Odd–even effects in the director dynamics of the nematic phases formed by symmetric and non-symmetric liquid crystal dimers. An ESR investigation

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DOI 10.1039/A902484K
Impact Factor 3.676
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Abstract

Liquid crystal dimers, in which two mesogenic groups are linked by a flexible spacer, have been found to exhibit a pronounced odd–even effect in many of their physical properties. These include the nematic–isotropic transition temperatures, transitional entropies and their orientational order. In contrast, there have been far fewer studies of the director dynamics within the nematic phases of liquid crystal dimers. Here we present results from investigations of the magnetic field-induced relaxation time for the director in the nematic phase, using ESR spectroscopy, for the non-symmetric α-(4′-cyanobiphenyl-4-yloxy)-ω-(4-alkylanilinebenzylidene-4′-oxy)alkane dimers and the symmetric α,ω-bis(4-alkylanilinebenzylidene-4′-oxy)alkane dimers. Unlike quantities such as the orientational order parameter it is not so apparent as to what temperature scale should be used to compare the relaxation time, which depends on the rotational viscosity coefficient γ1. We discuss various possibilities and show that for a certain choice the relaxation times do exhibit an odd–even effect as well as a dependence on the nature of the smectic phase following the nematic.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
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Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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