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

Antti I. Koponen (Corresponding Author), Janne Lauri, Sanna Haavisto, Tapio Fabritius

Research output: Contribution to journalArticleScientificpeer-review

2 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 languageEnglish
Article number755
JournalApplied Sciences
Volume8
Issue number5
DOIs
Publication statusPublished - 10 May 2018
MoE publication typeA1 Journal article-refereed

Fingerprint

Optical Coherence Tomography
Optical tomography
Cellulose
Flocculation
Shear stress
Shear Stress
Shear thinning
Fluidization
Rheometers
Rheology
Wall Shear Stress
Shear Thinning
Yield Stress
Yield stress
Pipe
Power Law

Keywords

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

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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Rheological and Flocculation Analysis of Microfibrillated Cellulose Suspension Using Optical Coherence Tomography. / Koponen, Antti I. (Corresponding Author); Lauri, Janne; Haavisto, Sanna; Fabritius, Tapio.

In: Applied Sciences, Vol. 8, No. 5, 755, 10.05.2018.

Research output: Contribution to journalArticleScientificpeer-review

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AU - Koponen, Antti I.

AU - Lauri, Janne

AU - Haavisto, Sanna

AU - Fabritius, Tapio

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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.

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KW - Microfibrillated cellulose

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