Materials Literature
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A new nanocomposite based on polyaniline and MoO3 is prepared via direct intercalation of conducting polymer macromolecules. The method of preparation allows material to be obtained with peculiar electric and electronic properties.
We perform first-principles pseudopotential calculations to investigate the oxidation process by oxygen gas exposure in single-wall carbon nanotubes with a closed tip. Oxygen molecules can be initially adsorbed either on the tube cap or wall, keeping their molecular form, then, a successive transformation occurs into…
Hydrogenated amorphous carbon films were fabricated with and without hydrogen dilution in a small d.c bias-assisted plasma chemical vapor deposition system. It was found that the hydrogen dilution can reduce the sp 2 / sp 3 ratio in carbon films which results in blue shift of room temperature photoluminescence spectru…
In this paper ternary compounds ${\mathrm{GdFe}}_{12\ensuremath{-}x}{\mathrm{Re}}_{x}$ with x ranging from 1.0 to 2.4 have been synthesized and investigated by means of x-ray powder diffraction (XRD) and magnetic measurements. The compounds crystallize in the tetragonal ${\mathrm{ThMn}}_{12}$ structure with space grou…
The crystalline trinuclear cerium cluster complex [{(Ce(OBut)2}2(μ-OBut)3(μ3-OBut)2{Ce(OBut)(NO3)}] 1 has been obtained in good yield from 2 [Ce(OBut)4(thf)2], [Ce(OBut)3(NO3)] and Sn(C5H3But2-1,3)Me3 by refluxing in hexane, and was characterised by microanalysis, 1H NMR, IR and UV–Vis spectra and MS data. Its structu…
This paper describes the efficient synthesis and full characterization of rare formally zerovalent and diamagnetic monovalent pseudooctahedral niobium and tantalum complexes. The reaction of NbCl(4)(thf)(2) with 4 equiv of Na and 3.5 equiv of iPr(2)-dad (1,4-diisopropyl-1,4-diaza-1,3-diene) yields Nb(iPr(2)-dad)(3) in…
The miscibility behavior and specific interaction of phenolic resin with poly(acetoxystyrene) (PAS) blends were examined using differential scanning calorimetry (DSC), fourier-transform infrared (FT-IR) spectroscopy and solid-state NMR. This phenolic/PAS blend is fully miscible, as indicated by a single glass-transiti…
The curvature of an emulsion of CO 2 and brine stabilized with a triblock copolymer of poly(dimethylsiloxane) (PDMS) and poly(ethylene oxide) (PEO), PEO- b -PDMS- b -PEO, was inverted from H 2 O-in-CO 2 to CO 2 -in-H 2 O (C/W) by reducing the temperature. A “v-shaped” trough was observed in the interfacial tension bet…
Polyoxometalate (POM) clusters derivatized with aniline groups exhibit distinct interactions with counterions and with each other. These interactions lead to the assembly of the clusters into chains and networks upon crystallization. Two cluster types were examined, [W(6)O(25)H(AsC(6)H(4)-4-NH(2))(2)](5-) and [Mo(12)O…
Two new nonanuclear lanthanide(III)-copper(II) complexes of macrocyclic oxamide [NaPr(2)(CuL)(6)(H(2)O)(6)](ClO(4))(6)Cl small middle dot6H(2)O (1) and [NaNd(2)(CuL)(6)(H(2)O)(6)](ClO(4))(6)Cl small middle dot8H(2)O (2) have been synthesized and characterized by means of elemental analysis, IR, and electronic spectra,…
Abstract Tensile drawing and short‐term creep of ethylene/α‐olefin copolymers having bimodal (BM) molar weight distribution are studied in comparison with unimodal (UM) copolymers of similar crystallinity. The natural draw ratio and viscoelastic recovery upon unloading strongly suggest that BM copolymers have more tie…
Six cubane-type complexes comprising similar [M4O4]n+ cores [M = Mn(II), Co(II), Ni(II), Zn(II) or Cd(II)] synthesised in a facile route utilizing the gem-diol form of di-2-pyridyl ketone as a ligand have been characterised by X-ray structural analysis. Complex 1 crystallizes in the cubic space group I 3d, which is th…
The total vapor pressures of NdCl 3, NdBr 3, and NdI 3 were measured by the torsion effusion method. By a least-squares treatment of the experimental data, the following equations were selected as representative for the temperature dependence of their vapor pressures in the covered temperature ranges: NdCl 3 (s), log(…
An in situ silanization reaction on the surface of freshly prepared porous silicon (PS) has been achieved at room temperature with a trace of amine as the catalyst. Infrared absorption spectra (FTIR) and X-ray photoelectron spectroscopy measurements show that the silanes are successfully attached to the surface of the…
Nitrogen physisorption measurements of silicon nitride materials obtained from silicon diimide show the valuable porosity of these compounds in the mesopore regime and very high specific surface areas up to 1000 m2 g−1, suitable for catalytic applications. The pore size of the solids is effectively tailored by the var…
Abstract A poly(amic acid) was prepared by the reaction of 3,3′‐dihydroxybenzidine and pyromellitic dianhydride in N,N ‐dimethylacetamide. Hexadecylamine was used as an organophilic alkylamine in organoclay. Cast films were obtained from blend solutions of the precursor polymer and the organoclay. The cast film was he…
The potential of chitosan as an emulsion stabilizer is combined with the miniemulsion technique to generate oil droplets, hollow capsules, and latex particles in the diameter range of 100-300 nm carrying a functional biopolymer surface. It turned out that chitosan alone, independent of its molecular weight, is just mo…
Monodisperse lead selenide nanoparticles have been successfully prepared via a sonochemical route from an aqueous solution of lead acetate and sodium selenosulfate in the presence of complexing agents under ambient air. It was found that when trisodium citrate was used as the complexing agent, the product was spherica…
Au nanoparticles supported over Co3O4 lead to a highly active and stable catalyst for N2O decomposition even in the presence of excess oxygen and steam.
The devolatilization kinetics of a biomass charcoal was studied by thermogravimetry−mass spectrometry. The overall mass loss rate (DTG curve) and the mass spectrometric intensities of ions H 2 +, CH 3 +, C 2 H 2 +, C 2 H 3 +, and C 2 H 5 + were evaluated. The distributed activation energy model (DAEM) was employed, si…