Materials Literature
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The magnetic properties of the lithium phthalocyanine radical are investigated for the x,α and β crystal structures via electron paramagnetic resonance (EPR). Different magnetic behaviours (susceptibility, line shape) are evidenced in PcLi powders and interpreted in terms of the molecular packing. A Curie–Weiss suscep…
Long lengths (>150 m) of single-mode chalcogenide optical fiber were fabricated by a double crucible technique. Single-mode transmission through 10 m of continuous fiber was demonstrated using an F-center laser at 2.7 /spl mu/m. The optical loss of this fiber was measured by a standard cutback technique using an FTIR…
Atomic force microscopy is used to characterize the nucleation and beginning growth of chromate conversion coating on polished Al 2024‐T3 alloy surfaces. Rapid nucleation occurs at different rates on the Al matrix and on two distinct intermetallic phases. One phase, assigned as a Cu‐Fe‐Mn aluminide, reaches full conve…
Reduction of an acidified solution of Na2MoO4·2H2O by iron powder results in the formation of the title compound [Mo176O16O480(OH)32(H2O)80]; the compound is tyre shaped and consists of sixteen {Mo8} subunits being linked by forty-eight MoO6 octahedra; remarkable features are the size and mass (which is of the order o…
The catalytic activity for the oxidation of isobutane catalyzed by 12-molybdophosphoric acid was much changed by the V 5+ - and Cs + -substitution for Mo 6+ and H +, respectively. The best yield of methacrylic acid was 9.0% and was obtained for the heteropoly catalyst with V and Cs contents of 1 and 2.5, respectively.…
Impressive advances have been made over the last few years in teaching silicon how to emit light. Recently, light-emitting devices (LEDs) made of porous silicon and other forms of nanoscale silicon have been demonstrated with specifications that start to make them attractive for commercial applications. This paper rev…
We investigate the equilibrium morphological properties of a symmetric ABC triblock copolymer in the strong segregation regime. Although a tricontinuous double diamond phase has been experimentally reported within a large region of the phase diagram, we find that neither gyroid nor double diamond cubic phases are stab…
The synthesis and structure of a tetranuclear copper(II) complex of a bis-N,O-bidentate Schiff base is reported; two types of copper(II) centers and the preference for two conformational degrees of freedom in the ligand lead to the unique formation of a novel supramolecular architecture not requiring a preorganized sy…
A series of ionic η5-monocyclopentadienyl–metal compounds possessing p-substituted benzonitrile ligands has been studied by hyper-Rayleigh scattering at the fundamental wavelength of 1.064 µm. Upon systematic variation of the metal ion, the first hyperpolarizability β was found to increase along the sequence Co, Ni, R…
The scope, mechanism and kinetics of the aerobic epoxidation of alkenes with an aldehyde and substituted β-diketonate–transition metal complexes as catalysts were studied. β-Diketonate complexes of nickel(II) proved to be among the best catalysts for this reaction. The epoxidation is not dependent on substrate concent…
Zinc meso-tetra(4-amidophenyl)porphyrin assembles into open two-dimensional arrays parallel to the porphyrin plane by self-complementary hydrogen bonding between the –CONH2 recognition sites of adjacent molecules; manganese meso-tetraphenylporphyrin perchlorate and the bidentate 4,4′-bipyridyl ligand afford one-dimens…
The shear strength of adhesive joints at high loading rates is evaluated with the split Hopkinson bar technique using a pin-and-collar specimen. A commercially available cyanoacrylate adhesive(commonly termed an instantaneous adhesive)and two different adherend materials are used in the tests. The impact shear strengt…
A spring loaded tactile sensor with displacement sensing has been evaluated for non-invasive assessment of physical properties, stiffness and elasticity, of human skin in vivo. The tactile sensor consists of a peizoelectric vibrator (61 kHz) with a vibration pickup, electronics and PC with software for measurement of…
The mechanism of silane thermal decomposition is investigated in a flow reactor. The time dependencies of silane consumption and disilane formation were compared with those parameters of solid product (aerosol particles) such as concentration, total hydrogen content in solid product, and fraction of hydrogen contained…
Active Matrix (AM) LCDs and STN LCDs are the leading display technologies for portable applications such as notebook computers. Recently, new LCD device configurations and new LCD operation modes have been introduced. The existing technologies and the new LCD operation modes require improved liquid crystal materials.…
Lithiation of 4,5-bis(methylsulfanyl)-TTF 9, 4,5-(ethylenedisulfanyl)-TTF 10, 4,5-dimethyl-TTF 11 and 4,5,5′-trimethyl-TTF 12 (TTF=tetrathiafulvalene) followed by reaction with methyl isothiocyanate affords the corresponding (N-methylthio-carbamoyl)-TTF derivatives 14–17, respectively, in 54–70% yields. These new TTF…
High-resolution X-ray powder diffraction using synchrotron radiation has been used to determine the unit-cell parameters of binary (n-C20H42 /n-C21H44 and n-C20H42 /n-C22H46), tertiary (n-C19H40 to n-C21H44 and n-C20H42 to n-C22H46) and quinternary (with alkanes ranging from n-C18H38 to n-C26H54) n-alkane mixed homolo…
Platinum and platinum oxide nanoparticles are deposited on electronically and ionically conducting polypyrrole/polystyrenesulfonate particles by the reduction of Pt(NH3)4Cl2 with formaldehyde and the oxidation of Na6Pt(SO3)4 with H2O2, respectively.
Formation of nanometer-sized particles in NH3/SO2/H2O/Air mixtures by α-ray irradiation was studied experimentally to evaluate the effect of NH3 gas on the gas-to-particle conversion process. The total particle number concentration, the charged-particle fraction, and the electrical mobility distribution of particles g…