6533b7d8fe1ef96bd1269a75

RESEARCH PRODUCT

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

Tapio FabritiusSanna HaavistoJanne LauriAntti Koponen

subject

Rheometershear viscosity; yield stress; flocculation; velocity profile; microfibrillated cellulose; cellulose microfibrils; optical coherence tomographyCellulose microfibrils02 engineering and technologylcsh:Technology01 natural scienceslcsh:Chemistrychemistry.chemical_compoundVelocity profileShear viscosityGeneral Materials ScienceComposite materiallcsh:QH301-705.5InstrumentationFluid Flow and Transfer ProcessesShear thinningta213Drop (liquid)General Engineering021001 nanoscience & nanotechnologylcsh:QC1-999Computer Science ApplicationsMicrofibrillated cellulose0210 nano-technologyFlocculationMaterials scienceselluloosa010402 general chemistrysuspensiotRheologyShear stressFluidizationCelluloseta216Yield stressta114Optical coherence tomographylcsh:TProcess Chemistry and TechnologyviskositeettiFlocculationoptinen koherenssitomografia0104 chemical scienceslcsh:Biology (General)lcsh:QD1-999chemistrylcsh:TA1-2040lcsh:Engineering (General). Civil engineering (General)lcsh:Physics

description

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. peerReviewed

yearjournalcountryeditionlanguage
2018-05-10Applied Sciences
https://doi.org/10.3390/app8050755