Materials Literature
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Despite many years of intensive study, the natures of turnover-limiting and enantio-determining steps in catalytic asymmetric hydrogenation of prochiral enamides are poorly understood. An intriguing set of studies involving isotopic labeling distributions in catalytic enamide hydrogenation reactions were reported by B…
We are developing a novel three-dimensional (3D) microanalysis method by means of successive cross-sectional Auger mapping. In this method, a 3D elemental map will be obtained by repetition of the cross-sectioning of a sample using a gallium focused ion beam (Ga FIB) and Auger mapping of the cross section using an ele…
The importance of drying nanostructured semiconductors, such as porous silicon, in a controlled manner is explained. The mechanical instabilities that can arise during drying—resulting in cracking (see Figure) or peeling of the film—are discussed, as are methods that reduce or completely suppress these drying stresses…
The arterial wall injury associated with arterial graft implantation causes smooth muscle cells (SMCs) in the media to migrate and proliferate in the intima at the graft-artery junction resulting in anastomotic intimal hyperplasia (AIH). An important step in developing a small-diameter prosthesis may be to stimulate e…
We studied the dependence of thermodynamic variables in a sonoluminescing (SL) bubble on various physical factors, which include viscosity, thermal conductivity, surface tension, the equation of state of the gas inside the bubble, as well as the compressibility of the surrounding liquid. The numerical solutions show t…
Sintering of 0.5‐wt%‐MnO 2 ‐added Pb(Zr 0.53 Ti 0.47 )O 3 ceramics progresses at 935°C for 50 min by the addition of complex oxides of perovskite‐type crystal structure, BiFeO 3 and Ba(Cu 0.5 W 0.5 )O 3 . In order to elucidate the low‐temperature sintering mechanism of Pb(Zr,Ti)O 3 ceramics, the shrinkage and the evol…
Gradient polymers are two component polymeric systems in which the concentration of one component varies in a continuous way from one side to the other in systems with plane-parallel geometry. Such systems can be obtained from an amorphous polymeric matrix by diffusing into another monomer creating a gradient of conce…
Three series of ferroelectric liquid crystals have been synthesized, having three ester groups in the mesogenic core and one ester group in the chiral chain. The ester groups introduced into the core decrease the temperature of crystallization, which results in a broad temperature range ferroelectric smectic C phase i…
Structurally different carbon materials with an in- creasing sp 2 /sp 3 ratio were synthesized by pyrolizing cellulose materials at 400, 600, 800 and 1000 o C. The hybridization ra- tiosandtheinternalstructuresinthesesamplesweredetermined by using High Resolution Transmission Electron Microscopy, Electron Energy Loss…
We prepared luminescent silicon by incorporating H2O2 in the anodizing process. Under UV excitation, our samples appear reddish, orangish, yellowish to greenish as the electrolyte-air interface at the meniscus is approached. Under high current anodization, the emission becomes broad but unstable. The time characterist…
‘Scaled particle theory’ is applied to a two-dimensional fluid of hard ellipses. The model predicts a transition from the isotropic alignment of the ellipses to the two-dimensional nematic configuration in accordance with Monte Carlo simulations. By modifying the molecular shape it is possible to consider an ensemble…
Monte Carlo simulations are reported for the isotropic to nematic phase transition in semiflexible polymer melts. The molecules are modelled as tangent hard sphere chains with a bending energy that can be used to tune the stiffness of the chains. In the rod limit an isotropic to nematic transition occurs at high press…
Thin films of chromium cyanide Prussian blue-like materials, K n Cr x [Cr(CN) 6 ] (ca. 1.0 ± 0.5 μm thick) are electrodeposited on glassy carbon electrodes in amorphous (a) and crystalline (α) forms. The crystalline film shows a X-ray diffraction pattern typical of a face-centered cubic (fcc) Prussian blue-type cubic…
This paper describes an analytical solution to use a generic 2D finite difference method to accurately calculate the quasi 3D spatial distribution, components, and total core losses in transformer cores. The solution takes into account: (1) magnetic anisotropy and nonlinearity of the core material; (2) all components…
Measurements of recombination and accommodation coefficients of oxygen atoms are important in determining the energy released to spacecraft thermal protection during the atmospheric entry phase. The aim of this work is the evaluation of the accommodation of the energy released from oxygen atoms recombination on metals…
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…