Materials Literature
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A novel compound of the formula Ag2·CA (CA = cyanuric acid) possessing Ag sheets and hydrogen-bonded CA chains, exhibits anisotropic conductivity and acts as an infinite parallel plate capacitor with a high dielectric constant.
Abstract The so-called ``α-oxygen" on Fe-ZSM-5 zeolite, a surface oxygen species responsible for high reactivity in oxidation of methane and of benzene, has been investigated. We present from density-functional-theory (DFT) calculations how such a reactive surface species is generated upon decomposition of dinitrogen…
We covalently immobilized poly(ethylene oxide) (PEO) chains onto a fluorinated ethylene propylene copolymer (FEP) surface. On the FEP surface, aldehyde groups were first deposited by plasma polymerization of acetaldehyde or acrolein. Then, amino-PEO chains were immobilized through Schiff base formation, which was foll…
The layered double hydroxide (LDH) of Mg with Al decomposes at 450 °C to yield a mixed metal oxide. The oxide reconstructs back to the parent LDH either on cooling in air or soaking in water. This reversible thermal behaviour was attributed to the formation of an unstable defect rocksalt phase (comprising Al3+ ions pa…
A novel polyimide (PI)/clay hybrid nanocomposite, designated as PI (PAAS)/CM, has been developed from the poly(amic acid) salt of triethylamine and organomontmorillonite (CM) using a mixture solution of tetrahydrofuran (THF) and methanol (MeOH). For comparison, two other PI/clay hybrids derived from poly(amic acid) an…
The polymerization of aniline (ANI) in aqueous medium in the presence of (NH4)2S2O8 and montmorillonite (MMT) resulted in the formation of a nanocomposite (PANI–MMT). The inclusion of PANI in the composite was confirmed by FTIR studies. The extent of PANI loading in the composite increased with ANI concentration at a…
Reaction of Ln(ClO4)3 (Ln=Nd or Gd) with L-serine at pH 6.0 yielded the aqua hexanuclear clusters [Nd6(μ6-O)(μ3-OH)8(H2O)24](ClO4)8·6 H2O (1) and [Gd6(μ6-O)(μ3-OH)8(H2O)24](ClO4)8·6 H2O (2). They are isomorphous and comprised of a regular octahedron of 6 lanthanide ions encapsulating a μ6-O2− anion and capped by a μ3-…
A picture for thermodynamics of the glassy state was introduced recently by us [Phys. Rev. Lett. 79, 1317 (1997); 80, 5580 (1998)]. It starts by assuming that one extra parameter, the effective temperature, is needed to describe the glassy state. This approach connects responses of macroscopic observables to a field c…
The ruthenium pyrochlores, , and ruthenium perovskites, were characterized as new electrode materials for solid oxide fuel cells. The electrical conductivity, cathodic polarization, thermal expansion, and reactivity with yttria‐stabilized zirconia were examined. The pyrochlores showed low cathodic overpotential even a…
Sandvik Bioline High‐N and 316 LVM are two austenitic stainless steels especially developed for biomaterial applications. Their resistance to localized corrosion was investigated by electrochemical methods including cyclic potentiodynamic polarization and potentiostatic polarization measurements in a phosphate‐buffere…
A novel family of photochromic amorphous molecular materials based on dithienylethene, 1-(5-{4-[bis(4-methylphenyl)amino]phenyl}-2-methylthiophen-3-yl)-2-(2-methylbenzo[b]thiophen-3-yl)-3,3,4,4,5,5-hexafluorocyclopentene (1o) and 1,2-bis(5-{4-[bis(4-methylphenyl)amino]phenyl}-2-methylthiophen-3-yl)-3,3,4,4,5,5-hexaflu…
Integral membrane proteins carry out some of the most important functions of living cells, yet relatively few details are known about their structures. This is due, in large part, to the difficulties associated with preparing membrane protein crystals suitable for X-ray diffraction analysis. Mechanistic studies of mem…
Electrochemical copolymerization of diphenylamine (DPA) with aniline (ANI) has been carried out in aqueous sulfuric acid medium using a pulse potentiostic method (PPSM). The polymeric films were electrodeposited by employing different tunable parameters like pulse width ( P w ) , pulse number ( P n ) etc., and the fil…
The detection of specific sequences of DNA bases in a single strand can be achieved by hybridization of a known sequence of synthetic DNA. Due to the low concentrations usually used, a fluorescent label is required to detect the probe. Surface enhanced resonance Raman scattering (SERRS) also has the required sensitivi…
The effect of surface chemistry on the proliferation and adhesion of SV-40 human corneal epithelial cells was investigated. The surface chemistry of substrates was controlled by the deposition of self-assembled monolayers (SAMs) terminated with the following functional groups: -CF3, -CH3, -CO(2)H, and -NH(2). SAMs of…
This paper describes a new amorphous wide-band gap semiconductor with photoluminescence (PL) at room temperature. The amorphous PbTiO3 was prepared by a sol–gel-like process in powder and thin film form. The optical property and the PL behaviour showed a direct relation to the amorphous structure. The PL peak energy c…
The ternary compound Ti3SiC2 possesses an unusual combination of metallic and ceramic properties, such as, high electrical conductivity, good oxidation resistance and remarkable refractoriness. Stoichiometric mixtures of the elemental Ti, Si and C powders were heated under various conditions and the reactions among th…
Reactions of 2,6-diphenylphenol (HOdpp) and rare earth metals, in the presence of mercury, at elevated temperatures in sealed tubes followed by extraction with toluene yielded homoleptic tris(aryloxo)lanthanoid(III) complexes, [Ln(Odpp)3] (Ln = Y (1), La (2), Ce (3), Pr (4), Nd (5), Gd (6), Ho (7), Er (8), Lu (9)). Si…
Metal capped carbon nanotubes, prepared by catalytic decomposition of benzene, have been applied as a magnetic force microscope tip. The particles at the end of nanotubes were about 35 nm in diameter, which were found to be Ni3C from the electron diffraction pattern. The other end of the nanotubes was attached on the…
In acetone and at ambient temperature, the dinuclear manganese complex of TPTN is able to catalyse the oxidation of several alkenes to the corresponding epoxides with high turnovers numbers (up to 900) using H2O2 as oxidant.