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Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals
Published on: May 29, 2018
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Intrinsically Visible Light-Responsive Liquid Crystalline Physical Gels Driven by a Halogen Bond
Xun Tong1, Xiaoyu Zhao1, Yuan Qiu1
1Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
Langmuir : the ACS Journal of Surfaces and Colloids
|September 23, 2020
Summary
Researchers developed a novel visible light-responsive liquid crystal (LC) physical gel using halogen bonds. This eco-friendly material offers controllable transitions for advanced soft material applications.
Area of Science:
- Materials Science
- Supramolecular Chemistry
- Soft Matter Physics
Background:
- Photoresponsive physical gels utilizing liquid crystals (LCs) are of significant interest for various applications.
- Current research predominantly focuses on UV light, posing environmental concerns.
- Halogen bonding offers a promising approach for constructing supramolecular gels due to its unique properties.
Purpose of the Study:
- To create a liquid crystal (LC) physical gel responsive to visible light by combining halogen bonding with photoresponsive molecules.
- To investigate the self-assembly behavior and photoresponsive properties of the developed binary gelator system in an LC solvent.
Main Methods:
- Synthesis of azopyridine-containing Azopy-C10 as a halogen bond acceptor.
- Selection of 1,2-bis(2,3,5,6-tetrafluoro-4-iodophenyl)diazene as a halogen bond donor and visible light-responsive component.
- Self-assembly of the binary gelator in a nematic LC solvent (5CB) to form a physical gel.
Main Results:
- Formation of a stable LC physical gel through self-assembly of the binary gelator in 5CB.
- Demonstration of a gel-to-sol transition upon green light irradiation.
- Observation that increased gelator concentration leads to higher saturation voltage and decreased switch-off time.
Conclusions:
- The developed system successfully integrates halogen bonding and visible light responsiveness in an LC physical gel.
- This controllable, photoresponsive LC physical gel presents new possibilities for manipulating smart soft materials.
- The findings pave the way for more environmentally friendly and precisely tunable soft material technologies.
