Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPerformance and stability of the organosilicon surfactant L-77: effect of pH, concentration, and temperatureMoritz Knoche, Hiroto Tamura, and Martin J. BukovacCite this: J. Agric. Food Chem. 1991, 39, 1, 202–206Publication Date (Print):January 1, 1991Publication History Publ…
The polarized absorption spectra, emission spectra, and fluorescence dynamics of Cr:forsterite are presented and analyzed in detail. At least three different kinds of emitting centers are identified by time-resolved spectroscopy. These correspond to two sorts of octahedrally coordinated Cr/sup 3+/ ions and one Cr/sup…
We study the curvature elastic properties of monolayers of diblock copolymers adsorbed at the interface of two incompatible solvents which are also selective solvents for the two blocks. At saturation, the interfacial free energy is minimized with respect to contributions from the chain conformation free energy, the i…
Passive films formed on AISI 304 stainless steel in neutral solutions are studied using photoelectrochemical technique. Photocurrents were investigated as a function of the wavelength of the incident light, the electrode potential and the time. The results of the measurements together with capacity measurements indica…
Acetal Resins Carbon Fibres Compatibility Composites Composites, Fabrication Composites, Testing Electrically Conductive Polymers Engineering Plastics Epoxy Resins Fibres, Engineering Heat-Resistant Polymers High Modulus Polymers Liquid Crystalline Polymers Optical Data Storage Polyamides, Aromatic Polyamides, Plastic…
Abstract
The interaction of an electron beam with a solid can be modeled by the so-called Monte Carlo method. This technique produces a stepwise simulation of the electron trajectory by using random numbers to predict scattering angles on the basis of theoretical probability distributions or empirical models. The physical basi…
Simultaneous measurements have been made in the scanning transmission electron microscope to determine relative microanalytical sensitivities for electron energy loss (EELS) and energy-dispersive x-ray spectroscopies (EDXS). A photodiode-array parallel detector was used for EELS, and an ultrathin window Si(Li) detecto…
The use of various modern techniques to examine particle–particle interactions in concentrated colloidal dispersions is reviewed. The analogy between colloidal dispersions and molecular fluids is drawn and the conditions for the formation of colloidal crystals discussed. The latter part of the article examines the rol…
The μ-cyano-bis[pentaamminechromium(III)] perchlorate and the analogous cobalt(III) complex have been prepared by a simple route. The complex behaves as a typical antiferromagnetic coupled chromium(III) dimer with a J value of 32.3(1) cm −1 . The EPR spectra of the complex diluted in a frozen glass or diluted with the…
The sintering of platelike Bi 4 Ti 3 O 12 powder particles was investigated. Special emphasis was given to the role of particle orientation in the green sheet on densification and microstructure development. Compacts were made by tape‐casting and dry‐pressing. During the initial stage of sintering, the particles rearr…
Oxygen diffusion in vitreous silica glass is studied using the gas exchange technique. The tracer concentration profiles are consistent with a model based on two mechanisms, one network and the other interstitial. These processes are coupled through limited network–interstitial exchange. Nuclear reaction analysis and…
Rosenberg. G. D. & Hughes, W. W. 1991 01 15: A metabolic model for the determination of shell composition in the bivalve mollusc, Mytilus edulis. Lethaia, Vol. 24. pp. 83–96. Oslo. ISSN 0024–1164. This research describes compositional variations within the shell of the extant mussel Mytilur edulis and proposes that th…
A partial discharge (PD) sensor has been developed which is able to unequivocally differentiate between PD in the winding and all types of electrical interference. Thus, the sensor will permit an online test for turbine generators, similar to the test now used for hyrogenerators. The sensor requires no high-voltage co…
The aim of the investigation is to evaluate the enhancement in the proper ties of coir-polyester composites by incorporating glass as intimate mix with coir. Addi tion of relatively small volume fraction (0.05) of glass enhances the tensile strength by about 100%, flexural strength by more than 50 % and impact strengt…
Versatile molecular precursors for the sol–gel synthesis of tungsten oxide thin films can be obtained via the reaction of tungsten oxychloride WOCl4 with alcohols. Oligomeric species [WOCl4 –x(OR)x]n are formed. Their molecular structure is analysed by infrared spectroscopy, nuclear magnetic resonance (NMR) spectrosco…
Electrophillic bromination occurs regiospecifically at the antipodal pyrrolenic ring of free-base porphyrins bearing substituents that fix the aromatic delocalization pathway; this new feature of porphyrin chemistry is not observed in the reactions of the corresponding metalloporphyrins as the pre-requisite bond fixat…
The levels of urease and asparaginase were elevated 25- and 20-fold, respectively, in extracts of Bacillus subtilis cells grown in medium containing nitrogen sources that are poor sources of ammonium (NH4+) compared with the levels seen in extracts of cells grown in medium containing nitrogen sources that are good sou…
An anatase precursor of V2O5/TiO2 catalysts contains nitrate and sulphate impurities, the former being destroyed by calcination at 673 K but surface sulphate remaining after calcination at 723 K. Two types of Lewisacidic site were distinguished by ammonia and pyridine adsorption. Slight surface Brønsted acidity was co…
An industrially feasible process for the polymerization of pyrrole or aniline on the surface of textile fibers and assemblies is discussed. Physical properties of the resulting fabrics are described as well as their stability under various condi tions. Fabrics coated with polypyrrole maintained the general physical pr…