Materials Literature
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Continuous series of solid solutions of strontium and lead apatite Sr(10−x)Pbx(PO4)6(OH)2 (0 ⩽ x ⩽ 10), synthesized in aqueous media have been investigated by X-ray powder-pattern fitting, 31P MAS NMR and IR spectroscopy. The lattice dimensions and the IR frequencies of the solid solutions vary linearly with the atom%…
Abstract Strain gradient implies an important characteristic in localized damage deformation, which can be observed in the softening state of brittle materials, and strain gradients constitute the basic behaviours of localization failure area of the materials. The most important point in strain gradient is its damagin…
The relative stability of the ferroelectric rhombohedral ${(F}_{R})$ and antiferroelectric orthorhombic ${(A}_{O})$ phases of $({\mathrm{Pb}}_{1\ensuremath{-}x}{\mathrm{Ba}}_{x}){\mathrm{ZrO}}_{3}$ has been investigated as a function of ${\mathrm{Ba}}^{2+}$ concentration (x) using phenomenological theory consideration…
Abstract The mechanical properties of blends of polyamide6 (PA6) and ethylene vinyl acetate (EVA) at a blending composition of 0–50 wt % EVA were studied. The notched Izod impact strength of PA6 increased with the incorporation of EVA, the increase being more than 100% compared to PA6 at 10% EVA. The tensile strength…
We have prepared silver selenide nanowires by a novel synthesis technique. The nanowires were produced through template directed synthesis, in which we used a porous alumina membrane as the template. Silver was deposited on one surface and in the pores close to that surface of the template, followed by electro-deposit…
Four new mononuclear complexes of formula Cd(PN)(4)(NCS)(2) (A), Cd(PNN)(4)(N(3))(2) (B), Zn(PNN)(4)(N(3))(2) (C), and Zn(PNN)(2)(NCS)(2) (D), where PNN stands for 2-(4-pyridyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide and PN for 2-(4-pyridyl)-4,4,5,5-tetramethylimidazoline-1-oxyl, were synthesized and structural…
Abstract Chemical cellulose (dissolving pulp) was prepared from ascidian tunic by modified paper‐pulp process (prehydrolysis with acidic aqueous solution of H 2 SO 4 , digestion with alkali aqueous solution of NaOH/Na 2 S, bleaching with aqueous NaOCl solution, and washing with acetone/water). The α‐ cellulose content…
Resonant Raman spectra of individual single-walled carbon nanotubes (SWNTs) and thin SWNT bundles have been acquired by scanning confocal Raman microscopy. The position of several Raman modes was followed in dependence of the diameter-dependent radial-breathing modes (RBMs) and the excitation energy. For semiconductin…
Three homologous azobenzene (Az)-containing urea amphiphiles having two, one, and no hydrogen(s) at the terminal nitrogen of urea were synthesized by stepwise substitutions with methyl group(s). The spreading behavior, molecular packing, and photomechanical response of the Langmuir monolayers on water were investigate…
Abstract Samples of polyacrylamide (PAAm), poly(acrylic acid) (PAA), and their complex were γ‐irradiated at different doses, namely 48, 96, and 144 KGy. The examination of the infrared spectra of these samples showed that there are no significant observable changes in their spectral features apart from slight changes…
Diffusion of the radioactive isotopes 45Ca and 133Ba in alkali alkaline-earth silicate glasses of compositions 2O·2CaO·4SiO2 with = Li, K, Cs and K2O·2BaO·4SiO2 was investigated at temperatures below the respective glass-transition temperatures. The diffusion profiles of the radiotracers were recorded by means of an i…
Poly(ethyleneoxide)-copoly(propyleneoxide) (PEO-PPO) polymer coatings were evaluated for their resistance to the attachment of the marker organism Serratia marcescens and the skin-borne bacteria Staphylococcus epidermidis. The copolymers were adsorbed onto poly(styrene) films-chosen as simplified physicochemical model…
S.5627-5629
X-ray powder diffraction with synchrotron radiation was used for the first time to study in situ diamond crystallization from the Fe−Ni−C melt at pressures up to 6 GPa and temperatures up to 1700 K. At 5.2 GPa over the whole temperature range of diamond crystallization (1510−1605 K), the melt is in equilibrium with bo…
The effects of Dy co-doping on the thermoluminescence (TL) characteristics of K 2 Ca 2 (SO 4 ) 3 : Eu phosphor are studied. Though the sensitivity of the K 2 Ca 2 (SO 4 ) 3 : Eu phosphor is decreased by five times to get the sensitivity slightly less than that of CaSO 4 : Dy, the broadness of the glow peak is increase…
Vesicular structures are promising materials for encapsulation applications, and vesicles composed from block copolymers are attractive in this regard because of their stability and tunability. However, vesicle formation from copolymers generally requires specialized procedures. This article demonstrates that ethylene…
The local dynamics of 10 substituted polyacetylenes in the glassy state have been investigated using a quasielastic neutron scattering technique in a time range of picoseconds to several tens of picoseconds to see a relationship between the local mobility and the gas permeability of these polymers. Even in the glassy…
The elasticity of commonly known poly(butylene terephthalate)−poly(tetramethylene oxide) (PBT−PTMO)-based copoly(ether ester)s is increased by replacement of PTMO soft segments with poly(ethylene oxide)- block -poly(ethylene- stat -butylene)- block -poly(ethylene oxide) (PEO- b -PEB- b -PEO) triblock copolymer soft se…
X-ray photoelectron spectroscopy (XPS), time-of-flight secondary ion mass spectrometry (ToF-SIMS), and atomic force microscopy (AFM) were used to investigate the surface composition, structure, and morphology of various poly(styrene- co-p -hexafluorohydroxyisopropyl-α-methylstyrene)/poly(4-vinylpyridine) (PS(OH)/PVPy)…
A chemical method for preparing cadmium sulfide nanocrystals over silica surfaces is reported. This is a one-step synthetic method involving the chemical degradation of alkyldithiocarbamato complexes of cadmium in the presence of submicrometric SiO 2 particles. The X-ray powder diffraction patterns of the SiO 2 @CdS n…