Materials Literature
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We have studied the stereospecificities of various pyridoxal 5'-phosphate dependent enzymes for the hydrogen transfer between the C-4' of a bound coenzyme and the C-2 of a substrate in the transamination catalyzed by the enzymes. Prior to our studies, pyridoxal enzymes so far studied were reported to catalyze the hydr…
Magnesia-supported bimetallic Pt–Sn catalysts with various metal contents and Pt/Sn atomic ratios were prepared using the bimetallic complex cis-[PtCl(SnCl3)(PPh3)2] or the monometallic complex cis-[PtCl2(PPh3)2] and SnCl2 as metal precursors. Catalysts were characterised by X-ray diffraction, transmission electron mi…
Upon oxidative dimerization of pale yellow Ar2C=CHPh 1 (Ar = 4-Me2NC6H4), deep blue 1,4-dication 2(2+) was obtained as a stable salt, which was transformed into 1 by reductive C-C bond fission; deprotonation of 2(2+) gave intense yellow diene 3, which was interconvertible with violet dication 4(2+) by two-electron tra…
Nucleation effects of two silicate nucleating agents, attapulgite and diatomite, on the crystallization of polyoxymethylene (POM), were studied by means of differential scanning calorimetry and polarized optical microscopy. The crystallization kinetics of POM with and without nucleating agents was analyzed by means of…
The heptadentate, ‘tritopic’ ligand 2poapH2 reacts with Cu(NO3)2 in the presence of Gd(NO3)3 to give a novel, self-assembled, ferromagnetically coupled, alkoxide bridged octanuclear Cu(II) cluster in the shape of a pin-wheel, with a central Cu4[μ-O4] core, and isolated Curie-like [Gd(NO3)4(H2O)2]− anions.
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTEquilibrium Elasticity of Diblock Copolymer Micellar LatticeHiroshi Watanabe, Toshiji Kanaya, and Yoshiaki TakahashiView Author Information Institute for Chemical Research, Kyoto University, Uji, Kyoto 611, Japan; and Center for Integrated Research in Science and Engineering, N…
Compared with piezoelectric ceramics and magnetostrictive materials, the shape memory materials possess larger recoverable strain and recovery stress but slower response to external field. It is expected that the magneto shape memory materials may develop considerable strain as well as rapid and precise shape control.…
(2001). Environmental Behavior of Magnesium and Magnesium Alloysd. Materials Technology: Vol. 16, No. 2, pp. 110-126.
A prototype transformer has been designed and built which is novel in its combination of high voltage (50 kV), high frequency (20 kHz) and high power (25 kVA) specifications. The design technique utilized a spreadsheet approach which facilitated an iterative design procedure. The transformer used a ferrite core, nylon…
Abstract The oxidation of cyclohexane with molecular oxygen in the presence of isobutyraldehyde catalyzed by nanostructured iron and cobalt oxides and iron oxide supported on titania has been studied. Nanostructured cobalt oxide on MCM-41 is found to be efficient for catalytic aerobic epoxidation of olefins.
Polyaniline (PANI) films were prepared by electroless surface polymerization of the aniline on an aniline–silane (C6H5NHC3H6Si(OMe)3) modified (aniline primed) ITO electrode. Dense, smooth and strongly adhered films with thickness in the range of 100 nm to 1 µm were isolated. The polyaniline films deposited on aniline…
In this work, filter paper was coated with plasma depositions of hexamethyldisilazane (HMDS), and double layers of HMDS and n-hexane, and HMDS and tetraethyl orthosilicate (TEOS). In the case of double layers of HMDS and TEOS, TEOS deposition times of 2, 4 and 6 minutes were studied. The double layers were interfaced…
Electrochemical impedance spectroscopy was used in the study of lithium insertion in a film. Spectra obtained at different potentials showed the characteristic shape of a diffusion process, with a Warburg regime at high frequencies and a capacitive branch at low frequencies arising from the charge storage associated w…
Dihydrophilic block copolymers of poly(ethylene oxide)-b-polyglycidol were prepared and polyglycidol blocks converted into ionic blocks containing OP(O)(OH)2, COOH, or SO3H groups. Although phosphorylation of polyhydroxy compounds with POCl3 usually leads to insoluble products, phosphorylation of poly(ethylene oxid…
Several methods for the determination of both the surface free energy of polymer materials and the conditions necessary to perform contact angle measurements are discussed. The effects of the corona-treatment energy on the surface free energy and on the adhesion of acrylic adhesive were studied using a biaxially-orien…
YCo 4−x Fe x B compounds have been investigated by means of neutron powder diffraction. Substitution of Co with Fe causes substantial modifications of the crystal structure. Iron occupies preferentially one (2c) of the two cobalt sites (2c and 6i). The Curie temperature of the material increases with Fe content from T…
Using an improved pulsed electroacoustic system which is capable of measuring space charge distribution at minimum intervals of 25 /spl mu/s, the charge distribution inside water-treed polyethylene (PE) was examined. From the results, the frequency dependencies of conductivity and permittivity were examined for water…
Layered cobalt oxides and heavy-fermion compounds are quantitatively compared from the viewpoint of thermoelectric materials. These two systems exhibit anomalously large thermopowers with good electric conductivity, which is attributed to a strong electron-electron correlation. In certain materials the pseudogap incre…
The achiral syn conformer (face-to-face) of the ethane-bridged bis(zinc porphyrin) (syn-ZnD) transforms into the corresponding chiral extended anti bis-ligated species (anti-ZnD.L2) in the presence of enantiopure ligands (L: amino acid derivatives). The mechanism of the supramolecular chirality induction is based on c…
p-Type 6H-SiC substrates were implanted with Mn + or Fe + at doses of 3 5 × 10 16 cm − 2 under conditions that avoided amorphization (substrate temperature ∼350°C). After annealing at 700°C, the magnetic properties of the samples were examined by superconducting quantum interference device magnetometry. Both the Fe-…