Materials Literature
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Four crystalline forms of tegafur were prepared by recrystallization from different solvents (α-, β-, δ-forms) and by heating (γ-form). They have been characterized using powder X-ray diffraction, thermal analysis, microscopy, density measurements and infrared spectroscopy. From differential scanning calorimetry measu…
The structure of rumbrin (Fig. 1), a new cytoprotective substance, was elucidated by NMR spectral analysis. Rumbrin was found to possess a novel skeleton containing alpha-pyrone, tetraene and pyrrole moieties.
Gas phase oxidation of benzene to phenol has been studied using Pd–Cu composite catalysts which were prepared mainly by impregnating the respective metal salts on silica gel. If one of the two metal species is absent from the catalyst, no catalytic activity is observed. Good performance is obtained with catalysts havi…
The photoluminescence of the layered titanates, K2Ti2O5, Na2Ti3O7, and K2Ti4O9 has been investigated. K2Ti2O5 showed a strong blue luminescence at room temperature. The luminescence of K2Ti2O5 was strongly affected by water intercalation and H+ exchange.
Contact angles have been obtained for four different liquids on surfaces of particles and plates coated with three different polymers, to give three different surface energies. The advancing contact angles on flat plates measured by the sessile drop and Wilhelmy plate methods were in very close agreement (ca 1°) over…
Differential scanning calorimetric (DSC) studies have been performed on binary mixtures of organic liquids at temperatures down to 100 K over the entire concentration range. The liquids investigated are simple liquids such as chlorobenzene and bromobenzene in cis-decalin and o-terphenyl. All the binary liquids exhibit…
The first silica-pillared titanoniobate has been prepared by firstly intercalating layered titanoniobate with NH2(CH2)3Si(OEt)3 and subsequently thermally removing the interlayered organics, the resulting pillared material is porous and has a high thermal stability beyond 750 °C.
CuO–ZnO–Al2O3 mixed oxides with different Cu : Zn : Al atomic ratios were obtained by thermal decomposition of hydroxycarbonate) precursors at 623 K in air for 24 h. Both precursors and mixed oxides were characterized by X-ray diffraction (XRD), diffuse reflectance spectroscopy (DRS) and X-ray photoelectron spectrosco…
Two clones of Asterionella ralfsii cf americana Körn. were more tolerant of acidic pH with respect to batch culture growth rate than their congener, A. formosa Hass. The relative inability of A. formosa to satisfy trace metal requirements at lower pH appeared to be a major factor in its reduced tolerance of acidic con…
The molecular structures of 10,10′-biacridinyl-9,9′-dione (5), 9-(10′-bromo-9′-anthryl)carbazole (9) and 9,9′-bicarbazyl (12) have been solved by X-ray crystallography. Proton and carbon-13 NMR studies of these and related compounds, show that in solution their conformations are also ‘scissor-like’. AM1 semi-empirical…
Impurity diffusion and the isotope effect of cobalt in α-iron have been studied by a serial radio-frequency sputtermicrosectioning method with radioactive tracers 57Co and 60Co in the temperature range 859 to 1173 K. Larger influence of the magnetic spin ordering on the diffusion of cobalt than that on the self-diffus…
Several molecules having multiple regions independently responsive to stimulations have been investigated. A 2-(4-methoxyphenylazo)anthraquinone (1) having both an electrochromic quinone group and a photochromic azo group has been synthesized and its electrochromic and photochromic properties investigated. It shows in…
Experiments carried out to describe the corona occurring in wire-cylinder geometries due to short voltage pulses of positive polarity, and to assess the influence of corona current and on the energy associated with each pulse of both the electrode geometry and the voltage waveshape are reported. The experimental setup…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTXAFS and thermogravimetry study of the sintering of calcium supported on carbonD. Cazorla-Amoros, A. Linares-Solano, C. Salinas-Martinez de Lecea, H. Yamashita, T. Kyotani, A. Tomita, and M. NomuraCite this: Energy Fuels 1993, 7, 1, 139–145Publication Date (Print):January 1,…
The kinetics of crystal growth of hydroxyapatite [Ca5(PO4)3OH, HAP], the thermodynamically most stable calcium phosphate phase, at 37 °C, pH 7.4 and ionic strength 0.1 mol dm–3 has been investigated. The kinetics results showed a surface-controlled spiral growth mechanism. The presence of 1,2-dihydroxy-1,2-bis(dihydro…
The X-ray structure of a unique dinuclear copper(II) compound containing a single hexafluorosilicato bridge, [Cu2L2(H2O)2(SiF6)]·2H2O (HL =N3-salicyloylpyridine-2-carboxamidrazone), is reported.
Spunbonded nonwoven fabrics are extensively used in a number of technical applications because of their physical, tensile, and hydraulic characteristics. In many cases, fabric is subjected to normal compressive loads, and the physical, tensile, and hydraulic properties change with these loads depending on the compress…
Reinforcing properties for polymers and elastomers, rheological properties of high density aqueous slurries, hidding power, lubricating properties of platey particles strongly depend on their size distribution and shape factor or aspect ratio (A.R.). Determinations of A.R. of fine particles by conventional methods are…
The complex anion [W2O5(cit)2]6– was obtained by crystallisation from an equimolar aqueous solution of sodium tungstate and citric acid (H4cit). It has been characterised by elemental analysis, IR and 1H and 13C NMR spectroscopy. The IR spectrum is consistent with a monooxo-bridged dinuclear structure as revealed by a…
This study was designed to isolate, chemically characterize, and pharmacologically evaluate the active principles present in a crude extract from the bark of Hymenaea martiana. β-Sitosterol-3-O-glycoside and three rhamnosides (eucryphin, engelitin and astilbin) were identified. As demonstrated previously with an alcoh…