Influence of pressure on the B₂I phase transition of a banana-shaped liquid crystal

Abstract

Employing a phenomenological mean field theory, we analyse the effect of high pressure on the B 2 I phase transition properties of a bent-core liquid crystal. The basic idea of the work is to explain the phase transition behaviour of system by assuming that certain Landau coefficients associated with the order parameters coupling terms of the free-energy density expansion are pressure dependent. We observe excellent agreement between the theoretical and experimental results of mesogen PHDBB and that the B 2 I transition remains first order even at the elevated pressures.

Liquid Crystal Biosensors: Principles, Structure and Applications

“…Liquid crystals (LCs) are phase transition materials that exist between the liquid and the crystal states, and they can flow as liquids and also have properties such as birefringence of crystals [ 1 ]. LCs can respond readily to external stimuli such as electromagnetic fields [ 2 , 3 , 4 , 5 , 6 ], pressure [ 7 , 8 , 9 ], surface effects [ 10 , 11 , 12 , 13 ], optical properties [ 14 , 15 ], temperature [ 16 , 17 , 18 ], and chemical analytes [ 19 , 20 ]. Changes in these factors can be monitored by various characterization techniques.…”