Balancing Compatibility and Gelability for High-Performance Cholesteric Liquid Crystalline Physical Gels

Area of Science:

• Materials Science
• Supramolecular Chemistry

Background:

• Liquid crystalline physical gels (LCPGs) are of interest for their mechanical and stimulus-response properties.
• Developing high-performance LCPGs is challenging due to gelator limitations like thermal stability and compatibility.

Purpose of the Study:

• To design and synthesize novel gelators for high-performance LCPGs.
• To investigate the role of ethylene glycol groups in gelator compatibility and LCPG properties.

Main Methods:

• Synthesis of four novel gelators based on 1,4-benzenedicarboxamide phenylalanine derivatives.
• Formation and characterization of LCPGs in the liquid crystal P0616A.
• Mechanical property testing (storage modulus) and optical property analysis (Cotton effect).

Main Results:

• Ethylene glycol groups significantly improve gelator-liquid crystal compatibility.
• All synthesized gelators formed stable LCPGs in P0616A.
• One LCPG exhibited a storage modulus >10^6 Pa, comparable to SmC gels.
• Gels showed a strong Cotton effect and induced cholesteric fingerprint structures.

Conclusions:

• Novel low molecular weight gelators offer a strategy for high-performance LCPG construction.
• These gelators enhance mechanical properties and enable cholesteric structures in LCPGs.
• The developed LCPGs are promising for advanced liquid crystal device applications.