| Anomalous electrical conductivity behavior at elevated pressure in the protic ionic liquid procainamide hydrochloride. | |
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MedLine Citation:
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PMID: 22304270 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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Using broadband dielectric spectroscopy, we investigated the effect of hydrostatic pressure on the conductivity relaxation time τ_{σ} of the supercooled protic ionic liquid, procainamide hydrochloride, a common pharmaceutical. The pressure dependence of τ_{σ} exhibited anomalous behavior in the vicinity of the glass transition T_{g}, manifested by abrupt changes in activation volume. This peculiar behavior, paralleling the change in temperature dependence of τ_{σ} near T_{g}, is a manifestation of the decoupling between electrical conductivity and structural relaxation. Although the latter effectively ceases in the glassy state, free ions retain their mobility but with a reduced sensitivity to thermodynamic changes. This is the first observation of decoupling of ion migration from structural relaxation in a glassy conductor by isothermal densification. |
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Authors:
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Z Wojnarowska; C M Roland; A Swiety-Pospiech; K Grzybowska; M Paluch |
Publication Detail:
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Type: Journal Article Date: 2012-01-05 |
Journal Detail:
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Title: Physical review letters Volume: 108 ISSN: 1079-7114 ISO Abbreviation: Phys. Rev. Lett. Publication Date: 2012 Jan |
Date Detail:
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Created Date: 2012-02-06 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0401141 Medline TA: Phys Rev Lett Country: United States |
Other Details:
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Languages: eng Pagination: 015701 Citation Subset: IM |
Affiliation:
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Institute of Physics, Silesian University, ul. Uniwersytecka 4, 40-007 Katowice, Poland. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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