Materials Literature
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The alignment and patterning of cellulose fibers under magnetic fields are reported. Static and rotating magnetic fields were used to align cellulose fibers with sizes ranging from millimeter to nanometer sizes. Cellulose fibers of the millimeter order, which were prepared for papermaking, and much smaller fibers with…
A perovskite-type oxide, La0.8Sr0.2MnO3, was synthesized by the organic solvent sol-gel method. The desired metal cations were chelated in a solution by using citric acid as the chelating agent and absolute ethanol as the solvent. The thermal decomposition of the metal carboxylate precursor gels was studied by thermog…
The nonisothermal crystallization kinetic of Bi x Y 3− x Fe 5 O 12 (0.25≤ x ≤1.00) powders prepared by coprecipitation process has been investigated. The activation energy of crystallization was calculated by differential scanning calorimetry at different heating rates. The activation energies of crystallization of Bi…
The processes of deformation and destruction of finite-thickness targets during the high-velocity impingement of a group of compact impactors were numerically simulated. Three-dimensional calculations with the use of the finite-element method were performed within the framework of an elastoplastic model of the medium.…
We analyze the problems encountered in the additional purification of mother liquors and the possibility of optimizing this process, using mother liquor for the crystal growth of lithium iodate, α-LiIO 3 , as a model system. The ability of some crystals, e.g., those of hexagonal lithium iodate, to absorb cation impuri…
We have developed a method of directing or bending carbon nanotubes (CNTs) in the desired direction along a structure. The new method utilizes careful positioning of a catalyst with respect to the structure, so that the CNTs growing from the catalyst experience an effective van der Waals force from the structure. The…
The structure, thermal expansion, and electrical properties of cation-deficient ferrocuprates R BaCuFeO 5 + δ ( R = Y, La), which are p -type semiconductors, are investigated. The linear thermal expansion coefficient of the yttrium-barium ferrocuprate decreases upon formation of vacancies in the A sublattice (Y, Ba),…
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This paper summarizes liquid-crystalline polymorphism of the asymmetrical 4-alkyloxybenzylidene-4 -alkyloxyanilines. In this group, containing 121 compounds, 6 types of mesophases were detected: nematic, smectic A, smectic C, smectic B, smectic I, and smectic G. Influence of both alkyl chain length on the type of meso…
The melt rheology of polyaniline (PANI)-dinonylnaphthalenedisulfonic acid (DNNDSA) gel nanocomposites (GNCs) with organically modified (modified with cetyl trimethylammonium bromide)-montmorillonite (om-MMT) clay has been studied for three different clay concentrations at the temperature range 120–160 °C. Field emissi…
Polycarbonate (PC)/modified clay nanocomposites were prepared, in the absence and presence of different amounts of maleic anhydride grafted polypropylene (PP-g-MA), by direct melt blending. Their structures, as well as mechanical, morphological and thermal properties, were characterized by X-ray diffractometry (XRD),…
Nanostructured silica based glass-ceramics samples of composition (100 - x)SiO2-xSnO2, with x from 1 to 10, have been synthesized by thermal treatment of precursor sol-gel glasses. The average size of the obtained SnO2 nanocrystals, calculated by using the X-ray diffraction, can be predetermined by using well-controll…
The coupling of mechanical and optical properties in semiconductor nanostructures can potentially lead to new types of devices. This work describes our theoretical examination of the mechanical properties of CdSe tetrapods under directional forces, such as may be induced by AFM tips. In addition to studying the genera…
In the present work, nanocomposites of polyaniline (PANI) and layered alpha-Zr(HPO4)2 x H2O (alpha-ZrP) were prepared using two different approaches: (i) the in situ aniline polymerization in the presence of the layered inorganic material and (ii) the layer-by-layer (LBL) assembly using an aqueous solution of the poly…
Thermal modification of nanodiamonds in the atmosphere of argon and hydrogen and their chemical modification with oleum and chlorine at different temperatures were studied. The effect of the modification conditions on the catalytic activity of palladium catalysts supported by nanodiamonds in the reaction of nitrobenze…
Conducting polymer composites of polyvinylferrocene and polypyrrole (PVF/PPy) were synthesized chemically by the in situ polymerization of pyrrole in the presence of PVF using FeCl3 as oxidant. Acetic (CH3COOH) and boric (H3BO3) acids were used as the synthesis medium. Effects of the synthesis medium on the properties…
Different stages of the study of taxonomical composition of centric diatoms in the Selenga River are considered. A revision of the species composition and a general systematic list are made. New for the Selenga River diatom species are discovered. The role of small-sized centric diatoms in different years and vegetati…
Abstract The substituted monomers 4a , c , d, 5a , b, 6a, 7a , b , and 8a of novel poly(diphenylamines), possessing the respective photochromic groups, were synthesized by the Stille cross‐coupling methodology ( Scheme ). The hyperbranched structures were characterized by 1 H‐ and 13 C‐NMR spectroscopy. The obtained m…
Vertical alignment of carbon nanocoils (CNCs) relative to a substrate in a polymer matrix has been demonstrated using dielectrophoresis under the parallel-plate electrode configuration. The CNCs were aligned toward the electric field with an AC frequency of 100 kHz and form a small aggregation of a CNC chain by the di…
Abstract Calcium carbonate biominerals are frequently analysed in materials science due to their abundance, diversity and unique material properties. Aragonite nacre is intensively studied, but less information is available about the material properties of biogenic calcite, despite its occurrence in a wide range of st…