Materials Literature
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The stability of charge-orbital ordering in a colossal magnetoresistance (CMR) manganite can be varied to a large extent by doping of Cr impurities on the Mn site. Most of the generic features seen in the CMR manganites, such as the submicrometric phase separation into metallic and insulating states, a resistivity-enh…
Nanocrystal shape can have a strong influence on the 2D and 3D structure of nanocrystal (NC) arrays, and it is important to understand its role if functional magnetic nanodevices are to be realized. Here is presented a detailed TEM analysis of 11 nm Co NCs and their effect on the superlattice assembly. Twins and stack…
The past decade has seen an explosive growth in atomic-level structures determined by X-ray crystallography. Synchrotron radiation and a number of technical advances related quite directly to its development have fueled this growth. With the most recent advances coming to be used collectively and new resources being b…
The single-molecule magnets (SMMs) [Mn 4 O 3 X(OAc) 3 (dbm) 3 ] (X = Br, Cl, OAc, and F) were investigated by a detailed inelastic neutron scattering (INS) study. Up to four magnetic excitations between the zero-field split levels of the lowest S = 9 / 2 cluster ground-state have been resolved. From the determined ene…
The interfacial characteristics between amine-functionalized polystyrene/copper and between hydroxyl-functionalized polystyrene/copper were investigated by adhesion strength measurements and reflection absorption infrared (RAIR) spectroscopy. Poly(styrene-co-4-aminostyrene) (PS-NH2) and poly(styrene-co-4-hydroxystyren…
This study concerns a theoretical investigation based on the isothermal equation of state to explain the inverse Hall-Petch relationship and theoretical limit of mechanical stability of grain boundaries in the nanocrystalline metals. It is suggested that the excess free volume of the grain boundary atoms may induce a…
The absolute magnetic susceptibility as a function of temperature withdifferent amplitude and frequency of the applied field is used to characterizethe magnetic properties of high Tc – superconductors. In the present work ourdesign of a laboratory- built ac susceptometer based on the mutual inductancemethod using loca…
Enantioselective enzymatic acylation, using Lipase PS® (Pseudomonas sp., immobilized on Celite, Amano Pharmaceutical Co., Ltd.), of endo-dihalosubstituted and nonsubstituted dispiro[2.0.2.1]heptylmethanol and endo-4-methylenespiropentylmethanol provided the corresponding optically active compounds in high enantiomeric…
Dispersion polymerization of styrene (S) and vinylbenzyltrimethylammonium chloride (VBA) was conducted in an ethanol-water medium using an aromatic poly(amic acid) (PAA) as the stabilizer. When equimolar amounts of VBA and the carboxylic acid of PAA were used, monodisperse particles with high PAA content were obtained…
Dysprosium disilicate (Dy(2)Si(2)O(7)) is triclinic with a = 6.6158 (2), b = 6.6604 (2), c = 12.0551 (4) A, alpha = 94.373 (2), beta = 90.836 (2), gamma = 91.512 (2) degrees, V = 529.4 (1) A(3), space group P1;, Z = 4 and D(x) = 6.156 g cm(-3). The structure (single-crystal X-ray, R = 0.033, wR = 0.041) is built from…
Abstract X-ray diffraction analysis elucidated that a pair of hexaarylbiimidazoles was transformed to a complex composed of two lophyl radicals and a piezodimer on irradiation at low temperatures. The piezodimer, the existence of which has been assumed spectroscopically as an unstable isomer, was produced via molecula…
Drastisch weniger mehrfach oxygenierte Arene entstehen als Nebenprodukte bei der eisenkatalysierten Oxidation von Benzol zu Phenol mit H2O2 in einem MeCN/H2O-Zweiphasensystem. Mit 5-Carboxy-2-methylpyrazin-N-oxid als Eisenligand konnte dabei Benzol zu 8.6 % umgesetzt werden, wobei die Selektivität der Reaktion bezogen…
The Raman spectra of some common naturally occurring pseudo-alums, wupatkiite [CoSO4·Al2(SO4)3·22H2O], apjohnite [MnSO4·Al2(SO4)3·22H2O] and halotrichite [FeSO4·Al2(SO4)3·22H2O] were obtained at 298 and 77 K. Bands were observed at 996 and 990 cm−1 and assigned to the ν1(Ag) SO4 vibration. A band was observed at 972 c…
Heat Treatment of Gears: A Practical Guide for Engineers describes the processes and procedures used to harden alloy steel gears and explains how to optimize benefits, such as improved fatigue life, while minimizing distortion and costs. The first few chapters familiarize readers with the basic concepts of heat treati…
The genetic operon for propionic acid degradation in Salmonella enterica serovar Typhimurium contains an open reading frame designated prpE which encodes a propionyl coenzyme A (propionyl-CoA) synthetase (A. R. Horswill and J. C. Escalante-Semerena, Microbiology 145:1381-1388, 1999). In this paper we report the clonin…
The crystal structure of the two isostructural rare earth tungstates Ln 6 WO 12 ( Ln = Y , Ho ) has been refined by the Rietveld method from X-ray powder diffraction data. They crystallize with a three-dimensional rhombohedral structure (S.G. R 3¯ and Z =3 for the R -centered setting) closely related to that of the bi…
During hollow fiber spinning many variables are involved whose effects are still not completely clear. However, its understanding is of great interest because the control of these variables may originate membranes with the desired morphologies and physical properties. In this work, the phase inversion process induced…
Tradicionalmente, as embalagens para alimentos têm sido planejadas para proteger o produto; um de seus principais requisitos é a não interação com o alimento acondicionado, funcionando assim como uma barreira inerte entre o alimento e o ambiente. Entretanto, as tecnologias envolvendo embalagens ativas visam o planejam…
We report here new Ar-Ar dates for adularia, illite, and muscovite from the Twin Creeks Carlin-type deposit. All illite samples were obtained from altered intrusive and volcanic rocks that are interlayered with mineralized sedimentary rocks, thus largely avoiding complications caused by detrital illite and muscovite i…
This paper summarizes the results obtained in the MICAT project for mild steel specimens exposed for 1 to 4 years in 47 marine atmospheres in the Ibero-American region. All these atmospheres were characterized for climatology, pollution and corrosion rates according to ISO standards. Complementary morphological and ch…