Effect of magnetic nanoparticles on the nematic-smectic-A phase transition

Mukherjee, Prabir K. and Chattopadhyay, Amit K. (2017). Effect of magnetic nanoparticles on the nematic-smectic-A phase transition. Journal of Molecular Liquids, 242 , pp. 612-617.

Abstract

Recent experiments on mixed liquid crystals have highlighted the hugely significant role of ferromagnetic nanoparticle impurities in defining the nematic-smectic-A phase transition point. Structured around a Flory-Huggins free energy of isotropic mixing and Landau-de Gennes free energy, this article presents a phenomenological mean-field model that quantifies the role of such impurities in analyzing thermodynamic phases, in a mixture of thermotropic smectic liquid crystal and ferromagnetic nanoparticles. First we discuss the impact of ferromagnetic nanoparticles on the isotropic-ferronematic and ferronematic-ferrosmectic phase transitions and their transition temperatures. This is followed by plotting and discussing various topologies in the phase diagrams. Our model results indicate that there exists a critical concentration of nanoparticle impurities for which the second order N-SmA transition becomes first order at a tricritical point. Calculations based on this model show remarkable agreement with experiment.

Publication DOI: https://doi.org/10.1016/j.molliq.2017.07.056
Divisions: Engineering & Applied Sciences > Mathematics
Engineering & Applied Sciences > Systems analytics research institute (SARI)
Additional Information: © 2017, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Uncontrolled Keywords: liquid crystals,nanoparticles,phase transition,Electronic, Optical and Magnetic Materials,Atomic and Molecular Physics, and Optics,Condensed Matter Physics,Spectroscopy,Physical and Theoretical Chemistry,Materials Chemistry
Full Text Link:
Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
Published Date: 2017-09
Authors: Mukherjee, Prabir K.
Chattopadhyay, Amit K. ( 0000-0001-5499-6008)

Export / Share Citation


Statistics

Additional statistics for this record