Materials Literature
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The dielectric properties of lithium iodate crystals of the hexagonal modification grown from solutions with pH = 6.2, 7.1, and 11.0 in the frequency range from 25 Hz to 1 MHz at temperatures of 290–420 K were investigated. The temperature dependence of the imaginary part of the permittivity was found to exhibit clear…
The Indium Tin Oxide(ITO) is known as a poorly sinterable material. The Spark Plasma Sintering(SPS) and the hot-pressing sintering(HP) were used to fabricate Indium Tin Oxide Ceramics from ITO nanoparticles. The maximum bulk density of 7.02 g/cm2(relative density; 98.2% TD)was obtained when sintered in Ar at 1000oC fo…
Abstract A mononuclear copper(II) complex, [2-ethoxy-6-{[3-(2-methyl-4-imidazolylmethyleneamino)propyl]iminomethyl}phenolato]copper(II) perchlorate [CuHL]ClO4 and its deprotonated complex at the imidazole moiety, [CuL]n, were prepared. The structure of [CuHL]ClO4 consists of a cation [CuHL]+ exhibiting a four-coordina…
In this work, we report dc conductivity and Hall effect results for glasses coated with commercial In2O3:Sn and SnO2:F. Van der Pauw Hall effect and resistivity measurements were used to carry out the sheet resistance of the samples and to determine their carrier density, mobility, and conductivity from 10 to 325 K. W…
The reaction of meso -tetra(benzo-15-crown-5)porphyrin (H 2 TCP) with the osmium carbonyl complex Os 3 (CO) 12 yieds the corresponding osmium(II) porphyrinate OsTCP(CO). The oxidation of OsTCP(CO) with air oxygen and hydrogen peroxide in neutral and acidic media was studied. A preparative method for the synthesis of o…
Abstract Chiral dopants with a spiro structure for nematic liquid crystals were synthesized from optically active 3,3′-(4H,4′H)-spirobi(2H-naphtho[1,2-b]pyran)-6,6′-dicarboxylic acid, and their helical twisting power (HTP) values were evaluated. Chiral dopants having the S configuration induced minus helices in the ho…
Tetragonal phase of YVO4:Eu3+ powders have been successfully synthesized via a molten salt synthesis process. During the process, rare earth nitrates and ammonium vanadate were used as precursors, the mixture of KCl and NaCl as a molten salt. As shown in XRD and SEM, the resultant product was a pure phase of YVO4 with…
The paper addresses structure formation in TiC-(VC, NbC, WC) based hard alloys with a nickel-chromium binder, which were prepared by the conventional process and by a process that excludes the additional preliminary operation of carbide synthesis. The alloys are studied by metallographic methods, X-ray phase analysis,…
Resonance enhancement of the quantum yield of polarized electrons from photocathodes based on strained short-period semiconductor superlattices is studied. The superlattice is a constituent of a Fabry-Perot optical cavity formed by the outer surface of the photocathode and the distributed Bragg reflector. An increase…
This chapter contains sections titled: Abstract Introduction Experimental Set-Up & Procedures Experimental Results and Discussion Summary & Conclusions Acknowledgements References
We study the Neumann boundary value problem for stationary radial solutions of a quasilinear Cahn-Hilliard model in a ball $B_R(mathbf{0})$ in $mathbb{R}^N$. We establish new results on the existence, uniqueness, and multiplicity (by "branching") of such solutions. We show striking differences in pattern formation pro…
During the last ten years, our research group has been applying metal-mediated self-assembly processes to the construction of multiporphyrin functional assemblies. The construction of well-defined and discrete supramolecular structures resulting from self-assembly requires the use of multiple and separated connections…
The objective of this study was to characterize the levels of free radicals in serum and antioxidase activity after microcapsules were implanted into the subcutaneous space of mice. cell viability was evaluated using ao/Eb staining. serum free radicals, malondialdehyde and superoxide dismutase levels were evaluated by…
The influence of vibronic interactions on the magnetic properties of the tetrameric square-planar mixed-valence d 0 -d 0 -d 1 -d 1 cluster with two-electron transfer is investigated. The dynamic vibronic problem has been solved taking into account the Heisenberg and double exchange. It was shown that the double exchan…
The present paper describes the kinetic study on the formation of LaFeO 3 .s with solid-state reaction technique. Pellet samples formed using La 2 O 3 and Fe 2 O 3 powdered mixture were isothermally calcined to produce the LaFeO 3 _ 5 compound at temperatures, 1273, 1323, 1373 and 1423K respectively. Powder XRD measur…
Nanocrystalline La0.50Ba0.50MnO3 manganite was synthesized by an optimized sol-gel method. The initial sample was subjected to step-by-step heat treatment under air atmosphere. The ion stoichiometry, the morphology of crystallites of ceramics, and the magnetic properties were studied. It is established that the averag…
in this study new poly(ether)urethanes (PeUs) based on aliphatic diisocyanates were synthesized with phospholipid-like residues as chain extenders. The primary objective was to prepare new polyurethanes from diisocyanates that are less toxic than the aromatic ones widely used in medical-grade polyurethanes, in order t…
Structural rearrangements taking place upon the annealing of solvent-crazed isotactic PP are studied by the direct microscopic method. Independently of the type of its crystalline structure, solvent-crazed PP undergoes shrinkage in a wide temperature interval, starting even from room temperature and up to its melting…
The surface finish of composite plates made using Resin Transfer Molding of glass/polyester is studied. A surface profilometer is used to measure the surface profile and to record raw data. The objective is to develop an objective method (rather than using human judgment) to differentiate the quality of one surface fr…
Electronic and magnetic properties of nanoscale materials are closely related to the atomic arrangement at the interface shared by different chemical elements. A very precise knowledge of the surface/interface structure is then essential to properly interpret the new properties coming out. Of a particular interest is…