Materials Literature
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Corrosion of sintered α‐SiC under thin films of Na 2 CO 3 /CO 2 , Na 2 SO 4 /O 2 , and Na 2 SO 4 /SO 3 was investigated at 1000°C. Chemical analysis was used to follow silicate and silica evolution as a function of time. This information couples with morphology observations leads to a detailed corrosion mechanism. In…
A series of covalently linked Zn–H2 porphyrin dimers has been synthesized. The linkage consists of a flexible alkoxy chain of variable length. Absorption spectroscopy shows that there is some exciton coupling between the two porphyrin rings, whilst fluorescence spectroscopy shows that the ZnP unit transfers singlet-st…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA novel photocatalytic process of amine N-alkylation by platinized semiconductor particles suspended in alcoholsBunsho. Ohtani, Haruyoshi. Osaki, Seiichi. Nishimoto, and Tsutomu. KagiyaCite this: J. Am. Chem. Soc. 1986, 108, 2, 308–310Publication Date (Print):January 1, 1986…
Abstract The impact fracture of nominally identical high impact polystyrene resins having different and well‐characterized rubber particle size distributions is discussed. A numerical model for craze termination is presented and its predictions are compared with experimental data. An alternative explanation for the ob…
This text provides an introduction to the fundamental concepts of crystallography, crystalline solids, and the diffraction of X-rays, electrons, and neutrons. The objective of this text is to provide a physical understanding of the subject rather than a rigorous development of crystallography and diffraction theory. A…
The crystal structures of K10[Co4(H2O)2(PW9O34)2]·22H2O (1) and isomorphous K10[Zn4(H2O)2(AsW9O34)2]·23H2O (2) have been determined {Mo-Kα radiation, space group P21/n, Z= 2; (1)a= 15.794(2), b= 21.360(2), c= 12.312(1)Å, β= 91.96°, R= 0.084 for 3 242 observed reflections [I 3σ(I)]; (2)a= 15.842(4), b= 21.327(5), c= 12…
A methodology based upon the concept of fabric unit cell structure and an energy approach has been developed for studying the elastic properties of three-dimensional fabric composites. In general, the unit cell assumes the shape of a parallelepiped with its size determined by the weaving parameters. The yarns can assu…
Polysilicate equilibria in concentrated sodium silicate solutions have been studied using potentiometric (glass electrode) and 29Si n.m.r. methods. Experimental data cover the ranges: 11.36 ⩽ pH ⩽ 14.09, 2.4 ⩽[Na+]tot/mol dm–3⩽ 9.6, 2.1 ⩽[Si]tot/mol dm–3⩽ 9.3 with a variation of SiO2/Na2O between 3.3 and 1.0. From ava…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBrownian dynamics simulation of wormlike chains. Fluorescence depolarization and depolarized light scatteringStuart A. AllisonCite this: Macromolecules 1986, 19, 1, 118–124Publication Date (Print):January 1, 1986Publication History Published online1 May 2002Published inissue…
Abstract Two kinetic models are presented that describe the dissolution of Al, Fe, Mn, and Mg from two forest soils by soluble organic acids. Dissolution of Al, Fe, and Mn occurred as a first‐order kinetic reaction. The rate was in the order Mn ≫ Al> Fe in di‐ and tricarboxylic acids, salicylic, p‐hydroxybenzoic, a…
Experiments were conducted to study the growth behavior of surface fatigue cracks in the circumferential plane of solid and hollow cylinders. In the solid cylinders, the fatigue cracks were found to have a circular arc crack front with specific upper and lower limits to the arc radius. In the hollow cylinders, the fat…
Glassy indomethacin was prepared by cooling the melt, and the glassy state was confirmed by the jump of heat capacity and the anomalous endothermic park (heat capacity maximum) in the differential scanning calorimetry (DSC) curve. The influences of the cooling rate of the melt and the heating rate of the glass formed…
Machine learning (ML) is transforming all areas of science. The complex and time-consuming calculations in molecular simulations are particularly suitable for an ML revolution and have already been profoundly affected by the application of existing ML ...Read More
Excimer-laser patterning of monocrystalline diamond was performed in the direct writing and in the optical projection modes. The etching mechanism employs combined photochemical/thermal transformation of the initial crystal to graphite followed by sublimation or reaction of the transformed solid. In optical projection…
Although collagen-containing implants are widely used in various surgical applications, there has been relatively little attention paid to the possibility that this type of biomaterial may undergo pathologic calcification which could compromise its function. The present study reports for the first time the calcificati…
The phenomenon of negative capacitance, which has been reported in a variety of situations involving electrolytic as well as electronic systems, does not appear to be understood and some tentative interpretations appear to lack plausibility. It is suggested that the physically correct approach lies in the analysis of…
The hydrolytic degradation rate of poly(L-lactide) molecules constituting the microcapsule membrane was estimated at different pH, ionic strength and buffer concentration. Poly(L-lactide) microcapsules were observed to be hydrolytically degraded rapidly in a strongly alkaline solution to lactic acid as the final produ…
Abstract Scanning electron microscopy (SEM) has shown various significant improvements since it first became available in 1965. These improvements include enhanced resolution, dependability, ease of operation, and reduction in size and cost. This article provides a detailed account of the instrumentation and principle…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSelective removal of electron-accepting p-toluene- and naphthalenesulfonyl protecting groups for amino function via photoinduced donor acceptor ion pairs with electron-donating aromaticsTatsuo. Hamada, Atsushi. Nishida, and Osamu. YonemitsuCite this: J. Am. Chem. Soc. 1986,…
A new selective deposition technology using electron beam induced surface reaction has been demonstrated. Electron beam induced W and Cr patterns were deposited by using WF6, WCl6, and Cr(C6H6)2 as sources, respectively. W and Cr depositions were confirmed by analysis using Auger electron spectroscopy (AES) and x-ray…