Materials Literature
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Static‐lattice calculations of the energies and structures of {10 1 n} (n = 0, 1, and 4) and {0001} grain boundaries in α‐AI 2 O 3 using three different potentials are reported. It was found that the energies of boundaries perpendicular to the (0001) direction vary between 0.3 and 0.9 J·m −2 . These compare favorably…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInvestigation of Polystyrene-Poly(ethylene oxide) Block Copolymer Micelle Formation in Organic and Aqueous Solutions by Nonradiative Energy Transfer ExperimentsF. Calderara, Z. Hruska, G. Hurtrez, J. P. Lerch, T. Nugay, and G. RiessCite this: Macromolecules 1994, 27, 5, 1210…
Novel abrasion-resistant coatings prepared by a sol-gel process have been developed and applied on the polymeric substrate Bisphenol A polycarbonate. In general, coatings utilize either 4,4′-diaminodiphenyl sulfone (DDS) or diethylenetriamine (DETA) that are then functionalized at their amine groups with 3-isocyanatop…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDiffusion of Dextran in Aqueous (Hydroxypropyl)celluloseZ. Bu and P. S. RussoCite this: Macromolecules 1994, 27, 5, 1187–1194Publication Date (Print):February 1, 1994Publication History Published online1 May 2002Published inissue 1 February 1994https://pubs.acs.org/doi/10.10…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA Novel Approach to the Study of Dissolution Kinetics Using the Scanning Electrochemical Microscope: Theory and Application to Copper Sulfate Pentahydrate Dissolution in Aqueous Sulfuric Acid SolutionsJulie V. Macpherson and Patrick R. UnwinCite this: J. Phys. Chem. 1994, 98…
ABSTRACT The effects of flow alignment on the relaxation dynamics of a lamellar dihlock copolymer melt and the dynamics of flow alignment itself are investigated using simultaneous measurements of shear stress and birefringence in both the flow plane and the sample plane. The primary advantage of this rhea-optical app…
We present a study of breakdown fields in BaxSr1−xTiO3 ceramics as functions of thickness, temperature, applied voltage ramp rate, electrode material and cross-sectional area. The data show evidence of Zener-like breakdown mechanisms. The d.c. leakage currents at voltages below breakdown are dominated by tunneling inj…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, Crystal Structure, and Magnetic Properties of [Ni(N3)2(2,2-Dimethylpropane-1,3-diamine)]n, an Infinite Bidimensional Antiferromagnetic Polymer Presenting Weak 3-D FerromagnetismJoan Ribas, Montserrat Monfort, Xavier Solans, and Marc DrillonCite this: Inorg. Chem.…
Ti−Ni thin films with three different compositions (Ti−48at.%Ni, Ti−50at.%Ni and Ti−51 at.%Ni) were prepared by sputtering. The sputter-deposited films were annealed at 773 K for 1 h to achieve crystallization. The stress-strain curves for the annealed films were measured over a wide temperature range (143–473 K) usin…
Abstract The Raman and infrared wavenumbers of solid HCONH 2 and DCOND 2 were measured at 20 K and high temperatures. More peaks were observed in both the lattice and internal mode regions than were expected from the known structure, so the structure was redetermined. The resulting structure is in agreement with earli…
Five cellulolytic bacterial isolates ( Clostridium and Eubacterium spp.) from a methane‐producing landfill were examined to determine their ability to utilize newspaper as a substrate for growth. Solubilization was poor with even the most actively cellulolytic bacteria. The major factor causing the low activity seemed…
A one‐end‐closed yttria‐stabilized zirconia (YSZ) tube, which is an oxygen ion conductor, was used to remove oxygen from molten copper. A thin layer of porous cermet electrode was deposited on the inner wall of the YSZ tube. The outer surface of the tube was in contact with the melt and the inner surface with a flowin…
Abstract Preparation, crystallization and melting characteristics of blends of β‐nucleated isotactic polypropylene with different elastomers and polyethylenes were studied. Blends of β‐polypropylene can be prepared if the polymer additive is amorphous or has negligible α‐nucleating effect during the crystallization of…
Isokinetic molecular-dynamics simulations have been performed for soft-sphere fluids of 4th-, 6th-, 9th-, and 12th-inverse-power potentials near the respective freezing point. We have investigated how various dynamical properties of these fluids are influenced by the softness of the potentials to which some groups of…
Molecular complexes between α‐ Keggin polyanions and tetraphenylporphyrinato Zn II that are uexpectedly stable have been obtained in the presence of an ancillary donor anion such as a halide. X‐ray structure determination reveals intgrated organic‐inorganic stacks with alkyl ammonium cations acting as spacers. Develop…
The Performance of Scale Inhibitors in the Inhibition of Iron Carbonate Scale B.G. Kriel; B.G. Kriel Arco E&P Technology Search for other works by this author on: This Site Google Scholar C.A. Lacey; C.A. Lacey Arco E&P Technology Search for other works by this author on: This Site Google Scholar R.H. Lane R.H. Lane A…
Abstract Cellulosic degradation of cotton and flax yarns caused by light, heat and heterogeneous acid‐catalyzed hydrolysis was studied. These processes were followed by measuring changes in intrinsic fluidity (1/DP w ): two principal stages, characterized by different zero‐order kinetics, take place. A relation betwee…
When designing ac insulation systems much knowledge and experience is available concerning partial discharges. However, for dc insulation there is a lack of knowledge of partial discharges and their effect on reliability and lifetime. For this reason we conducted a study on the distribution functions of the discharge…
Ideal microsensors would be cost effetive, efficient, and stable, detect low concentrations of a certain gas in a working enviornment, and be able to operate in real time, i.e., monitor continuously. Among the compounds being ivestigated for development into microsensors are the phthalocyanines (Pcs), in particular in…
We present some experiments on electrohydrodynamic convection (EHC) in nematic liquid crystals with a planar, but twisted configuration (MBBA). The threshold voltage is shown to depend only weakly on the twist angle. A theoretical analysis of the onset behaviour agrees well with the experiments. More sensitive is a se…