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Cellulose

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Open Access 01.12.2012 | Original Paper

Flocculation of microfibrillated cellulose in shear flow

verfasst von: Anni Karppinen, Tapio Saarinen, Juha Salmela, Antti Laukkanen, Markus Nuopponen, Jukka Seppälä

Erschienen in: Cellulose | Ausgabe 6/2012

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Abstract

In this work, the rheological properties of microfibrillated cellulose suspensions under stepped flow and constant shear were studied using a combination of rotational dynamic rheometer and digital imaging. During each rheological measurement, the structure of the suspension was monitored through a transparent outer cylinder with a digital camera. This enabled simultaneous analysis of the suspension floc size distribution and traditional rheological characterization. In stepped flow conditions, a good correlation between suspension floc structure and flow curve measurement was found. At constant shear, the suspension structure was dependent on the shear rate and concentration of the suspension. A low shear rate resulted in heterogeneous floc structure, which was also detected by an increase in the ratio of the viscous component to elastic component in the rheological measurement. At low concentrations and 0.5 s⁻¹ shear rate, flow induced a formation of floc cylinders between the rotating cylinder and stationary cup surface.

Vorheriger Artikel Dynamics of cello-oligosaccharides on a cellulose crystal surface

Nächster Artikel Deformation of cellulose nanocrystals: entropy, internal energy and temperature dependence

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Titel: Flocculation of microfibrillated cellulose in shear flow
verfasst von: Anni Karppinen
Tapio Saarinen
Juha Salmela
Antti Laukkanen
Markus Nuopponen
Jukka Seppälä
Publikationsdatum: 01.12.2012
Verlag: Springer Netherlands
Erschienen in: Cellulose / Ausgabe 6/2012
Print ISSN: 0969-0239
Elektronische ISSN: 1572-882X
DOI: https://doi.org/10.1007/s10570-012-9766-5

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