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  • 1
    Electronic Resource
    Electronic Resource
    Oxidative Regeneration of Spent Molybdate and Tungstate Hydrotreating Catalysts (1994)
    s.l. : American Chemical Society
    Energy & fuels 8 (1994), S. 435-445 
    Details
    ISSN: 1520-5029
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ef00044a023
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Structure and dynamics of a polymer solution subject to flow-induced phase separation (1991)
    Springer
    Rheologica acta 30 (1991), S. 89-97 
    Details
    ISSN: 1435-1528
    Keywords: Mechanical rheometry ; polarimetry ; polystyrene ; segmental orientation ; flow-induced phase separation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract Experiments combining mechanical rheometry with polarimetry (birefringence and scattering dichroism) have been conducted on a 6% solution of polystyrene (1.86x106 molecular weight) in dioctyl phthalate. Birefringence is used to measure the extent of segmental orientation, whereas the dichroism is sensitive to orientation and deformation of concentration fluctuations associated with the process of flow-induced phase separation. The results indicate that these fluctuations grow predominately along the neutral (or vorticity axis) of a simple shear flow. At higher rates of shear, orientation in the flow direction is favored. The transition in orientation direction is accompanied by time-dependent behavior in the optical properties of the solution during shear and the onset of shear thickening of the viscosity and the first normal stress difference coefficient.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00366798
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Flow-induced concentration fluctuations in polymer solutions: Structure/property relationships (1993)
    Springer
    Rheologica acta 32 (1993), S. 1-8 
    Details
    ISSN: 1435-1528
    Keywords: Phase behavior ; rheo-optics ; second normal stress
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract Mechanical and optical rheometric measurements are reported on solutions of polystyrene dissolved in dioctyl phthalate, a solution that can undergo an apparent phase separation upon the application of shear. Solutions prepared using three molecular weights ranging from one to four million were studied. Time-temperature superposition was observed to apply for these solutions up to and including the onset of an apparent shear thickening of the steady shear and first normal stresses. Optical measurements employing turbidity and scattering dichroism determined that concentration fluctuations were enhanced by flow and grew parallel to the vorticity axis below the critical velocity gradient for the onset of the apparent shear thickening effect. Prior to the onset of thickening, the fluctuations were observed to rearrange and orient parallel to the flow direction. Second normal stress difference measurements indicate these solutions have a negative ratio of the second to the first normal stress differences. It is interesting to point out that the ratio tends to zero in the vicinity of the shear rate range at which shear thickening occurs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00396672
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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