Materials Literature
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The partial discharge (PD) and electric breakdown mechanisms in SF 6 at a plug contact in the pressure range 25–150 kPa were investigated at ambient temperature in a plug–plate arrangement. This parameter range has similar particle number densities as in the previous investigation of the dielectric recovery in a high-…
Well-ordered periodic mesoporous organosilicas (PMOs) functionalized with high contents of carboxylic acid (COOH) groups, up to 85 mol % based on silica, were synthesized by co-condensation of 1,2-bis(triethoxysilyl)ethane (BTEE) and carboxyethylsilanetriol sodium salt (CES) under acidic conditions by using alkyl pol…
Polycrystalline RuB(1.1) has been prepared by using an arc-melting method and its structure and mechanical properties including elastic modulus, hardness and fracture behavior have been characterized. Also, the electronic structure and bond characteristics for this compound have been investigated by first-principles c…
Abstract 2,18‐Bis(diphenylphosphino)porphyrins undergo peripheral cyclometalation with group 10 transition‐metal salts to afford the corresponding porphyrin‐based PCP pincer complexes. The porphyrinic plane and the PCP‐pincer unit are apparently coplanar, with small strain. The catalytic activities of the porphyrin‐ba…
In this study the miscibility of polyvinyl chloride (PVC) and poly-e-caprolactone based thermoplastic polyurethanes (TPU) waste blends were investigated by dilute solution viscometry. The miscibility criteria a, Db, DB, and D[h] were used to assess the degree of miscibility of polymers in tetrahydrofuran solution. Als…
The vertical alignment of liquid crystals (LCs) on cetyltrimethylammonium bromide-coated (CTAB-coated)indium tin oxide (ITO) glass is the consequence of specific interactions between the LCs, CTAB and ITO surface. The CTAB concentration influences the LC orientation, which changes the ITO surface energy. Changes in th…
Order and dynamics of poly(styrene- b -1,4-isoprene), P(S- b -I), diblock copolymers in nanometer thin layers with different isoprene volume fractions ( f PI ) and identical molecular weight of the styrene blocks are studied by a combination of grazing-incidence small-angle X-ray scattering (GISAXS), atomic force micr…
We report on a change in the properties of monomolecular films of polyelectrolyte molecules, induced by illuminating the silicon substrate on which they adsorb. It was found that under illumination the thickness of the adsorbed layer decreases by at least 27% and at the same time the roughness is significantly reduced…
The reaction of (NO2 )(CF3 SO3 ) and elemental palladium in oleum (65 % SO3 ) leads to violet single crystals of Pd(HS2 O7 )2 (monoclinic, P21 /c, Z=2, a=927.80(9), b=682.58(7), c=920.84(9) pm, β=117.756(2)°, wR2 =0.0439). In the crystal structure, the Pd(2+) ions show an uncommon octahedral coordination of six oxygen…
The synthesis of star-shaped discotic liquid crystal trimers using Co2(CO)8-catalyzed terminal alkyne [2 + 2 + 2] cycloaddition reaction is reported. The trimers consist of three triphenylene discotic units linked to a central 1,2,4-trisubstituted benzene ring via flexible spacers. The trimers were synthesized in the…
A procedure is proposed to prepare electrically conductive epoxy resin composites exploiting in situ reduction of graphene oxide (GOx) during the epoxy thermal curing in presence of amine. The optimum curing conditions are evaluated, and the efficiency of the reduction process of GOx induced by amine is confirmed by X…
Detonation nanodiamond powders produced by different manufacturers were surface modified to reduce the amount of surface impurities and impart to the particles a high colloidal stability in aqueous suspensions. Modified DNDs (MDNDs) were separated into fractions and evaluated by the zeta potential, particles size dist…
Rare-earth stabilized bismuth oxides are known for their excellent ionic conductivity at intermediate temperatures. However, previous studies have shown that their conductivity deteriorates during extended heat treatments at 500-600 °C, although the fluorite phase is maintained. In this study, the enthalpies of format…
Using the first principle methods, we proposed a series of three-chain boron cages B6n+14 (n = 1-12) which are mainly built by fusing three boron semi-double-rings. Their simple geometric structures (approximate D3 or C3 symmetry) facilitate their bottom-up syntheses from the hexagonal B7 and the double-chain boron cl…
The search for efficient inhibitors to mitigate the corrosion of oil-well steels requires more experimental investigations of the performance of ecofriendly nontoxic organic inhibitors. With this objective, the inhibitive action of a selected inhibitor, furfuryl alcohol (FAL), on the corrosion resistance of 13Cr L80 s…
A model is presented that integrates the critical path approximation with percolation theory to describe the dependence of electrical conductivity upon volume fraction in nanofiber-based composites. The theory accounts for clustering and correlation effects that reflect non-randomness in the spatial distribution of th…
A glycosylated polyamine is synthesized using a straightforward route in aqueous solution. An optimum of grafting is obtained when equimolar amounts of gluconolactone and NaOH are added to an aqueous solution of poly(allylamine hydrochloride), PAH. Under these conditions, up to 60% of gluconolactone is grafted onto th…
Shape memory NR/PCL bio-based blends, where NR served as the reversible phase and PCL served as the switching phase, were prepared using a melt blending process. Peroxide, besides its role as a cross-linking agent to NR, was used to enhance the compatibility between NR and PCL, which was confirmed via Fourier transfor…
Amide and ester type polyols were synthesized from different kinds of tall oil and two types of ethanolamine (diethanolamine and triethanolamine). Poly(urethane amides) and polyester urethanes based on the synthesized polyols were prepared. The influence of the chemical structure of the obtained polyurethanes on densi…
A novel approach to enhance the catalytic performances in one-pot hydroxylation of phenol into catechol and hydroquinone was examined using core–shell type catalysts which consist of Pd nanoparticles (NPs) for direct synthesis of H 2 O 2 from H 2 and O 2 and Fe-containing mesoporous silica (Fe-MS) for hydroxylation of…