Gradient measurement technique to identify phase transitions in nano-dispersed liquid crystalline compounds. (1st September 2016)

• Record Type: Journal Article
• Authors: Pardhasaradhi, P.; Madhav, B.T.P.; Rao, M. Venugopala; Manepalli, R.K.N.R.; Pisipati, V.G.K.M.
• Is Part Of: Phase transitions. Volume 89:Number 9(2016)
• Page Start: 902
• Page End: 909
• Publication Date: 2016-09-01
• Subjects: differential scanning calorimeter (DSC) -- gradient measurement (GMS) -- gradient magnitude similarity deviation (GMSD) -- MATLAB -- nano-dispersion -- polarizing microscope (POM); Phase transformations (Statistical physics) -- Periodicals; 530.47405
• DOI: 10.1080/01411594.2015.1091074
• Languages: English
• ISSNs: 0141-1594

Abstract

Abstract : Characterization and phase transitions in pure and 0.5% BaTiO3 nano-dispersed liquid crystalline (LC) N -(p-n-heptyloxybenzylidene)-p-n-nonyloxy aniline, 7O.O9, com-pounds are carried out using a polarizing microscope attached with hot stage and camera. We observed that when any of these images are distorted, different local structures suffer from various degradations in a gradient magnitude. So, we examined the pixel-wise gradient magnitude similarity between the reference and distorted images combined with a novel pooling strategy – the standard deviation of the GMS map – to determine the overall phase transition variations. In this regard, MATLAB software is used for gradient measurement technique to identify the phase transitions and transition temperature of the pure and nano-dispersed LC compounds. The image analysis of this method proposed is in good agreement with the standard methods like polarizing microscope (POM) and differential scanning calorimeter (DSC). 0.5% BaTiO3 nano-dispersed 7O.O9 compound induces cholesteric phase quenching the nematic phase, which the pure compound exhibits.