Materials Literature
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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…
Defect parameters are calculated for a wide range of defects in UO2. In addition to internal energies, entropies of formation have been calculated for some defects. Enthalpies are obtained for comparison with experimental data, where available. Defect processes studied include intrinsic defects, cation substitution, i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotophysics, photochemistry, kinetics, and mechanism of the photochromism of 6'-nitroindolinospiropyranChristian Lenoble and Ralph S. BeckerCite this: J. Phys. Chem. 1986, 90, 1, 62–65Publication Date (Print):January 1, 1986Publication History Published online1 May 2002Publ…
A novel, soluble copper phthalocyanine containing four benzo-15-crown-5 moieties was synthesized and characterized by elemental analysis, i.r. and u.v. spectroscopy, and its alkali cation-complexing capability and selectivity studied.
Abstract The thermal expansion behavior for various aromatic polymides was investigated. Usally polymers, including polyimides, have high thermal expansion coefficients (3–6 × 10 −5 K −1 ), compared with metals and ceramics. However, there are some polyimides which have very low thermal expansion coefficients below 1…
We present a theory of epitaxial growth appropriate to overlayer materials that can adopt a bulk metastable crystal structure with a lattice constant significantly different from that of the stable ground state structure, as is common for metal epitaxy. This requires a generalization of the traditional Frank and van d…
Proton-exchanged K4Nb6O17 showed high activity for H2 evolution from aqueous methanol solution without any assistance from other materials such as noble metals.
A Van der Waals fluid, climbing from a reservoir along a vertical wall, should display a remarkable cascade of events : i) A macroscopic meniscus is set up in a short time t1 and reaches the classical altitude hc∼ 1 mm. ii) A dynamic precursor film appears at a time t2 ∼ 10-2 s. The tip of the « tongue» advances fast…