Surprisingly high, bulk liquid-like mobility of silica-confined ionic liquids

文献情報

出版日 2009-03-17

DOI 10.1039/B821833A

インパクトファクター 3.676

著者

Ronald Göbel, Peter Hesemann, Jens Weber, Eléonore Möller, Alwin Friedrich, Sabine Beuermann

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要旨

Mesoporous silica monoliths were prepared by the sol–gel technique and filled with 1-ethyl-3-methyl imidazolium [Emim]-X (X = dicyanamide [N(CN)2], ethyl sulfate [EtSO4], thiocyanate [SCN], and triflate [TfO]) ionic liquids (ILs) using a methanol-IL exchange technique. The structure and behavior of the ILs inside the silica monoliths were studied using X-ray scattering, nitrogen sorption, IR spectroscopy, solid-state NMR, and thermal analysis. DSC finds shifts in both the glass transition temperature and melting points (where applicable) of the ILs. Glass transition and melting occur well below room temperature. There is thus no conflict with the NMR and IR data, which show that the ILs are as mobile at room temperature as the bulk (not confined) ILs. The very narrow line widths of the NMR spectra suggest that the ILs in our materials have the highest mobility reported for confined ILs so far. As a result, our data suggest that it is possible to generate IL/silica hybrid materials (ionogels) with bulk-like properties of the IL. This could be interesting for applications in, e.g., the solar cell or membrane fields.

掲載誌

Physical Chemistry Chemical Physics

CiteScore: 5.5

自己引用率: 10.3%

年間論文数: 3036

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