Journal Article

PUBDB-2022-03558

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Side Chain Length-Dependent Dynamics and Conductivity in Self-Assembled Ion Channels

Kolmangadi, M. ; Smales, G. J. ; ZhuoQing, L. ; Yildirim, A. ; Wuckert, E. ; Eutionnat, S. ; Demel, F. ; Huber, P.Extern*DESY* ; Laschat, S. ; Schönhals, A. (Corresponding author)

2022
Soc. Washington, DC

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Please use a persistent id in citations: doi:10.1021/acs.jpcc.2c03023

Abstract: We 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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Contributing Institute(s):

1. CIMMS-RA Center for integr. Multiscale M (CIMMS)
2. Technische Universität Hamburg-Harburg (TUHH)

Research Program(s):

1. 631 - Matter – Dynamics, Mechanisms and Control (POF4-631) (POF4-631)

Experiment(s):

1. No specific instrument

Appears in the scientific report 2022

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Database coverage:
; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Essential Science Indicators ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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