Materials Literature
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The optical properties of manganese‐activated zinc silicate Zn 2 ( 1 − x ) Mn 2 x SiO 4 are investigated using pulse selective photon excitation. The light response due to the 4 T 1 g ‐ 6 A 1 g transition is directly linked to the relative concentration of isolated Mn 2+ and Mn 2+ pairs in this structure. The decay cu…
Summary Predicting potential scaling problems can be difficult, and numerous saturation indices and computer algorithms have been developed to determine if, when, and where scaling will occur. The Langelier, Stiff-Davis, and the Oddo-Tomson saturation indices, all widely used in the oil field, are compared and contras…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTemperature-Responsive Interpenetrating Polymer Networks Constructed with Poly(acrylic acid) and Poly(N,N-dimethylacrylamide)Takashi Aoki, Masahiko Kawashima, Hiroki Katono, Kohei Sanui, Naoya Ogata, Teruo Okano, and Yasuhisa SakuraiCite this: Macromolecules 1994, 27, 4, 947…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic Structure Pseudopotential Calculations of Large (.apprx.1000 Atoms) Si Quantum DotsLin Wang Wang and Alex ZungerCite this: J. Phys. Chem. 1994, 98, 8, 2158–2165Publication Date (Print):February 1, 1994Publication History Published online1 May 2002Published inissue…
INTRODUCTORY REMARKS. The Origin of Surface Properties. Dynamics of Polymer Surfaces. CHARACTERIZATION METHODS. Spectroscopic Methods. Surface Energetics and Contact Angle. New and Emerging Methods. MODIFICATION TECHNIQUES. Physical Modifications. Chemical Modifications. Bulk Modifications. APPLICATIONS. Wettability.…
A new processing strategy based on atmospheric pressure sintering is presented for obtaining dense SiC‐based materials with microstructures consisting of (i) uniformly distributed elongate‐shaped α‐SiC grains and (ii) relatively high amounts (20 vol%) of second‐phase yttrium aluminum garnet (YAG). This strategy entail…
Edible composite films comprised of wheat gluten as the structural matrix and various concentrations of different lipids as the moisture barrier component were tested for water vapour permeability, dispersion in water, opacity and mechanical properties. the effects of lipids on the functional properties of gluten‐base…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation, Clathration Ability, and Catalysis of a Two-Dimensional Square Network Material Composed of Cadmium(II) and 4,4'-BipyridineMakoto Fujita, Yoon Jung Kwon, Satoru Washizu, and Katsuyuki OguraCite this: J. Am. Chem. Soc. 1994, 116, 3, 1151–1152Publication Date (Pri…
We have developed a composite vascular prosthesis with the inner blood interfacing layer made of a porous elastomeric membrane of spun Corethane fibers (10-15 microns in diameter, pore size 30-60 microns) impregnated with a gelatin-heparin complex and an outer soft tissue interfacing warp knitted Dacron sheath. Forty-…
MAxTe2 (M=Ta, Nb and A=Si, Ge) compounds show a great variety of commensurately and incommensurately modulated structures depending on the value for x. It is shown that the theory of superspace groups can be used to standardize the structures and to predict the 3D symmetry of the commensurately modulated structures. T…
Abstract The physicochemical changes of silk fibers irradiated with γ‐rays was studied in relation to the amount of absorbed does in the range 0–21 Mrad. The yellowing index ( b/L ) suddenly increased at low dose for both raw and degummed silk fibers. An equilibrium value was attained from 10 Mrad upward. The tensile…
Abstract Low‐density polyethylene (LDPE) has been investigated with respect to the diffusion of hindered phenol antioxidants added to the polymer matrix. In the study, a simple method was used to measure the diffusion coeficient, with the aid of FTIR spectroscopy without any extraction or refining steps in the analysi…
Scanning tunneling microscopy (STM) has been used to investigate the interaction of nanoscale structural elements associated with rutile ${\mathrm{TiO}}_{2}$(100)-(1\ifmmode\times\else\texttimes\fi{}3). These are the 1\ifmmode\times\else\texttimes\fi{}3 reconstruction, vicinal off-cut steps in the [001] direction, and…
Diamond homoepitaxial films were grown on an off-angle (001) substrate with a misorientation of 4.3° toward the [110] direction by microwave plasma-assisted chemical vapor deposition from a methane-hydrogen gas mixture. The single domain 2×1 surface was observed by low-energy electron diffraction (LEED) and scanning t…
Temperature-dependent conductivity and Hall measurements have been carried out on heavily in situ B-doped polycrystalline diamond films in a temperature range from ∼100 to 750 K. The slope of the conductivity is clearly non-Arrhenius leading to a pronounced tail at low temperatures. Carrier transport at low temperatur…
A full phase field model of eutectic growth is proposed, which incorporates the generic features of a eutectic phase diagram and reduces to the sharp-interface model in the appropriate limit. Large scale two-dimensional simulations are presented for the isothermal solidification of a uniformly undercooled eutectic mel…
We have measured the magnetoresistance (MR) and Hall coefficient of state-of-the-art graphite nanotubule bundles. The apparent Hall coefficient is positive in the temperature and field ranges studied. At low temperatures, the conductivity \ensuremath{\sigma} shows two dimensional weak localization behavior and the MR…
Using the Car-Parrinello method, we have obtained unforeseen structures for the low-lying isomers of ${\mathrm{Si}}_{45}$ and other midsized Si clusters. They are formed by two shells of atoms, the outer one (cage) being fullerenelike and inner one (core) consisting of a few atoms saturating dangling bonds. These nove…
We have measured the optical transmission of quasiperiodic dielectric multilayer stacks of ${\mathrm{SiO}}_{2}$ (A) and ${\mathrm{TiO}}_{2}$ (b) thin films which are ordered according to a Fibonacci sequence ${\mathit{S}}_{\mathit{j}+1}$={${\mathit{S}}_{\mathit{j}\mathrm{\ensuremath{-}}1}$}, with ${\mathit{S}}_{0}$={B…
Abstract Short branch (methyl branch) effects on the creep properties of the ultra‐high strength polyethylene fibers were investigated. The temperature and the stress dependence of creep rates of several high‐strength polyethylene fibers having different branch contents, which were prepared by blending of two polymers…