Crystallization kinetics in liquid crystals with hexagonal precursor phases by calorimetry

Sunkara Padmaja, Narayanan Ajita, Maddasani Srinivasulu, Sriram Ramchandra Girish, Venkata Gopala Krishna Murthy Pisipati, Dakshina Murthy Potukuchi

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish
Pages (from-to)733-744
Number of pages12
JournalZeitschrift fur Naturforschung - Section A Journal of Physical Sciences
Volume65
Issue number8
Publication statusPublished - 2010

All Science Journal Classification (ASJC) codes

  • Mathematical Physics
  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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