Several types of bilayer smectic liquid crystals with ferroelectric and antiferroelectric properties in binary mixture of dimeric compounds

Article Abstract:

The mesomorphic behavior and phase structure are examined in the mixture of two kinds of dimeric compounds, [alpha][omega]-bis(4-alkoxyanilinebenzylidene-4'-carbonyloxy)pentane (mOAM5AMOm), by optical microscopy, X-ray diffraction, polarization switching and second-harmonic generation measurements. The new appearances of these bilayer phases is discussed as a mixing effect of long and short tail groups and also in relation to the structural characteristics of a twin dimer molecule.

Analysis, X-rays, X-ray diffraction, Optical properties, Ferroelectric crystals, Dimer acids

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Low-birefringent, chiral banana phase below calamitic nematic and/or smectic C phases in oxadiazole derivatives

Article Abstract:

Banana-shaped molecules based on the oxadiazole core whose bend angle is slightly larger than that of the conventional P-n-O-PIMB are synthesized and their mesomorphic properties are investigated by taking notice of the banana phase. The oxadiazole derivatives have displayed a liquid-crystal polymorphism showing both the calamitic and banana Bx phases, where the Bx phase has a twisted grain boundary (TGB)-like helical structure as is observed in the B4 phase.

Science & research, Research, Electric properties, Chirality, X-ray analysis, Phenyl compounds

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Chirality transfer between weakly birefringent and electric-field-induced highly birefringent B2 phases in a bent-core mesogen

Article Abstract:

The electric-field-induced transition observed for the weakly birefringent chiral B2 phase possessing the twisted grain boundary (TGB)-like helical structure which is formed from the banana molecule based on the naphthalene bent core is reported.

Usage, Electric fields, Helicases

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