Materials Literature
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Silk fibroin hydrogels prepared either by treating a 2% (w/v) silk fibroin aqeuous solution at 4 degrees C (thermgel) or by adding 30% (v/v) of glycerol (glygel), were characterized by using Environmental Scanning Electron Microscopy (ESEM), Fourier Transform Infrared Spectroscopy (FT-IR), Differential Scanning Calori…
Detailed chemical and surface structure analyses are presented for an 8 mol % yttria-stabilized zirconia (YSZ) wafer, partially covered with a thin, porous (LSM) film electrode, after being cathodically poisoned in the presence of a chromia source at 800°C. Under the conditions used, the newly deposited Cr-containing…
Research Article| November 01, 2004 Effect of ambient Mg/Ca ratio on Mg fractionation in calcareous marine invertebrates: A record of the oceanic Mg/Ca ratio over the Phanerozoic Justin B. Ries Justin B. Ries 1Morton K. Blaustein Department of Earth and Planetary Sciences, Johns Hopkins University, Baltimore, Maryland…
In order to understand the role that proteins play in the generation of well regulated biosilica structures we need to understand the contribution of the components, singly and in combination. To this end we have performed a systematic study of the effect of amino acids and small peptide oligomers on silica formation…
Transmission of polarized light through sub-wavelength slit apertures is studied based on the electromagnetic field distributions obtained in computer simulations. The results show the existence of a cutoff for E|| and a strong transmission (with no cutoff) for E?; here || and ? refer to the direction of the incident…
The self-ordering behavior of porous anodic alumina induced by the burning phenomenon on the specimen where extremely high and local current concentrations occurred was studied. The domains of highly self-ordered cell arrangement were found at the locally thickened film formed by burning. At the center of the burnt ar…
The mechanism of trench formation next to cathodic intermetallic compound particles (IMC) on bare polished AA 2024-T3 was studied in situ using confocal laser scanning microscopy. Trenches formed at the interface between the matrix and some IMC of the Al-Cu-Mn-Fe and Al-Cu types in all electrolyte solutions studied, i…
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…