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  • Articles: DFG German National Licenses  (4)
  • 2005-2009
  • 1995-1999  (2)
  • 1990-1994  (2)
  • 1960-1964
  • oxygen evolution  (2)
  • rodlikemicelle  (2)
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  • Articles: DFG German National Licenses  (4)
Material
Years
  • 2005-2009
  • 1995-1999  (2)
  • 1990-1994  (2)
  • 1960-1964
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    The viscoelasticity of spinnable solutions of alkyltrimethylammonium salicylates (1992)
    Springer
    Colloid & polymer science 270 (1992), S. 249-258 
    Details
    ISSN: 1435-1536
    Keywords: Viscoelasticity ; spinnability ; tetradecyltrimethylammoniumsalicylate ; hexadecyltrimethylammoniumsalicylate ; rodlikemicelle
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The viscoelasticity has been measured for aqueous solutions of tetradecyl-and hexadecyltrimethylammonium salicylates (C14TASal, C16TASal). The aqueous solutions of C14TASal without salt displayed the gel-like behavior at 10.0×10−2 g cm−3, but those more dilute than 3.2×10−2 g cm−3 presented the viscoelasticity similar to that of a Maxwell liquid. The Maxwell-like behavior was converted to the polymer-like one on the addition of (0.1–0.2) M NaBr or (0.02–0.2) M NaSal. The gel-like viscoelasticity can be connected with the spinnability of “cohesive fracture failure”, and the Maxwell-like and polymer-like viscoelasticities are concerned with the spinnability of “ductile failure”. The gel-like and Maxwell-like viscoelasticities originate in the pseudo-network formed by the pseudo-linkages between rodlike micelles, while the polymer-like viscoelasticity is caused by the entanglement of long rodlike micelles in semidilute and concentrated solutions. The aqueous solutions of C16TASal behaved very similar to those of C14TASal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00655477
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The spinnability of viscoelastic solutions of tetradecyl- and hexadecyl-trimethylammonium salicylates (1990)
    Springer
    Colloid & polymer science 268 (1990), S. 460-468 
    Details
    ISSN: 1435-1536
    Keywords: Spinnability ; viscoelasticsurfactantsolution ; tetradecyltrimethylammoniumsalicylate ; hexadecyltrimethylammonium salicylate ; rodlikemicelle
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The spinnability was measured for aqueous viscoelastic solutions of tetradecyl- and hexadecyltrimethylammonium salicylates (C14TASal, C16TASal) in the absence and presence of sodium salicylate (NaSal) and sodium bromide (NaBr). The spinnability is classified into two types, D and C. While the intrinsic drawing length in type D is proportional to the drawing velocity, the drawing intrinsic length in type C decreases with the drawing velocity or is independent of it. The spinnability changes from type D to C, as the drawing velocity and the surfactant concentration increase, and the temperature lowers. The effect of salt is different between NaSal and NaBr. It can be assumed that a pseudo-network structure composed of rod-like micelles is formed in viscoelastic and spinnable surfactant solutions. Then, the spinnability depends on the balance between the elasticity and the viscosity in which the structure results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01411005
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Surface activation of manganese oxide electrode for oxygen evolution from seawater (1997)
    Springer
    Journal of applied electrochemistry 27 (1997), S. 1362-1368 
    Details
    ISSN: 1572-8838
    Keywords: manganese oxide electrode ; oxygen evolution ; seawater electrolysis ; surface activation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Utilizing the fact that the equilibrium potential of oxygen evolution is lower than that of chlorine evolution, oxygen evolution in seawater electrolysis was enhanced by decreasing the polarization potential under galvanostatic conditions through increasing the effective surface area of manganese oxide electrodes. Electrodes were prepared by a thermal decomposition method. IrO2-coated titanium (IrO2/Ti electrode) was used as the substrate on which manganese oxide was coated (MnOX/IrO2/Ti electrode). Subsequently, oxide mixtures of manganese and zinc were coated (MnOX–ZnO/MnOX/IrO2/Ti electrode). The effective surface area of the MnOX–ZnO/MnOX/IrO2/Ti electrodes was increased by selective dissolution of zinc (leaching) into hot 6M KOH. The oxygen evolution efficiency of the MnOX/IrO2/Ti electrode was 68–70%. Leaching of zinc from the MnOX–ZnO/MnOX/IrO2/Ti electrodes with 25mol% or less zinc led to a significant increase in the oxygen evolution efficiency. The maximum efficiency attained was 86% after leaching of zinc from the MnOX–25mol%ZnO/MnOX/IrO2/Ti electrode. However, large amounts of zinc addition, such as 40mol% or more are detrimental because of a decrease in the oxygen evolution efficiency. This is due to the formation of a double oxide, ZnMnO3, which is hardly dissolved in hot 6M KOH.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018421028624
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Anodically deposited manganese-molybdenum oxide anodes with high selectivity for evolving oxygen in electrolysis of seawater (1999)
    Springer
    Journal of applied electrochemistry 29 (1999), S. 769-775 
    Details
    ISSN: 1572-8838
    Keywords: anodic deposition ; manganese-molybdenum oxide electrode ; oxygen evolution ; seawater electrolysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Manganese-molybdenum oxide electrodes were prepared by anodic deposition on an IrO2-coated titanium substrate at a constant current density of 600Am−2 from baths containing 0.2M MnSO4 and 0–0.1M Na2MoO4 at 90∘C and pH 0.5. These electrodes were characterised for oxygen evolution in the electrolysis at 1,000Am−2 in 0.5M NaCl solution at 30∘C and pH 8 or 12. The most active and stable oxygen evolving anode exhibited 100% efficiency for oxygen evolution, and an efficiency of 98.5% for over 1,500 h at pH 12 and of 96.5% for over 2,800 h at pH 8 of continuous electrolysis. X-ray diffraction measurement and XPS analysis indicated that the deposits consist of a nanocrystalline single γ-MnO2 type phase, and manganese and molybdenum in the deposits are in the Mn4+ and Mo6+ states. The electrochemical studies showed that the manganese-molybdenum oxide electrodes drastically reduced the electrocatalytic activity for chlorine evolution to the undetectable level, resulting in 100% efficiency for oxygen evolution, although the addition of molybdenum slightly increased the oxygen overpotential.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003492009263
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    Paper (German National Licenses)
    Fulltext
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