Materials Literature
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In-situ structural changes at the lamellar level during uniaxial deformation and subsequent relaxation of a semicrystalline ethylene−propylene (EP) copolymer containing 78 wt % ethylene were studied by time-resolved synchrotron small-angle X-ray scattering (SAXS) at room temperature (25 °C). During the initial stage o…
The aim of the present study is to propose a predictive model for the shear modulus versus pressure and temperature G(P,T) to complete the principal known elasto-plastic models implemented in hydrodynamic computer codes. The relevance of the proposed G(P,T) model is discussed in detail. The generic approach is to mode…
Due to continued miniaturization, the performance and reliability of electronic devices composed of multiple thin layers of material are highly dependent on effective thermal management. Since the thermal properties of thin films, such as SiO/sub 2/, can vary considerably from bulk values, the determination of those p…
Crack‐healing behavior of liquid‐phase‐sintered (LPS) SiC ceramics has been studied as functions of heat‐treatment temperature and crack size. Results showed that heat treatment in air could significantly increase the indentation strength. The heat‐treatment temperature has a profound influence on the extent of crack…
Diamond is nature’s extreme material. In addition to being the hardest and strongest known substance, diamond is also the best known thermal conductor and possesses very high electron carrier mobility and breakdown fields when in single crystal form. Diamond also exhibits exceptional optical (high refractive index, wi…
Abstract Two classes of nanocomposites were synthesized using an unsaturated polyester resin as the matrix and sodium montmorillonite as well as an organically modified montmorillonite as the reinforcing agents. X‐ray diffraction pattern of the composites showed that the interlayer spacing of the modified montmorillon…
A novel 1,2-bis(3,4-dicyanophenoxymethyl)benzene was synthesized from 1,2-bis-(hydroxymethyl)benzene and 4-nitrophthalodinitrile. Its condensation with 4-tert-butylphthalodinitrile results in a binuclear phthalocyanine of clamshell type. Reaction of bisphthalodinitrile with a large excess of zinc acetate gives rise to…
A summary is presented of what is known to date of the mechanism of dissolution of cellulose in the mixed solvent N,N-dimethyl acetamide with lithium chloride (DMAc/LiCl), including recent results from the authors laboratory as well as from other laboratories around the world. The requirements for a rigorous dissolu…
Abstract The three novel pyridine‐containing 12‐membered macrocyclic ligands 1 – 3 were synthesized. The coordinating arms are represented by three acetate moieties in 1 and 3 and by one acetate and two phosphonate moieties in 2 . In all three ligands, the acetate arm in the distal position is substituted, with a benz…
PURPOSE: To assess the potential advantages of using a 1.0 mol/L versus 0.5 mol/L gadobutrol formulation for magnetic resonance (MR) brain perfusion imaging. MATERIALS AND METHODS: Forty-three healthy volunteers were enrolled in an intraindividually controlled, randomized crossover comparison study. Two gadobutrol for…
Two genes YER081W and YIL074C, renamed SER3 and SER33, respectively, which encode phosphoglycerate dehydrogenases in Saccharomyces cerevisiae were identified. These dehydrogenases catalyze the first reaction of serine and glycine biosynthesis from the glycolytic metabolite 3-phosphoglycerate. Unlike either single muta…
Abstract Nucleophilic aromatic substitution reaction of 4‐aminophenol and also 5‐amino‐1‐naphthol with 2,6‐dichloropyridine in N‐methyl‐2‐pyrrolidone (NMP) as solvent, in the presence of potassium carbonate, afforded two aromatic ether diamines. Eight soluble, thermally stable polyamides were prepared by polycondensat…
Bragg reflections of cholesteric liquid crystals at normal and oblique incidences were investigated using the finite element method (FEM). Detailed FEM derivations together with the consideration of boundary conditions are given. Two methods for achieving broadband Bragg reflection are analysed: one is to use high bir…
Accelerator-based measurements and model calculations have been used to study the heavy-ion radiation transport properties of materials in use on the International Space Station (ISS). Samples of the ISS aluminum outer hull were augmented with various configurations of internal wall material and polyethylene. The mate…
Abstract Polyethylene terephthalate (PET) was mixed by extrusion with clay (montmorillonite) to produce nanocomposites. Additives (pentaerythrytol and maleic anhydride) were added to induce compatibility between the particles and the matrix. Thermal, mechanical and Theological properties of the nanocomposites were eva…
As a material family, pi-conjugated polymers (also known as intrinsically conductive polymers) elicit the possibility of both exploiting the chemical and physical attributes of the polymer for membrane-based separations and incorporating its electronic and electrochemical properties to enhance the separation figures-o…
A poly(9,10-anthryleneethynylene)-based polyradical with two pendant stable phenoxyls in one anthracene skeleton was newly synthesized via polymerization of the corresponding bromoethynylanthracene monomer using a Pd(0) catalyst. The average molecular weight of the polymer reached M(n) = 5 x 10(3) and was soluble in c…
Abstract A new biomimetic approach for performing CaCO 3 synthesis exclusively inside micron‐sized polyelectrolyte capsules, based on the fermentative formation of a precipitative agent (CO 3 2− anion) by urease‐catalyzed urea hydrolysis, was developed. Precipitated CaCO 3 completely fills the interior capsule volume…
Abstract 1‐Naphthol reacts with 1,1‐diarylprop‐2‐yn‐1‐ols 5a , b , under alumina catalysis, by two pathways to give the photochromic naphtho[1,2‐ b ]pyrans 6a , b , together with the propenylidenenaphthalenones 7a , b , representatives of a new class of merocyanine dyes. With 2‐methyl‐1‐naphthol, formation of the phot…
Pulsed electric current sintering (PECS) has been used to densify α‐Si 3 N 4 powder doped with oxide additives of Y 2 O 3 and Al 2 O 3 . A full density (>99%) was achieved with virtually no transformation to β‐phase, resulting in a microstructure with fine equiaxed grains. With further holding at the sintering temp…