Materials Literature
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We show an unconscious self-assembling ability of block copolymers, that is, spontaneous perpendicular orientation of nanocylinders in a block copolymer thick film of polystyrene- block -polyethylenebutylene- block -polystyrene (SEBS) triblock copolymer. The perpendicular orientation of cylinders was obtained when the…
A method of magnetic field analysis which takes eddy currents into account in laminated steel core is extended into loss calculation to investigate the loss reduction of reactor connected to inverter power supply. In the proposed method, the iron loss in the laminated core can be calculated considering the flux and ed…
We study the tunnel magnetoresistance (TMR) and spin transport in ferromagnetic graphene junctions composed of ferromagnetic graphene (FG) and normal graphene (NG) layers. It is found that the TMR in the FG/NG/FG junction oscillates from positive to negative values with respect to the chemical potential adjusted by th…
Transverse-field muon-spin rotation measurements performed on two samples of LiFeAs demonstrate that the superfluid stiffness of the superconducting condensate in relation to its superconducting transition temperature is enhanced compared to other pnictide superconductors. Evidence is seen for a field-induced magnetic…
Catalytic performances of nanostructured mesoporous TiO 2 –ZrO 2 mixed oxides impregnated by Pd and/or Au were studied in toluene total oxidation in a fixed bed microreactor and with “operando” DRIFT. Mesoporous TiO 2 –ZrO 2 mixed oxides with various Ti:Zr mole ratio of 80/20, 50/50 and 20/80, high surface areas were…
White light emission across the extended visible region of the electromagnetic spectrum from the ZnO–porous silicon (PS) nanocomposite is reported. Nanocrystallites of ZnO were grown inside the spongy structures of PS by the chemical route of sol–gel spin coating. The property of the material arises from versatile int…
Abstract Zwitterionic “sandwiches” : Combined preparative, spectroscopic and theoretical studies on the syntheses, structures and electronic properties of zwitterionic iron(II) and cobalt(II) sandwich complexes [M( Me Tpmd) 2 ] containing κ 3 N ‐coordinated tris(pyrazolyl)methanide ligands ( Me Tpmd; see picture) are…
Abstract The influence of the choice of temperature, pH value, counter‐ion, deposition time, and seed layer on the morphology as well as electrical properties of ZnO films grown from chemical bath deposition (CBD) are discussed. Consequently, oriented ZnO films with various microstructures can be synthesized by contro…
Spin crossover: The photomagnetic properties of a series of [{Fe(NCS)(py-X)}(2)(bpypz)(2)] (NCS=thiocyanate, py=pyridine, X=4-Mepy, py, 3-Mepy, 3-Clpy and 3-Brpy, and bpypz=3,5-bis(pyridine-2-yl)pyazolate) binuclear complexes are close to the antiferromagnetic response of [{Fe(NCS)(3,5-dmpy)}(3)(bpypz)(2)] (3,5-dmpy=3…
A methodology to evaluate hysteresis losses in iron sheets under dc-biased inductions is presented in this work. Based on several experimental investigations of six different iron sheets used in the fabrication of electrical machines, an improvement of the classical Steinmetz equation is proposed. This technique can b…
Abstract Composites based on multiwall carbon nanotubes (MWCNTs) and the block copolymer styrene‐butadiene‐styrene with two different contents of styrene have been investigated and their electrical conductivity and mechanical properties have been evaluated. The composites were prepared by a solution casting procedure,…
A different ``Hubbard energy control'' mechanism of the insulator-metal transition (IMT) in Mott-Hubbard insulators is discussed. This mechanism can be initiated by the lattice compression and it is driven by a spin crossover of $3{d}^{5}$ ions from the high-spin state to the low-spin state. The spin crossover suppres…
The electronic coupling values and approximate energy transfer rates between semiconductor single-wall carbon nanotubes are calculated using two different approximations, the point dipole approximation and the distributed transition monopole approximation, and the results are compared. It is shown that the point dipol…
This paper investigates an efficient macroscopic modeling method for laminated iron cores made of grain-oriented silicon steel sheets. Under actual operating conditions, the material exhibits nonlinearity as well as a strong anisotropy resulting in a nonuniform distribution of the iron loss and the flux within each la…
Abstract The reaction of nickel thiocyanate with pyrazine in a 1:2 ratio leads to the new ligand‐rich 1:2 (ratio metal/ligand) compound [Ni(SCN) 2 (pyrazine) 2 ] n ( 1 ), in which the metal atoms are coordinated by four N atoms of pyrazine ligands and two N atoms of thiocyanate anions in a slightly distorted octahedra…
Cobalt doped zinc oxide nanorods Zn 1− x Co x O ( x = 0.01, 0.10) have been synthesized by a hydrothermal process with Zn(NO 3 ) 2 , Co(NO 3 ) 2 , NH 4 OH, CO(NH 2 ) 2 and C 2 H 5 OH at 150 °C for 1 h. X-ray diffraction and scanning electron microscopy were used to characterize the crystalline structure, size and morp…
We investigate how defects in bipolar shells of liquid crystal evolve when the boundary conditions for the nematic director n at the outer surface of the shell are changed from tangential to homeotropic. When the boundary conditions for n are tangential, these bipolar shells are characterized by the presence of two pa…
Hex nut: An emerging synthetic approach based on metal-organic coordination-polymer templates has been used to fabricate micro- and nanoscale crystals. By using a diverse range of molecular building blocks coupled with conventional synthetic techniques, it is possible to synthesize ZnO crystals with tailored sizes, sh…
The implementation of a new soft chemical constraint for the reverse Monte Carlo (RMC) program RMCProfile , based on bond valence sum (BVS) calculations, is described and its advantages for the analysis of `total scattering' diffraction data collected from disordered crystalline systems discussed. The inclusion of the…
Polynuclear lanthanide hydroxide complexes featuring the cubane-like [Ln(4)(mu(3)-OH)(4)](8+) [Ln = Eu(III), Gd(III)] cluster core have been synthesized by controlled hydrolysis of the lanthanide ions using nicotinic acid as the ancillary ligand. The synthetic procedure has been found to significantly influence the na…