Materials Literature
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Chitinous material was extracted from mycelia of Aspergillus niger and Mucor rouxii grown in yeast peptone dextrose broth for 15 and 21 days, respectively. The extracted material was characterized for purity, degree of acetylation, and crystallinity and tested for antibacterial and eliciting properties. The maximum gl…
A brief review is given of fundamental materials science concepts important for development of structural materials for fusion energy systems. Particular attention is placed on displacement damage effects associated with the unique deuterium-tritium fusion environment. Recent examples of multiscale materials modeling…
The grazing incidence small-angle X-ray scattering (GISAXS) from structures within a thin film on a substrate is generally a superposition of the two scatterings generated by the two X-ray beams (reflected and transmitted beams) converging on the film with a difference of twice the incidence angle ( α i ) of the X-ray…
Using neutron pair distribution function analysis over the temperature range from 1000 to 15 K, we demonstrate the existence of local polarization and the formation of medium-range, polar nanoregions (PNRs) with local rhombohedral order in a prototypical relaxor ferroelectric Pb(Mg(1/3)Nb(2/3))O3. We estimate the volu…
Ge – Sb – Te alloys are widely used for data recording based on the rapid and reversible amorphous-to-crystalline phase transformation that is accompanied by increases in the optical reflectivity and the electrical conductivity. However, uncertainties about the optical band gaps and electronic transport properties of…
We report the use of targeted $p$- and $n$-type chemical perturbations to manipulate high-${T}_{\mathrm{C}}$ ferromagnetism in ${\mathrm{Mn}}^{2+}\ensuremath{\mathbin:}\mathrm{ZnO}$ and ${\mathrm{Co}}^{2+}\ensuremath{\mathbin:}\mathrm{ZnO}$ in predictable and reproducible ways. We demonstrate a clear correlation betwe…
We have reported the structural, thermal, microscopic, magnetization, polarization, and dielectric properties of BiFeO3 ceramics synthesized by a rapid liquid-phase sintering technique. Optimum conditions for the synthesis of single-phase BiFeO3 ceramics were obtained. Temperature-dependent magnetization and hysteresi…
ADVERTISEMENT RETURN TO ISSUEArticleNEXTChromium− and Manganese−salen Promoted Epoxidation of AlkenesEoghan M. McGarrigle and Declan G. GilheanyView Author Information Chemistry Department, Centre for Synthesis and Chemical Biology, Conway Institute of Biomolecular and Biomedical Sciences, University College Dublin, B…
Abstract Synthesis of PEi‐g‐PA12 with concentration of PEi 2–40 wt % was fulfilled in two different ways, as ring‐opening polymerization of LL and transamidation of linear PA12 in the presence of core PEi molecules. Both methods provide almost uniform materials. Obtained samples were characterized using different tech…
Cyanid als weicher Ligand: [CrII(CN)5]3− (1) entsteht aus NEt4CN im Überschuss und (OAc)4 und wurde strukturell charakterisiert. Stöchiometrische Mengen CN− führen zur Isolierung von [(CN)9]5−. [CrII(CN)5]3− hat einen S=2-Grundzustand – ein High-Spin-Zustand eines homoleptischen Metallcyanids – und bietet sich als neu…
Equilibrium geometries, energies, and vibrational frequencies of cage-shaped boric acid clusters including the onion-like structure have been calculated at the HF/6-31G and B3LYP/6-31G(d) levels of theory. A family of cage-shaped boric acid clusters becomes evident according to our calculations. Each member of the fam…
A geometry optimization and vibrational frequency calculation has been carried out on the Fe(phen) 2 (NCS) 2 (phen = 1,10 phenantroline) molecule in both spin states ( S = 0 and S = 2) using the density functional theory (DFT) method with the B3LYP functional and the 6-31G(d) basis set. The frequency shifts upon 54 Fe…
Abstract An outline of optical spectroscopies of semiconductor surfaces based on reflectance of ultraviolet and visible light is presented. The principle of the two main differential techniques which are widely used are discussed: the surface differential reflectance spectroscopy (SDRS) gives the change of reflectance…
The study of temperature-dependent physical changes in flash-cooled macromolecular crystals is pertinent to cryocrystallography and related issues such as crystal annealing, X-ray radiation damage and kinetic crystallography. In this context, the unit-cell volume of flash-cooled trigonal and orthorhombic trypsin cryst…
Phonons in the alpha-quaterthiophene (4T) and alpha-sexithiophene (6T) polymorph phases are investigated using the direct method combined with density functional theory (DFT)-based total energy calculations. The simulation of inelastic neutron scattering spectra (INS) on the LT and HT polymorph phases of 4T and 6T ena…
Flash photolysis of nitrosyl tris(aryl)corrolate complexes of iron(III), Fe(Ar(3)C)(NO) (Ar(3)C(3-) = 5,10,15-tris(4-nitro-phenyl)corrolate (TNPC(3-)), 5,10,15-tris(phenyl)corrolate (TPC(3-)) or 5,10,15-tris(4-tolyl)corrolate (H(3)TTC(3-))) leads to NO labilization. This is followed by the rapid reaction of NO with Fe…
A novel biodegradable amphiphilic triblock copolymer bearing pendant carboxyl groups PLGG-PEG-PLGG was successfully prepared by ring-opening copolymerization of l-lactide (LA) with (3s)-benzoxylcarbonylethyl-morpholine-2, 5-dione (BEMD) in the presence of dihydroxyl poly(ethylene glycol) (PEG) as a macroinitiator in b…
Vibrational properties of surface species formed upon H2 and D2 exposure of silica supported platinum particles have been investigated with in situ diffuse reflection infrared Fourier transform spectroscopy. Experiments have been performed at 50-250 degrees C, using different platinum loading of the samples in the abs…
This study identifies the principles that govern the formation and stability of Ln complexes of the (alpha(1)-P(2)W(17)O(61))(10-) isomer. The conditional stability constants for the stepwise formation equilibria, K(1cond) and K(2cond), determined by (31)P NMR spectroscopy, show that the high log K(1cond)/log K(2cond)…
Abstract The ultrasonic degradation of poly(vinyl acetate) (PVAc) solutions was carried out in tetrahydrofuran (THF) at 20, 25, 30, and 35°C to investigate the effects of the temperature and solution concentration on the rate of degradation. The degradation kinetics were studied with viscometry. The calculated rate co…