Macroscopic behavior of ferrocholesteric liquid crystals and ferrocholesteric gels and elastomers

Area of Science:

• Soft Matter Physics
• Materials Science
• Chirality Studies

Background:

• Superparamagnetic liquid crystals and gels exhibit complex macroscopic properties.
• Understanding the interplay between macroscopic chirality and dynamic behavior is crucial.

Purpose of the Study:

• To derive macroscopic dynamic equations for ferrocholesteric liquid crystals and gels.
• To investigate the influence of macroscopic chirality on material properties under magnetic fields.

Main Methods:

• Developed dynamic equations using the director field as the primary variable.
• Treated magnetization as a dynamic degree of freedom, examining its coupling to other variables.
• Incorporated magnetic field-dependent terms to reveal cross-coupling phenomena.

Main Results:

• Identified a unique static property: a generalized energy term linear in electric field and quadratic in magnetic field.
• Demonstrated that magnetic fields induce reversible electric, heat, and concentration currents in ferrocholesterics, dependent on chirality sign.
• Showcased that extensional flow in magnetic fields generates electric and heat currents in ferrocholesteric systems.

Conclusions:

• Macroscopic chirality significantly dictates the dynamic and static properties of superparamagnetic liquid crystals and gels.
• The study reveals novel cross-coupling effects and current generation mechanisms in chiral magnetic materials.
• Findings offer insights into designing advanced materials with tunable electronic and thermal transport properties.