Materials Literature
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Abstract This paper reviews recent studies conducted on carbon nanotube/polymer composites. Carbon nanotubes are promising new materials for blending with polymers with potential to obtain low‐weight nanocomposites of extraordinary mechanical, electrical, thermal and multifunctional properties. The size scale, aspect…
Offering the advantages of lightweight and high specific strength, magnesium (Mg) alloys are extensively used in the manufacture of automotive parts and light-gauge box-type products, such as laptop computers, mobile phones, etc, which are expected to see lighter-weight applications in future. Presently available Mg a…
Applying the path integral formalism we study the equilibrium thermodynamics of the phonon field both in the Holstein and in the Su-Schrieffer-Heeger models. The anharmonic cumulant series, dependent on the peculiar source currents of the e-ph models, have been computed versus temperature in the case of a low energy o…
There has not been a nuclear power plant licensed since 1979 due to the radioactive releases at the Three Mile Island nuclear power plant and an accident at Chernobyl. The public and federal government opinion regarding nuclear power has since changed because the nuclear power plants are operating with unprecedented r…
Single crystals of ZnB2O4 have been grown from a supercooled molten ZnO-B2O3 system on multiwall carbon nanotubes. Transmission electron microscopy investigations indicated that the originally curly carbon nanotubes were well straightened after the single-crystal coating. The coating and straightening mechanism are di…
Abstract A one‐step preparation of several flavylium salts containing alkyl side chains in their 3‐, 4′‐, 5‐ or 6‐positions is described. Flavylium salts with alkyl side chains in positions 3 or 4′ were isolated from reactions between 2,4‐dihydroxybenzaldehyde and decanophenone, dodecanophenone and 4′‐hexyl‐ or 4′‐dod…
The structural and dynamic properties of water between brucite (0001), talc (001), and halite (100) surfaces have been calculated by classical molecular dynamics (MD) simulations at ambient conditions. The interaction potential models between water and the minerals have been developed by the energy curves obtained fro…
We have epitaxially deposited Ba0.6Sr0.4TiO3 (BST) thin films on SiO2∕Si substrates using pulsed laser deposition by introducing biaxially oriented ion-beam-assisted-deposited MgO as templates. The structural properties of the BST films were strongly affected by the crystallinity of the templates. The dielectric loss…
A new Aurivillius phase (generic formula M2An−1BnO3n+3) has been synthesized with n = 3 and containing manganese, Bi2Sr1.4La0.6Nb2MnO12. The structure has been investigated by X-ray and neutron powder diffraction and found to be tetragonal (I4/mmm) at temperatures down to 2 K, with a = 3.89970(7) Å, c = 32.8073(9) Å a…
Our Raman study of 0–6mol% Bi excess Bi4Ti3O12 (BIT) films implies that symmetry breaking effect occurs in 0mol% Bi excess film, which is restored to BIT symmetry in 2–6mol% Bi excess films. The “rigid layer” mode at 59.22cm−1 implies a higher stability of Bi in the Bi2O2 layer than the perovskite layer and that Bi ha…
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…