Production of nanofibrillated cellulose with superior water redispersibility from lime residues via a chemical-free process
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Author list: Jongaroontaprangsee S., Chiewchan N., Devahastin S.
Publisher: Elsevier
Publication year: 2018
Journal: Carbohydrate Polymers (0144-8617)
Volume number: 193
Start page: 249
End page: 258
Number of pages: 10
ISSN: 0144-8617
eISSN: 1879-1344
Languages: English-Great Britain (EN-GB)
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Abstract
Water removal during drying of nanofibrillated cellulose (NFC) generally results in the formation of hydrogen bonds between fibers, leading to irreversible fiber agglomeration and hence their poor water redispersibility. The feasibility of using lime residues after juice extraction to produce dried NFC possessing superior redispersibility was here investigated. After autoclaving at 110–130 °C for 2 h, high-shear homogenization at 3800 × g for 15 min and high-pressure homogenization at 40 MPa for 5 passes, NFC having the diameters of 5–28 nm and crystallinity index of 44–46% could be obtained. After hot air drying at 60 °C, dried NFC could be well dispersed in water, with viscoelastic property similar to that of the originally prepared NFC suspension. Pectin associated with cellulose nanofibrils helped prevent fiber aggregation during drying and hence facilitating nanofiber redispersion in water. This observed trend was opposite to that belonging to fiber undergone chemical treatments to remove non-cellulosic constituents. © 2018 Elsevier Ltd
Keywords
Aggregation, Autoclaving, Homogenization, Nano fiber, Viscoelastic property
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