Materials Literature
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The structure of the incommensurate composite crystal of the trigonal sulfide Sr 1.145 TiS 3 , M r =244.42, has been analyzed on the basis of the four-dimensional superspace group P R3m 1s using powder X-ray diffraction data and the Rietveld analysis process. The unit cell and other crystal data are a 1 =a 2 =11.5108…
BaTiO 3 thin films possessing ferroelectric characteristics have been successfully synthesized using the laser ablation technique. The films are polycrystalline when deposited with substrate temperature higher than 550°C at 1 mbar oxygen pressure. All of the films are highly textured and dominated by (111) grains. The…
Abstract A study was made of the ceric ammonium nitrate (CAN) initiated graft copolymerization of methyl acrylate (MA) onto potato starch. The variables affecting the graft were investigated. The optimums have been obtained; they are the concentrations of MA, CAN, and nitric acid (HNO 3 ) (1.08, 5.0 × 10 −3 , and 0.08…
Oxovanadium clusters are intersting both as moels of bulk magnets and in their own right. Results are presented suggesting that in Na 6 [H 6 V 12 O 30 F 2 ]·22H 2 O (see Figure) it is meaningful to decide which particular vanadium centers should be considered at 5⊕ and which as 4⊕. It is shown that in principle ist is…
The activation energy for dc electrical conduction due to alkali ions of binary alkali silicate glasses and due to protons of binary alkaline-earth phosphate glasses decreases linearly with the logarithm of their concentrations (in mol/l). The activation energy is discussed in relation to the ionic radius and concentr…
Abstract Hydrotalcite-like compounds (HT) with 24%–48% Al 3+ -substitution have been synthesized in the Mg 2+ -Al 3+ -Fe(CN) 6 4- system. Conditioning of the synthesized and air-dried compound with K 4 Fe(CN) 6 4- solution at 80°C was essential to obtain the 80%–90% pure ionic Fe(CN) 6 4- form on an equivalent basis.…
Uniform layers of porous Si have been produced that show fine structure in their photoluminescence (PL) spectra characteristic of longitudinal optical cavity modes. This mode spacing can be modified in a predictable way by immersing the porous Si layer in heptane, which changes the average refractive index of the poro…
Abstract Maleation of a thermoplastic elastomer, styrene‐[ethylene‐butylene]‐styrene (SEBS) triblock copolymer, was carried out by a solution grafting reaction with maleic anhydride initiated by dicumyl peroxide. The reaction products from the graft reaction in xylene, commonly chosen as the solvent for maleation graf…
Abstract Natural Kaolinitic clays containing transition metals Fe and Ti in their lattice have been examined for their acidic properties and catalytic activity for the alkylation of benzene with benzyl chloride. Calcination of the clays at 550 °C and subsequent acid-activation using 2 M HCl (1 M = 1 mol dm−3) rendered…
Abstract Finite element simulations on permeability variations of an aligned fiber assembly have been conducted. Two dimensional viscous flow in longitudinal and transverse directions has been studied respectively, using the steady state Navier‐Stokes equation but with small Reynolds numbers. Two groups of packing str…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRedox properties of phosphazene polymers with pendant ferrocene groupsA. L. Crumbliss, D. Cooke, J. Castillo, and P. Wisian-NeilsonCite this: Inorg. Chem. 1993, 32, 26, 6088–6094Publication Date (Print):December 1, 1993Publication History Published online1 May 2002Published…
The distinction between «displacive» and «reconstructive» phase transformations is subjective, but rigorous classification into three types is possible using symmetry criteria. Type I shows a group- subgroup relationship between phase symmetries corresponding to a unique irreducible representation of the higher symmet…
A 6-in.-diagonal full-color antiferroelectric liquid crystal display with 220 × (320×3) color pixels has been developed. An analogue gray scale was achieved by utilizing in-pixel multidomain switching, and the satisfactory video images were obtained in the prototype display device.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTwo-dimensional silver electrocrystallization under monolayers spread on aqueous silver nitrateNicholas A. Kotov, M. Elisabete Darbello Zaniquelli, Fiona C. Meldrum, and Janos H. FendlerCite this: Langmuir 1993, 9, 12, 3710–3716Publication Date (Print):December 1, 1993Public…
We present results of absorption, near-steady-state and long-time photoinduced absorption, and light-induced electron-spin resonance (LESR) studies for the pernigraniline-base polymer (PNB), which has a Peierls ground state with multiple order parameters. Two kinds of defects have been observed and differentiated by p…
A model predicting the structure of repulsive, spherically symmetric, monodisperse particles confined between two walls is presented. When plate separations are small, only one layer of particles can be confined; however, when the plate separation is increased, multiple layers will eventually form. We study the buckli…
Assimilatory nitrate reductase (NR) was purified from the marine diatom Skeletonema costatum (clone Skel) using Cibacron blue-Sepharose affinity chromatography. The single-step purification scheme yielded a 103-fold purification of specific activity with an overall recovery of 40.8%. Only NADH-dependent NR activity (f…
Synthesis and Structure of the First Oligomeric Cyclic Dimethylsilyl‐Substituted Carbodiimide New oligomeric cyclic silylcarbodiimides 1–3 are synthesised by the reaction of the respective dichlorosilanes with cyanamide. From the resulting reaction mixture with dichloro‐dimethylsilane the tetrameric compound of the hy…
Treatment of infested banana fruits by aqueous leaf extracts of some medicinal plants, viz. Calotropis procera (Ait) R.Br., Vitex negundo Linn., Lantana camara Linn., Azadirachta indica Linn., Ficus religiosa Linn., Ocimum sanctum Lin., Thuja orientalis Linn., Argemone mexicana Linn., Achyranthes aspera Linn., Datura…
The effect of alternating oxic and anoxic conditions (12 h oxic‐12 h anoxie) on sulfate reducing activity, iron‐sulfur chemistry and the corrosion of mild steel, has been studied in biofilm reactors. During the experiment (35 d) an increasing activity of sulfate reducing bacteria was observed. A part of the produced s…