Materials Literature
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Strengths and Weibull moduli for alumina/yttrium aluminum garnet eutectic (AYE) filaments and for Si‐C‐O (Nicalon TM ) filaments were calculated using measured and average filament diameters. The strengths agreed closely. Thus an average filament diameter could be used instead of the measured filament diameter in calc…
Abstract Self‐doped polyaniline modified electrodes were successfully fabricated by copolymerization of aniline and m ‐aminobenzoic acid in 0.5 mol L −1 sulfuric acid. The electrochemical characteristics of this resulting polymer were investigated. The polymer displayed electrochemical activity with the formal potenti…
A novel polymeric organosilicon gel with the composition [MeSi(NCN)1.5]n synthesized by the reaction of MeSiCl3 with Me3Si–N=C=N–SiMe3 is reported. The reaction is performed without any solvent and with catalytic amounts of pyridine and provides highly cross-linked poly(methylsilsesquicarbodi-imide) in the form of a s…
In the TiO 2 ‐SiO 2 system, anatase solid solutions (ss) containing up to similar/congruent ∼15 mol% SiO 2 are formed in the as‐prepared state by the hydrazine method. The lattice parameters a and c decrease linearly from 0.3785 to 0.3776 nm and from 0.9514 to 0.9494 nm, respectively, with increased SiO 2 content. At…
We report on an experimental and numerical study of tilted dendrites observed in thin-film directional solidification of a ${\mathrm{CBr}}_{4}{--8\mathrm{}\mathrm{mol}\mathrm{}%\mathrm{}\mathrm{C}}_{2}{\mathrm{Cl}}_{6}$ alloy for an arbitrary orientation of the crystal with respect to the plane of the sample and the p…
Using the bond-valence model, a relationship is developed between the thermal expansion of a chemical bond, its amplitude of thermal vibration and its force constant. An empirical expression found between bond valence and the force constants derived from vibrational spectroscopy allows all of these quantities to be pr…
Isothermal crystallization kinetics in the miscible mixtures of poly(ε-caprolactone) (PCL) and poly(styrene- co -acrylonitrile) (SAN) have been investigated as a function of the composition and the crystallization temperature by optical microscopy. The radial growth rates of the spherulites have been described by a ki…
Two novel metal alkoxide-derived routes were developed for the synthesis of nanocrystalline CdSe layers with quantum dot sizes between 1 and 4 nm. The first route, where cadmium ethoxy−acetate is reacted with bis(trimethylsilyl)selenium in the presence of aminopropyltriethoxysilane (AMEO), yields highly concentrated a…
The adsorption of mussel adhesive protein (MAP) from the marine mussel Mytilus edulis has been investigated on polystyrene (PS) and poly(octadecyl methacrylate) (POMA) surfaces using angle dependent X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM). AFM images previously published in the dehydra…
We report the optical properties of nanosized (≈4 nm) platinum particles synthesized in water-in-oil (w/o) microemulsions. The particles present a maximum at 220−256 nm, being highly position dependent upon the reaction medium. The aging of solutions causes cluster formation, whose absorption spectrum is rather differ…
The structures and intramolecular dynamics of [Ln(EGTA)(H 2 O)] - (Ln = La 3+, Ce 3+, Pr 3+, Nd 3+, Sm 3+, Eu 3+, Gd 3+, Tb 3+, Dy 3+, Ho 3+, Er 3+, Tm 3+, Yb 3+, Lu 3+ and EGTA 4 - = 3,12-bis(carboxymethyl)-6,9-dioxa-3,12-diazatetradecanedioate(4−)) in aqueous solution have been investigated by variable temperature 1…
Definite increases in the Curie point (T C ) of undoped and lanthanum‐ (La‐) doped (<0.5 at.%) barium titanate (BaTiO 3 ) ceramics sintered at elevated temperatures in the range of 1300°‐1450°C were observed. Both undoped and 0.3 at.% La‐doped BaTiO 3 (chosen as a typical doping concentration to yield semiconductin…
Abstract Motion of the guest molecules in kaolinite/dimethyl sulfoxide (DMSO) intercalation compounds Al 2 Si 2 O 5 (OH) 4 ∙(CH 3 ) 2 SO has been studied by means of solid-state nuclear magnetic resonance (NMR) in the temperature range between 300 and 380 K, which is just below the evolution temperature. The 13 C magi…
Linking chemotherapeutic drugs to a macromolecular carrier system may enhance tumor targeting, reduce toxicity and overcome drug resistance mechanisms. As an elementary model to evaluate the pharmacological properties of macromolecular drug carrier systems we chose rat serum albumin (RSA) for carrier and methotrexate…
A model for the CaO—SiO 2 —H 2 O system at 25°C is proposed, and based upon this, more complex systems including the effect of SO 4 2- , Cl - , CO 3 2- , Na + and K + on phase relations and solubilities in the title system have been calculated by thermodynamic modelling. At sea-water concentrations of NaCl, mixed sea-…
Three new series of processible polymeric precursors (PIN−HPZ, BCP−HPZ, DEB−HPZ) to SiNCB ceramic materials have been synthesized by reaction of hydridopolysilazane (HPZ) with the monofunctional boranes, pinacolborane (PIN−H), 1,3-dimethyl-1,3-diaza-2-boracyclopentane (BCP−H), and 2,4-diethylborazine (DEB−H). Polymers…
A binuclear tetraprotonated macrocyclic complex [Mg(2)(L(2)-H(4))(NO(3))(2)](NO(3))(2).6H(2)O (1) has been obtained by template condensation of 4-methyl-2,6-diformylphenol and 1,2-diaminoethane in the presence of magnesium acetate and nitrate. Complex 1 on reduction with NaBH(4), followed by the removal of magnesium,…
Five Victorian reservoirs of brick pillar and arch construction were renovated using geosynthetic clay liners (also called bentonite/geosynthetic composites) (GCL) as roof sealing materials. The GCL was predominantly sodium bentonite and contained some 2% of calcite. GCLs were laid on leveled, original puddled clay pa…
The hydrolytic condensation of PhSiCl3 (H2 O/acetone, 0–5°C, 18 h) precipitates cis-cis-cis-[(C6 H5 )4 Si4 O4 (OH)4 ] (5a) as the sole crystalline product in approximately 40% yield. The all-cis structure, which was originally assigned by J. F. Brown
The effect of hydrothermal conditions on the interactions between surfactant molecules and silicate species plays a key role in the structural transformations of silica precursors. In this work the structures of different siliceous products obtained at various synthesis temperatures have been characterized by powder X…