Confinement Effect in a Thick Layer of LC Lanthanide Complex

Proceedings

Polushina, Galina¹  Lezova, Irina²  Polushin, Sergey³ 

[1] Author to whom correspondence should be addressed.;Department of Physics, St. Petersburg State University, Universitetskaya nab. 7/9, St. Petersburg 199164, Russia;Presented at the 1st International Electronic Conference on Crystals, 21–31 May 2018. Available online: https://sciforum.net/conference/IECC_2018.

关键词: phase transition;    metallomesogen;    confinement;   

DOI  :  10.3390/IECC_2018-05252

学科分类：社会科学、人文和艺术（综合）

来源: mdpi

【 摘 要 】

The structure of metallomesogen complexes differs essentially from that of calamitic liquid crystals, which emerges in their physical properties. We studied anomalous features of the transition from the nematic to isotropic phase in the ytterbium-based liquid crystal complex. For this, two approaches were used. In the first approach, we showed that the experimental values of the dielectric and optical anisotropies measured near the phase transition turned out to be substantially smaller than their calculated values. This evidently occurs because the phase transition temperature in the deep region of the experimental cell differs from that near the surface of the cell. Secondly, the temperature of N–I transitions in metallomesogenic layers within glass sandwich cells is obtained directly by means of the polarization microscope method. It was found that the phase transition temperature drops in more than ten degrees when reducing the metallomesogenic layer thickness from 200 to 5 microns. The calamite liquid crystals show the confinement effect only within the interstice of the specific size smaller than one micron. An anomalous confinement effect can be caused by a strong interaction of the molecular complexes with each other.

【 授权许可】

CC BY