Multilayer adsorption of nitrogen and alkanes by non-porous carbons and silicas
Abstract
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Kossel diagrams of blue phases
CB15/E9 mixtures submitted to an electric field exhibit a tetragonal phase BPX, having a D10 4(I4122) symmetry and two hexagonal phases BPH3d and BPH2d The Kossel diagram technique allows us (a) to confirm the hexagonal symmetry of BPH3d and to determine precisely its space group D2 6 (P6222) and (b) to study the fiel…
Preparation and Calcium Complexation of Oxidized Polysaccharides. Part I: Oxidation of Maltodextrins and Starch with Alkaline Sodium Hypochlorite
Abstract The oxidation of maltodextrins and starch with aqueous alkaline sodium hypochloride has been studied. At an oxidant level of 3 moles hypochlorite per anhydroglucose unit at pH 8–9, a C2, C3‐glycol‐cleaved dicarboxy polysaccharide was obtained containing up to 45% ring‐opened glucose units. Hydrolysis of the o…
Magnetic hardening of SmFe/sub 10/V/sub 2/ by melt-spinning
Intrinsic coercivities as large as H/sub ci/=7.8 kOe were obtained in Sm-Fe-V alloys magnetically hardened by melt-spinning. As-quenched Sm/sub 0.87/Fe/sub 10/V/sub 2/ ribbons melt-spun at a substrate velocity of 20 m/s have an intrinsic coercivity H/sub ci/=6.9 kOe and remanence B/sub r/=5.1 kG. The Curie temperature…
Synthesis and characterization of ultrafine cobalt ferrites
Ultrafine, nearly spherical particles of CoFe/sub 2/O/sub 4/ were prepared under mild hydrothermal conditions. These ferrite particles were found to be superparamagnetic with a narrow particle size distribution in the range 10.0-40.0 nm. The hydrothermal ferrite powders could be sintered to almost theoretical density…
Steady-state thermal conductivity measurements of AlN and SiC substrate materials
Measurements of thermal conductivity on conventional and newly developed electronic ceramics are presented as part of an effort to incorporate the new high-thermal-conductivity ceramics into microcircuit manufacturing. Motivated by large variations in values claimed by different vendors for ostensibly similar material…
The use of polyoxometallates as acceptors in charge transfer salts: preparation, X-ray crystal structures, and preliminary spectroscopic characterizations of D3M6O19, D = TTF, TMTSF; M = Mo, W
The preparation, X-ray crystal structures, conductivities, and preliminary spectroscopic characterization of new charge transfer salts of general formula (D)32+ P2–, where D is an organic donor and P hexatungstate (or molybdate) acceptor dianions having the Lindquist structure, are given.
Morphology of Calcite Crystals in Clast Coatings From Four Soils in the Mojave Desert Region
Abstract Pedogenic calcite‐crystal coatings on clasts were examined in four soils along an altitudinal gradient on Kyle Canyon alluvium in southern Nevada. Clast coatings were studied rather than matrix carbonate to avoid the effects of soil matrix on crystallization. Six crystal sizes and shapes were recognized and d…
Effect of Deformation-Induced Martensitic Transformation on the Plastic Behavior of Metastable Austenitic Stainless Steel
The effect of deformation-induced martensite on the tensile behavior of metastable austenitic stainless steel has been investigated on a AISI Type 301 stainless steel containing a small amount of copper using the X-ray diffraction technique and transmission electron microscopy. The formation of martensite during tensi…
A new sonochemical carbonyl cross-coupling reaction
An α-unsaturated ketone and acetone undergo a selective coupling to an α-unsaturated vic-diol, under the influence of a zinc–copper couple and ultrasonic irradiation in aqueous acetone suspension.
Catalytic oxidation of organic substrates using alumina supported chromium and manganese
Supported reagents prepared by adsorption of chromium(VI) and manganese(VII) on alumina are capable of catalysing the aerial oxidation of organic substrates.
Comparison of the classical and generalized Preisach hysteresis models with experiments
The authors describe the experimental testing of the accuracy of the classical and generalized (nonlinear) Preisach models of hysteresis. The experiments performed for two typical magnetic tape materials show that both models are about equally accurate when the reversal values of the magnetic field are larger than or…
Solubility Limits and Formation of Intermetallic Precipitates in ZrSnFeCr Alloys
The intermetallic precipitates in Zircaloy are generally considered to be of special importance for the properties of the alloy. However, basic feature of the precipitate formation, such as the solubility limits of iron and chromium in a ZrSn matrix, are still unknown. Investigations have been performed with the objec…
Molecular Models Illustrating the Possible Distributions of ‘Holes’ in Simple Systematically Staggered Arrays of Type I Collagen Molecules in Native-Type Fibrils
Clear 3/8'' Lucite rod models at a scale of 1'' = D (the native-type period), and using four different colored ribbon markers to indicate one set of 'equivalent bands' in the SLS band pattern, clearly show the possible distribution of 'holes' and staining loci in native-type fibrils. Close-packed ordered arrays of the…
Heteropolyvanadates containing two and three manganese(IV) ions: unusual structural features of Mn2V22O6410- and Mn3V12O40H35-
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHeteropolyvanadates containing two and three manganese(IV) ions: unusual structural features of Mn2V22O6410- and Mn3V12O40H35-Hikaru Ichida, Kenji Nagai, Yukiyoshi Sasaki, and Michael T. PopeCite this: J. Am. Chem. Soc. 1989, 111, 2, 586–591Publication Date (Print):January 1…
Five-co-ordinated silicon compounds: geometry of formation by intramolecular co-ordination. Crystal structure of 2-(dimethylaminomethyl)phenyl-1-naphthylsilane
Studies of a wide range of intramolecularly five-co-ordinated silicon compounds with chelating nitrogen donors have been made, with a view to obtaining further information on the details of nucleophilic substitution reactions at silicon. The crystal structure of 2-(dimethylaminomethyl)-phenyl-1 -naphthylsilane has bee…
Interfacial reactions at copper surfaces coated with polyimide films prepared from poly(amide–acid) precursors
Thin films of polyimide were prepared by spin coating the poly(amide–acid) precursor onto copper and aluminum substrates, followed by the usual heat treatment to promote imidization (curing) of the film. Films prepared on aluminum substrates were completely cured during the heat treatment, as shown by x-ray photoelect…
Influence of heat treatment on the mechanical behaviour of a NiTi alloy.
Measurements of the effect of heat treatment following cold work on the yield and shape memory behaviour in a NiTi alloy are reported. Tensile behaviour is found to depend on test temperature and initial structure as well as annealing temperature. Minimum values of stress required for stress induced martensite, marten…
Particle Deformation and Counterface Damage When Relatively Soft Particles are Squashed Between Hard Anvils
Results from particle squashing tests designed to simulate the process of rolled in lubricant debris in rolling element bearings, are presented and showed to compare well with an earlier published theory. Measurements of the harder anvils after squashing various hard particles confirm our earlier theoretical results,…
Wettability of Solid Oxides by Liquid Pure Metals
As the wettability of solid oxides by liquid metals gives important information on the development of composite materials, metal- ceramics joinings, and the behaviour of deoxidation products in liquid metal, a large number of papers have been published. However, there are large discrepancies among the values reported.…