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Solid-state 13C NMR study of cholesteric liquid crystals.

Kazuhiko Yamada1, Kazuhiro Marumo, Sungmin Kang

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Summary

We studied cholesteric liquid crystals (6OCB) under a strong magnetic field. Doping with CR above a critical helical twisting power (HTP) prevented magnetic field alignment, preserving the cholesteric structure.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Cholesteric liquid crystals (CLCs) exhibit unique structural properties influenced by molecular interactions and external fields.
  • 4-(hexyloxy)-4'-cyanobiphenyl (6OCB) is a common CLC system whose behavior under magnetic fields is of interest.
  • Doping CLCs with chiral agents can modify their helical structure and response to external stimuli.

Purpose of the Study:

  • To investigate the structural response of 6OCB cholesteric liquid crystals to a high magnetic field (11.7 T).
  • To determine the critical helical twisting power (HTP) at which CLCs resist magnetic field-induced realignment.
  • To understand the interplay between molecular ordering, doping concentration, and magnetic field effects in CLCs.

Main Methods:

  • Solid-state (13)C nuclear magnetic resonance (NMR) spectroscopy was employed to analyze structural changes.
  • Five different concentrations of 6OCB doped with 4-methoxyphenyl 3,4-O-isopropylidene-2,6-bis-O-(4-methylbenzoyl)-β-d-galactopyranoside (CR) were prepared.
  • NMR spectral analyses and simulations, considering phase biaxiality, were used to interpret director alignment.

Main Results:

  • Pure 6OCB and CLCs doped with low CR concentrations (≤1.00 mol %) aligned with the magnetic field.
  • CLCs doped with higher CR concentrations (≥2.34 mol %) maintained their cholesteric structures against the magnetic field.
  • A critical HTP of approximately 1.27 μm(-1) was identified as the threshold for resisting magnetic field realignment.
  • Non-uniform order parameters and perturbation of molecular directors by the external field were observed.

Conclusions:

  • The helical twisting power (HTP) of dopants is crucial in determining the magnetic field response of cholesteric liquid crystals.
  • A critical HTP value exists, above which the inherent cholesteric structure resists alignment by strong magnetic fields.
  • These findings provide insights into the fundamental behavior of CLCs and have implications for their application in magnetic field-responsive devices.