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  • 1
    Electronic Resource
    Electronic Resource
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 24 (1996), S. 511-516 
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Vapor phase decomposition-droplet surface etching-graphite furnace atomic absorption spectroscopy (VPD-DSE-GFAAS) is discussed as a technique for the determination of low levels of metals in chemical oxides on silicon surfaces. The VPD-DSE-GFAAS technique was found to be statistically equivalent to results obtained by the standard surface techniques of total reflectance x-ray fluorescence spectroscopy (TXRF) and SIMS. The capability of the VPD-DSE-GFAAS technique has been extended to detection limits in the 107 to low 109 atom cm-2 range. A positive linear relationship was found for iron, calcium, zinc and aluminum deposited on a silicon wafer from an ammonium hydroxide-hydrogen peroxide-water (SC1) solution. Sodium and potassium deposition from SC1 solutions was found to be independent of solution concentrations. Deposition for these metals appeared to be primarily related to localized micron-sized nuclei deposits and not to adsorption on an atomic scale.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 43 (1992), S. 151-158 
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Measurement methods that are applicable for the characterization of porous structures, i.e. differential scanning calorimetry, low-temperature gas adsorption, mercury high pressure porosimetry, electron and light microscopy, X-ray small angle scattering, water retention value, and apparent density, are described with respect of the peculiarities of poly(acrylonitrile) fibres. The methods have been applied on differently stretched and thermally treated PAN fibres in the gel state and after dehydration, respectively. The observed effects are explained by the different stabilities of the gel fibre structure.
    Notes: Die zur Charakterisierung von Porenstrukturen anwendbaren Meßmethoden Differential-Scanning-Calorimetrie, Tieftemperatur-Gasadsorption, Quecksilber-Hochdruckporosimetrie, Elektronen- und Lichtmikroskopie, Röntgenkleinwinkelstreuung sowie Wasserrückhaltevermögen und scheinbare Dichte werden unter Berücksichtigung der Besonderheiten von Polyacrylnitrilfasern vorgestellt. Die genannten Methoden wurden auf unterschiedlich gereckte und thermisch behandelte PAN-Fasern im Gelzustand und nach Entwässerung angewendet. Die dabei auftretenden Effekte werden mit der unterschiedlichen Stabilität der Gelfaserstruktur erklärt.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0009-286X
    Keywords: Fischer-Tropsch-Synthese ; Suspensions-Reaktor ; Mn/Fe- und Fe/Cu-Katalysator ; Produktverteilung nach Schulz-Flory ; Geschwindigkeitskonstanten für Synthesegas-Verbrauch ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 35 (1984), S. 673-677 
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The properties of 3β-hydroxysteroides were modified by their conversion with polymer carriers and with polymerizable monomers, respectively. The acetalization was carried out under mild reaction conditions. In dependence of the nature of the 3β-hydroxysteroide and the solvent, respectively, acetals with an degree of conversions up t o 15% were obtained. Polymer carriers were prepared by radical polymerization of vinylacetate - crotonaldehyd. Dextranaldehyd was prepared by oxidation of dextran with NaIO4 Polymeric steroidesters were prepared by conversion of Sβ-hydroxy-steroides with methacryloylchloride and subsequent radical copolymerization with methacrylic acid.
    Notes: Zur Eigenschaftsmodifizierung polymerer Pharmaka wurden 3β-Hydroxysteroide mit polymeren Trägern bzw. polymerisierbaren Monomeren umgesetzt. Die Acetalisierung erfolgte unter milden Bedingungen und ergab in Abhängigkeit vom eingesetzten 3β-Hydroxysteroid bzw. vom Lösungsmittel Acetale mit einem Umsetzungsgrad von maximal 15%. Als polymere Träger wurden die auf radikalischem Wege hergestellten Copolymere Vinylacetat/Crotonaldehyd sowie der bei der Oxidation von Dextran mit NaIO4 erhaltene Dextranaldehyd eingesetzt. Polymere Ester wurden durch Umsetzung von 3β-Hydroxysteroiden mit Methacrylsäurechlorid und anschließender radikalischer Copolymerisation mit Methacrylsäure erhalten.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 26 (1998), S. 359-366 
    ISSN: 0142-2421
    Keywords: X-ray technique for structure analysis ; depth profiling ; nanocluster ; self-diffusion in metals ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Results obtained from scanning transmission electron microscopy combined with energy-dispersive X-ray imaging (EDX) and from Rutherford backscattering spectroscopy (RBS) of implanted and multilayered structures are compared in order to demonstrate the depth profiling capabilities of both analysis methods, especially at interfaces. Typical samples for dilute and concentrated systems are compared. The dilute system is represented by Ge nano-clusters in an amorphous SiO2 matrix on a Si substrate produced by ion implantation and subsequent annealing. The concentrated system of alternating Ag-Al multilayers (typical thickness ∽200 nm) is produced by evaporation on Si substrates under high vacuum conditions. A significant advantage of STEM-EDX is the two-dimensional mapping and depth profiling of light and heavier elements in heavy-Z substrates (depth scale in nanometres) without the lack of a deteriorating depth resolution at increasing depth, as happens in RBS. © 1998 John Wiley & Sons, Ltd.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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