Materials Literature
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Linseed oil was employed to modify polyesteramide resin via the condensation of hydroxyethylamide derivatives of fatty acids of linseed oil, i.e. { N , N ′‐bis(2 hydroxylethyl) linseed amide} and phthalic anhydride and dicarboxylic acids such as adipic acid, succinic acid and sebacic acid. The polyesteramide resins ob…
The effect of Ta content on the mechanical properties of the quenched binary TiTa alloys with different mass percentage of Ta from 10 to 80% was investigated in order to find a Ta content that gives a good balance of low modulus and high strength for biomedical applications. The mechanical properties of binary TiTa al…
Activated carbon fibers were prepared from stabilized PAN-based fibers by chemical activation using potassium hydroxide at different concentration. The experimental data showed variations in specific surface area, microstructure by the activated carbon fibers. Specific surface area of about 2545 m2/g was obtained in t…
Grain refinement in AZ31 magnesium alloy has been attempted by hot-rolling and annealing process. Specimens were solution heat treated at 673 K for 36 ks, then hot-rolled at 423 - 773 K with total reduction of 20 - 80 % by multi pass process. The rolled specimens were annealed at 473 - 673 K for 3.6 ks. Grain sizes af…
When a material is confined in a nanometer-scale pore, novel properties not seen in a macroscopic-scale material are expected. With this situation in mind, we carry out molecular dynamics (MD) simulation for the purpose of investigating the atomic configurations of Lennard–Jones (LJ) Ar solid in a pore of 3.4 nm in di…
The hydrogen binding state in the mechanically milled graphite has been investigated by Raman scattering and infrared absorption. There is no C–H vibration signal in Raman scattering spectra, while, a C–H vibration signal has been clearly observed by infrared absorption. The dominant hydrogen configuration is C–H 2 an…
Solution-grown chain-folded lamellar single crystals of poly(tetramethylene adipate) (PTMA) were prepared from a dilute solution of 2-methyl-1-propanol by isothermal crystallization. PTMA crystals were hexagonal-shaped and polyethylene decoration of the crystals resulted in a "six cross-sector" surface morphology and…
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…