Camphoric acid based ferroelectric hydrogen bonded liquid crystalline materials integration further dielectric relaxations and novel applications

•A novel dielectric method is proposed to observe the unwinding of helicoidal structure.•Negative and positive temperature coefficient of thermistor is identified in liquid crystals.•Dielectric relaxation studies in smectic C* and smectic X* phases are studied. A sequence of hydrogen bond ferroelect...

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Bibliographic Details
Published in:Journal of molecular structure 2021-05, Vol.1232, p.130022, Article 130022
Main Authors: Mohan, M L N Madhu, Pal, Kaushik
Format: Article
Language:English
Subjects:
Activation energy
Dielectric relaxations
Hydrogen bond
Thermos-resistance
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Summary:•A novel dielectric method is proposed to observe the unwinding of helicoidal structure.•Negative and positive temperature coefficient of thermistor is identified in liquid crystals.•Dielectric relaxation studies in smectic C* and smectic X* phases are studied. A sequence of hydrogen bond ferroelectric liquid crystals (HBFLC), derived from Camphoric acid and alkyloxy benzoic acids display a variety of mosogenic polymorphism with various smectic ordering like C*, X* and G*. FTIR spectra and dielectric relaxations in smectic C* and smectic X* are studied. A new method to elucidate the helicoidal structure variation with temperature through dielectric investigations is discussed. Thermistor which exhibits both positive and negative temperature coefficients is derived from the present liquid crystals and results are also discussed. [Display omitted]
ISSN:0022-2860
1872-8014
DOI:10.1016/j.molstruc.2021.130022