Charge transport and diffusion of ionic liquids in nanoporous silica membranes

被引：109

作者：

Iacob, Ciprian ^{[1
]}

Sangoro, Joshua Rume ^{[1
]}

Papadopoulos, Periklis ^{[1
]}

Schubert, Tilman ^{[1
]}

Naumov, Sergej ^{[1
]}

Valiullin, Rustem ^{[1
]}

Kaerger, Joerg ^{[1
]}

Kremer, Friedrich ^{[1
]}

机构：

[1] Univ Leipzig, Inst Expt Phys 1, D-04103 Leipzig, Germany

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2010年 / 12卷 / 41期

关键词：

ALUMINA MEMBRANES; SELF-DIFFUSION; MORPHOLOGY; MOLECULES;

D O I：

10.1039/c004546b

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Charge transport in 1-hexyl-3-methylimidazolium hexafluorophosphate ionic liquid in oxidized nanoporous silicon membranes is investigated in a wide frequency and temperature range by a combination of Broadband Dielectric Spectroscopy (BDS) and Pulsed Field Gradient Nuclear Magnetic Resonance (PFG NMR). By applying the Einstein-Smoluchowski relations to the dielectric spectra, diffusion coefficient is obtained in quantitative agreement with independent PFG NMR measurements. More than 10-fold systematic decrease in the effective diffusion coefficient from the bulk value is observed in hydrophilic silica nanopores. A model assuming a reduced mobility at the pore-matrix interface is shown to provide a quantitative explanation for the remarkable decrease of effective transport quantities (such as diffusion coefficient, dc conductivity and consequently, the dielectric loss) of the ionic liquid in non-silanized membranes. This approach is supported by the observation that silanization of porous silica membranes results in a significant increase of the effective diffusion coefficient, which approaches the value for the bulk liquid.

引用

页码：13798 / 13803

页数：6

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