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  • Polymer and Materials Science  (12)
  • Inorganic Chemistry  (7)
  • CGH  (2)
  • 11
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 29 (1998), S. 496-505 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Examination of IBDA-aluminum-layers by electrochemical noise analysisThe quality of extremely thin surface coatings for wear and corrosion protection is significantly influenced by pores and film defects (voids, micro cracks, coated impurities), which can occure in the processing stage. These sites are substantially responsible for a mechanical or chemical degradation of the coating at contact with respective surrounding conditions. To meet the requirements of protection the processing stage is optimized by minimizing pores and flaws. Therefore a suitable testing method is necessary to detect the dissolution of the substrate at voids in the earliest stage and to examine large series with acceptable time expenditure for a statistical accuracy. Investigations for the optimization of coating parameters were carried out by means of Electrochemical noise analysis (ENA) on IBAD-aluminum-layers (ion beam assisted deposition) at mild steel(Ck45).
    Notes: Die Qualität von extrem dünnen Oberflächenbeschichtungen für den Korrosions- und Verschleißschutz wird stark durch das Vorhandensein von Poren und Schichtdefekten (Hohlräume, Mikrorisse, Flimmer etc.)beeinflußt, die infolge des Herstellungsprozesses auftreten können. Diese Stellen sind maßgeblich verantwortlich für eine mechanische oder chemische Degradation der Beschichtung bei Kontakt mit der jeweiligen Umgebung. Um den erforderlichen Schutz durch die Beschichtung zu gewährleisten wird der Beschichtungsvorgang durch eine Minimierung von Poren und Fehlstellen optimiert. dazu ist eine Untersuchungsmethode erforderlich, die die Auflösung des Substrates an diesen Fehlstellen im frühesten Stadium anzeigt, um auch große Probenserien zur statistischen Absicherung mit vertretbarem Zeitaufwand zu untersuchen. An IBAD-Aluminium-schichten (ion beam assisted deposition) auf unlegiertem Stahl (Ck45) wurden mit Hilfe der elektrochemischen Rauschanalyse erfolgreich Untersuchungen zur Optimierung von Beschichtungsparametern duchgeführt.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
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  • 12
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 30 (1979), S. 853-857 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Ion bombardment - a method for Investigating and preventingDuring the last years the technique of ion implantation gained increasing importance. It allows to introduce very element at any temperature in any material and to produce stable as well as metastable alloys. Applications for this method in corrosion science are pointed out in the light of results from different laboratories.First the stability of titanium and zirconium against thermal oxidation after ion bombardment is discussed. Then the passivation behaviour of iron irradiated with chromium and tantalum ions is mentioned. The third section deals with aqueous corrosion of iron and hydrogen evolution in diluted acids. The implantation of lead, gold and platinum is shown to modify the reaction rates by several orders of magnitude. Finally the possibility of using ion bombardment for the investigation of hydrogen embrittlement of metals is demonstrated.The results prove this method for the formation of alloys to allow studies being not accessible with more conventional techniques.
    Notes: In den letzten Jahren hat die Technik der Ionenbestrahlung von Materialien steigende Bedeutung gewonnen. Sie gestattet es, beliebige Elemente bei jeder Temperature in beliebige Basismaterialien einzubringen und sowohl stabile als auch metastabile Oberflächenlegierungen herzustellen. An Hand einer Reihe von Beispielen aus in- und ausländischen Labors werden Anwendungsmöglichkeiten in der Korrosionsforschung vorgestellt.Zunächst wird die Oxidationsbeständigkeit von mit Ionen bestrahltem Titan und Zirkon diskutiert, sodann das Passivierungsverhalten von Eisen, das mit Chrom- und Tantalionen beschossen wurde. Der Befund, daß die Korrosionsgeschwindigkeit und die Wasserstoffentwicklungsrate von Eisen in verdünnter Säure durch Implantation von Blei-, Gold-und Platinionen um mehrere Zehnerpotenzen verändert werden können, wird mitgeteilt. Schließlich wird die Möglichkeit, Ionenbeschuß zur Untersuchung der Wasserstoffversprödung von Metallen heranzuziehen, aufgezeigt. Die Ergebnisse beweisen, daß diese „Legierungsmethode“ Untersuchungen ermöglicht, die mit konventionellen Techniken kaum zugänglich sind.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 13
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 50 (1978), S. 669-673 
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Methodical design of a plant for the production of CaO for use in breathing equipment. The methodology of design nowadays taught at all technical universities can also be profitably applied to chemical engineering. Methodical examination of the production process for CaO used as CO2 absorber in respiratory equipment leads to a considerable improvement in product quality and to more economical production.
