Materials Literature
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Bis[ p -(1-oxyl-3-oxide-4,4,5,5-tetramethylimidazolin-2-yl)phenyl] nitroxide ( 3 ) was synthesized via desilylation of O -protected diradical followed by autoxidation. By deoxgenation of 3, p -(1-oxyl-4,4,5,5-tetramethylimidazolin-2-yl)phenyl- p -(1-oxyl-3-oxide-4,4,5,5-tetramethylimidazolin-2-yl)phenyl nitroxide ( 4…
The evolution of polymolecular micelles formed by two different poly(2-vinylpyridine)-polystyrene (PVP-PS) block copolymers dissolved in toluene is studied by means of transmission electron microscopy (TEM). The two PVP-PS diblock copolymers differ in composition, namely in the length of PVP block. Upon dissolution, a…
A detailed study has been undertaken on crack healing at high temperatures in a silicon nitride containing 10 wt% additives in order to identify the dominant mechanism responsible for the phenomenon. Fracture toughness increased with annealing time and the crack growth rate decreased until arrest with increasing testi…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTDirect Electrochemistry of Cofactor Redox Sites in a Bacterial Photosynthetic Reaction Center ProteinJilie Kong, Zhongqing Lu, Yuri M. Lvov, Ruel Z. B. Desamero, Harry A. Frank, and James F. RuslingView Author Information Department of Chemistry, University of Connecti…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTUnusual Conformational Change of Optically Active Poly(3-((S)-sec-butoxycarbonyl)phenyl isocyanate)Katsuhiro Maeda and Yoshio OkamotoView Author Information Department of Applied Chemistry, Graduate School of Engineering, Nagoya Uni…
Isolated clusters of Pb94- with the shape of monocapped square antiprisms are found in Cs4Pb9 made by direct fusion of the elements. A “close-packed” layer of clusters viewed along c of the monoclinic cell is shown to the right (b is vertical).
We present epitaxial growth, structures, magnetization, magneto-transport, and magneto-optic properties of (GaMn)As thin films and (GaMn)As/AlAs superlattice heterostructures grown by molecular beam epitaxy (MBE) on GaAs substrates. (Ga1−xMnx)As is a new class of III–V based magnetic alloy semiconductor grown by low t…
n-Hexane conversion over zeolite-supported platinum catalysts has been studied at 360°C in a packed bed reactor. In the absence of sulfur impurities, the deactivation appears to be due to two types of coke formation. The propensity for terminal hydrogenolysis is primarily determined by the particle morphology, i.e., t…
A solidification front advancing into a three-dimensional (3D) medium containing mobile impurities is implemented as a model for a semilate stage dynamical process at a first-order phase transition under the isothermal undercooling condition. The approach generalizes the dynamical epidemic model to 3D. The presence of…
Impacts of rigid spherical nose shaped missiles on concrete beams are simulated with a discrete element method. The history of the structural damage of the beam is followed from the very first crushing and fracturing processes to the ultimate fragmentation step. Spalling, scabbing, penetration and perforation events a…
The properties of zirconia cubic solid solutions doped with yttria, erbia, and ceria or thoria are investigated with emphasis on the potential use of this material as an inert matrix for Pu incineration in a light water reactor. The material is selected on the basis of its neutronic and chemical properties; Zr and Y a…
A variable duty cycle pulsed plasma was employed to synthesize polymeric films from pentafluorostyrene monomer. The physical properties of the resultant films are observed to vary in progressive fashion with changes in the plasma duty cycles employed during deposition, all other plasma variables remaining constant. Th…
We report the observation of new pattern formation by spherical polystyrene particles trapped at the air-water interface; namely, the formation of two-dimensional void, soap-froth, and cluster structures. The formation of the soap-froth structure depends upon the initial surface concentration of particles. The void an…
The effect of magnetic fields on the orientation and properties of 4,4'-bis(2,3-epoxypropoxy)-alpha-methylstilbene cured with sulfanilamide has been studied. This epoxy system is initially isotropic and forms a smectic A phase upon curing. A magnetic field was applied during the cure reaction, resulting in alignment o…
Although cryogenic data collection has become the method of choice for macromolecular crystallography, the flash-cooling step can dramatically increase the mosaicity of some crystals. Macromolecular crystal annealing significantly reduces the mosaicity of flash-cooled crystals without affecting molecular structure. Th…
A systematic set of samples with compositions in the Ca alpha‐SiAlON (α′) system has been fabricated using pressureless sintering to evaluate the phase relationships on, and near, the Ca α′ plane. A phase behavioral diagram for the Ca α′ plane within the Jänecke prism has been determined and found to be similar to tho…
The determination of the nuclear magnetic resonance (NMR) solution structure of fully reduced human glutaredoxin is described. A total of 1159 useful nuclear Overhauser effect (NOE) upper distance constraints and 187 dihedral angle constraints were obtained as the input for the structure calculations for which the tor…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTSurface Relaxation Process of Monodisperse Polystyrene Film Based on Lateral Force Microscopic MeasurementsTisato Kajiyama, Keiji Tanaka, Noriaki Satomi, and Atsushi TakaharaView Author Information Department of Materials Physics &…
Two novel polynuclear manganese(II,III) complexes have been synthesized by exploiting controlled methanolysis. A one-pot reaction of MnCl(2), NaOMe, dibenzoylmethane (Hdbm), and O(2) in anhydrous methanol, followed by recrystallization from MeOH/CHCl(3) mixtures, afforded the alkoxomanganese complexes [Mn(7)(OMe)(12)(…
The low-frequency dynamics of different solid phases of ethanol (fully ordered crystal, orientational glass, and true structural glass) is investigated by measurements of low-temperature specific heat as well as determination of the vibrational densities of states by inelastic neutron scattering. Such polymorphism pro…