High-pressure homogenized citrus fiber cellulose dispersions
Structural characterization and flow behavior
M. R. Serial (Wageningen University & Research)
Evgenii Velichko (TU Delft - RST/Neutron and Positron Methods in Materials)
Tatiana Nikolaeva (Wageningen University & Research)
R. den Adel (Unilever Foods Innovation Centre)
C. Terenzi (Wageningen University & Research)
Wim Bouwman (TU Delft - RST/Neutron and Positron Methods in Materials)
John P.M. van Duynhoven (Wageningen University & Research, Unilever Foods Innovation Centre)
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Abstract
Functionalized biomass waste sources of cellulose have drawn attention due to their high availability and sustainability properties. In this work we characterize the structural and flow properties of high-pressure homogenized citrus fiber cellulose dispersions, employing SAXS, rheology and rheo-MRI techniques. The high-pressure treatment disrupts the microfibrillar network within the citrus fibers, but leaves the individual microfibrils intact. Under moderate shear (0.1-100 s-1) in a confined (<1 mm) geometry, these functionalized citrus fiber cellulose dispersions exhibit thixotropic shear-banding behavior accompanied by cooperative flow of microfibril flocs with correlation lengths ξ ~ 100 μm. The presented findings form a basis towards understanding and manipulating the structural and rheological properties of non-wood biomass cellulose microfibrils under industrially-relevant conditions.
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