    Additional Material: 7 Ill.
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  • 14
    Electronic Resource
    Electronic Resource
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 26 (1998), S. 736-741 
    ISSN: 0142-2421
    Keywords: vanadyl pyrophosphate catalysts ; XPS ; ISS ; surface P/V ratio ; Cs+-doped (VO)2P2O7 catalysts ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The surface composition of (VO)2P2O7 catalysts was investigated by x-ray photoelectron spectroscopy (XPS) and ion scattering spectroscopy (ISS). The P/V ratio on the surface of (VO)2P2O7 catalysts from aqueously prepared precursors lies between 1.3 and 1.4, based on XPS calibrations with different VPO glasses as standard materials. With ISS we obtained a higher P/V ratio of (VO)2P2O7 catalysts in the outermost layer of ∽2-3.The addition of caesium (Cs+) caused a further increase in the P/V ratio of the surface of (VO)2P2O7 with increasing Cs+ concentration. Ion scattering spectroscopy indicated that Cs+ was mainly confined to the uppermost layers, and at high doping concentrations a total surface coverage with Cs+ was achieved.The influence of water vapour on the surface composition of the catalysts was also investigated. A migration and a loss of phosphorus was found after and during water vapour treatment using XPS, ISS and thermogravimetric measurements. The surface of (VO)2P2O7 is assumed to be a dynamic system influenced by the partial pressure of water vapour in the gas phase. The rate of bulk oxidation of (VO)2P2O7 was dependent on the water vapour content in the gas phase. © 1998 John Wiley & Sons, Ltd.
    Additional Material: 8 Ill.
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  • 15
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: In the production of high molecular weight aromatic polyamides which are soluble in polar solvents, novel aromatic diamines with oxdiazole, triazole, thiadiazole, thiazole, hydantoin, quinazolone and quinazolinedione ring systems - some of the novel aromatic diamines contain ether or sulfone groups - are reacted with aromatic dicarboxylic acid dichlorides (e.g. iso- or terephthaloyl dichloride) in polar organic solvents (e.g. N.N-dimethylacetamide or N-methyl-pyrrolidone).Filaments and fibres which possess a very good strength and a high thermal stability can be produced. Polyamides of diamines with quinazolinedione ring systems are most stable to high temperatures and are further distinguished by being only slightly liable to combustion.The new polyamides dissolved in polar solvents are suitable in the production of flexible films which are stable to high temperatures.
    Notes: Zur Herstellung von hochmolekularen aromatischen Polyamiden, die in polaren Lösungsmitteln löslich sind, wurden neue aromatische Diamine mit Oxdiazol-, Triazol-, Thiadiazol-, Thiazol-, Hydantoin-, Chinazolon- und Chinazolindion-Ringsystemen, die zum Teil auch noch Äther- oder Sulfongruppen enthalten, mit aromatischen Dicarbonsäuredichloriden (z. B. Iso- oder Terephthaloyldichlorid) in polaren organischen Lösungsmitteln (z. B. N.N-Dimethylacetamid oder N-Methylpyrrolidon) umgesetzt.Es konnten Fäden und Fasern hergestellt werden, die eine sehr gute Festigkeit und eine hohe Temperaturbeständigkeit aufweisen. Polyamide aus Diaminen mit Chinazolindion-Ringsystemen waren thermisch am beständigsten und zeichnen sich außerdem durch eine sehr geringe Brennbarkeit aus.Aus ihren Lösungen in polaren Lösungsmitteln lassen sich die neuen Polyamide auch zu geschmeidigen, hochtemperaturbeständigen Filmen verarbeiten.
    Additional Material: 8 Tab.
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  • 16
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 588 (1990), S. 139-146 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Structure of a New Modification of Phosphorus Sulfide P4S9A new modification of P4S9 is formed by the reaction of phosphorus pentasulfide with isopropanol in a molar ratio 1:4. The pure substance can be isolated by repeated fractional crystallization from CS2. This modification crystallizes in the monoclinic space group P21/n with a = 855.5 pm, b = 1263.7 pm, c = 1245.3 pm, β = 104.94°, Z = 4. Normally the P4S9 I crystallizes from its melts, only by shorttime heating the cubic modification (P4S9 II) is yielded.
    Notes: Bei der Reaktion von Phosphor(V)-sulfid mit Isopropanol im Molverhältnis 1:4 bildet sich eine neue Modifikation des P4S9. Die reine Substanz läßt sich durch mehrfache fraktionierte Kristallisation aus CS2 isolieren. Diese Modifikation kristallisiert in der monoklinen Raumgruppe P21/n mit a = 855,5 pm, b = 1263, 7 pm, c = 1245,3 pm, β = 104,94°, Z = 4. Nach kurzzeitigem Aufschmelzen kristallisiert die kubische Modifikation (P4S9 II), während längeres Schmelzen zur Kristallisation des P4S9 I führt.
