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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
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Electric-Field-Induced Modulation of Structure and Rheology in MBBA-Based Liquid Crystal Physical Gels.

André Cruz1, Andreja Lesac2, Nataša Šijaković Vujičić2

  • 1Transport Phenomena Research Center (CEFT), Associate Laboratory in Chemical Engineering (ALiCE), Department of Chemical and Biological Engineering, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal.

Gels (Basel, Switzerland)
|June 26, 2026
PubMed
Summary

Researchers developed liquid crystal physical gels (LCPGs) using novel gelators. These LCPGs exhibit enhanced stability and tunable electrorheological properties, paving the way for advanced stimuli-responsive materials.

Keywords:
MBBAelectrorheologyliquid crystal physical geloxalamide gelatorrheology

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Area of Science:

  • Materials Science
  • Soft Matter Physics
  • Supramolecular Chemistry

Background:

  • Liquid crystal physical gels (LCPGs) integrate liquid crystal anisotropy with soft solid stability.
  • MBBA-based LCPGs were synthesized using chiral oxalamide gelators (6-O-Me and 9-O-Me).

Purpose of the Study:

  • To characterize the thermal, rheological, and electrorheological properties of MBBA-based LCPGs.
  • To investigate the influence of electric fields on LCPG microstructure and fiber formation.

Main Methods:

  • Differential scanning calorimetry (DSC)
  • Oscillatory rheology
  • Electrorheological testing
  • Advanced microscopy
  • Custom microfluidic device for in situ electric field application

Main Results:

  • Both LCPGs demonstrated robust gel-like behavior with storage moduli exceeding loss moduli.
  • Gelators delayed crystallization, extending the MBBA stability window by -8 °C (9-O-Me) and -14 °C (6-O-Me).
  • Electric fields weakened the gel network in the nematic phase, promoting thicker, anisotropic fiber formation.

Conclusions:

  • LCPG properties can be effectively tuned via molecular design and external stimuli.
  • These findings highlight the potential of LCPGs for stimuli-responsive soft matter applications.