Materials Literature
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Henry reaction between nitroalkanes and aldehydes was performed in aqueous media, using NaOH 0.025M as catalyst, in the presence of cetyltrimethylammonium chloride (CTACl)as cationic surfactant.
Al-containing MCM-41 materials are prepared by grafting Al onto purely siliceous MCM-41; the resulting materials retain the hexagonal order and physical properties of the purely siliceous parent MCM-41 and exhibit higher Brønsted acid content compared to Al-MCM-41 prepared by direct hydrothermal synthesis.
Although spider silk has been studied for a number of years the structures of the proteins involved have yet to be definitely determined. X-ray diffraction and solid-state nuclear magnetic resonance (NMR) were used to study major ampullate (dragline) silk from Nephila clavipes. The silk was studied in its natural stat…
Tri- and tetra-dendron poly(amidoamine) (PAMAM) dendrimers were converted into hydrocarbon-soluble polymers and used as hydrophobic nanoscopic scaffolding by reacting their primary amino chain ends with various epoxyalkanes. These hydrophobically modified modules performed well as nanoscopic transport molecules. They…
ABSTRACT Fractional conversion ( f ) takes into account the nonzero texture property upon prolonged heating. This was applied as an alternate technique for reanalyzing texture degradation kinetics based on published data which indicated that the softening of vegetables followed a dual mechanism first order kinetic mod…
Inorganic nanoparticles in organic/inorganic hybrid devices are expected to have properties of interest for electroluminescence applications. The preparation of films of CdSe nanoparticles and poly(phenylenevinylene), PPV, by means of self‐assembly is presented and photoluminescence and electroluminescence studies of…
The synthesis and characterisation of some lead(ii) dithiocarbamato complexes Pb(S 2 CNRR′) 2 is reported. These compounds were used as single molecule precursors to produce nanocrystalline PbS by their thermolysis in trioctylphosphine oxide. The optical and morphological properties of the resulting PbS nanocrystallit…
Abstract This paper is a description of the stopping power routine utilized in the CASINO program that is based on the experimental measurement of the energy loss function (ELF). In addition, we present an ANSI C standard program that can be used to generate the data needed for the stopping power routine. Both optical…
Comb-like polyethylene oxide (PEO) surfaces were prepared on low-density polyethylene (PE). The comb-like PEO chain density was changed gradually along the sample lengths by corona discharge treatment with gradually increasing power and the following graft copolymerization of poly(ethylene glycol) monomethacrylate mac…
The concentration of acid sites in non-dealuminated (Si/Al=10), and dealuminated (Si/Al=20–90) H-beta zeolites has been studied by quantitative IR measurements of pyridine sorption. The number of Brønsted sites was found to be less than that of Al atoms. Most probably this was due to the presence of Al in extraframewo…
Methanol adsorption has been studied by IR spectroscopy on unreduced, microporous and non-microporous ceria samples presenting different surface areas. The spectra were assigned according to whether the so-formed methoxy species were on-top, doubly or triply bridged to cationic surface sites. Apparent molar absorption…
Poly(aniline)–poly(vinylsulfonate) composite-coated glassy carbon electrodes are found to give stable and reproducible electrocatlytic responses to NAD(P)H in citrate–phosphate buffer at pH 7. Analysis of these amperometric responses as a function of NAD(P)H concentration, film thickness, electrode potential and rotat…
The synthetic and structural chemistry as well as some physical and chemical properties of cyanide-bridged complexes containing two or more metal building blocks are discussed. Emphasis is laid on molecular shape and design and their consequences, including the effects of cyanide–isocyanide isomerism. Redox phenomena…
During recycling of chemical pulps, deterioration of pulp properties occurs due to hornification. This phenomenon is caused by irreversible structural changes taking place during drying. In this work. the role of pulp hemicelluloses in the hornification process of kraft pulps produced by different cooking and bleachin…
The hexadentate N 6 -donor podand tris[3-(2-pyridyl)pyrazolyl]hydroborate (Tp Py ) contains 2-pyridyl fragments attached to the pyrazolyl C 3 -positions such that each arm is a bidentate chelate. Three series of lanthanide(III) complexes were prepared: [M(Tp Py )(MeOH) 2 F][PF 6 ] (series A ), [M(Tp Py )(NO 3 ) 2 ] (s…
The crystal structure of κ-alumina (κ-Al 2 O 3 ) has been determined ab initio from an X-ray powder diffraction pattern (reliability factors: R Bragg =0.046, R p =0.090, R wp =0.115, χ 2 =11.7). The acentric structure (orthorhombic system, space group Pna2 1 , a=4.8437(2) Å, b=8.3300(3) Å, c=8.9547(4) Å, Z=8) is built…
Hydrothermal reactions of Na 2 MoO 4 ·2H 2 O and MoO 3 with MCl 2 ·xH 2 O (M = Co, Ni, Cu) and 2,2′-bipyridine yield one- and two-dimensional solids, characterized by molybdenum oxide monomers, clusters and chains linked by {M(2,2′-bpy)} 2+ groups and represented by the formulae [M(bpy) x - (H 2 O) y Mo n O 3n +1 ] (n…
Reversible photoinduced magnetization was observed in a cobalt iron cyanide thin film. Magnetic properties of the prussian blue analog, K 0.4 Co 1.3 [ Fe ( CN ) 6 ] ⋅ 5 H 2 O , can be switched between ferrimagnetic and paramagnetic by visible and near‐IR light illumination. The critical temperature after illumination…
Parent aniline oligomers such as tetramer and “16-mer” have been synthesized by a general method. This method can be used to synthesize other oligomers by selecting appropriate ratios of reactants and appropriate oxidants. The oligomers were characterized by UV/Vis, IR, NMR, mass spectroscopy, GPC and elemental analys…
Using a molecular-dynamics computer simulation we determine the temperature dependence of the partial structure factors for a binary Lennard-Jones system. These structure factors are used as input data to solve numerically the wave-vector-dependent mode-coupling equations in the long-time limit. Using the so-determine…