Materials Literature
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Plasma copolymers (PCPs) of allyl alcohol/1,7-octadiene were prepared and characterized using X-ray photoelectron spectroscopy (XPS), time-of-flight secondary ion mass spectrometry (ToF-SIMS), and contact angle measurements. The use of a hydrocarbon diluent in the monomer feed allowed the deposition of films with cont…
Layered rock masses can be modelled either as standard, orthotropic continua if the layer bending can be neglected or as Cosserat continua if the influence of layer bending is essential. This paper presents a finite element smeared joint model based on the Cosserat theory. The layers are assumed to be elastic with equ…
Ceramics seldom have been used as blood-contacting materials. However, alumina ceramic (Al2O3) and polyethylene are incorporated into the pivot bearings of the Gyro centrifugal blood pump. This material combination was chosen based on the high durability of the materials. Due to the stagnant flow that often occurs in…
A new measurement method for the flexoelectric coefficients e 11 and e 33 (corresponding to the splay and bend strain, respectively) of nematic liquid crystals (LCs) is proposed. The values of e 11 + e 33 and e 11 - e 33 can be determined by fitting experimental electrooptical characteristics of hybrid aligned nematic…
A new method for solving elasticity problems of some planar quasicrystals is presented. The set of partial differential equations for the phonon and phason displacement components is reduced to a single higher-order equation by introducing a displacement function. A general solution formulation is suggested. As an exa…
We have investigated the phase behavior of a system of hard cylinders in the limit $L/\stackrel{\ensuremath{\rightarrow}}{D}0$. Simulations in this limit are possible because the model can be mapped onto a system of particles with finite volume but variable shape. Our simulations indicate that infinitely thin disks ex…
Sulfated carbohydrates may play a role in the biomineralization of the molluscan shell. The carbohydrates of the extracted water-insoluble organic shell matrix (IM) of the freshwater snail Biomphalaria glabrata were identified as glucose, mannose, galactose, and N-acetyl-glucosamine, whereas the water-soluble organic…
A retrieval technique for crystal structures using high‐resolution electron microscopy is presented. The inversion of the complex structure‐to‐image relation is performed by numerical optimization of the configuration space of object models. Unlike structure refinement in X‐ray crystallography, the method operates on…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTPhosphorus-Containing Dendrimers: Chemoselective Functionalization of Internal LayersChristophe Larré,, Bruno Donnadieu, Anne-Marie Caminade, and Jean-Pierre MajoralView Author Information Laboratoire de Chimie de Coordination du CNRS 205 route de Narbonne 31077 Toulou…
In this study, the solid residue of a RTVSR (room temperature vulcanized silicone rubber) prepared in a tracking test are analyzed. By using the techniques of KBr pellet FTIR (Fourier transformed infra-red) spectroscopy and XRD (X-ray diffractometry), cristobalite SiO/sub 2/, amorphous SiO/sub 2/, amorphous SiO/sub 2/…
The bond-order potential for hcp Ti, constructed in part I, and a central-force Finnis-Sinclair-type potential have been used to study atomistically the core structure of the ⅓ 〈1210〉 screw dislocation. The qualitative features of the core structures are similar in the two cases. The dislocation may either dissociate…
The optimization of concentrated Si 3 N 4 powder aqueous slurry properties to achieve high packing density slipcast compacts and subsequent high sintered densities was investigated. The influence of pH, sintering aid powder (6% Y 2 O 3 , 4% Al 2 O 3 ), NH 4 PA dispersant, and Si 3 N 4 oxidative thermal treatment was d…
Fine‐scale fibers with diameters <100 µm were prepared using metal alkoxide precursors. Variables that influence fiber drawing and fiber properties in the lead zirconate titanate (PZT) compositional system were investigated to obtain the processing conditions necessary to fabricate high‐quality fibers. The gel‐to‐c…
Flash cooling of macromolecular crystals was investigated by measurement of the cooling rates achieved by different cryoprotectant solutions (glycerol, sucrose and polyethylene glycol) with different sample volumes (0.2–0.8 mm3) and by different cooling agents (cold nitrogen or helium gas, liquid nitrogen and liquid p…
Abstract The effect of processing conditions (essentially the flow conditions) on the mophology of incompatible, immiscible polymer blends was investigated. In simple shear flow the steady‐state mophology, that is, droplet size, of such blends is a single‐valued finction of the shear rate whenever a critical shear rat…
Tire and waste rubber recycling is a very important issue facing the rubber industry and science community. Compounding the ground rubber tire (GRT) with commercial polyolefins is a possible and effective way of used tire recycling which can provide new rubber/plastic blends at a much lower cost. In the present study,…
Up-conversion characteristics of Er3+ under 800 nm excitation are clarified for 30SiO2 ⋅15AlO1.5⋅28PbF2⋅22CdF2⋅(5−x)GdF3⋅xErF3 (x=0.3–5) transparent glass–ceramics, which are composed of fluoride nanocrystals and oxide glass matrices. Strong up-conversion emissions at around 525, 550, and 660 nm, and weak up-conversio…
Using ultrasonic methods, we determined the ambient‐temperature elastic constants of dense (99.7%) hot‐pressed polycrystalline 3:2 mullite (3Al 2 O 3 2SiO 2 ). We report the usual polycrystal elastic constants: Young's, shear, and bulk moduli, and the Poisson's ratio (nu). The Poisson's ratio (nu = 0.280) suggests int…
Abstract For complex rocks in which the structure of minerals, rather than their chemical composition, changes with progressive evolution of the system, it makes sense to try and monitor such an evolving system through the progressive change in the crystal structures of the constituent phases. In effect, the paragenet…
Mathematical Modeling of Oxygen Exchange and Transport in Air‐Perovskite‐Yttria‐Stabilized Zirconia Interface Regions: II. Direct Exchange of Oxygen Vacancies, Svensson, Ann Mari, Sunde, Svein, Nis¸ancioǦlu, Kemal