Biaxial Nematic Liquid Crystals

A non‐liquid crystal compound (4‐POXD‐6) containing the 1,3,4‐oxadiazole group and pyridyl (py) group was synthesized. And a series of supramolecular mesogenic complexes were obtained by mixing 4‐POXD‐6 and 4‐alkoxybenzoic acids (Cn, n=6, 8, 12). The liquid crystalline properties of 4‐POXD‐6/Cn (n=6, 8, 12) were investigated by means of differential scanning calorimetry, polarized optical microscopy, and wide‐angle X‐ray diffraction. It was found that 4‐POXD‐6/Cn (6, 8) display monotropic nematic and smectic A phases, while 4‐POXD‐6/C12 exhibits a SmX phase in the heating process and a SmA phase in the cooling run. Variable‐temperature FTIR spectroscopic studies revealed hydrogen bonds existed in both crystalline and liquid crystalline phases.

show abstract

Expulsion of disclinations in nematic liquid crystals

Biscari¹,

Sluckin²

2003

Eur. J. Appl. Math

View full text Add to dashboard Cite

We study the interactions between a nematic liquid crystal disclination and the surface of the half-space which bounds it. When strong anchoring conditions are applied on the boundary, we show how the biaxial core of the disclination affects the repulsive force that tends to drive the disclination away from the surface. If we replace the strong boundary conditions with an anchoring potential, the surface-disclination interaction depends on the surface extrapolation length. In particular, we show that the nematic may expel the disclination if the anchoring strength is below a critical value.

show abstract

Biaxial Nematic Liquid Crystals

Cited by 3 publications

References 48 publications

Design of Biaxial Nematic Mesogens

Design of Biaxial Nematic Mesogens

Liquid Crystalline Behaviours of the Complexes Based on 1,3,4‐Oxadiazole Derivative and Benzoic Acid

Expulsion of disclinations in nematic liquid crystals

Contact Info

Product

Resources

About