Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA new route to trimethylsilylated spherosilicates. Synthesis and structure of [Si12O18](OSiMe3)12, D3h-[Si14O21](OSiMe3)14, and C2v-[Si14O21](OSiMe3)14P. A. Agaskar, V. W. Day, and W. G. KlempererCite this: J. Am. Chem. Soc. 1987, 109, 18, 5554–5556Publication Date (Print):S…
The impedance of poly(vinylferrocene) (PVF) films coated on Pt electrodes and immersed in acetonitrile solutions containing 0.1 M tetra(n‐butylammonium) perchlorate has been examined. Three distinct regions are observed in the complex impedance plots for these films: kinetic control at high frequencies, diffusional co…
Abstract Voltammetric measurements on selected polypyrrole (PPy) films and defined soluble oligomers belonging to the oligo‐p‐phenylene and the oligo‐p‐phenylenevinylene series provide new insights into the charging/discharging properties of conducting polymers. It turns out that the current response in the whole acce…
A comprehensive study of the thickness dependence of the phase diagram of freely suspended films of the liquid crystal 4-n-heptyloxybenzylidene-4-n-heptylaniline (7O.7) between 50 and 69 \ifmmode^\circ\else\textdegree\fi{}C is reported. In thick films (thicker than about 300 layers and characteristic of bulk samples)…
Since the contribution of transformation toughening increases with the loca crack resistance (which is proportional to the toughness of the matrix), ZrO 2 particles were added to a toughened, whisker‐reinforced ceramic matrix. Analysis revealed that the combination of these multiple toughening agents should result in…
The aim of cytochemical techniques is to localize specific biochemical components in particular tissue and cell compartments. However, since preparation of tissues for structural observation results in major alterations of the properties of their components, a major problem is to retain an adequate degree of their bio…
Phase transitions of a system showing incommensurate phase and also critical point between commensurate and para-electric phases are studtied in an electric field. An effect of higher harmonics of the modulated phase on an appearance of a tricritical point is discussed. Some comments on the phase transition of NaNO 2…
The effect of interference between the various components of a system of spheres in the scattering function at small angles has been investigated in the framework of the Born–Green kinetic theory of fluids. Calculations have been made for close-packed systems of spheres with Schultz distribution of radii and two types…
Abstract Der Einfluß des mittleren Molekulargewichts (Viskositätsmittel) von Naphthalinsulfonsäure‐ und Melaminsulfonsäure‐Formaldehyd‐Polykondensaten auf ihre Eigenschaften als Dispergiermittel wurde an wässrigen Portlandzement‐ und Anhydritsuspensionen untersucht. Die rotationsviskosimetrische Erfassung der Dispergi…
The tensile deformation behaviour of high-purity niobium single crystals has been evaluated at temperatures between 4·2 and 77 K. An athermal plateau in the yield and thermal stresses between 40 and 77 K has been demonstrated. Anomalies were observed in the strain-rate sensitivity at all temperatures within this plate…
The three dimensional finite element analysis of eddy current problems using the complex magnetic vector potential is applied to a practical three phase power transformer. The eddy current densities in the oil tank and other steel structure parts and the magnetic flux densities in the whole transformer are computed. S…
Magnetic torque measurements have been made for a single crystal of Co of hcp structure in a very low field region where the torque intensity was not saturated. In this region it had been considered to be impossible to determine the magnetocrystalline anisotropy constants from observed torque curves. Recently, a new m…
Because of their importance to the development of magnetoresistive recording heads, the thickness dependence of the magnetoresistive properties of thin R.F. sputtered Permalloy films has been measured in the thickness range from 220Å to 5490Å. It was found that the\Delta\rho = \rho_{\parellel} - \rho_{\perp}exhibits a…
Summary A simple, single‐step extraction with LiEDTA for the estimation of CEC and exchangeable bases in soils has been developed. Multivalent cations are stripped from the soil adsorption sites by the strongly chelating agent EDTA, and are replaced by Li. In soils without CaCO3 or water soluble salts, exchangeable di…
The non‐ionic surfactant, Tween 80, stimulated the secretion of extracellular proteins by 35–140% in Thermomonospora curvata during growth on a variety of substrates. Cellulase secretion was also stimulated but fractionation of extracellular proteins by ion‐exchange high performance liquid chromatography showed that t…
The effect of the substitution of Fe by Co and Al in Nd2Fe14-x-yCOxAlyB (0 \leq x \leq 2, 0\leq y\leq 1) alloys on their domain structure has been investigated. The observations of the domain structure have been carried out at room temperature by means of the magneteoptical polar Kerr effect. The domain wall energy de…
A critical assessment is given of the likely modes of thermal decomposition of RDX. Previous publications by other authors report that thermally decomposed RDX produces nitroxide and nitronylnitroxide radicals as intermediates. These results are discussed, and it is suggested that these radicals are not primary decomp…
TEM studies of Zr-containing 2:17-type permanent magnet alloys show that the cellular microstructure develops from a high temperature 2:17R phase, first by the precipitation of Sm-depleted, Zr-rich "2:17H" platelet phase, then by the precipitation of Cu-rich, Fe- and Zr-depleted "1:5" boundary phase. These results are…
The complex 1 can be regarded as a kind of “inorganic sandwich compound” without metal–metal bonds: It contains an MnII atom sandwiched between two relatively flat [MnO2] moieties. 1 is obtained in the form of black crystals on treatment of [Mn3O(O2CPh)6(py)2(H2O)] in acetonitrile with solid salicylic acid. Noteworthy…
This paper considers the heat-to-heat variability in corrosion resistance and microstructure that might be encountered in low carbon AISI 316 nuclear grade stainless steels (SSs). The results will show that although these low carbon steels are rather resistant to sensitization by chromium depletion, they vary signific…