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

Antti I. Koponen; Janne Lauri; Sanna Haavisto; Tapio Fabritius

doi:10.3390/app8050755

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

Antti I. Koponen^*
, Janne Lauri
, Sanna Haavisto
, Tapio Fabritius

^*Corresponding author for this work

University of Oulu
University of Jyväskylä
Spinnova Oyj

Research output: Contribution to journal › Article › Scientific › peer-review

14 Citations (Scopus)

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.

Original language	English
Article number	755
Journal	Applied Sciences
Volume	8
Issue number	5
DOIs	https://doi.org/10.3390/app8050755
Publication status	Published - 10 May 2018
MoE publication type	A1 Journal article-refereed

Funding

Academy of Finland (project 288694) is gratefully acknowledged for supporting this work.

Keywords

Cellulose microfibrils
Flocculation
Microfibrillated cellulose
Optical coherence tomography
Shear viscosity
Velocity profile
Yield stress

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10.3390/app8050755

Cite this

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title = "Rheological and Flocculation Analysis of Microfibrillated Cellulose Suspension Using Optical Coherence Tomography",

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.",

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AU - Koponen, Antti I.

AU - Lauri, Janne

AU - Haavisto, Sanna

AU - Fabritius, Tapio

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N2 - 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.

AB - 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.

KW - Cellulose microfibrils

KW - Flocculation

KW - Microfibrillated cellulose

KW - Optical coherence tomography

KW - Shear viscosity

KW - Velocity profile

KW - Yield stress

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M3 - Article

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JF - Applied Sciences

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ER -

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

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Keywords

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