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000480192 1001_ $$aKolmangadi, Mohamed$$b0
000480192 245__ $$aSide Chain Length-Dependent Dynamics and Conductivity in Self-Assembled Ion Channels
000480192 260__ $$aWashington, DC$$bSoc.$$c2022
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000480192 520__ $$aWe study the molecular mobility and electrical conductivity of a homologous series of linear shaped columnar ionic liquid crystals ILCn, (n = 8, 10, 12, 14, 16) using broadband dielectric spectroscopy (BDS), specific heat spectroscopy (SHS), and X-ray scattering. We aim to understand how the alkyl chain length influences the dynamics and electric conductivity in this system. Two dielectrically active relaxation modes are observed, the $γ$ and the $α_{core}$ process, that correspond to the localized fluctuations of the alkyl chains and cooperative motions of the aromatic core in the columns, respectively. Both the $γ$ relaxation and the $α_{core}$ process slow down with increasing alkyl chain length. SHS reveals one relaxation process, the $α_{alkyl}$ process that has a similar temperature dependence as that of the $α_{core}$ process for ILC12, 14, and 16 but shifts to higher temperature for ILC8 and 10. For ILC12, 14, and 16, the absolute values of DC conductivity increase by 4 orders of magnitude at the transition from the plastic crystalline to hexagonal columnar phase. For ILC8 and 10, the DC conductivity behavior is similar to ionic liquids, where the conductivity is coupled with structural relaxation. Small-angle X-ray investigations reveal that both the intercolumnar distance and the disorder coherence length increase with alkyl chain length; conversely, the DC conductivity decreases monotonically.
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000480192 7001_ $$00000-0002-8654-9867$$aSmales, Glen J.$$b1
000480192 7001_ $$aZhuoQing, Li$$b2
000480192 7001_ $$aYildirim, Arda$$b3
000480192 7001_ $$aWuckert, Eugen$$b4
000480192 7001_ $$aEutionnat, Sandy$$b5
000480192 7001_ $$aDemel, Felix$$b6
000480192 7001_ $$0P:(DE-H253)PIP1013897$$aHuber, Patrick$$b7
000480192 7001_ $$00000-0002-1488-3903$$aLaschat, Sabine$$b8
000480192 7001_ $$00000-0003-4330-9107$$aSchönhals, Andreas$$b9$$eCorresponding author
000480192 773__ $$0PERI:(DE-600)2256522-X$$a10.1021/acs.jpcc.2c03023$$gp. acs.jpcc.2c03023$$n27$$p10995 - 11006$$tThe journal of physical chemistry <Washington, DC> / C$$v126$$x1932-7447$$y2022
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