Materials Literature
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A suite of gem zircon samples from Sri Lanka has been studied using infrared (IR) spectroscopy, X-ray diffraction, and chemical analysis. The degree of metamictization of the zircon, as indicated by unit-cell parameters, increases systematically with U-Th content \nup to the point of total metamictization. The app…
The convection-induced increase of the wave front velocity in the iodate-arsenous acid system can be explained by considering the convective flow velocity caused by the density gradient in the reaction front. The density is decreased by the exothermicity of the reaction and by the positive volume change of the reactio…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExploration of new cooperative proton-electron transfer (PET) systems: first example of extended conjugated quinhydrones, 1,5-dihalo-2,6-naphthoquinhydronesKazuhiro Nakasuji, Kenichi Sugiura, Toshikazu Kitagawa, Jiro Toyoda, Hiroshi Okamoto, Kaoru Okaniwa, Tadaoki Mitani, Hi…
Basic processes, parameters, and mechanisms are discussed with special reference to hydrodynamics, mechanical actions of one- and two-phase flows, transport processes, electrochemical steps, and mechanical properties of the wall of the flow system. The terminology is clarified. New results on erosion-corrosion in part…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDynamic mechanical measurement of crystallization-induced gelation in thermoplastic elastomeric poly(propylene)Y. G. Lin, D. T. Mallin, J. C. W. Chien, and H. H. WinterCite this: Macromolecules 1991, 24, 4, 850–854Publication Date (Print):February 1, 1991Publication History…
The magnetic interactions between copper(II) and imino nitroxide free radicals have been investigated in two novel adducts of copper(II)-bis(hexafluoroacetylacetonato): bis(mu-1,3-(2-phenyl-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazolyl-1-oxy))hexakis(hexafluoroacetylacetonato)tricopper(II) (1) and (2-(2-pyridyl)-4,4,5…
ABSTRACT The importance of immigration, growth, and competition for nutrients and light in benthic diatom succession was studied in experimental channels in a low‐nutrient stream. Diatom accumulation was greater in channels enriched with nitrate and phosphate (NP) than in control channels, reaching about 5 × 10 6 and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymers grafted to a convex surfaceR. C. Ball, J. F. Marko, S. T. Milner, and T. A. WittenCite this: Macromolecules 1991, 24, 3, 693–703Publication Date (Print):February 1, 1991Publication History Published online1 May 2002Published inissue 1 February 1991https://pubs.acs.o…
The relationship between surface-enhanced resonance Raman scattering (SERRS) intensity and the rate of deposition during silver-island film preparation was examined, using zinc tetraphenylporphine (ZnTPP) as the adsorbate. The effect of the deposition rate on the optical properties of the films at specific wavelengths…
The carrier transport mechanism of the Si solar cells having n-Si/indium tin oxide (ITO) junctions has been studied by use of the current-voltage and capacitance-voltage measurements and x-ray photoelectron spectroscopy. An 11-Å-thick nonstoichiometric Si oxide layer is formed when ITO is deposited by spray pyrolysis…
The stress corrosion cracking (SCC) of aluminum alloys is a well-documented phenomenon, but there is considerable disagreement in the scientific literature as to what mechanism causes it. This paper reviews the past 10 years of publications and describes the experimental methods and the proposed SCC mechanisms of abou…
In situ monitoring of mass change was performed during electrochemical growth and redox cycling of a conducting polymer(polypyrrole) on a quartz crystal microbalance. For the polypyrrole films grown with large polymeric anions(poly(4‐styrenesulfonate) and polyvinylsulfonate), mostly cations and solvent molecules were…
Pseudomonas oleovorans accumulates poly(3-hydroxyalkanoates) (PHAs) after growth on medium chain length hydrocarbons. Large amounts of this polyester are synthesized when cells are grown under nitrogen-limiting conditions. When nitrogen is resupplied in the medium, the accumulated PHA is degraded. In this paper, we de…
Diamond films, produced by microwave plasma assisted chemical vapor deposition, were studied using cathodoluminescence (CL) scanning electron microscopy and spectroscopy techniques. Luminescence intensities of the observed prominent peaks at 420, 445, and 738 nm were found to vary widely as a function of both the depo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnalysis of molybdenum(3d) XPS spectra of supported molybdenum catalysts: an alternative approachWolfgang Gruenert, A. Yu. Stakheev, Reinhard Feldhaus, Klaus Anders, E. S. Shpiro, and Kh. M. MinachevCite this: J. Phys. Chem. 1991, 95, 3, 1323–1328Publication Date (Print):Feb…
In order to explain discontinuous brittle cracking in materials subjected to hydrogen, single-crystal and crack/dislocation simulation studies have been made. The computational scheme allows the local stress tensor near a crack in an anisotropic elastic solid with shielding dislocations to be determined. The model sys…
Waste products of the shellfish industry have applications as diet supplements and in food processing waste management, beverage clarification, and the production of packaging films
The first part of this report deals with a new linear model of the capacitor. It is based entirely on old concepts and results that have not been combined before. The model current after a voltage step at t = 0 is proportional to t − n where n is a number less than but close to one. In the frequency domain losses are…
The 29Si and 23Na NMR, Raman, and infrared spectra of glasses quenched from liquids at pressures up to 12 GPa for three alkali silicate compositions (Na2Si2O5, Na2Si4O9, K2Si4 O9) and silica (SiO2) reveal systematic changes in the melt structure with pressure. The most novel change is the occurrence of [5]Si and [6]Si…
The attachment, spreading, spreading rate, focal contact formation, and cytoskeletal organization of human umbilical vein endothelial cells (HUVECs) were investigated on substrates that had been covalently grafted with the cell adhesion peptides Arg-Gly-Asp (RGD) and Tyr-Ile-Gly-Ser-Arg (YIGSR). This approach was used…