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Molecular Crystals and Liquid Crystals Volume 698, 2020 - Issue 1
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Articles

Birefringence of binary liquid crystalline mixtures of MBBA and PPMAECOBA in TCM, interferometric assessment

Mihai PostolacheFaculty of Automatic Control and Computer Engineering, “Gheorghe Asachi” Technical University, Iaşi, Romania;
,
Liliana Mihaela IvanFaculty of Physics, “Alexandru Ioan Cuza” University, Iaşi, Romania; Correspondence[email protected]
ORCID Iconhttp://orcid.org/0000-0001-9106-7566
ORCID Icon,
Nicoleta Puică-MelniciucFaculty of Orthodox Theology, “Alexandru Ioan Cuza” University, Iaşi, Romania;
,
Gabriel Grigore MariciucFaculty of General Medicine, “Gr. T. Popa” University of Medicine and Pharmacy, Iaşi, Romania
,
Dan Gheorghe DimitriuFaculty of Physics, “Alexandru Ioan Cuza” University, Iaşi, Romania;
&
Dana Ortansa DorohoiFaculty of Physics, “Alexandru Ioan Cuza” University, Iaşi, Romania;
Pages 78-86 | Published online: 12 Jul 2020
 
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Abstract

The mutual influence of two mesogenic components, namely a nematic liquid crystal N-(p-methoxy-bezylidene)-butylaniline (MBBA) and a lyotropic liquid crystal poly-(phenyl-methacrylic) ester of cetyloxybenzoic acid (PPMAECOBA) in tetra-chloromethane (TCM) is studied in this paper. The ordinary and extraordinary refractive indices of the mixtures, nematic liquid crystal and lyotropic liquid crystal were measured at 589.3 nm with a Rayleigh interferometer and some electro-optical parameters were computed. The main refractive indices, the birefringence, the main normalized polarizabilities and their difference are dependent on the mixture volumetric concentrations, proving the existence of the collective orientational interactions between the two types of liquid crystals.

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