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Michel Schenker, Joachim Schoelkopf, Patrick Gane, Patrice Mangin
Quantification of flow curve hysteresis data . a novel tool for characterising microfibrillated cellulose (MFC) suspensions
Appl. Rheol. 28:2 (2018) 22945 (13 pages)
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A novel method is introduced to describe quantitatively hysteresis seen in flow curves of microfibrillated cellulose suspensions.
Also, a data normalisation procedure is presented that allows a direct comparison of data from suspensions of different solids
contents. The discussion of the flow curve hysteresis of an MFC suspension is proposed to provide a lot of information on the
suspension morphology under flow. Such information is not only useful for process design, but also may serve as a quality
control tool. Hysteresis data as a function of the suspension solids content are provided, and considered with reference to an
overview made of peer work in the field. Two discrete hysteresis loop areas were found in the flow curves presented in this
work, each associated with a distinct shear rate region, one where the viscosity of the flow curve during shear rate increase is
higher than that of the shear rate flow curve at decreasing shear rate (named positive hysteresis) and another where it is the
opposite (named negative hysteresis). This behavior seems to have been rarely reported, and where reported we offer an explanation,
based on morphological models and rheometer measurement set up, as to why other researchers may find a variety
of hysteresis forms. It is hypothesised that the negative normalised hysteresis is mainly depending on the excessive flocculation/
structuration induced at intermediate shear rates during the shear rate increase, and that it is necessarily less with increasing
solids content because of the reduced availability of free water. The positive normalised hysteresis, however, is considered
to originate from the different morphologies at lower shear rates, i.e. the initial, homogeneous structure vs. the structure that
was previously induced by the intermediate shear during shear rate decrease. The positive normalised hysteresis appears not
to depend on the solids content, indicating a self-similarity or scaling behavior of the structuring with respect to the underlying
network structure.
► Cite this publication as follows:
Schenker M, Schoelkopf J, Gane P, Mangin P: Quantification of flow curve hysteresis data . a novel tool for characterising microfibrillated cellulose (MFC) suspensions, Appl. Rheol. 28 (2018) 22945.
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