Materials Literature
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Summary Two sequential extractions with unbuffered 0.1 m BaCl 2 were done to study the release of salt‐exchangeable H + and Al from mineral horizons of five Podzols and a Cambisol. Released Al was found to have a charge close to 3+ in all horizons and in both extractions. This finding was supported by the near‐equalit…
In this paper we present a systematic study of the effect of the substitution pattern in the starting monomers on the resulting properties of some electrodeposited polydidodecylterthiophenes. The compared characterization of p-doping processes in regioregular electropolymerized poly-3‘,4‘- and 3,3‘ ‘-didodecyl-2,2‘:5‘…
The field of protein crystallography inspires and enthrals, whether it be for the beauty and symmetry of a perfectly formed protein crystal, the unlocked secrets of a novel protein fold, or the precise atomic-level detail yielded from a protein-ligand complex. Since 1958, when the first protein structure was solved, t…
The ${}^{27}\mathrm{Al}\mathrm{}\mathrm{NMR}$ spectrum and the spin-lattice relaxation rate of an icosahedral ${\mathrm{Al}}_{72.4}{\mathrm{Pd}}_{20.5}{\mathrm{Mn}}_{7.1}$ quasicrystal were studied in the temperature range from 300 to 4 K at two magnetic fields. The results are compatible with the hypothesis that a sc…
High-transparency, low-electrical-resistivity indium-tin-oxide (ITO)thin films were prepared on quartz substrates using synchrotron radiation ablation at room temperature. The films had a low resistivity (ρ=1.3×10 -4 Ω·cm) and high-transparency properties in the visible region ( T = 83% at 550 nm). X-ray diffraction p…
The effect of divalent substitution into lanthanide sites in La0.7Sr0.3-xCa x MnO3 oxides has been studied. In this system the average size (rA) of the A site cations is systematically varied while keeping the Mn3+ /Mn4+ ratio fixed at 7/3. Polycrystalline samples of La0.7Sr0.3-xCaxMnO3 were prepared using solid-state…
Abstract Oxidation of a dilute aqueous solution of a model azo dye pollutant (Orange II) was studied in batch and continuous well‐mixed (CSTR) reactors. Both reactors operate at 200–250°C, and total pressures up to 50 bar and at oxygen partial pressure from 10 to 30 bar. The model pollutant concentrations were in a ra…
19F nuclear magnetic resonance (19F NMR) of 5-fluorotryptophan (5F-Trp) and tryptophan (Trp) fluorescence both provide information about local environment and solvent exposure of Trp residues. To compare the information provided by these spectroscopies, the four Trp residues in recombinant soluble human tissue factor…
Abstract Maleic anhydride (MAH) modified polypropylene (PP) was demonstrated to be a chemical coupling agent in filled PP compounds. Improved properties were shown for talc and wollastonite filled PP compounds with MAH modified PP as a coupling agent. Partial replacement of glass fiber with wollastonite showed no redu…
A university library should be able to provide access to industrial standards through a properly developed collection policy and an ability to quickly acquire needed standards. The collection should support instruction in the basic curriculum and important areas of research at the university. Collecting beyond the min…
This paper presents a study of oxygen diffusion in YBa 2 Cu 3 O 7- (YBCO) using isothermal thermogravimetric analysis. Comparing the results of a solution of Fick's second law to the experimental data, it has been possible to calculate an expression for the chemical diffusion coefficient of oxygen in YBCO. The good ag…
High-temperature annealing experiments on metamorphic kalsilite (KAlSiO 4 ) indicate that there is an irreversible phase transition from the P31c to P63 structure at ~200 °C. Powder X-ray investigations indicate that the transformation is incomplete. The proportion of P6 3 phase increases as a function of temperature,…
Interactions of metals with inorganic and organic ligands including polymers are reviewed. Direct methods of synthesis have many possibilities in comparison to conventional synthetic methods. However, cryosyntheses with chelate-forming ligands have not been sufficiently devel—oped at the present time. Cryosyn thesis i…
A set of model compounds that mimic the graft sites of maleic anhydride (MA) functionalized polyolefins was synthesized and characterized with NMR spectroscopy. The acquired carbon nuclear magnetic resonance data were used to deduce chemical-shift increments for the prediction of 13C chemical shifts of MA functionaliz…
Abstract In a recent paper [1], the preparation techniques, structural features, crystallization, melting characteristics, and certain properties of the β-modification of isotactic polypropylene (β-IPP) were reviewed. Possible uses of β-IPP were demonstrated through example applications. The problems involved with the…
O balanço das reações de reticulação e cisão em cadeias poliolefínicas, quando expostas a condições ambientais de radicais livres, pode resultar em boas propriedades e novas aplicações. Materiais descartados de alta qualidade despertam cada vez mais interesse para reciclagem. Os resíduos plásticos de embalagens alimen…
A porous silicon lm (PS) was investigated by FTIR, Raman and photoluminescence (PL) spectroscopies. The Raman and PL spectra were obtained using four different laser excitations: 488, 514, 633 and 782 nm. The analysis of the first order and second order Raman scattering lines permits to identify the band energy struct…
Hydrothermally synthesized pyrophyllites (400° and 450 °C at 1 kbar for 7 days) have been compared to natural pyrophyllite in its dehydroxylation behaviour using infrared emission spectroscopy (IES). Upon heating to 750 °C dehydroxylation results in the loss of one OH group and the H associated with the next OH group…
<div class="htmlview paragraph">The lower temperatures encountered with European Stage III/IV turbo charged direct injection (DI) Diesel engines with additional features such as cooled exhaust gas recirculation (EGR), compared to Stage II engines, means that modern light duty Diesel engine exhaust gas will rarel…
We have investigated the anisotropic molecular orientation of poly [4, 4'-oxydiphenylene-1, 2, 3, 4-cyclobutanetetracarboximide] (CBDA-ODA) films induced by irradiation with linearly polarized ultraviolet light (LPUVL). The molecular orientation was monitored by measuring the polarized infrared (IR) absorption spectra…