Abstract
One of the main manufacturing challenges is to obtain dried cellulose nanofibrils (CNFs) so that they can be cost effectively transported to customers. This work presents a study on using two methods of drying: freeze drying and spray drying; these dried CNFs were then characterized. The dried CNFs from either freeze drying or spray drying could not recover their original state after simple re-dispersion in water. Compared to spray dried CNFs, the microstructure of the freeze dried CNFs remained in a better shape. This was because the packing of nanofibrils as a result of freeze drying was not as tight as that from spray drying. It was demonstrated by the lower final mass residue and crystallinity of the freeze-dried CNFs, which led to better re-dispersion in water. X-ray diffractometry proved the occurrence of aggregation/hornification of the dried CNFs with increased crystallinity. Time-dependent sedimentation confirmed that the dried CNFs were incapable of forming stable water-re-dispersible suspensions.
Funding statement: The authors gratefully acknowledge financial support from Demonstration of Hemicellulose Extraction Technology from Pulping Hydrolysate and Xylose Preparation (2017YFB0307904), the team project of Pulp and Environment Technology R&D Center at China National Pulp and Paper Research Institute Co., Ltd.
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© 2021 Walter de Gruyter GmbH, Berlin/Boston, Germany
Artikel in diesem Heft
- Contents
- Original
- Development of an accelerated test for pitting corrosion of CUSTOM 450 by rDHM
- Intergranular corrosion susceptibility of 6061 aluminum alloy welded joints
- Preparation and characterization of dried cellulose nanofibrils
- Effects of impregnating PTFE filled with added graphite on wear behavior of sintered bronze plain bearings
- Theoretical investigations on correlations between elastic behavior of Al-based alloys and their electronic structures
- The effect of homogenization on microstructure and hardness of a large-scale high-aluminum Al4.4Co26Cr18Fe18Ni26Ti5.5 Compositionally Complex Alloy cast
- Role of Ti and Y in the nucleation of the primary α-Al of Al7075–Ti–Y natural composites and influence of ultrasonic vibration
- Review
- Synthesis and characterizations of metal ions doped barium strontium titanate (BST) nanomaterials for photocatalytic and electrical applications: A mini review
- Notifications
- Deutsche Gesellschaft für Materialkunde / German Materials Science Society
Artikel in diesem Heft
- Contents
- Original
- Development of an accelerated test for pitting corrosion of CUSTOM 450 by rDHM
- Intergranular corrosion susceptibility of 6061 aluminum alloy welded joints
- Preparation and characterization of dried cellulose nanofibrils
- Effects of impregnating PTFE filled with added graphite on wear behavior of sintered bronze plain bearings
- Theoretical investigations on correlations between elastic behavior of Al-based alloys and their electronic structures
- The effect of homogenization on microstructure and hardness of a large-scale high-aluminum Al4.4Co26Cr18Fe18Ni26Ti5.5 Compositionally Complex Alloy cast
- Role of Ti and Y in the nucleation of the primary α-Al of Al7075–Ti–Y natural composites and influence of ultrasonic vibration
- Review
- Synthesis and characterizations of metal ions doped barium strontium titanate (BST) nanomaterials for photocatalytic and electrical applications: A mini review
- Notifications
- Deutsche Gesellschaft für Materialkunde / German Materials Science Society