Materials Literature
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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…
The changes in magnesium ferrite, MgFe 2 O 4, due to high-energy milling in a stainless steel vial have been investigated by Mössbauer spectroscopy, X-ray diffraction, electron microscopy, and thermal analysis. The milling process reduces the average crystallite size of MgFe 2 O 4 to the nanometer range. Prolonged mec…
An ultrathin composite film containing both polyoxometalate anion [PMo12O40]3− (PMo12) and a planar binuclear phthalocyanine, bi-CoPc, has been prepared by the electrostatic layer-by-layer self-assembly method. UV-vis measurements revealed regular film growth with each four-layer {PMo12/bi-CoPc/PSS/PAH} adsorption. Th…
This paper reports the synthesis, crystal structures, and magnetic properties of a series of lanthanide complexes with nitronyl nitroxide radicals of general formula [[Ln(III)(radical)(4)] x (ClO(4))(3) x (H(2)O)(x) x (THF)(y)] (1-4) and [Ln(III)(radical)(2)(NO(3))(3)] (5, 6) [Ln = La (compounds 1, 3, 5) or Gd (compou…
A double-chain alkyl lipid with an isoquinoline-containing headgroup was derived from l -glutamide. This worked as an organogelator in benzene, cyclohexane, a cyclohexanes−ethanol mixture, and so forth. Transmission electron microscope observation showed that the gelation was brought about through the formation of a f…
Understanding of the damping of fast magnetization precession in ferromagnetic materials is important for technological applications, in particular for the development of fast magnetic memories. We use first-principles electronic structures together with the model of ``breathing Fermi surface'' to calculate the magnet…
We report on an experimental study of adsorption isotherm of nitrogen onto porous silicon with noninterconnected pores open at one or at both ends in order to check for the first time the old (1938) but always current idea based on Cohan's description which suggests that the adsorption of gas should occur reversibly i…
Ab initio phonon calculations for the nonpolar reference structures of the (001), (110), and (111) ${\mathrm{PbZrO}}_{3}/{\mathrm{PbTiO}}_{3}$ [1:1] superlattices are presented. The unstable polar modes in the tetragonal (001) and (110) structures are confined in either the Ti- or the Zr-centered layers and display tw…
We present the first analytical study of stability loss and evolution of domain structure in inhomogeneous ferroelectric samples for exactly solvable model. The model assumes a short-circuited capacitor with two regions with slightly different critical temperatures Tc1 > Tc2, where Tc1-Tc2 << Tc1, Tc2. Even a tiny inh…
Catalysts comprising manganese-porphyrins carrying cyclodextrin binding groups are able to perform hydroxylations with substrate selectivity and regio- and stereoselectivity and high catalytic turnovers. The geometries of the catalyst/substrate complexes override intrinsic substrate reactivities, permitting attack on…
The microscopic mechanism leading to stabilization of cubic and tetragonal forms of zirconia (ZrO$_2$) is analyzed by means of a self-consistent tight-binding model. Using this model, energies and structures of zirconia containing different vacancy concentrations are calculated, equivalent in concentration to the char…