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Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets
Published on: May 15, 2017
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Phase Behavior and Dynamics of Binary and Multicomponent Thioester Liquid Crystal Mixtures.
Arkadiusz Rudzki1, Sławomir Zalewski1, Beata Suchodolska1
1Faculty of Sciences, Siedlce University of Natural Sciences and Humanities , 3-go Maja 54, 08-110 Siedlce, Poland.
The Journal of Physical Chemistry. B
|December 21, 2016
Summary
This study investigates two new ferroelectric liquid crystal mixtures, revealing complex dynamics and distinct switching times. The findings offer insights into chiral liquid crystal behavior and potential applications.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Physical Chemistry
Background:
- Ferroelectric liquid crystals (FLCs) exhibit unique electro-optical properties.
- Understanding the phase behavior and dynamics of FLC mixtures is crucial for device applications.
- New FLC mixtures require comprehensive characterization to explore their potential.
Purpose of the Study:
- To synthesize and characterize two novel ferroelectric liquid crystal mixtures.
- To investigate the phase sequences, thermal properties, and electro-optical behavior of these mixtures.
- To analyze the dielectric relaxation dynamics and identify relaxation processes in different phases.
Main Methods:
- Differential scanning calorimetry (DSC)
- Transmitted light intensity measurements
- Polarized optical microscopy
- Electro-optical method
- Dielectric relaxation spectroscopy
Main Results:
- Two mixtures, MHOBS4 + MHOBS7 (binary) and 610712 + MHOBS8 (multicomponent), were studied.
- Both mixtures exhibit enantiotropic phase sequences including ferroelectric SmC* phases.
- The multicomponent mixture shows a wider SmC* phase range and significantly slower switching times (500–3500 μs) compared to the binary mixture (50–90 μs).
- Dielectric relaxation spectroscopy revealed complex dynamics and observed relaxation processes in crystalline, SmC*, SmI*, and SmG* phases down to 12 °C.
- Low-intensity Goldstone and noncancellation modes were detected in specific phases.
Conclusions:
- The characterized ferroelectric liquid crystal mixtures exhibit distinct phase behaviors and dielectric dynamics.
- The MHOBS4 + MHOBS7 and 610712 + MHOBS8 mixtures present unique properties suitable for further research in electro-optics.
- Detailed analysis of dielectric spectra provides valuable information on molecular dynamics within different liquid crystal phases.
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