Colossal dielectric permittivity and superparaelectricity in phenyl pyrimidine based liquid crystals
Citation:
Yuri P. Panarin, Wanhe Jiang, Neelam Yadav, Mudit Sahai,ad Yumin Tang,e Xiangbing Zeng, O. E. Panarina, Georg H. Mehl and Jagdish K. Vij, Colossal dielectric permittivity and superparaelectricity in phenyl pyrimidine based liquid crystals, Journal of Materials Chemistry C, 13, 2025, 1507 - 1518Download Item:
Abstract:
A set of polar rod-shaped liquid crystalline molecules with dipole moments (m 4 10.4–14.8 D), and
molecular structures based on the ferroelectric nematic prototype DIO, are designed, synthesized, and
investigated. When the penultimate fluoro-phenyl ring is replaced with a phenylpyrimidine moiety, the
molecular dipole moment increases from 9.4 D for DIO to 10.4 D for the new molecule, and when the
terminal fluoro-group is additionally replaced by the nitrile group, the dipole moment rises to 14.8 D.
Such a replacement enhances not only the net dipole moment of the molecule, but also reduces the
steric hindrance to rotations of the moieties within the molecule. The superparaelectric nematic (N) and
smectic A (SmA) phases of these compounds are found to exhibit colossal dielectric permittivity,
obtained both from dielectric spectroscopy, and capacitance measurements using a simple capacitor
divider circuit. The electric polarization is measured vs. the field (E). However, almost no hysteresis in
P vs. E is observed in the nematic and smectic A phases. The colossal dielectric permittivity persists over
the entire fluidic range. The experimental results lead us to conclude that these materials belong to the
class of superparaelectrics (SPE) rather than to ferroelectrics, due to the absence of hysteresis and
the linear dependence of P on E. The synthesized organic materials are the first fluids for which
superparaelectricity is discovered and furthermore they show great potential for applications in
supercapacitors used for storing energy.
Sponsor
Grant Number
Science Foundation Ireland (SFI)
21/US/3788
Author's Homepage:
http://people.tcd.ie/jvijDescription:
PUBLISHED
Author: Vij, Jagdish
Sponsor:
Science Foundation Ireland (SFI)Type of material:
Journal ArticleSeries/Report no:
Journal of Materials Chemistry C13
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Full text availableSubject (TCD):
Nanoscience & MaterialsDOI:
https://doi.org/10.1039/D4TC03561EISSN:
2050-7526Metadata
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