Materials Literature
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Abstract The effect of heat treatment on the damping behaviour of a Cu–11.9Al–2.5Mn (wt%) alloy was investigated and correlated with the martensite microstructures. It is found that elevated quenching temperature and rapid cooling can give rise to increased damping capacity due to the formation of favourable martensit…
On the basis of HF/6-31G(d) optimized structures, the nonplanar distortions of 135 polycyclic aromatic hydrocarbons (PAHs) have been classified as splitting (S-) and arching (A-) distortions. Three bay structures are proposed as the structural origin of S-distortion. Due to the limitation of sample molecules, a set of…
Une argile naturelle, la bentonite de Maghnia (ouest d’Algérie), a été purifiée et caractérisée par calcination, pH‑métrie, IR, XRD et SEM. Les résultats obtenus ont montré que l’argile a une conductance de 66,4 µS, une capacité d’échange cationique (CEC) de 0,91 méq/g et contient 12 % de matières organiques. Les cara…
Abstract Summary: Silvered polyimide films have been fabricated by direct ion exchange of a damp‐dry poly(amic acid) film with an aqueous silver solution such as silver nitrate. Thermal curing of the silver( I )‐containing films under tension leads to cycloimidization of the poly(amic acid) into polyimide with a conco…
The surface-directed spinodal decomposition (SDSD) in binary polymer mixture with different quench depths is investigated by numerical simulations, combining Cahn−Hilliard−Cook (CHC) theory with Flory−Huggins−de Gennes theory. The formation mechanisms of the wetting layer with different quench depths are discussed. Th…
A flick of a switch: The combination of fluorinated segments and oligo(dimethylsiloxane) units with bent mesogenic cores leads to new liquid-crystalline materials (see picture) that display a temperature-dependent change from ferroelectric to antiferroelectric switching. Such materials have potential use in, for examp…
Abstract A new dinuclear metal complex including tetrathiafulvalene (TTF) radicals as ligands has been prepared and characterized, [{DMT‐TTF(CONH 2 ) 2 } 2 Cu 2 Cl 6 ] ( 1 ), DMT‐TTF(CONH 2 ) 2 = o ‐bis(amido)‐appended dimethylthio‐tetrathiafulvalene. The compound is an uncommon example in which TTF radicals directly…
Abstract Two novel isophthalic diacid‐based monomers have been synthesized by inclusion in ring position 5 of a functionalized benzoylamine moiety. The functionalization includes a 12‐crown‐4 ether group fused with the benzene subunit and a dipodand substructure, formally a disubstitution of the benzene ring, with two…
A lightweight in-plane-switching liquid crystal display (IPS-LCD) using a single glass substrate and an anisotropic polymeric film is demonstrated. The liquid crystal molecules are aligned by the elongated polymer grain of the film. The alignment capability of the anisotropic film is comparable to a buffed polyimide l…
A first-principles calculation of the structure of barium under pressure was done with a procedure which finds the equilibrium structure by minimizing the Gibbs free energy at zero temperature with respect to structure at each pressure. The calculated structures agree with measurements at the 1% level in three phases,…
To estimate the importance of relativistic effects on the reaction mechanisms between Ru and CO2, the potential energy surfaces have been performed in the triplet and quintet electronic states using quasi-relativistic (Pauli), zero-order regularly approximated (ZORA), and nonrelativistic (NR) density functional theory…
Samples of rutile TiO2 have been prepared by sintering compacted powders under argon flow. Long (above 20 h) sintering times at 1500 °C led to the formation of rods with squared cross-sections in a broad range of sizes. A two-step annealing treatment, at two temperatures, was found to favour the growth of low-dimensio…
Abstract Soluble, fluorescent, terpyridine‐substituted, conjugated polymers were prepared and characterized. The polymer chains included a defined oligo(phenylenevinylene) fragment, on which the terpyridine‐functional group was attached. The polymers were blue‐fluorescent with emission peaks at 400–427 nm in tetrahydr…
Abstract Three novel trinuclear cobalt( II ) compounds of pyridazine,[Co 3 (μ‐OH) 2 (μ‐pdz) 4 (pdz) 2 (NO 3 ) 2 (H 2 O) 2 ] · (NO 3 ) 2 · (THF) · 2(MeOH) ( 1 ), [Co 3 (μ‐OH) 2 (μ‐pdz) 4 (pdz) 4 (NO 3 ) 2 ] · [Co 3 (μ‐OH) 2 (μ‐pdz) 4 (MeOH) 4 (NO 3 ) 2 ] · (NO 3 ) 4 ( 2 ), and [Co 3 (μ‐pdz) 4 (μ‐NCS) 2 (pdz) 2 (NCS) 4…
The secondary electron emission (SEE) of ZnO-coated carbon nanotubes (CNTs) was measured using a biasing technique in a scanning electron microscope. The SEE yield of the ZnO-coated CNTs is higher than that of the ZnO film deposited on Si substrates. Direct observation of the variation in SEE from tip-end and non-CNT…
Motivated by the observation that the spontaneous polarization process of a ferroelectric polycrystal under the influence of a superimposed stress and/or electric field involves heterogeneous evolution of the ferroelectric phase among its constituent grains, a self-consistent electromechanical model is developed to de…
Abstract New cationic organoiron( II ) pyranylideneacetaldehyde hydrazone complexes were prepared in high yields through condensation reactions of the organometallic hydrazine precursor [CpFe(η 6 ‐ p ‐MeC 6 H 4 NHNH 2 )] + PF 6 – with differently substituted α‐ and γ‐pyranylideneacetaldehydes. The mononuclear hydrazon…
Uranium is the only known element that features a charge-density wave (CDW) and superconductivity. We report a comparison of the specific heat of single-crystal and polycrystalline alpha-uranium. In the single crystal we find excess contributions to the heat capacity at 41 K, 38 K, and 23 K, with a Debye temperature T…
The self-assembly of chiral depsipeptide dendrons 4, which contain a cyanuric acid building block at their focal point, with the homotritopic Hamilton receptor 1 is reported. The 1:3 compositions of the resulting chiral supramolecular dendrimers, the association constants K(n), and the cooperativity of binding express…
Boron compounds that are produced from boron ores are important industrial materials. In this report, an alternative method for the formation of boric acid obtained via the reaction between colemanite and sulfuric acid in aqueous media was studied. For this purpose, the kinetics and mechanism of the dissolution of col…