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Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets
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Switchable Dielectric Phase Transition Triggered by Pendulum-Like Motion in an Ionic Co-crystal.
Qing Wang1, Wan-Ying Zhang1, Ping-Ping Shi1
1Ordered Matter Science Research Center, Jiangsu Key Laboratory for Science and Applications of Molecular Ferroelectrics, Southeast University, Nanjing, 211189, China.
Chemistry, an Asian Journal
|August 3, 2018
Summary
Researchers developed a novel pendulum-like dynamic strategy for molecular ionic co-crystals, enabling thermal ON/OFF switching for advanced dielectric materials and molecular memory devices.
Area of Science:
- Materials Science
- Solid-State Chemistry
- Crystallography
Background:
- Molecular-based ionic co-crystals offer low-cost fabrication and tunable properties for electronic devices.
- Achieving reliable dipole-based ON/OFF switching in these materials remains a significant challenge.
Purpose of the Study:
- To introduce a novel dynamic strategy for inducing order-disorder transitions in ionic co-crystals.
- To investigate the potential of a specific co-crystal, [C5H7N3Cl]3[Sb2Br9] (compound 1), as an intelligent dielectric material.
Main Methods:
- Utilized temperature-dependent dielectric and differential scanning calorimetry (DSC) analyses.
- Investigated the role of cation and anion dynamics in phase transitions.
- Characterized the molecular motion and dipole reorientation within the co-crystal structure.
Main Results:
- Compound 1 exhibits a reversible phase transition driven by the order-disorder transition of its cations.
- The cation's pendulum-like motion acts as the source of the dielectric switch.
- Demonstrated thermal ON/OFF switchable behavior in the bulk crystal.
Conclusions:
- The pendulum-like dynamic strategy provides a feasible method for modulating dipole motion in electrically polarizable materials.
- Compound 1 shows promise as an artificial intelligent dielectric material for applications in molecular memory and beyond.
- This approach offers new insights into controlling dipole reorientation in crystalline materials.
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