Materials Literature
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The effect of an orienting electric field on the anomalies of the temperature dependence of the dielectric constant ε of the crystals TlInS2 and TlGaSe2 and of the pyroelectric current i in TlInS2 near phase transitions is investigated. It is found that the ε(T) profile of both crystals undergoes the same transformati…
The chelation between O,N-carboxymethyl chitosan (ONCMCh) and zinc sulfate in aqueous solution was studied by kinetic experiments and characterized by inductively coupled plasma (ICP) and UV spectrophotometry. The experimental data indicated that the chelating processes were greatly controlled by the reaction conditio…
Slow stable crack growth by a mechanism identified as a form of delayed hydride cracking has been studied on irradiated Zircaloy cladding. The background to the investigation was the formation of long axial cracks in defected fuel rods. Post-irradiation examination of such fuel rods has indicated that precipitation an…
Single crystals of , with extremely strong afterglow were investigated with photoconductivity experiments. The photocurrent excitation spectra were measured at 80 and 300 K and compared with photoluminescence excitation spectra. Experiments on single crystals without doping were also performed for comparison. The resu…
Multi-segment cores have been developed by cutting standard MnZn ferrite cores into thin segments and then re-assembling the segments together. All the segments were separated by a thin film of air or insulation materials of microscopic dimensions. The core loss properties of these experimental samples have been inves…
Electroactive conjugated polymers have been synthesized by electropolymerisation of increasing generations of dendrimers derivatized by peripheral bithiophene groups.
Dinuclear and tetranuclear copper(II) complexes of three polydentate diazine ligands (pahap, pmhap, bdpah), based on potentially bridging N–N single bond fragments, are reported. The 2∶2 complexes [Cu2(pahap)2(NO3)(H2O)2][NO3]3·H2O (1) and [Cu2(pmhap)2(NO3)2][NO3]2·3H2O (2) involve dinuclear centres bridged by two N–N…
Cu‐Zn alloys were deposited under potentiostatic conditions from cyanide baths with varied Cu + / Zn 2 + concentration ratio but with the same free CN − concentration. The Zn content of the deposits showed the maximum at around −1.4 V vs. Ag/AgCl as a function of the applied potential. The deposits obtained at −1.4 V…
Nanocrystalline diamond thin-films have been synthesized in CH4/Ar (argon) and CH4/N2 gas mixtures without the addition of molecular hydrogen. Atomic force microscopy analysis demonstrates that the C60/Ar films consist of hemispherical features about 150 nm in diameter with a height of 20 nm. The mean roughness over a…
We conduct numerical simulations on a simple model of a two-dimensional steady-state sheared foam, and define a quantity Γ that measures stress fluctuations in the constant-area system. This quantity reduces to the temperature in an equilibrium system. We find that the relation between the viscosity and Γ is the same…
Reducing the dimensionality can dramatically improve the physical properties of some compounds. Quasi two-dimensional palladium nanoparticles have been obtained using a graphite lattice as a template. The hexagonal symmetry of the carbon host lattice was found to impose a hexagonal symmetry on the Pd atoms (see Figure…
The results of a UV/VIS spectroscopic investigation of thin films of oxidized polypyrrole doped with p-toluenesulfonate, dodecylsulfate or copper phthalocyanine tetrasulfonate anions immediately after electrochemical synthesis and during heat treatment are presented. The absorption bands in the resulting spectra were…
Polyurethanes were synthesized using the high functional 4,4′-diphenylmethane diisocyanate (MDI), polyester polyol, and 1,4-butane diol. The synthesized polyurethanes were analyzed using differential scanning calorimeter (DSC), dynamic mechanical thermal analysis (DMTA), Fourier transform infrared (FTIR) spectrometer,…
Biodegradable polyurethanes with various hydrophilic-to-hydrophobic ratios and potential application for nonadhesive barriers in surgery and/or scaffolds for tissue engineering and bone substitutes were synthesized from polycaprolactone diol, mixtures of polycaprolactone and polyethylene oxide diols, hexamethylene- an…
High dielectric constant (Ba0.65Sr0.35)(Ti0.41Zr0.59)O3 (BSTZ) thin films were prepared on Pt/Ti/SiO2/Si substrates at 500 °C from the target composition of (Ba0.65Sr0.35)(Ti0.65Zr0.35)O3 by the rf magnetron sputtering technique and evaluated as a function of annealing temperature. The 95-nm-thick BSTZ films showed a…
The high-temperature phase of sodium ortho-phosphate, α -Na
By coupling microwave discharge with an Fe/HZSM-5 catalyst, novel effects have been observed for the conversion of NO to N2 in the presence of excess oxygen with high efficiency.
A new class of porphyrin containing hyperbranched polymers has been prepared via proton-transfer polymerisation utilising an A2 + B3 approach, thus providing an accelerated entry into the construction of branched multiporphyrin architectures.
Different characteristic surface structures such as capsules, regularly spaced droplets, and fibers are formed by electrostatic interaction between poly-L-lysine (PLL) and gellan gum via polyion complex (PIC) formation. Spherical droplet PIC capsules of varying diameters form in solutions. Some dyes adsorb on the surf…
Dibenzo-18-crown-6 ether derivatives bearing two (1, 2) or four (3) hydrolysable Si(OR)3 groups have been synthesised. Their hydrolysis and polycondensation gave rise to new hybrid organic–inorganic materials incorporating dibenzo-18-crown-6 ether moieties covalently linked to silica by two or four Si–C bonds. The com…