Materials Literature
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The reaction of N,N,N′,N′-tetramethylmethanediamine with pheophorbide a methyl ester gave the corresponding 13″-dimethylaminomethyl derivative and 13-N,N-dimethylamide derivative of chlorin e 6 having a methyl acrylate moiety in the 15-position. Conditions were found for the synthesis of the latter both directly from…
We have investigated the effect of magnetic field on the austenite(γ)-ferrite(α) equilibrium in Fe-xNi alloys with x = 0, 2, 4 wt%. The α→γ and γ→α transformations have been followed as a function of applied magnetic field by a laser dilatometer installed in a 16T superconducting magnet. In addition, magnetic measurem…
It is known that bismuth antimony (Bi-Sb) alloy is not only a good thermoelectric material but also a material which demonstrates some interesting phenomena at low temperatures. We have synthesized composite alloys consisting of the Bi-Sb and magnetic transition metal Ni, and measured the thermoelectric and magnetic p…
A new crown ether-POM (POM = polyoxometalate) adduct with the molecular formula [(C 14 - H 20 O 5 ) 4 (H 3 O) 3 ]PMo 12 O 40 ・ 0.5CH 3 CN (1) was isolated from the mixed solvent of acetonitrile and methanol. The adduct is constructed from Keggin [PMo 12 O 40 ] 3− anions and [(C 14 H 20 O 5 ) - (H 3 O + )] and [(C 14 H…
The encapsulation of Pt nanoparticles into the cavities of MWNTs was prepared by pyrolysis of a mixture of Pt acetylacetonate and MWNTs under vacuum at 500 degrees C and subsequent thermal heating to form high surface area Pt nanostructure. Pat nanoparticles with an average size of 3.0 nm were found to be highly dispe…
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We report a comparative study of magnetotransport in high quality epitaxial and polycrystalline thin films of Sr2FeMoO6 deposited on single crystal substrates of SrTiO3 (STO) and Yttria-stabilized zirconia (YSZ) respectively. The polycrystallinity of the films on YSZ affects their magnetotransport significantly. The r…
WO x thin films are one of the candidates for the recording layer of write-once optical discs and the inorganic photoresist material used in heat-mode mastering. We have investigated the transformation mechanism of WO x during laser irradiation. As a result, we observed changes in the volume and crystallinity of WO x…
The results of simulation of processes of thermal annealing of porous silicon under the effect of high-temperature heating both in a homogeneous temperature field and under conditions of the presence of a linear temperature gradient in the system are reported.
Ternary iron-silicide Lu2Fe3Si5 is a superconductor with the high transition temperature Tc = 6.0 K despite the inclusion of Fe elements. Recent experimental reports strongly suggest the exotic superconductivity in this compound. We investigate the effect of non-magnetic impurities on the superconducting properties of…
During the past two decades, extensive studies of conductive polymers have been driven by their special properties, such as flexible solution and melt processability manufacturing, blendability with commodity polymers, good ambient stability, and unconventional electrical and optical properties.
Problem statement: The objective of this study is to compare the methods for approximating the positions of twist fiber in yarn structures. Computer Aided Design (CAD) is applied using parametric equation, spline curve and NURBS curve. The ideal twist fiber and fiber migration are studied in 3 dimensions. Approach: Th…
A kinetic model describing the biosynthesis of L-cysteine by Pseudomonas sp. TS1138 has been developed. The two enzymes catalyzing this pathway, L-cysteine synthetase (CS) and L-cysteine desulfhydrase (CD), follow Michaelis-Menten kinetics with noncompetitive inhibition of CS by L-cysteine. From measurements of interm…
The high-pressure structural behavior of Sr2CrReO6 has been studied experimentally using synchrotron radiation and the diamond anvil cell and theoretically using density functional theory. The experimental zero-pressure bulk modulus is B 0=170±4 GPa and the pressure derivative is B 0′=4.7±1.0. These results compare we…
Poly(m-toluidine) (PmT), a derivative of polyaniline, has been prepared by chemical oxidation polymerization method. The synthesized PmT powder is blended with plasticized polyvinyl chloride (PVC) to achieve 20 μm thick self-supported films. These films were irradiated with 60 MeV Si5+ ions at three different fluences…
77 Se NMR signals were observed in the metallic and insulating states of the quasi-one-dimensional organic compound (DIETSe) 2 GaCl 4 . The 77 Se NMR spectra at low temperatures are broadened, indicating the presence of magnetic ordering. The shape of the spectra in the magnetically ordered state is characteristic of…
From first-principle band structure calculations the Heusler alloys Fe 2 MnSi and Co 2 MnSi are predicted to be half-metals, if the ferromagnetic state is assumed. In reality, however, Fe 2 MnSi exhibits a complex magnetic state with antiferromagnetic components, while Co 2 MnSi is ferromagnetic with high Curie temper…
Monodispersed Fe3O4 (magnetite) nanoparticles are synthesized by non-aqueous thermal decomposition route. The powder XRD reveals single phase spinel structure with 60 angstroms particle size. The TEM image shows nearly monodispersed spherical particles with log-normal median diameter of 49 A and size distribution in I…
Silicon nitride (Si 3 N 4 ) was synthesized by a selective combustion reaction of silicon powder with nitrogen in air. The α/β‐Si 3 N 4 ratio of the interior product could be tailored by adjusting the Si 3 N 4 ‐diluent content in the reactant mixtures. The synthetic β‐Si 3 N 4 showed a well‐crystallized rod‐like morph…