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  • American Institute of Physics (AIP)  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Magnetic sphere rheometer (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 760-764 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A magnetic sphere rheometer which is fully controlled by a personal computer has been developed. It is capable of measuring viscosities in the range of 0.1–5×104 Pa (100–5×107 cP). It can operate at shear rates between 1 and 2×10−4 s−1 and measure relaxation times down to 100 ms. The precision of the determined viscosities is in the order of 0.3%. The present rheometer is an improvement compared to existing magnetic sphere rheometers both concerning the precision and the viscosity range of the measurements. Measurements on viscosity standards, as well as on semidilute solutions of poly(isobutylmethacrylate-t-butylaminoethylmethacrylate) [poly(IBMA-tBAEMA)] in dimethylacetamide (DMAA) and tetramethylethylenediamine (TMEDA) were performed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141086
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    High temperature magnetic sphere/needle rheometer (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 3828-3829 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A magnetic sphere/needle rheometer, which is capable of measuring viscosities between (approximately-equal-to)3×10−3 and 5×104 Pas at temperatures up to 380 °C, has been developed. The temperature dependence of the melt viscosity of a polyethylene sample is also reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140452
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Magnetic needle rheometer (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 3047-3050 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A magnetic needle rheometer has been developed. Its principle of operation is identical to the one of a magnetic sphere rheometer, except that the magnetic sphere is replaced by a magnetic needle. Important advantages result from this modification: (i) The lower limit of measurable viscosities ((approximately-equal-to)0.3 cP) becomes several orders of magnitude lower; (ii) analytic expressions for shear rate and shear stress have been derived; (iii) the needle can be covered by using a quartz capillary tubing, which is chemically much more inert than any magnetic material; (iv) precise determinations (±0.1%) of fluid densities, especially at high temperatures, are possible; and (v) the cost of manufacturing magnetic needles is much lower than for magnetic spheres. The device has been tested with viscosity standards.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140602
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    Paper (German National Licenses)
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