Materials Literature
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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…
To examine the effect of restricted porphyrin−porphyrin rotation on energy transfer in diphenylethyne-linked porphyrin arrays, a square macrocyclic array of four porphyrins has been prepared that locks the porphyrins in a mutually coplanar architecture. The palladium-mediated coupling of Zn(II) 5,10-dimesityl-15,20-bi…
Using a high resolution optical polarimeter, we have measured the temperature dependence of the birefringence and optical rotation in chiral smectic liquid crystals that exhibit antiferroelectric, ferroelectric, and intermediate phases. The temperature dependence of the magnitude of the tilt angle was determined from…
Precursors for layer‐structured perovskite thin films of SrBi 2 Ta 2 O 9 (SBT) and SrBi 2 Nb 2 O 9 (SBN) were prepared by the reactions of a strontium‐bismuth double methoxyethoxide and tantalum or niobium methoxyethoxide in methoxyethanol, followed by partial hydrolysis. Several spectroscopic techniques, such as 1 H‐…
Abstract Alpha olefin sulfonates (AOS) have been used successfully for many years in laundry and personal‐care products throughout Asia. Among their documented positive attributes are good cleaning and high foaming in both soft and hard water, rapid biodegradability, and good skin mildness. AOS has commonly been marke…
The widely differing properties of amorphous carbon films originate from the different s-p hybridization schemes possibly occurring in the C–C bond. For the study of such systems, an approach is suggested that provides direct access to these different types of s-p hybridization via a separate mapping of the s and p pa…
New measurements with a special cryostat, and a high resolution grid interferometer show that TGS exhibits Far Infrared (FIR) oscillations at θ = 5K with much smaller damping coefficients (δ = δv/v), than previously described (Gerbaux, X. and Hadni, A. (1991). Int. J. Infared and Millim. Waves, 12, 981). The values of…
We have investigated the growth of GaSe, a layered semiconductor, on single crystal Al2O3(0001)(sapphire), an ionic crystal. We have used reflection high energy electron diffraction, x-ray photoelectron spectroscopy, and transmission electron microscopy and diffraction to study the growth, interface reaction, and resu…