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

5 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

Keywords

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

Fingerprint Dive into the research topics of 'Rheological and Flocculation Analysis of Microfibrillated Cellulose Suspension Using Optical Coherence Tomography'. Together they form a unique fingerprint.

  • Cite this