Sep 2014 and first published on 30 Sep 2014


Article type: Paper
DOI: 10.1039/C4CP02749C
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Phys. Chem. Chem. Phys., 2014,16, 24359-24372
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    Solid–ionic liquid interfaces: pore filling revisited

    M. T. Heinze, J. C. Zill, J. Matysik, W. D. Einicke, R. Gläser and A. Stark, Phys. Chem. Chem. Phys., 2014, 16, 24359
    DOI: 10.1039/C4CP02749C

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