Effects of magnetic nanoparticles with different surface coating on the phase transitions of octylcyanobiphenyl liquid crystal | Zendy

George Cordoyiannis | Zendy; Lynn K. Kurihara | Zendy; L. J. Martı́nez-Miranda | Zendy; Christ Glorieux | Zendy; Jan Thoen | Zendy

Open Access

Effects of magnetic nanoparticles with different surface coating on the phase transitions of octylcyanobiphenyl liquid crystal

Author(s) -

George Cordoyiannis,

Lynn K. Kurihara,

L. J. Martı́nez-Miranda,

Christ Glorieux,

Jan Thoen

Publication year - 2009

Publication title -

physical review e

Language(s) - English

Resource type - Journals

eISSN - 1550-2376

pISSN - 1539-3755

DOI - 10.1103/physreve.79.011702

Subject(s) - materials science , nanoparticle , coating , liquid crystal , magnetic nanoparticles , phase transition , condensed matter physics , surface (topology) , phase (matter) , nanotechnology , chemical physics , chemical engineering , chemistry , physics , geometry , optoelectronics , mathematics , organic chemistry , engineering

The impact of magnetic nanoparticles with different surface coating upon the isotropic-to-nematic and nematic-to-smectic- A phase transitions of the liquid crystal octylcyanobiphenyl is explored by means of high-resolution adiabatic scanning calorimetry. A shrinkage of the nematic range is observed, which is strongly dependent on the surface coating of the nanoparticles. The isotropic-to-nematic transition remains weakly first order while the nematic-to-smectic- A is continuous with the effective critical exponent alpha values (0.35 and 0.39, depending on the coating) between the pure octylcyanobiphenyl value of 0.31+/-0.03 and the theoretical tricritical value of 0.5.

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