Materials Literature
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The chemical analysis of a laser jet was performed with a combination of laser back mass transfer and X-ray photoelectron spectroscopy (XPS). It was revealed that, as compared to the source material, films deposited from the jet under laser mass transfer in air show increased oxidizability and changed chemical composi…
A procura por novos materiais que possuam propriedades magnéticas e dielétricas adequadas ao uso em absorvedores de radiação eletromagnética é de grande importância. Dentre os materiais em estudo, os polímeros condutores têm sido aplicados como centros de absorção de radiação, devido à possibilidade de variação da sua…
Using the process of zone contraction and its inverse, zone extension, the 179372 contraction types of parallelohedra in E(5) were derived from the 84 combinatorial types of relatively or totally zone-contracted parallelohedra.
The structure of ultradisperse diamond (UDD) conglomerates was studied by scanning atomic-force microscopy (AFM). The UDD layers were prepared from a detonation carbon obtained by synthesis in an aqueous medium. The finest details in the AFM images of UDD layers are of the order of 10 nm, which does not allow individu…
Abstract A study of starved‐fed single screw extrusion was initiated to understand the relation between its distinctive melting mechanism and the improved mixing capabilities attained during compounding of a calcium carbonate filler into HDPE. Experiments were carried out in a 63.5 mm single screw extruder, examining…
An original method based on metal-free ligand and lanthanide acetate direct interaction in the presence of a strong organic base (DBU) is used to prepare sandwich-type gadolinium and ytterbium crown-ether substituted phthalocyanines bis[4,5,4′,5′,4″,5″,4‴,5‴-tetrakis(1,4,7,10,13-pentaoxatridecamethylene)phthalocyanina…
A series of syndiotactic polystyrene (sPS)/high-density polyethylene (HDPE) binary blends were prepared in the melt and then compression molded. Afterwards the blends were characterized by means of DSC, SEM and TEM microscopy, tensile tests, DMTA and acoustic measurements. The morphological, thermal and dynamic-mechan…
The structure analyses of orthorhombic lysozyme grown at pH 6.5 and its low-humidity variant are reported. The structures of the same form grown at pH 9.5 and 4.5 and that of the low-humidity variant of the pH 9.5 form are available. A comparison between them shows that the changes in molecular geometry and hydration…
Domain switching and rotation in lead titanate ceramics were evaluated by investigating the poling field dependence of the relative intensity of the X-ray diffraction (002) peak and the electrical properties. Although the lead titanate ceramic surface was highly oriented in the direction of the c -axis by the poling f…
Single crystals of the x Pb(Sc 1/2 Nb 1/2 )O 3 – y Pb(Mg 1/3 Nb 2/3 )O 3 – z PbTiO 3 (PSMNT 100 x /100 y /100 z ) ternary system have successfully been grown by a flux method using 71.4 mol% PbO–28.6 mol% B 2 O 3 flux. The crystals were grown in a platinum crucible by mass crystallization achieved by the slow cooling…
The structural and magnetic properties of the Dy2Fe17Hx compounds, where x is 0, 1, 2, 3, and 3.8, have been investigated by means of powder x-ray diffraction, thermomagnetic and ac magnetic susceptibility measurements, and iron-57 Mössbauer spectroscopy. The Dy2Fe17Hx compounds crystallize in a hexagonal Th2Ni17 -lik…
Abstract New spin-crossover Iron(III) complexes [Fe(salten)(trans-stpy)]BPh4·(CH3)2CO·0.5H2O 1 and [Fe(salten)(cis-stpy)]BPh42 with cis-trans photoisomerizable ligands have been synthesized and characterized, where trans-stpy is trans-4-styrylpyridine and cis-stpy cis-4-styrylpyridine, and salten denotes bis(3-salicyl…
We have performed measurements of the spatial distribution of current in various alkali and reactive ion beams over the energy range 5–600 eV using a Faraday cup. Ion beam current densities have been extracted from these measurements using a simple deconvolution procedure. Our results reveal that the beams are Gaussia…
Effect of the soft-segment structure and molecular weight on the microphase separation in segmented polyurethanes (SPU) was determined by means of differential scanning calorimetry, small-angle X-ray scattering, dielectric constant measurement, pulsed nuclear magnetic resonance, and thermoluminescence. Possible change…
The publications on low-molecular thermotropic liquid crystals with cholesteric structures have been reviewed. The effect of an applied electric field on cholesteric structures is studied. Bistability of the cholesteric-nematic transition, electric field-induced color textures of cholesteric mixtures, and electro-opti…
Two putative Methanococcus jannaschii isocitrate dehydrogenase genes, MJ1596 and MJ0720, were cloned and overexpressed in Escherichia coli, and their gene products were tested for the ability to catalyze the NAD- and NADP-dependent oxidative decarboxylation of DL-threo-3-isopropylmalic acid, threo-isocitrate, erythro-…
The compositional design of Pb(Zr, Ti)O 3 –Pb(Ni, Nb)O 3 ceramics to lower the sintering temperature and improve their piezoelectric properties was investigated. The nonstoichiometric composition containing excess NiO or PbO and NiO can be densified at 800°C. The excess NiO composition can be fabricated in the firing…
Broken-symmetry density functional theory shows that there is no intrinsic link between the change in structure and the change in spin state shown by [(Cp*RuCl)2(μ-Cl)2]. The bistability observed in this complex should therefore be regarded as an example of bond-stretch isomerism, rather than spin-state isomerism [Eq.…
Phosphorus (P) forms in soils determine the amount of P available for crops and the potential for this element to be released to water. Sequential chemical fractionation can provide some information about major P forms in soils, and allow one to distinguish iron (Fe)‐related phosphorus from calcium (Ca)‐bound P. The 3…
The electronic structure of ${\mathrm{La}}_{7/8}{\mathrm{Sr}}_{1/8}{\mathrm{MnO}}_{3}$ was studied by using the rotation-invariant LSDA (local spin density approximation)+U formalism. We found the specific kind of charge and orbital order for ferromagnetic insulating solution in a $2a\ifmmode\times\else\texttimes\fi{}…