A novel energy-efficient method called nanopulping (patent pending) to produce nanocellulose from chemical pulp, and a
novel cross-flow ultra-filtration method to separate nanofibrils fractions of different size were applied in this study. Pretreatment with endoglucanase
or 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) oxidation seems to enhance the nanopulping process. Results were evaluated
with atomic force microscope and ultrafiltration. The nanopulping produced a relatively inhomogeneous material with larger particles/
fibers in addition to nanofibers. However, by ultrafiltration of the material it was possible to obtain more homogeneous material in
different dimensions with methods industrially acceptable.
Keywords: Cross flow ultra-filtration, Endoglucanase pretreatment, Microfibrillated cellulose, Nanocellulose, Nanopulping, TEMPO pretreatment.
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