Materials Literature
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Effects of alloying elements on elastic moduli (Youngs moduli) of Ti-Nb-Ta-Zr system alloys for biomedical applications were investigated. In this case, Ti-30Nb-10Ta-5Zr which is the simplified chemical compositional alloy of Ti-29Nb-13Ta-4.6Zr for biomedical applications has been selected as the basic alloy composit…
We report a new class of high-dispersion immersed diffraction gratings for which the reflective nature of the diffraction is provided by the phenomenon of total internal reflection (TIR) regardless of grating tooth shape. Thus, the component can be fabricated from a single dielectric material and requires no metallic…
Abstract We investigated the crystallization growth of isotactic polypropylene under carbon dioxide (CO 2 ) at various CO 2 pressures and temperatures by in situ observation with a digital high‐fidelity microscope and a specially designed high‐pressure visualized cell. The fibrils within the spherulite were distorted…
High-resolution ac calorimetry has been carried out on dispersions of aerosils in the liquid crystal octyloxycyanobiphenyl (8OCB) as a function of aerosil concentration and temperature spanning the crystal to isotropic phases. The liquid crystal 8OCB is elastically stiffer than the previously well studied octylcyanobi…
The microstructures of copper single crystals after one equal-channel angular pass have been examined in order to clarify the mechanism of deformation in simple shear from a crystallographic aspect. The deformed microstructures were strongly influenced by the initial orientation and can be categorized into three disti…
The effect of the Coulomb correlations in diluted magnetic III-V semiconductors has been evaluated using the $\mathrm{LSDA}+\mathrm{U}$ (LSDA, local spin-density approximation) correlated band theory method. We show that Coulomb U plays an important role in determination of d-Mn states' interaction with the semiconduc…
We propose that to modify zigzag edges of nanographite structures by hydrogenation, fluorination or oxidation is a method to create magnetic materials made only from light elements. These reactions and methylene addition are compared with each other in several aspects by considering a graphene ribbon having mono-hydro…
Abstract Summary: A new strategy for bacterial polyhydroxyalkanoate (PHA) production by recombinant Ralstonia eutropha PHB − 4 harboring mutated PHA synthase genes ( phaC Ac ) from Aeromona caviae was investigated. The strain harboring wild‐type phaC Ac gene produced a PHA copolymer consisting of ( R )‐3‐hydroxybutyra…
Deformation mechanisms of Mg-Al-Zn (AZ31) alloys were investigated by performing tensile test at room temperature. In fine grain Mg alloys deformed at room temperature, nonbasal slip systems were found to be active as well as basal slip systems because of grain-boundary compatibility effect. Slip-induced grain-boundar…
This study deals with the preparation and properties of a new class of organic-inorganic hybrids from renewable resources. The hybrids were synthesized by an acid-catalyzed curing of epoxidized triglycerides in the presence of an organophilic montmorillonite (a modified clay). The mechanical properties were improved b…
Ferrocenyl macrocyclic conjugates involving 22 pi oxasmaragdyrins and 18 pi oxacorroles have been synthesized and characterized. The direct covalent linkage of the ferrocenyl moiety to the meso position of the macrocycle is achieved by simple oxidative coupling of appropriate precursors with trifluoroacetic acid as ca…
The synthesis of dendritic multichromophores based on a rigid polyphenylene scaffold is presented. Different rylene chromophores are incorporated into the core, the branches, and the surface of the dendrimer. In this way, two generations of dendritic dyads consisting of a terrylenediimide core, a stiff polyphenylene s…
Flax fibers are investigated as reinforcing agents for biodegradable polyesters (Bionolle and poly(lactic acid) plasticized with 15 wt.-% of acetyltributyl citrate, p-PLLA). The composites are obtained either by high temperature compression molding fiber mats sandwiched between polymer films, or by batch mixing fibers…
Single-chain simulations of densely branched comb polymers, or "molecular bottle-brushes" with side-chains attached to every (or every second) backbone monomer, were carried out by off-lattice Monte Carlo technique. A coarse-grained model, described by hard spheres connected by harmonic springs, was employed. Backbone…
Abstract Summary: Poly(lactic acid) polymers (PLA) are presently the most attractive compounds in the field of artificial degradable and biodegradable polymers. In order to enlarge the family, and thus the range of accessible properties, stereocopolymers and copolymers with various co‐monomers have been synthesized. H…
We present a consistent picture of the respective role of density (rho) and temperature (T) in the viscous slowing down of glassforming liquids and polymers. Specifically, based in part upon a new analysis of simulation and experimental data on liquid ortho-terphenyl, we conclude that a zeroth-order description of the…
Abstract Nanocomposites were prepared with different grades of nitrile rubber with acrylonitrile contents of 19, 34, and 50%, with styrene–butadiene rubber (23% styrene content), and with polybutadiene rubber with Na‐montmorillonite clay. The clay was modified with stearyl amine and was characterized by X‐ray diffract…
Amorphous hydrogenated silicon suboxides $(a\ensuremath{-}{\mathrm{SiO}}_{x}:\mathrm{H})$ deposited by plasma enhanced chemical vapor deposition have a band gap which can be tuned from $1.9$ to 3.0 eV by varying the oxygen content [O] from $0$ to 50 at. %. n- and p-type doping is realized by adding ${\mathrm{PH}}_{3}$…
Abstract Summary: A mixed suspension of the enantiomeric B‐A‐B triblock copolymers, polyoxyethylene‐ block ‐poly( L ‐lactide)‐ block ‐polyoxyethylene (PEG‐PLLA‐PEG) and polyoxyethylene‐ block ‐poly( D ‐lactide)‐ block ‐polyoxyethylene (PEG‐PDLA‐PEG), was found to induce reversible gel‐to‐sol transition depending on th…
Aerosol deposition method (ADM) for shock-consolidation of fine ceramics powder to form dense and hard layers is reported. Submicron ceramic particles were accelerated by gas flow in the nozzle up to velocity of several hundred m/s. During interaction with substrate, these particles formed thick (10 ~ 100 µm), dense,…