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Appl. Sci. 2018, 8(5), 755; https://doi.org/10.3390/app8050755

Rheological and Flocculation Analysis of Microfibrillated Cellulose Suspension Using Optical Coherence Tomography

1
VTT Technical Research Centre of Finland Ltd., P.O. Box 1603, FI-40101 Jyväskylä, Finland
2
Optoelectronics and Measurement Techniques Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, P.O. Box 4500, FI-90014 Oulu, Finland
3
Department of Physics, University of Jyvaskyla, P.O. Box 35, FI-40014 Jyväskylä, Finland
4
Spinnova Ltd., Palokärjentie 2-4, 40320 Jyväskylä, Finland
*
Author to whom correspondence should be addressed.
Received: 23 February 2018 / Revised: 1 May 2018 / Accepted: 7 May 2018 / Published: 10 May 2018
(This article belongs to the Special Issue Optical Coherence Tomography and its Applications)
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Abstract

A sub-micron resolution optical coherence tomography device was used together with a pipe rheometer to analyze the rheology and flocculation dynamics of a 0.5% microfibrillated cellulose (MFC) suspension. The bulk behavior of the MFC suspension showed typical shear thinning (power-law) behavior. This was reflected in a monotonously decreasing floc size when the shear stress exceeded the yield stress of the suspension. The quantitative viscous behavior of the MFC suspension changed abruptly at the wall shear stress of 10 Pa, which was reflected in a simultaneous abrupt drop of the floc size. The flocs were strongly elongated with low shear stresses. With the highest shear stresses, the flocs were almost spherical, indicating a good level of fluidization of the suspension. View Full-Text
Keywords: shear viscosity; yield stress; flocculation; velocity profile; microfibrillated cellulose; cellulose microfibrils; optical coherence tomography shear viscosity; yield stress; flocculation; velocity profile; microfibrillated cellulose; cellulose microfibrils; optical coherence tomography
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Koponen, A.I.; Lauri, J.; Haavisto, S.; Fabritius, T. Rheological and Flocculation Analysis of Microfibrillated Cellulose Suspension Using Optical Coherence Tomography. Appl. Sci. 2018, 8, 755.

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