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11.
DS Zhulai SA Bugaychuk GV Klimusheva TA Mirnaya VN Asaula VI Handziuk 《Liquid crystals》2017,44(8):1269-1276
The class of thermotropic ionic liquid crystals (LCs) of the metal alkanoates possesses a number of unique properties, such as intrinsic ionic conductivity, high dissolving ability and ability to form time-stable mesomorphic glasses. These ionic LCs can be used as nanoreactors for the synthesis and stabilisation of different types of nanoparticles (NPs). Thus, some semiconductors, metals and core/shell NPs were chemically synthesised in the thermotropic ionic liquid crystalline phase (smectic A) of the cadmium octanoate (CdC8) and of the cobalt octanoate (CoC8). By applying the scanning electron microscopy, the cadmium and cobalt octanoate composites containing CdS, Au, Ag and core/shell Au/CdS NPs have been studied. NPs’ sizes and dispersion distribution of the NPs’ size in the nanocomposites have been obtained. 相似文献
12.
S. Bugaychuk G. Klimusheva Y. Garbovskiy T. Mirnaya A. Ischenko 《Opto-Electronics Review》2006,14(4):275-279
The dynamic holography in new composite materials based on a novel class of metal-alkanoate ionic liquid crystals (ILCs) is
studied experimentally and theoretically. The composites are formed as a dielectric dye film covered by lyotropic metal-alkanoate
ILC and ionic smectic glasses with doped dye molecules. The dynamic gratings are created by nanosecond pulses of double frequency
Nd:YAP laser, the recording demonstrates fast erasure time of residual thermal gratings. The nonlinear optical properties
are determined by the resonance nonlinearity in photosensitive centres of ILC. Note, that permanent relief gratings will be
formed on a dielectric dye film only as well as in composite cells either with nematic LC or with polymers under action of
pulsed laser radiation. Lyotropic ILC layer applied over the dye film provides the dynamic regime of grating recording in
composite cells. We found a secondary thermal grating is much smaller, the conductive ILC matrix provides effective heat dissipation
and erasure of this thermal grating. A theory of Raman-Nath self-diffraction holography on thin films followed from the wave
equation and the nonlinear mechanism of absorption saturation is developed to explain experimental results. 相似文献
13.
G. V. Klimusheva Yu. Garbovskii S. Bugaichuk A. S. Tolochko A. V. Gridyakina A. P. Polishchuk T. A. Mirnaya 《High Energy Chemistry》2009,43(7):532-535
Novel nanocomposite materials based on an ordered mesomorphic glass of metal alkanoates have been proposed for fast transfer
and processing of optical information. Metal alkanoate salts when heated form a smectic mesophase which can be easily supercooled
forming an ordered mesomorphic glass at room temperature. The glass has the structure of the smectic-A phase: electrostatic
cation-anion layers alternate with bilayers of alkane chains. The mesomorphic glass is a universal matrix for organic and
inorganic nanoinclusions and nanosized crystals. In this paper, the structure of the cells of the mesomorphic glasses with
various inclusions and their nonlinear optical properties, which become evident upon the impact of pulsed laser radiation
with an intensity of up to 5.5 MW/cm2, have been investigated. 相似文献
14.
15.
Investigation of molecule properties from electronic absorption spectra of solid and liquid crystals
Among the achievements of 20th century, there is the origin and violent development of the low-temperature technique and low-temperature spectroscopy of molecular crystals in the polarized light. Many obtained results became possible due to the close cooperation between experiment investigators and theorists. This short review traces the evolution of only one trend in the physics of molecular crystals, namely, the investigation of energetic and spatial structure of molecules from the analysis of electronic spectra of molecular crystals. First, for this purpose the possibilities of using the electronic spectra of molecular crystals at low temperatures benzene derivatives and the electronic spectra of liquid ionic crystals are considered. The results of investigations of the electronic absorption spectra for the new class of liquid crystals, namely, ionic metal-organic smectics are presented. Changes in the structure of doping molecules in the ionic liquid crystals under the influence of the dc electric field are analyzed. 相似文献
16.
The investigation is made of the electron absorption spectra of pure and impure crystals of cholesteryl benzoate at 4, 2K and their Bragg reflection spectra as a function of impurity concentration (0,1 to 10%) and mesomorphic range temperature. The discrete structure of the electron absorption spectra is revealed and explained. The regularities of the mesophase order degree variation with temperature are repoted. The anomalous transmission of light by the cholesteryl benzoate mesophase (the Borrman effect analog) is measured as a function of temperature and impurity concentration. 相似文献
17.
Yuriy Garbovskiy Alexander Koval'chuk Alexandra Grydyakina Svitlana Bugaychuk Tatyana Mirnaya Gertruda Klimusheva 《Liquid crystals》2007,34(5):599-603
The electrical properties of ionic smectic liquid crystal (ISLCs), specifically, (i) oriented and non-oriented samples of lyotropic ISLC potassium caproate and (ii) oriented samples of thermotropic ISLC cobalt decanoate, are investigated in detail. The electrical conductivity of lyotropic smectic potassium caproate is higher than that of isotropic electrolytes. A giant anisotropy in the electrical conductivity of oriented samples of thermotropic ISLC cobalt decanoate is observed. The mobility of charge carriers in lyotropic ISLC is measured for the first time. The unusual electrical properties of ISLCs, which are governed by their layered structure, show that they have application potential in optoelectronic devices. 相似文献
18.
G. V. Klimusheva L. M. Yagupol'skii R. V. Yaremko 《Theoretical and Experimental Chemistry》1969,5(3):254-258
The electronic spectra of benzyl fluoride, benzal fluoride, and benzotrifluoride have been studied in polarized light at 4 K. An attempt is made to interpret the special features observed in the spectra by associating them with the effect of the different fluoromethyl substituents. 相似文献
19.
G. Klimusheva I. Dmitruk T. Mirnaya A. Tolochko S. Bugaychuk A. Naumenko 《Liquid crystals》2013,40(7):980-988
Structural and optical properties of cadmium alkanoates nanocomposites with cadmium sulfide (CdS) quantum dots (QDs) have been studied by using various techniques: small angle X-ray scattering, transmission electron microscopy, optical absorption spectroscopy and photoluminescence. QDs are chemically synthesised in thermotropic ionic liquid crystalline (ILC) phase of cadmium alkanoates that have smectic-type ordering and are used as nanoreactors. Anisotropic glassy nanocomposites are obtained by rapid cooling the thermotropic ILC nanocomposites to the room temperature. For synthesis of CdS QDs are used cadmium capronate matrix or cadmium octanoate matrix and their binary mixture. Our results show that in the new cadmium alkanoates matrices, the CdS QDs have a small dispersion of their sizes, their shape is nearly spherical, they are stable over time and they are ordered in a layered smectic A matrix. QDs in cadmium octanoate and in cadmium capronate matrices have the dominant characteristic sizes of 2.7 and 2.8 nm, respectively. In the binary mixture, the QDs have two dominant characteristic sizes of 2.7 and 3.6 nm. The glassy nanocomposites show spectra both of absorption and of photoluminescence in near-ultraviolet and blue visible spectral range. 相似文献