Gradient measurement technique to identify phase transitions in nano-dispersed liquid crystalline compounds

Characterization and phase transitions in pure and 0.5% BaTiO 3 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...

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Bibliographic Details
Published in:Phase transitions 2016-09, Vol.89 (9), p.902-909
Main Authors: Pardhasaradhi, P., Madhav, B.T.P., Rao, M. Venugopala, Manepalli, R.K.N.R., Pisipati, V.G.K.M.
Format: Article
Language:English
Subjects:
Crystals
differential scanning calorimeter (DSC)
Differential scanning calorimetry
Distortion
gradient magnitude similarity deviation (GMSD)
gradient measurement (GMS)
Liquid crystals
MATLAB
Measurement techniques
Microscopes
nano-dispersion
Nanostructure
Phase transformations
Phase transitions
Polarization
polarizing microscope (POM)
Transition temperatures
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Summary:Characterization and phase transitions in pure and 0.5% BaTiO 3 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% BaTiO 3 nano-dispersed 7O.O9 compound induces cholesteric phase quenching the nematic phase, which the pure compound exhibits.
ISSN:0141-1594
1029-0338
DOI:10.1080/01411594.2015.1091074