Materials Literature
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As metal oxide reduction may be a limiting or otherwise important step in a reaction cycle, a complete description of the kinetics of the reduction can be critical to the successful choice of catalytic material. Unfortunately, such information is often lacking. Such is the case in our attempts to develop a catalytic c…
Abstract Hartstoffe werden im Verschleißschutz von Werkzeugen und Bauteilen wegen ihres hohen abrasiven Verschleißwiderstands eingesetzt, meist als Beschichtung im Schichtdickenbereich von nur einigen μm. Für eine Auswahl des Schichtmaterials sind die physikalischen, mechanischen und technologischen Eigenschaften, die…
The Debye-Waller factors of atoms in Ge, GaN, ZnO, CdS, CdSe, CuBr, CuCl, AgI, CdO, AgBr, KBr and RbCl in order of Phillips ionicity ( f i ) are studied by both EXAFS and the diffraction method. The displacement correlation functions (DCF) are derived from the mean-square relative displacement (MSRD) and the mean-squa…
The Raman spectra of anatase, rutile, and brookite consist of several intense bands, whereas kaolinite has only a weak Raman spectrum. Raman spectra of ten relatively pure kaolin and two halloysite samples that varied significantly in Ti content revealed the presence of anatase but neither rutile nor brookite in all s…
In situ x‐ray diffraction has been shown to be a powerful tool for the study of the crystallographic changes that occur in a material as intercalation proceeds. Here we report the development of an in situ cell based on coin cell hardware and Bellcore plastic electrode technology. The coin cell hardware makes construc…
Abstract The Raman spectra of a tubular halloysite originating from Matauri Bay, New Zealand, have been obtained using a Renishaw 1000 Raman microscope system. The Raman microprobe enables the Raman spectra of crystals as small as 0.8 μm diameter to be obtained over the complete wavelength range and allows spectral va…
The interactions of various pyrimidines (1,3-dimethylthymine, DMT, 1,3-bis( N 4, N 4 -dimethylcytosin-1-yl)propane, DMC) and their corresponding cis - syn cyclobutane dimers (DMTD and DMCD) with a series of excited-state electron donors were examined with the goal of understanding the energetics and mechanism of UV re…
Three-dimensional solution structures for three engineered, synthetic CBDs (Y5A, Y31A, and Y32A) of cellobiohydrolase I (CBHI) from Trichoderma reesei were studied with nuclear magnetic resonance (NMR) and circular dichroism (CD) spectroscopy. According to CD measurements the antiparallel beta-sheet structure of the C…
Generations 1−5 of poly(amidoamine) (PAMAM) dendrimers were peripherally modified with cationically substituted naphthalene diimides. Reduction with sodium dithionite in water or formamide formed anion radicals on the diimide moieties. Evaporation of water under argon produced powders of the reduced dendrimers that we…
The interface between the (110) crystal face of cellulose Iβ and water was studied by molecular dynamics simulation with cellulose coordinates refined from electron diffraction data as a starting point. Potential energies, pucker parameters, torsion angles, and hydrogen bonding have been used for the characterization.…
The effect of barium (Ba) and strontium (Sr) additions on the electrical properties of lead lanthanum zirconate stannate titanate (PLZST) ceramics and their electrically induced phase change behavior was examined. Sr additions decreased both the ferroelectric (FE) ↔ antiferroelectric (AFE) transition temperature ( T A…
The influence of laser light irradiation at the surface plasmon frequency of the gold nanoparticles suspended in 2-propanol is examined by the UV−vis absorption spectral measurement and also by a transmission electron microscope. It has been found that the laser light irradiation on the colloidal suspension causes coa…
A detailed derivation of the extended Jones matrix representation for twisted nematic liquid crystal displays at oblique incidence (which was previously published by the author) is given. It is shown that this representation reduces to the well-known ordinary Jones matrix representation at normal incidence.
Using a special technique for measuring the saturation magnetization at temperatures close to the Curie point, we demonstrate that in ${\mathrm{La}}_{0.7}$${\mathrm{Sr}}_{0.3}$${\mathrm{MnO}}_{3}$ the magnetic phase transition is continuous.
A series of unsymmetric π-donor−acceptor (D/A) bis(phenylethynyl)benzenes was prepared in a two-step sequence via Pd/Cu catalyzed cross-coupling reactions of 1,4-diiodobenzene and the corresponding 4-p-R-phenylethynes. Related unsymmetric D/A platinum trans-bis(acetylide) complexes were also prepared in a stepwise fas…
The density distribution of geometrically necessary dislocations, which accompany the gradient of plastic slip strain on slip systems, is evaluated by a finite-element technique. As a numerical example, the bending of a single-crystal plate is analysed. The result obtained for the density distribution of dislocations…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTUltrathin Polymer Films near the Glass Transition: Effect on the Distribution of α-Relaxation Times As Measured by Second Harmonic GenerationDavid B. Hall, Jacob C. Hooker, and John M. TorkelsonView Author Information Department of…
A heat-labile beta-lactamase has been purified from culture supernatants of Psychrobacter immobilis A5 grown at 4 degrees C and the corresponding chromosomal ampC gene has been cloned and sequenced. All structural and kinetic properties clearly relate this enzyme to class C beta-lactamases. The kinetic parameters of P…
Abstract This study investigates the mechanical properties of wood‐fiber/toughened PP composite modified by physical blending with an EPDM rubber to improve impact toughness. Wood‐fiber thermoplastic composites were prepared with a modified PP matrix resin, employing high shear thermokinetic compounding aided with mal…
Viscosity curves were measured for polydimethyl siloxane (PDMS) melts swollen with dissolved carbon dioxide at 50 and 80°C for shear rates ranging from 40 to 2300 s−1, and for carbon dioxide contents ranging from 0 to 21 wt %. The measurements were performed with a capillary extrusion rheometer modified for sealed, hi…