Materials Literature
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A new Zn alkoxide catalyst supported by an N-heterocyclic carbene rapidly polymerizes D,L-lactide (D,L-LA) to heterotactic enriched poly(lactide)(PLA), while the free carbene and analogs instead yield highly isotactic enriched PLA.
The first Diels-Alder cycloaddition of o-quinodimethane to SWNT has been performed under microwave irradiation.
By reaction of poly(L-lactic acid) (PLLA) membrane with 1,6-hexanediamine, free amino groups were introduced onto a PLLA surface, through which biocompatible macromolecules such as gelatin, chitosan, or collagen were covalently immobilized by employing glutaraldehyde as a coupling agent. The existence of free amino gr…
Nanofibers of doped polyaniline.HCSA having diameters 1-2 nm are observed in TEM images of bath sonicated aqueous dispersions of larger nanofibers (30-50 nm diameter) synthesized by surfactant-assisted chemical oxidative polymerization of aniline in dilute aqueous organic acids.
The physical and electrochemical properties of boron-doped polycrystalline diamond thin-film electrodes, prepared with varying levels of sp 2 -bonded nondiamond carbon impurity, were systematically investigated. This impurity was introduced through adjustment of the methane-to-hydrogen (C/H) source gas ratio used for…
Organic ligand containing the imidazole [N-(3-triethoxysilylpropyl)-4,5-dihydroimidazole], precious metal-chelating functionality, was immobilized on the surface of ordered mesoporous silica, SBA-15. The resulting functionalized ordered mesoporous silica (Imi-SBA-15) was characterized and tested as an effective adsorb…
The physisorption energy of molecular hydrogen (H2) on flat carbon nanoparticles (graphitic platelets) and polycyclic aromatic hydrocarbons (PAHs) is determined to be attractive between 3.5 and 7.2 kJ mol−1, depending on the orientation of H2 and on the particle size. Entropy, estimated from experimental data, reduces…
A detailed high-resolution electron microscopy study of the formation of Ag nanowires by solvent reduction in N,N-dimethylformamide (DMF), in the presence of poly(vinylpyrrolidone) (PVP) at high temperature provided clear evidence that the nanowires grow through the oriented aggregation of precursor nanoparticles. The…
A novel cell structure for chalcogenide-based non-volatile Phase-Change Memories is presented. The new /spl mu/trench approach is fully compatible with an advanced CMOS technology, is highly manufacturable and allows to optimize array density and cell performance. Programming currents of 600 /spl mu/A, endurance of 10…
Long-chain polyamines extracted from the highly siliceous cell walls of diatoms are known to precipitate silica nanospheres from aqueous, silicic-acid containing solutions at near-neutral pH in vitro. The same is true for synthetic polyamines such as polyallylamine. In the present contribution we show that the microsc…
The oxidation of ferritic stainless steels has been studied under solid oxide fuel cell (SOFC) interconnect “dual” exposure conditions, i.e. , simultaneous exposure to air on one side of the sample, and moist hydrogen as the fuel on the other side. The scales grown on the air side under these dual exposure SOFC condit…
The size distribution and dispersion of nanomaterials, in addition to their dimensions, are crucial for their performance. Ordered mesoporous materials (OMMs), due to their periodic and size-controllable pore channels (2–10 nm) and high surface areas, have been regarded as “a natural micro-reactor” to construct novel…
A novel type of sol–gel-derived organic–inorganic molecular-based hybrid material with the two parts covalently linked together via Tb–O and Si–O bonds was synthesized. The organic component was obtained from a derivative of meta-aminobenzoic acid (MAB) which is modified by 3-(triethoxysilyl)-propyl isocyanate, and th…
The effect of heat treatment on illite in air at temperatures ranging from 750 to 1150 °C was studied using the Mössbauer effect in 57Fe. The dependence of the Mössbauer parameters and relative percentage of the radiation absorption area was measured as a function of the firing temperature. The onset of thermal struct…
The utilization of ceramic wastes with pozzolanic properties along with other compounds for obtaining new materials with cementating properties is an alternative for reducing the environmental pollution. The acceptance of these new products in the market demands minimal changes in mechanical properties according to it…
The oxygen isotope exchange of 16O by 18O in SrTiO3 causes a drastic change from paraelectric to ferroelectric, due to the suppression of quantum fluctuation. The phase transition and origin of the huge domain wall response were evaluated by dielectric, magnetic (NMR), and optical measurements (SHG, light scattering).…
The increase of the petroleum cost in the last decades revitalized the interest for lighter and more economic vehicles. Simultaneously, the demand for safe and unpolluted transports grows. The application of thermal barriers coatings (TBC) on combustion chamber and on flat surface of pistons reduces the thermal losses…
The magnetic and transport properties of the compound La0.7Sr0.3Mn1-xFe xO 3 (0.1 < x <0.4) have been studied by means of electrical resistivity, AC magnetic susceptibility, and DC magnetization. At low concentrations (x <0.1), the system displays essentially para-to-ferromagnetic transitions as the temperature is dec…
The growing popularity of wooden panels renders this market segment increasingly competitive. MDF (Medium Density Fiberboard), in particular, is widely employed for a variety of applications, including civil construction, furniture, and packaging. This paper discusses a study of MDF produced from alternative raw mater…
Results of polypropylene removal in injected metallic parts by using plasma technology are presented. The samples were injected with 55.18% Vol. of unalloyed iron powder, 23.57% Vol. of paraffin and 21.25% Vol. of polypropylene. The paraffin was previously removed in hexane bath, followed by a treatment in abnormal gl…