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Madsen LA, Dingemans TJ, Nakata M, et al. Thermotropic biaxial nematic liquid crystals. Phys Rev Lett. 2004;92(14):145505doi: 10.1103/PhysRevLett.92.145505.
Madsen, L. A., Dingemans, T. J., Nakata, M., & Samulski, E. T. (2004). Thermotropic biaxial nematic liquid crystals. Physical review letters, 92(14), 145505. https://doi.org/10.1103/PhysRevLett.92.145505
Madsen, L A, et al. "Thermotropic biaxial nematic liquid crystals." Physical review letters vol. 92,14 (2004): 145505. doi: https://doi.org/10.1103/PhysRevLett.92.145505
Madsen LA, Dingemans TJ, Nakata M, Samulski ET. Thermotropic biaxial nematic liquid crystals. Phys Rev Lett. 2004 Apr 09;92(14):145505. doi: 10.1103/PhysRevLett.92.145505. Epub 2004 Apr 09. PMID: 15089552.
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Phys Rev Lett. 2004 Apr 09;92(14):145505. doi: 10.1103/PhysRevLett.92.145505. Epub 2004 Apr 09.

Thermotropic biaxial nematic liquid crystals.

Physical review letters

L A Madsen, T J Dingemans, M Nakata, E T Samulski

Affiliations

  1. Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599-3290, USA.

PMID: 15089552 DOI: 10.1103/PhysRevLett.92.145505

Abstract

We have synthesized liquid crystal (LC) mesogens based on a nonlinear oxadiazole unit that exhibit nematic phases near 200 degrees C. Polarized microscopy and conoscopy indicate that these LCs are biaxial nematics. Unambiguous and quantitative evidence for biaxiality is achieved using 2H NMR spectroscopy. "2D powder" spectra, obtained by rotating 2H-labeled samples about an axis perpendicular to the magnetic field at approximately 200 Hz, yield phase biaxiality parameters of approximately 0.1 when coupled with rigorous and proven simulations.

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