Materials Literature
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Using phase field methods, we introduce a penalty formulation for restricting the support of solutions of the hydrodynamic Poisson-Nernst-Plank equations to evolving subregions of the domain. The formulation is derived through variational principles from a free energy involving the phase field and electrostatic energy…
Yellow-emitting a-SiAlON:Eu2+ phosphors were synthesized by the gas reduction and nitridation of a homogeneous oxide precursor in a CaO–Al2O3–SiO2–Eu2O3 system at 1400–1450 °C using an NH3–CH4 mixture gas as a reduction–nitridation agent. The precursor was prepared by a sol–gel process using a low-cost nitrate, tetrae…
Shape memory properties and martensitic transformation of Ti-Nb-Pt alloys were investigated in order to develop Ni-free biomedical superelastic alloys. The effect of Pt addition on the transformation strain was investigated by measuring the lattice constants of the parent and martensite phases of Ti-Nb-Pt alloys. The…
The low-temperature transition in the Zn–Sc 1/1 cubic approximant, reported by Tamura et al. [Phys. Rev. B 71 0902203 (2005)], has been confirmed by the following experimental evidence: (1) anomaly in temperature dependence of electrical resistivity at approximately 153 K, and (2) appearance of weak superlattice refle…
Three {Ru(p-cym)}(2+) (p-cym = p-cymene) derivatives of [Nb(6)O(19)](8-)-[Nb(6)O(19){Ru(p-cym)}](6-) (Nb(6)Ru(1)), trans-[Nb(6)O(19){Ru(p-cym)}(2)](4-) (t-Nb6Ru2), and [Nb(6)O(19){Ru(p-cym)}(4)] (Nb(6)Ru(4))--have been synthesized in water by reaction between [Ru(p-cym)Cl(2)](2) and the hexaniobate. In the solid state…
The most common fabrication technique of porous silicon (PS) is electrochemical etching of a crystalline silicon wafer in a hydrofluoric (HF) acid-based solution. The electrochemical process allows for precise control of the properties of PS such as thickness of the porous layer, porosity, and average pore diameter. T…
A study of the electrical properties and spatial distribution of the ZnO:Al (AZO) thin films prepared by dc magnetron sputtering at low deposition temperature was presented, with emphasis on the origin of the resistivity inhomogeneity across the substrate. Various growth conditions were obtained by manipulating the gr…
The microdispersed sintered nanodiamonds are evaluated as a new prospective stationary phase for normal-phase high-performance liquid chromatography.
The cyclotriphosphazene P(3)N(3)Cl(6) reacts with six equivalents of DMAP (4-(dimethylamino)pyridine) in superheated chloroform to form crystals of composition [P(3)N(3)(DMAP)(6)]Cl(6).19CHCl(3) comprising [P(3)N(3)(DMAP)(6)](6+) ions, which host five chloride ions in basket-type cavities on either side of the ring an…
Two dispersion models of disordered solids, one parameterizing density of states (PDOS) and the other parameterizing joint density of states (PJDOS), are presented. Using these models, not only the complex dielectric function of the materials, but also some information about their electronic structure can be obtained.…
In this project, polyester microdenier and normal denier fibres and yarns were used to produce knitted fabrics. Microfibre fabrics showed excellent drapeability. The wicking behaviour of the microfibre fabrics was found to be better than that of the normal denier fabric. The water drop absorbency, drying rate and tota…
Morphological change of electrospun fiber with various solvent was conducted to figure out solvent effect on the surface of ethyl cellulose nanofiber. THF (bp 66 o C) and DMAc (bp 165 o C) binary solvent sys- tem was introduced and electrospinning was performed with different ratio of THF/DMAc including each pure solv…
Three water-borne polyurethane dispersions were synthesised by the pre-polymer mixing process. Different hard segment contents in the polyurethanes were obtained by varying the diisocyanate/macroglycol (NCO/OH) molar ratio. A decrease in the NCO/OH ratio produced an increase in the mean particle size and in the pre-po…
Nanoparticles of silver have been prepared by reduction of silver ions in the presence of polymer. In particular, silver nanoparticles were prepared by reduction of silver nitrate in ethanol in the presence of chemical reduction and poly [N-vinylpyrrolidone (PVP)] as a protective agent. The UV-visible spectrum of the…
An evolution has occurred with low-alloy steels and corrosion-resistant alloys to address corrosive oil and gas production needs. This evolution occurred because of the extensive laboratory and on-site testing and the significant potential for economic and fitness-for-purpose gains. These alloys have evolved with prim…
The range of composite materials, integrating insoluble organic or inorganic solids and fragments based on dendritic architecture, has been expanded considerably during the last decade. Though the dendritic parts of these hybrids often constitute only a minor portion of the total volume, these components can dramatica…
Trialkylsiloxy-modified Ta(v) centers on mesoporous silica exhibit excellent selectivity for epoxide formation (>98% after 2 h) in the oxidation of cyclohexene using aqueous H2O2 as the oxidant; the modified catalysts exhibit an increased lifetime, retaining high selectivity after 6 h of reaction (>95% epoxide).
Novel polyimide hybrid films in which nanoscale polyoxometalates (POM) clusters are covalently linked with the polymer chains exhibit not only drastically reduced dielectric constants relative to neat polyimide film, as low as 1.22, but also improved thermal stability, and mechanical properties without sacrificing the…
We describe a practical synthesis of octaalkoxycarbonyl phthalocyanines that are well soluble in various organic solvents and form liquid crystalline columnar mesophases at room temperature. The ground-state geometry, HOMO/LUMO energies, vertical transition energies and the corresponding oscillator strengths have been…
The efficacy of many drugs is improved by liposomal formulations. The greatest improvements in therapeutic benefits are achieved if the drug is retained in the liposomes for several hours after administration. Many basic drugs can be concentrated efficiently into liposomes in response to a transmembrane pH gradient. H…