Materials Literature
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Beneficial features of boron multiple delta doping (MDD) in synthetic diamond thin films are studied analytically and compared with MDD in GaAs. In spite of a deep boron level (∼0.3 eV), MDD greatly helps the thermal excitation of holes via elevation of the Fermi level toward the acceptor boron level. Thus, a hole exc…
Abstract Commodity linear and branched polypropylene resins have been modified by means of peroxide initiated chemical degradation in a reactive extrusion process. Data collected from molar mass and linear viscoelastic property measurements have been used to evaluate the L“crossover modulus” and “modulus separation” r…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNanocrystalline Domains of a Monoclinic Modification of Benzene Stabilized in a Crystalline Matrix of C60H. B. Buergi, R. Restori, D. Schwarzenbach, A. L. Balch, J. W. Lee, B. C. Noll, and M. M. OlmsteadCite this: Chem. Mater. 1994, 6, 8, 1325–1329Publication Date (Print):Au…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTwinned Crystals of Enantiomorphous Morphology of Racemic Alanine Induced by Optically Resolved .alpha.-Amino Acids; A Stereochemical Probe for the Early Stages of Crystal NucleationIsabelle Weissbuch, Ivan Kuzmenko, Madeleine Vaida, Sigal Zait, Leslie Leiserowitz, and Meir…
Abstract By using microporous polyacrylonitrile (PAN) hollow fibers as the substrate, we developed two types of composite fibers for air‐separation. One was a poly(4‐vinyl pyridine) (4‐PVP)/(hexafluoro propane dianhydride)–durene (6FDA)/PAN composite hollow fiber, and the other was a 6FDA–3,5‐diaminobenzonitrile/6FDA–…
Electron microprobe analysis (EMPA) of geological materials is often carried out assuming stoichiometry for one unanalyzed element to calculate matrix correction (ZAF) factors. Stoichiometric ZAF routines for multielement groups such as carbonate (CO32-) are not commonly available. Consequently, carbonates are commonl…
Anatomical properties of bamboo fiber, like chemical constituents and ultra structure establish bamboo as superior to other known natural ligno-cellulosic fibers. Bamboo fibers have been separated and sized in the form of fibers and strips. These fibers and strips mat (in the form of orthogonal mat) have been used to…
The sintering behavior and electrical conductivity of high‐purity 8‐mol% Y 2 O 3 ‐stabilized ZrO 2 (8YSZ) with Al 2 O 3 additions were investigated. The addition of 1 wt% AI 2 O 3 to 8YSZ provided dense, sintered samples with 9.1% relative density at 1400°C without a holding time. Addition of 1 wt% SiO 2 enhanced the…
A technique for the determination of the rate of corrosion is described based on the harmonic analysis of the current of the electrode perturbed with relatively small amplitude undistorted sinusoidal alternating voltage. The measurement carried out in the vicinity of the corrosion potential permits the determination o…
▪ Abstract The phase-field method has recently emerged as a powerful computational approach to modeling and predicting mesoscale morphological and microstructure evolution in materials. It describes a microstructure using a set of conserved and ...Read More
The cycloplatination of the tetrasubstituted imine 1 leads to the diplatinum organyl 3 as the main reaction product, which represents the first example of a new class of metallomesogens exhibiting monotropically a nematic‐discotic phase. An X‐ray crystal structure of this anti‐isomer 3 has been performed. Furthermore,…
We propose a mean-field lattice rate model for describing the kinetics of equilibrium as well as irradiation-induced surface segregation in concentrated alloys. The kinetics and thermodynamics are treated in a mutually consistent way. The model treats the composition field of the chemical constituents and of the point…
By using a two-roll milling method, a new bioadhesive polymer patch formulation for drug controlled delivery and consisting of Carbopol 934P (CP), polyisobutylene (PIB), and polyisoprene (PIP) was prepared. The effects of different ratios of CP:PIB:PIP on the surface properties, adhesion, and swelling of buccal patche…
Semiconducting chalcogenide glasses, AI x Te 100-x with the atomic percentage of aluminium (x) varying between 15 and 25, have been prepared by the vacuum sealed-melt quenching technique. The I-V characteristics of these samples have been measured at four different temperatures using a custom-built PC-based system. Al…
A new hydrogen sensor utilizing plasma‐enhanced chemical vapor deposited diamond in conjunction with palladium (Pd) metal has been developed. The device is fabricated in a layered Pd/undoped diamond/p‐doped diamond Schottky diode configuration. Hydrogen sensing characteristics of the device have been examined in terms…
A continuum model is used to simulate transient convective transport phenomena numerically during solidification of a Pb-19 percent Sn alloy in an experimental test cell. Solidification occurs in an axisymmetric, annular mold of stainless steel, cooled along its outer vertical wall. Results show that, during early sta…
The aggregation of polystyrene latices sterically stabilized by poly(N-isopropylacrylamide) has been studied using dynamic light scattering. The time dependence of the aggregate growth could be monitored under appropriate experimental conditions. The measured fractal dimension was found to increase with an increase in…
Moriya's perturbation theory is applied to the distorted ${\mathrm{NiO}}_{2}$ and ${\mathrm{CuO}}_{2}$ planes, and the effective spin Hamiltonians are derived. Spin-wave theory is explored for the Hamiltonians, and the spin-wave excitations are studied for nickelates and cuprates with low-temperature orthorhombic and…
The clay minerals in the < 2 µm, and finer, size fractions of several horizons from each of five Australian soils of different types and from different locations have been analysed by X-ray diffraction, infrared spectroscopy, transmission electron microscopy and X-ray fluorescence. Samples from each profile con…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe First Examples of Alkali Metal/Cu/Ce/Chalcogenides: The Layered Heterometallic Compounds KCuCe2S6 and K2Cu2CeS4Anthony C. Sutorik, Joyce Albritton-Thomas, Carl R. Kannewurf, and Mercouri G. KanatzidisCite this: J. Am. Chem. Soc. 1994, 116, 17, 7706–7713Publication Date (…