TY - JOUR
T1 - Crystallization kinetics in liquid crystals with hexagonal precursor phases by calorimetry
AU - Padmaja, Sunkara
AU - Ajita, Narayanan
AU - Srinivasulu, Maddasani
AU - Girish, Sriram Ramchandra
AU - Pisipati, Venkata Gopala Krishna Murthy
AU - Potukuchi, Dakshina Murthy
PY - 2010
Y1 - 2010
N2 - Design and characterization of Schiff based liquid crystalline nO.m compounds exhibiting hexagonal smectic phases are reported. Crystallization kinetics investigations are carried out in the liquid crystals (LCs) exhibiting hexagonal ordered orthogonal and tilted precursor LC phases by calorimetry. The Avrami theory is referred and results are analyzed. Influence of molecular ordering, structure, and dimensionality of the LC precursor phase on kinetics is studied. Effect of shape and flexibility of the molecule for nucleation and growth processes is investigated. Varying rate of kinetics reflects upon the transit of the system from constant type to independent type of nucleation. The trends in the Avrami parameter b and exponent n suggest sporadic nucleation. Crystal growth is interpreted as heterogeneous permeation of layered domains (or aggregates) formed by needle shaped calamitic molecules. Calorimetric observations at different crystallization temperatures CT and hold time t infer diffusion mediated crystallization.
AB - Design and characterization of Schiff based liquid crystalline nO.m compounds exhibiting hexagonal smectic phases are reported. Crystallization kinetics investigations are carried out in the liquid crystals (LCs) exhibiting hexagonal ordered orthogonal and tilted precursor LC phases by calorimetry. The Avrami theory is referred and results are analyzed. Influence of molecular ordering, structure, and dimensionality of the LC precursor phase on kinetics is studied. Effect of shape and flexibility of the molecule for nucleation and growth processes is investigated. Varying rate of kinetics reflects upon the transit of the system from constant type to independent type of nucleation. The trends in the Avrami parameter b and exponent n suggest sporadic nucleation. Crystal growth is interpreted as heterogeneous permeation of layered domains (or aggregates) formed by needle shaped calamitic molecules. Calorimetric observations at different crystallization temperatures CT and hold time t infer diffusion mediated crystallization.
UR - https://www.scopus.com/pages/publications/77955967753
UR - https://www.scopus.com/pages/publications/77955967753#tab=citedBy
U2 - 10.1515/zna-2010-8-916
DO - 10.1515/zna-2010-8-916
M3 - Article
AN - SCOPUS:77955967753
SN - 0932-0784
VL - 65
SP - 733
EP - 744
JO - Zeitschrift fur Naturforschung - Section A Journal of Physical Sciences
JF - Zeitschrift fur Naturforschung - Section A Journal of Physical Sciences
IS - 8
ER -