Materials Literature
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A new organometallic “cold−slow” route to strongly fluorescing CdTe/CdS (core−shell) colloids and transparent films is presented. Based on the optical absorption, fluorescence, FTIR, micro-Raman, XPS, and XRD data collected on these nanostructures before and after thermal annealing, a mechanistic path of the core−shel…
The solubility of sodium dimethyl isophthalate-5-sulfonate in water and in a mixed solvent (water + methanol) containing sodium sulfate was determined from 292.7 K to 360.0 K. Sodium sulfate has a salting out effect on the solubility of sodium dimethyl isophthalate-5-sulfonate in water. The results were correlated by…
The orthorhombic NdMnO 3 perovskite (space group Pnma ) has been studied on the basis of magnetization and neutron powder diffraction (NPD) data. Magnetization measurements suggest the coexistence of ferromagnetic and antiferromagnetic interactions: magnetization versus magnetic field curves present a remnant magnetiz…
It is shown that oxidized La 0.5 Sr 0.5 (Mn 3+ 0.5 Mn 4+ 0.5 )O 3 and reduced Pr 0.5 Ba 0.5 Mn 3+ O 2.75 samples show similar magnetic and magnetoresistive properties. Both compounds, characterized by T C γ 320 K, exhibit a ferromagnetic-antiferromagnetic transition around 200 K, where a large magnetoresistance develo…
Magnetic anisotropy of uranium monochalcogenides, US, USe and UTe, is studied by means of fully-relativistic spin-polarized band structure calculations within the local spin-density approximation. It is found that the size of the magnetic anisotropy is fairly large (about 10 meV/unit formula), which is comparable with…
Charge-ordered phases of rare earth manganates are novel manifestations arising from interactions between the charge carriers and phonons, giving rise to the localization of carriers at specific sites in the lattice below a certain temperature. Accompanying this phenomenon, the Mn 3+ (e g ) orbitals and the associated…
Nanoparticles of gold, platinum, and silver were prepared by reduction of their metal salts with NaBH 4 in the presence of poly(amidoamine) dendrimers. The dendrimers used were generation 3, 4, and 5 having surface amino group (G3, G4, and G5) as well as generation 3.5, 4.5, and 5.5 having surface carboxyl group (G3.5…
Atomistic calculations for the 112 -generalized stacking fault (GSF) energy curve are performed for various embedded atom models of FCC metals. Models include those by Voter and Chen; Angelo, Moody and Baskes; Oh and Johnson; Mishin and Farkas; and Ercolessi and Adams. The resulting curves show similar characteristics…
This report presents the results of steady-state and time-resolved luminescence measurements performed on suspensions of nanocrystalline ZnO particles of different sizes and at different temperatures. In all cases two emission bands are observed. One is an exciton emission band and the second an intense and broad visi…
The absorption of electromagnetic waves by a high mobility two-dimensional electron gas subjected to a magnetic field and a weak periodic potential is investigated. We show that the periodic modulation on the Laudau states has a profound effect on the absorption of electromagnetic waves. We develop a formalism which t…
The potential biomedical utility of the photoinduced destabilization of liposomes depends in part on the use of green to near infrared light with its inherent therapeutic advantages. The polymerization of bilayers can be sensitized to green light by associating selected amphiphilic cyanine dyes, i.e. the cationic 1,1'…
An “inverse micellar”- or “water-in-oil”-like (similar to the lyotropic type I II ) thermotropic body-centered cubic (BCC) liquid crystal (LC) phase was discovered in a poly(ethyleneimine) with a degree of polymerization (DP) = 20 containing 3,4,5-tri(dodecyloxy)benzoyl minidendritic side groups. Fiber X-ray diffracti…
NO adsorption on metal surfaces has been studied extensively due to its important role in many catalytic processes. In the past, it was recognized that the tendency for a metal surface to dissociate NO depends on its position in the periodic table, but little was understood about the dissociation process itself. Recen…
A new experimental technique was developed to identify crack paths with a resolution of nanometres in fibre-reinforced composites. Cracks were introduced through Vickers indentations on one side of the sample prior to starting the thinning process. Indentations were placed close to the fibres in order to get enough cr…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” opt…
The polarization mechanism of strengthening was studied in thermoplastic polymers filled with ultradisperse powders of refractory SiMeON compounds obtained by plasmachemical synthesis. Thermostimulated depolarization current measurements showed the presence of spontaneous polarization charge in the filler and in fille…
A decrease in the oxygen content in Nd 0.5 Ca 0.5 MnO 3−δ down to γ≤0.12 is shown to bring about a strong decrease in the magnetic field inducing a transition from the antiferromagnetic charge-ordered to the ferromagnetic charge-disordered state. The ferromagnetic phase in a Nd 0.5 Ca 0.5 MnO 2.92 sample is stable in…
Surface-aligned photo-oxidation of CO with O2 was demonstrated on two stepped surfaces, Pt(335) and Pt(779). UV light photolysis of O2, localized exclusively on step sites, generates reactive oxygen atoms which oxidize preferentially the step-site CO. This effect was observed by monitoring labeled-CO consumption from…
Mog1p binds the Ras-family GTPase Ran/Gsp1p, which has a central role in nucleocytoplasmic transport and cell-cycle progression. Overexpression of MOG1 is able to suppress temperature-sensitive gsp1 mutants in yeast; Deltamog1 null mutants display temperature-sensitive defects in nuclear trafficking. Orthorhombic crys…
We propose a microscopic model that is capable of describing the features of both deuterated and nondeuterated betaine phosphate (BP)--betaine phosphite (BPI) solid solutions in the region of small concentration of BP. The size mismatch between the BP and BPI structural units, which leads to a drastical change of the…