Materials Literature
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Horizontally grown and vertically aligned carbon nitrogen (CNx) nanotubes encapsulated with Fe2O3 particles were synthesized on silicon substrates. Electron field-emission measurements were carried out on these CNx nanotubes using both the top-emission and side-emission geometries, and compared with that of the usual…
We study electromigration in copper lines encapsulated in an organosilicate glass. A line fails when a void near the upstream via grows to a critical volume. We calculate the void volume as a function of time. The statistical distribution of the critical volume (DCV) is taken to be independent of testing variables, su…
An enhanced Raman signal is observed from individual suspended single-wall carbon nanotubes (SWNTs) and from isolated SWNTs grown on an n-doped polycrystalline silicon film used in standard silicon processing. The radial breathing modes of the Raman spectra taken from suspended SWNTs exhibit narrow linewidths, which i…
Abstract The syntheses and structural characterizations of four novel lanthanide polyoxomolybdates containing the Anderson‐type anion (TeMo 6 O 24 ) 6− are presented. Depending on the size of the trivalent rare earth cations, in the solid‐state structures of {[La(H 2 O) 6 ] 2 (TeMo 6 O 24 )} n ·6 n H 2 O ( 1 ), {[Ce(H…
The inhibition of corrosion of steel in 1 M HCl solution by newly synthesised pyrazole derivatives has been studied by weight loss and polarisation techniques at 308°K. Its inhibitory power is compared to N,N′‐bis(3,5‐dimethylpyrazol‐1‐yl‐methyl)‐pentanolamine (Bipyr). The results obtained reveal that tripyrazole exhi…
Abstract The non‐catalytic hydrogenation of natural rubber (NR) and two epoxidized NRs (ENRs) i.e. ENR‐22 and ENR‐40 containing 22 and 40 mol% of epoxide, respectively, was carried out using p ‐toluenesulfonylhydrazide (TSH) as a hydrogenating agent. A two‐fold molar excess of TSH compared with unsaturated units of th…
We derive a simple equation to predict the center-wavelength shift of a Fabry-Perot type narrow-bandpass filter by using the conventional characteristic matrix method and the elastic strain model as the temperature varies. We determine the thermal expansion coefficient of substrate from the zero-shift condition of the…
Abstract In this paper we describe a new environmentally friendly method to promote the stereoselective epoxidation of Δ 4 ‐ and Δ 5 ‐steroids. Metalloporphyrins efficiently catalyze the epoxidation reactions of 17β‐acetoxy‐4‐androstene ( 1 ), 4‐cholestene ( 2 ) and 3β‐acetoxy‐5‐cholestene ( 3 ) in the presence of H 2…
Abstract The infrared and Raman spectra of propylenediammonium hexachlorostannate, NH 3 (CH 2 ) 3 NH 3 SnCl 6 , and its butylenediammonium homologue, NH 3 (CH 2 ) 4 NH 3 SnCl 6 , were recorded at ambient temperature and interpreted on the basis of literature data. All the characteristics of the IR and Raman bands of a…
Self-organized spontaneous gratings were induced on a surface of azobenzene polymer by an irradiation of frequency doubled neodymium doped yttrium–aluminum–garnet pulsed laser. Irradiation of uniform single laser beam at normal incidence induced periodic line shaped structures on a polymer surface. The structure is so…
We present a class of finite elements for capturing sub-grid localization processes such as shear bands and void sheets. The elements take the form of a double surface and deform in accordance with an arbitrary constitutive law. In particular they allow for the development of displacement and velocity jumps across vol…
Intensive studies have been carried out on controlling the periodicity and alignment of large-scale periodic arrays of carbon nanotubes (CNTs) using plasma-enhanced chemical vapor deposition. Catalytic dots are first prepared by self-assembly of polystyrene spheres on chromium-coated silicon substrates. Preparation pa…
We report true left-handed (LH) behavior in a composite metamaterial consisting of a periodically arranged split ring resonator (SRR) and wire structures. We demonstrate the magnetic resonance of the SRR structure by comparing the transmission spectra of SRRs with those of closed SRRs. We have confirmed experimentally…
We present a comprehensive set of theoretical results for differential, total, and momentum transfer cross sections and Sherman functions for the elastic scattering of electrons by barium and strontium atoms, for the entire angular range and energies below 1 keV. This study extends our method of calculations, already…
Abstract Summary: Here we report about the synthesis of colloidal particles of nematic and smectic liquid‐crystalline polymers. For this purpose mesogen‐containing acrylate monomers were synthesized and polymerized in a special modification of a precipitation polymerization called dispersion polymerization. By variati…
Abstract The synthesis and characterisation of novel liquid crystals which display columnar mesomorphism induced upon complexation of a series of nonmesomorphic hexacatenar 4,4′‐disubstituted 2,2′‐bipyridines ( L n ) are reported. The introduction of different metal centres (Zn, Pd) causes the appearance of mesomorphi…
Vertically aligned carbon nanofibers (CNFs) grown by plasma enhanced chemical vapor deposition (PECVD) were transformed into cone-shaped nanostructures after treatment by argon (Ar) plasma. Significant enhancement of field emission characteristics of the post-treated CNFs has been achieved. Analysis by electron micros…
Abstract The structural and spectroscopic characterisations of fac ‐[Re(phen)(CO) 3 Cl] ( 1 ) (phen = 1,10‐phenanthroline), fac ‐[Re(ephen)(CO) 3 Cl] ( 3 ) [ephen = 5,6‐epoxy‐1,10‐phenanthroline ( 2 )] and ephen are reported. The appearance of weak hydrogen bond networks in the crystal lattice of [Re(ephen)(CO) 3 Cl]…
We study a model colloidal system where particles interact via short-range attractive and long-range repulsive Yukawa potentials. Using the structure factor calculated from the mean-spherical approximation as the input, the kinetic phase diagrams as functions of the attraction depth and the volume fraction are obtaine…
Acetyl triethyl citrate (ATC) was used as a plasticizer for poly(lactic acid) (PLA)/starch blends coupled with maleic anhydride and an initiator of 2,5-bis(tert-butylperoxy)-2,5-dimethylhexane (L101). Elongation of the blend at break was markedly increased when the ATC content was above the 8% loading level, which is…