Macromolecular engineering of polylactones and polylactides. 7. Structural analysis of copolyesters of iε-caprolactone and L- or D,L-lactide initiated by triisopropoxyaluminum
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Preparation and Thermoelectric Properties of Mg<SUB>2</SUB>Si<SUB>1−<I>x</I></SUB>Ge<I><SUB>x</SUB></I> (<I>x</I>=0.0∼0.4) Solid Solution Semiconductors
Mg2Si1−xGex Solid Solution Semiconductors were prepared in the composition range 0.0≤x≤0.4. At a composition x=0.4, effects of impurities were investigated for dopants of Sb and Ag. Carrier concentrations were controlled up to 1.5×1026 electrons/m3 and 5.5×1025 holes/m3 by doping Sb and Ag, respectively. The thermal c…
Corona charging of polymers
A review of the corona charging of polymers is presented. After providing a brief account of the corona discharge process and of its application for charging materials, the paper focuses on the evolution of corona triodes that allow the sample surface potential to be monitored during the charging process. Particular e…
Probing depth of soft x‐ray absorption spectroscopy measured in total‐electron‐yield mode
Abstract Two series of experiments on well‐characterized systems were performed to examine the probing depth of soft x‐ray absorption spectroscopy (XAS) measured in total‐electron‐yield (TEY) mode. First we measured the Ni 2 p 3/2 absorption spectra of Ni(100) covered with Tb as a function of the overlayer thickness.…
Factors contributing to the stability of alkoxysilanes in aqueous solution
Parameters controlling intrinsic stability and reactivity of organosilanols generated from alkoxysilanes in aqueous environments have been elucidated in several experiments. Data involving kinetics, equilibrium, phase separation, and bonding studies of alkyl and organofunctional alkoxysilanes are presented. The studie…
A suite of programs for calculating x-ray absorption, reflection, and diffraction performance for a variety of materials at arbitrary wavelengths
One of the most useful characteristics of synchrotron radiation is the wide spectral distribution of the source. For applications involving tuned monochromatic beams it is often helpful to predict the x-ray optical characteristics of a sample or the beam line optics at a particular wavelength. In contrast to this desi…
Structure of dislocation cores in metallic materials and its impact on their plastic behaviour
Whilst the dislocation core structure was investigated in the early days of the dislocation theory, the importance of core effects for understanding the basic features of plastic behaviour was first recognized in the case of bcc metals. At this time the first extensive computer modelling studies of dislocation cores w…
Spectroscopic study of the interaction of carbon monoxide with cationic and metallic palladium in palladium–alumina catalysts
Palladium–alumina catalysts prepared from various precursors and by different preparation methods have been studied after calcination by O2 and reduction by H2, using IR spectroscopy of adsorbed CO, EPR and diffuse reflectance measurements. In addition to Pd2+ ions, the unreduced samples contain Pd3+ and Pd+ species.…
Contribution to Adsorption of Aromatic Amines on Mild Steel Surface from HCl Solutions by Impedance, UV, and Raman Spectroscopy
Generally, aromatic amines are regarded as effective inhibitors for pickling and acid cleaning of mild steel in hydrochloric acid. Most previous studies advocate the view that the inhibition is a result of adsorption of the π-electron cloud of the aromatic ring on the iron and steel surface through vacant dπ orbital o…
Role of metastable phases in the spontaneous precipitation of calcium carbonate
This paper reports a study of the spontaneous precipitation of calcium carbonate from aqueous solutions which are very supersaturated with respect to calcite, both in the absence of inhibitors, and in the presence of triphosphate as inhibitors. The sequence of events during precipitation is governed strongly by the in…
Steady‐State Passive Films: Interfacial Kinetic Effects and Diagnostic Criteria
The point defect model for steady‐state passive films formed anodically on metals in aqueous environments has been extended to include irreversible dissolution of the film and the irreversible generation and annihilation of cation and oxygen vacancies at the metal/film and film/solution interfaces. The model yields a…
Mutual solubilities: water-ketones, water-ethers, and water-gasoline-alcohols
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMutual solubilities: water-ketones, water-ethers, and water-gasoline-alcoholsRichard M. StephensonCite this: J. Chem. Eng. Data 1992, 37, 1, 80–95Publication Date (Print):January 1, 1992Publication History Published online1 May 2002Published inissue 1 January 1992https://pub…
Crushing Characteristics of Continuous Fiber-Reinforced Composite Tubes
Composite tubes can be reinforced with continuous fibers. When such tubes are subjected to crushing loads, the response is complex and depends on interaction between the different mechanisms that control the crushing process. The modes of crush ing and their controlling mechanisms are described. Also, the resulting cr…
Thermally irreversible photochromic systems. Reversible photocyclization of 1,2-bis (2-methylbenzo[b]thiophen-3-yl)perfluorocyclocoalkene derivatives
1,2-Bis(2-methylbenzo[b]thiophen-3-yl)perfluorocylopentenes undergo thermally irreversible photochromic reactions in which colouration/decolouration cycles can be repeated more than 104 times without significant loss of performance.
Synthesis of a titaniumsilicoaluminate isomorphous to zeolite beta and its application as a catalyst for the selective oxidation of large organic molecules
The isomorphous substitution of Si by Ti in the zeolite Beta framework by direct hydrothermal synthesis gives rise to useful catalysts for the selective oxidation of small and large organic compounds.
Kinetics of the hydrolysis and condensation of organofunctional alkoxysilanes: a review
A review of the literature is presented for the hydrolysis of alkoxysilane esters and for the condensation of silanols in solution or with surfaces. Studies using mono-, di-, and trifunctional silane esters and silanols with different alkyl substituents are used to discuss the steric and electronic effects of alkyl su…
Quasicrystals : a primer
How to fill space with atoms in condensed matter Real quasicrystals: preparation and characterization High-dimensional crystallography Where are the atoms? Phonons, phasons, and dislocations in quasicrystals A little more about the physics of quasicrystals.
Photoluminescence from defect centers in high-purity silica glasses observed under 7.9-eV excitation
Photoluminescence under 7.9-eV excimer-laser excitation was measured at room temperature on various types of high-purity silica glasses, which were classified based on the oxygen stoichiometry and OH concentrations. Several luminescence bands with different peak energies from 1.9 to 4.3 eV and decay constants were obs…
Diatoms: powerful indicators of environmental change
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDiatoms: powerful indicators of environmental changeSushil S. Dixit, John P. Smol, John C. Kingston, and Donald F. CharlesCite this: Environ. Sci. Technol. 1992, 26, 1, 22–33Publication Date (Print):January 1, 1992Publication History Published online1 May 2002Published iniss…
Antifungal Activity of Chitosan on Two Postharvest Pathogens of Strawberry Fruits
Effect of chitosan coating on decay of strawberry fruits held at 13 C was investigated. Strawberry fruits were inoculated with spore suspensions of Botrytis cinerea or Rhizopus stolonifer and subsequently coated with chitosan solutions (10 or 15 mg/ml). After 14 days of storage, decay caused by B. cinerea or R. stolon…