Topology-dependent self-structure mediation and efficient energy conversion in heat-flux-driven rotors of cholesteric droplets

When heat flux is applied to a chiral liquid crystal, unidirectional rotation is induced around the flux axis, as first discovered by Otto Lehmann in 1900. In recent years, this heat-flux-induced phenomenon has been studied mostly in droplets of cholesteric liquid crystals undergoing phase transitio...

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Published in:Nature communications 2018-01, Vol.9 (1), p.432-11, Article 432
Main Authors: Yoshioka, Jun, Araoka, Fumito
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Language:English
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639/301
639/301/923/919
639/766/189
Cholesteric liquid crystals
Coexistence
Crystals
Dispersion
Droplets
Energy conversion
Energy Transfer
Fluctuations
Heat
Heat flux
Hot Temperature
Humanities and Social Sciences
Liquid crystals
Liquid Crystals - chemistry
multidisciplinary
Phase transitions
Rotating liquids
Rotation
Rotors
Science
Science (multidisciplinary)
Topology
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description When heat flux is applied to a chiral liquid crystal, unidirectional rotation is induced around the flux axis, as first discovered by Otto Lehmann in 1900. In recent years, this heat-flux-induced phenomenon has been studied mostly in droplets of cholesteric liquid crystals undergoing phase transition from the isotropic to cholesteric phase, i.e., in the coexistence region, which occurs over a very narrow temperature range. Here, we report that the heat-flux-induced rotation can be stabilised by the use of a dispersion system, in which the cholesteric droplets are dispersed in a viscous and poorly miscible isotropic solvent. Interestingly, the phenomenon is found to be topology dependent. Moreover, the rotation is not only stable but also more efficient than that in the known systems. We describe in detail how the dynamics of the heat-flux-induced rotation are altered in the present dispersion system. The Lehmann effect describes the spontaneous rotation of cholesteric liquid crystals in response to heat input. Here, the authors stabilise it by dispersing cholesteric droplets into a poorly miscible solvent and show dependences of rotation speed and conversion efficiency on the topological states.
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subjects 639/301
639/301/923/919
639/766/189
Cholesteric liquid crystals
Coexistence
Crystals
Dispersion
Droplets
Energy conversion
Energy Transfer
Fluctuations
Heat
Heat flux
Hot Temperature
Humanities and Social Sciences
Liquid crystals
Liquid Crystals - chemistry
multidisciplinary
Phase transitions
Rotating liquids
Rotation
Rotors
Science
Science (multidisciplinary)
Topology
title Topology-dependent self-structure mediation and efficient energy conversion in heat-flux-driven rotors of cholesteric droplets
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