The alignment of nematic liquid crystal by the Ti layer processed by nonlinear laser lithography

It is well known that the alignment of liquid crystals (LCs) can be realised by rubbing or photoalignment technologies. Recently, nonlinear laser lithography (NLL) was introduced as a fast, relatively low-cost method for large area nano-grating fabrication based on laser-induced periodic surface structuring. In this letter for the first time, the usage of the NLL as a perspective method of the alignment of nematics was presented. By NLL, nanogrooves with about 0.92 μm period were formed on Ti layer. The nanostructured Ti layer (NSTL) was coated with oxidianiline-polyimide film with annealing of the polymer followed without any further processing. Aligning properties of NSTLs were examined with combined twist LC cell. The dependencies of the twist angle of LC cells and azimuthal anchoring energy (AE) of layers on scanning speed and power of laser beam during processing of the Ti layer were the focus of our studies as well. The maximum azimuthal AE, obtained for pure NSTL, is comparable with photoalignment technology. It was found that the deposition of polyimide film on NSTL leads to the gain effect of the azimuthal AE. Also, atomic force microscopy (AFM) study of aligning surfaces was carried out.     

Convergence of the grid method in the eigenvalue problem for the Helmholtz operator in a right triangle

We prove convergence of difference schemes to generalized solutions of the Helmholtz operator with a coefficient from L_p(), where is a right triangle.Translated from Vychislitel'naya i Prikladnaya Matematika, No. 64, pp. 39–45, 1988.     

Effect of some components of photosensitive composition on the sensitometric characteristics of the materials for recording holograms

Effect of ingredients of the light sensitive composition of registering layer on the photographic parameters of halosilver photographic materials for recording holograms is considered.     

Nucleophilic reactivity of the peroxide anion in microemulsions of the “oil-in-water” type in the decomposition of phosphate and toluenesulfonate esters

The kinetics of the reaction of the 4-nitrophenyl esters of diethylphosphoric and 4-toluenesulfonic acids with HO^– and HOO^– anions in microemulsions of the “oil-in-water” type was studied. It was shown that the reactivity of the HOO^– anion depends on the nature of the detergent forming the microemulsion and decreases in the order cetyltrimethylammonium bromide > Triton X-100 > sodium dodecyl sulfate. It was established that concentration of the reagents on the surface of the microdrops leads to an increase of 2–3 orders of magnitude in the rate during the transition from aqueous solutions to the microemulsion.     

Magnetic susceptibility of mercury selenide doped with iron

The electrical and magnetic properties of mercury selenide single-crystals doped with iron are studied over the temperature range 80–400 K in magnetic fields of 0–8 kOe. The Fe distribution coefficient in HgSe is determined using the isotopic solution method. It is found that the Fe impurity in the mercury selenide lattice is electrically inactive. With growth in Fe concentration the paramagnetism of the specimens studied increases. The results of the magnetic susceptibility study are evaluated within the framework of crystalline field theory.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 11, pp. 48–51, November, 1990.     

Synthesis and structural characteristics of fac-ReCl3[P(OEt)3]3 a route to the phosphite complexes

Reaction of the oxo-complex ReOCl₃(PPh₃)₂ with an excess of triethylphosphite yields a deoxygenated rhenium phosphite complex fac-ReC1₃[P(OEt)₃]₃; its structure was confirmed by ¹H NMR and IR spectroscopy.     

Determination of the complex modulus of elasticity of soft viscoelastic materials

A method of determining the complex modulus of elasticity of soft viscoelastic materials is proposed. This method is based on the measurement of the dynamic characteristics of a three-layer symmetrical bar, in which the investigated material forms the middle layer, and on the subsequent calculation of the characteristics of the soft material from the experimental data obtained.N. E. Zhukovskii Central Aerohydrodynamics Institute, Moscow Branch. Translated from Mekhanika Polimerov, No. 1, pp. 178–181, January–February, 1976.