    Additional Material: 2 Ill.
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  • 17
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Studies on the Preparation of the Phosphoric Acid Fluoride Pyridinium Betaine, Py · PO2F (Py = Pyridine)Under anhydrous reaction conditions phosphoric acid chloride betaine, Py · PO2Cl (I), does not react with NaF or NaSO2F to the corresponding fluorine compound Py · PO2F (II). Reaction between AsF3 and I gives rise to the formation of compound II which is detectable by N.M.R.In an excess of pyridine POCl2F reacts with P4O10 to a mixture of I and II which are difficult to be separated. In a preparatively simple way II can be obtained by sulfur-oxygen exchange in liquid SO2 starting from dithiophosphoric acid fluoride betaine Py · PS2F.
    Notes: Versuche, ausgehend vom Phosphorsäurechloridpyrididiumbetain, Py · PO2Cl (I), unter wasserfreien Bedingungen durch Cl—F-Austausch das entsprechende Fluoridbetain, Py · PO2F (II), darzustellen, führen bei Verwendung von NaF und Natriumfluorosulfinat nicht zum Ziel, während bei der Reaktion mit AsF3 II im Reaktionsgemisch NMR-spektroskopisch nachgewiesen werden kann. Die Umsetzung von POCl2F mit P4O10 in überschüssigem Pyridin führt zu einem Gemisch aus I und II, aus dem jedoch II nur schwer isolierbar ist. In präparativ einfacher Weise kann II durch Schwefel-Sauerstoff-Austausch aus dem Dithiophosphorsäurefluoridbetain, Py · PS2F, in flüssigem SO2 erhalten werden.
    Additional Material: 1 Ill.
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  • 18
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Contributions to the Chemistry of Phosphorus Compounds with Adamantane-like Structure. VII. Preparation and Properties of Nonathio CyclotriphosphateReaction of both, P4S10 and P4S9, in liquid ammonia below -33°C yields ammonium nonathio cyclotriphosphate, (NH4)3[P3S9] (I), which crystallizes on cooling to -78°C. On ammonolytic decomposition of I trithio amidophosphate, (NH4)2[PS3(NH2)], is obtained. I reacts with PCl3 re-building the adamantane-like structure of P4S9. Further properties and reactions of I are described.
    Notes: Die Reaktion von P4S10 oder P4S9 mit flüssigem Ammoniak führt unterhalb -33°C zu Ammoniumnonathiocyclotriphosphat, (NH4)3[P3S9] (I), das beim Abkühlen auf -78°C auskristallisiert. Bei der ammonolytischen Spaltung von I entsteht Amidotrithiophosphat, (NH4)2[PS3(NH2)]. Mit PCl3 reagiert I unter Rückbildung der Adamantanstruktur des P4S9. Weitere Eigenschaften und Reaktionen von I werden beschrieben.
    Type of Medium: Electronic Resource
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  • 19
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 329 (1964), S. 56-67 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The existence of dibromophosphoric acid formed by hydrolysis of phosphoryl bromide in acetone-Water mixtures has been proved by titration and by precipitation of the nitron salt. By condensation of partially hydrolyzed phosphoryl bromide, mixtures of polyphosphoric acids are formed. The end groups of these acids are supposed to be substituted by bromine atoms.
    Notes: Die Existenz der bei der Hydrolyse des Phosphoroxidbromids in Aceton-Wasser-Gemischen gebildeten Dibromophosphorsäure wurde titrimetrisch und durch Fällung des Nitronsalzes bewiesen. Durch Kondensationsreaktionen des partiell hydrolysierten Phosphoroxidbromids entstehen Gemische von Polyphorsäuren, deren Endgruppen wahrscheinlich durch Br-Atome substituiert sind.
    Additional Material: 5 Ill.
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  • 20
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 365 (1969), S. 294-300 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The preparation of bis(ethylacetate)-calcium-difluorophosphate is described. As shown by X-ray single crystal investigations, this compound belongs to the class of coordination polymers having a chain-like double-bridge structure.
    Notes: Die Darstellung des Bis(äthylacetat)-calcium-difluorophosphates Ca[PO2F2]2 · 2 CH3COOC2H5 wird beschrieben und durch röntgenographische Strukturuntersuchung nachgewiesen, daß diese Verbindung zur Gruppe der Koordinationspolymeren mit Doppelbrückenstruktur gehört.
    Additional Material: 3 Ill.
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