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Mayamaea vietnamica sp. nov.: a new, terrestrial diatom (Bacillariophyceae) species from Vietnam
Kezlya, Elena,Glushchenko, Anton,Kociolek, John Patrick,Maltsev, Yevhen,Martynenko, Nikita,Genkal, Sergei,Kulikovskiy, Maxim The Korean Society of Phycology 2020 ALGAE Vol.35 No.4
A new diatom species, Mayamaea vietnamica sp. nov., is described from Cát Tiên National Park in Vietnam. This species was discovered and described from soil samples. Algae from soil ecosystems in Vietnam are almost unknown. The new species is described on the basis of an integrated approach with molecular and morphological data, and comparison with similar species. In terms of molecular data, 18S rDNA (including V4 domain), and partial rbcL plastid genes show M. vietnamica sp. nov. is most closely related to M. terrestris N. Abarca and R. Jahn, and together they form a monophyletic group relative to other members of the genus. M. vietnamica sp. nov. differs from other species in the genus by the number of striae and areolae in 10 ㎛, number of areolae per stria, as well as shape and presence or absence of axial and central areas.
Mechanism of Formation of Three Dimensional Structures of Particles in a Liquid Crystal
West, John L.,Zhang, Ke,Liao, Guangxun,Reznikov, Yuri,Andrienko, Denis,Glushchenko, Anatoliy V. The Korean Infomation Display Society 2002 Journal of information display Vol.3 No.3
In this work we report methods of formation of three-dimensional structures of particles in a liquid crystal host. We found that, under the appropriate conditions, the particles are captured and dragged by the moving isotropic/nematic front during the phase transition process. This movement of the particles can be enhanced significantly or suppressed drastically with the influence of an electric field and/or with changing the conditions of the phase transition, such as the rate of cooling. As a result, a wide variety of particle structures can be obtained ranging from a fine-grained cellular structure to stripes of varying periods to a course-grained "root" structures. Changing the properties of the materials, such as the size and density of the particles and the surface anchoring of the liquid crystal at the particle surface, can also be used to control the morphology of the three-dimensional particle network and adjust the physical properties of the resulting dispersions. These particle structures may be used to affect the performance of LCD's much as polymers have been used in the past.
Choi, Byeongdae,Song, Seongkyu,Jeong, Soon Moon,Chung, Seok-Hwan,Glushchenko, Anatoliy Optical Society of America 2014 Optics express Vol.22 No.15
<P>We report an optical film with electrically tunable birefringence in which the liquid crystals (LCs), mixed with the host polymer, form long-range ordering. The film was prepared through polymerization without phase separation between the LCs and polymers. Driving voltage below 30 V for full switching of birefringence is achieved in a 6 μm-thick film. Electro-optical investigations for the film suggest that the long-range ordering of the LCs mixed in the film caused by polymerization lead to rotations of the LCs as well as optical anisotropy in the film. These films with electrically tunable birefringence could have applications as flexible light modulators and phase retardation films for 2D-3D image switching.</P>
Preparation of ferroelectric nanoparticles for their use in liquid crystalline colloids
Atkuri, H,Cook, G,Evans, D R,Cheon, C-I,Glushchenko, A,Reshetnyak, V,Reznikov, Yu,West, J,Zhang, K Institute of Physics Publishing in association wit 2009 Journal of optics A, Pure and applied optics Vol.11 No.2
<P>In this paper we summarize our many years of experience in the preparation and optimization of stable colloids of ferroelectric nanoparticles dispersed in an isotropic carrier and in a liquid crystal host. The colloids are of interest for use in electro-optic devices, photorefractive hybrids and nonlinear optical elements. We also outline some of the most interesting features the nanoparticles bring to liquid crystals, along with the potential of these relatively new colloids.</P>
Switchable Response of Ferroelectric Nanoparticle Doped Polymer-Dispersed Liquid Crystals
Shim, Hyunseok,Lyu, Hong-Kun,Allabergenov, Bunyod,Garbovskiy, Yuriy,Glushchenko, Anatoliy,Choi, Byeongdae American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.10
<P>In this study, we doped polymer-dispersed liquid crystals (PDLCs) with barium titanate (BaTiO3, BTO) nanoparticles to investigate the effects of particle size on the electro-optical properties of the suspensions, such as the driving voltage and response time. We mixed BTO nanoparticles having various sizes of 8 nm, 20 nm, and 2 mu m, and liquid crystals (LCs) (E7) prior to blending the LCs and pre-polymers (NOA 65). We fabricated the PDLC films using the polymerization-induced phase-separation (PIPS) method. The film surface was irradiated with UV (365 nm) light for 3 min to induce phase separation between the LC and the polymer. According to the results, the 10% transmittance voltage (V-10) improved from 18.2 V to 6.8 V by the addition of 0.3 vol% of 8 nm BTO particles to the PDLC. The response time also decreased from 15.2 ms to 8.4 ms. Smaller particles were distributed more uniformly within the sample, which resulted in a reduction of the V-10 and response time of the PDLCs. The results obtained imply that nanoscale ferroelectric particle doping is a powerful tool to tune electro-optical properties of liquid crystals based systems, including improving the electrical performances without compromising other important characteristics, such as the haze of the PDLC devices.</P>