Materials Literature
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Infrared spectra are reported of methanol adsorbed at 295 K on reduced Cu/SiO2 and on Cu/SiO2 which had been preoxidised by exposure to excess nitrous oxide. Methanol was chemisorbed on reduced Cu/SiO2 to give methoxy species on both silica and copper, gave a trace of formate on copper via reaction with residual surfa…
Phthalocyanines (H2Pc) octasubstituted with branched alkoxy chains were synthesized: 2,3,9,10,16,17,23,24- octakis(3,7-dimethyloctoxy)phthalocyanine (1a) and 2,3,9,10,16,17,23,24-octakis(3,7,11-trimethyldodecoxy)phthalocyanine (1b). Their mesomorphic properties were studied by DSC, polarization microscopy and X-ray di…
Abstract The harmonic balance method is a technique for the numerical solution of nonlinear analog circuits operating in a periodic, or quasi‐periodic, steady‐state regime. The method can be used to efficiently derive the continuous‐wave response of numerous nonlinear microwave components including amplifiers, mixers,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSyntheses of monometalated and unsymmetrically substituted binuclear phthalocyanines and a pentanuclear phthalocyanine by solution and polymer support methodsClifford C. Leznoff, Polina I. Svirskaya, Ben Khouw, Ronald L. Cerny, Penny Seymour, and A. B. P. LeverCite this: J.…
High-resolution electron-energy-loss spectroscopy of the surface of graphite reveals a discrete loss feature attributed to the excitation of a \ensuremath{\pi}-band plasmon polarized with E\ensuremath{\parallel}c. The frequency of the plasmon is found to be strongly temperature dependent. This arises from the contribu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFunctional metallomacrocycles and their polymers. 25. Kinetics and mechanism of the biomimetic oxidation of thiol by oxygen catalyzed by homogeneous polycarboxyphthalocyaninato metalsHirofusa Shirai, H. Tsuiki, E. Masuda, T. Koyama, K. Hanabusa, and N. KobayashiCite this: J.…
Oxidation behavior of a TiAl coupon was studied in a temperature range 1100 to 1400 K in a flow of purified oxygen at atmospheric pressure using thermogravimetry and standard metallographic techniques. The oxidation kinetics initially follows approximately a linear rate law. The oxidation rate decreases gradually as t…
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…