Materials Literature
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A detailed theoretical analysis of determining the sum of flexoelectric coefficients in nematic liquid crystals using the capacitance method is given. In the strong anchoring parallel aligned nematic (PAN) and hybrid aligned nematic (HAN) cells, the dependences of the capacitance on the sum of flexoelectric coefficien…
Abstract Enzymatic incorporation of carbohydrate-derived monomer units into hydrophobic polyester backbones represents a promising alternative to obtain new biodegradable oligomers and polymers. Immobilized lipases are efficient biocatalysts for copolymerization of β-butyrolactone and δ-gluconolactone, but only a syst…
The magnetism of different polar and nonpolar cuts of single-crystal oxide substrates has been analysed. In addition to their intrinsic diamagnetism, some crystals exhibit a Curie-law susceptibility, which is associated with 3d impurities at the 1 ppm level, except for MgO where it is ~30 ppm. Others exhibit an anhyst…
NiZn spinel ferrite nanofibers with diameters in 50-100 nm were fabricated by electrospinning followed by thermal treatment. Deploying a rotating collector, nanofibers can achieve certain degree of alignment. The morphology phase contents, static, and dynamic magnetic properties of ferrite fibers were experimentally s…
The magnetic and dielectric properties of the composites Ni0.35Cu0.18Zn0.45Co0.02Fe1.95O4+ x wt% BaTiO3(x = 0, 5, 10, 15, 20, 25) were investigated. All samples were sintered at 1080 °C for 3 h to obtain approximately equal real permeability and permittivity. X-ray diffraction results indicated that there had no obvio…
The influence of substrate strain on the magnetic properties of Co-Pt multilayers is investigated by density functional theory (DFT) and model calculations. The lattice parameters for strained Co-Pt multilayers, which are needed as an input for first-principle calculations, are determined by a hybrid approach where DF…
Magnetization reversal process in Nd-Fe-B nanocrystalline magnets was investigated by small-angle neutron scattering (SANS) using a non-polarized neutron beam. The magnetic-field dependence of the SANS intensities was obtained for as-deformed and Pr-Cu infiltrated Nd-Fe-B magnets. The SANS intensity variation with the…
ZrO2 doped with 7.5% (volume percent) nanoalumina ceramics were prepared by microwave sintering processes. The effects of nanoalumina additions and various sintering temperature on densification, phase composition, microstructure and mechanical properties of Al2O3-ZrO2 ceramics were investigated. The results show that…
The isolation of atomic-thin graphene sheets from bulk graphite has led to the discovery of a number of novel properties of graphene that have enormously benefited the development of nanotechnology [1], which has inspired the exploration of other 2D materials, such as transition metal dichalcogenides (TMDs), hexagonal…
We present the design and testing of a hybrid energy neutral cooling system for data centers' CPUs. The system operates as a passive heat-sink at normal operating conditions, and can provide active cooling when a boost in performance is required (i.e., overclocking) at zero cost by exploiting thermoelectric generators…
The 2D problem of excitation of a circular metamaterial cylinder by a filament source is numerically investigated. It is found that, when the relative permittivity and permeability are close to minus unity, high-Q resonances occur in cylinders of an electrically small diameter. Near- and far-field patterns are calcula…
In the pursuit of realizing quantum optical networks, a large variety of different approaches have been studied to achieve a single photon source on-demand. The common goal for these approaches is to harvest all the emission from a quantum emitter into a single spatial optical mode while maintaining a high signal-to-n…
The crystal and magnetic structures of TlFeS 2 and TlFeSe 2 are studied by neutron diffraction in the temperature range of 10–320 K. The structures of TlFeS 2 and TlFeSe 2 have monoclinic symmetry with the space group C 2/ m at room temperature. TlFeS 2 displays an antiferromagnetic phase at temperature below 200 K. T…
In the present work, Ba-doped lanthanum gallate (La1−xBaxGaO3−δ with x = 0, 0.05, 0.10, 0.15, 0.20) have been prepared by solid-state reaction method. X-ray diffraction confirms the formation of perovskite structure with orthorhombic symmetry. Furthermore, Ba doping leads to partial stabilization of rhombohedral phase…
One new eudesmane sesquiterpenoid (1) named ecdysantherol A and two new benzene derivatives ecdysantherols B (2) and C (3), together with five known benzene derivatives (4-8) were isolated from the stems of Ecdysanthera rosea. The structures of the new compounds were elucidated by extensive spectroscopic methods and X…
Polypyrrole-chitosan (ppy-chit) hollow nanospheres have been synthesised using a simple route wherein dispersion polymerization of pyrrole was followed by treatment with aqueous ammonia, centrifugation and dialysis. Ppy-chit hollow nanospheres were characterized by techniques including transmission electron microscopy…
In this paper, we have synthesized multifunctional magnetic particles (MNPs) using by two different ferrite submicrometer paticles (Fe3O4@HP and CoFe2O4@HP) with different surface properties. Two different multifunctional particles have the same particle sizes within the error tolerance of 4.5%. The concentration meas…
We fabricate granular Fe3O4nanoparticles with tunable particles sizes ranging from 20 to 250 nm using the solvothermal method. Magnetic stirring during the fabrication can further reduce the size of the particle. To investigate the high-frequency dynamic magnetic properties, the complex permeability and complex permit…
Rare earth-iron-boron permanent magnet materials exhibit large values of magnetocrystalline anisotropy. We have studied the dependence of the magnetization (moments) and the anisotropy energy on the change of the lattice parameter ratio c/a . The calculations were on the basis of the density functional theory, and wer…
Antibacterial and antioxidant polyphenols- chitosan agents have been elaborated through the adsorption of green tea and black tea extracts into chitosan. Their incorporation leads to an enhancement of the inhibitory effect of the biopolymer against the gram-negative and gram-positive bacteria. Voltammetry at a rotatin…