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Valorization of byproducts of hemp multipurpose crops: short non-aligned bast fibers as a source of nanocellulose

arXiv.org, 2021-05

2021. This work is published under http://creativecommons.org/licenses/by-nc-nd/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License. ;http://creativecommons.org/licenses/by-nc-nd/4.0 ;EISSN: 2331-8422 ;DOI: 10.48550/arxiv.2105.11742

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  • Title:
    Valorization of byproducts of hemp multipurpose crops: short non-aligned bast fibers as a source of nanocellulose
  • Author: Sara Dalle Vacche ; Karunakaran, Vijayaletchumy ; Patrucco, Alessia ; Zoccola, Marina ; Douard, Loreleï ; Ronchetti, Silvia Maria ; Gallo, Marta ; Schreier, Aigoul ; Leterrier, Yves ; Bras, Julien ; Beneventi, Davide ; Bongiovanni, Roberta
  • Subjects: Bleaching ; Cannabis ; Cellulase ; Hemp ; Infrared analysis ; Morphology ; Physics - Soft Condensed Matter ; Pretreatment ; Thermogravimetric analysis ; Ultrafines ; Vegetable fibers ; Wood pulp
  • Is Part Of: arXiv.org, 2021-05
  • Description: Nanocellulose was extracted from short bast fibers, from hemp (Cannabis Sativa L.) plants harvested at seed maturity, non-retted, mechanically decorticated in a defibering apparatus giving non-aligned fibers. A chemical pretreatment with NaOH and HCl allowed the removal of most of the non-cellulosic components of the fibers. No bleaching was performed. The chemically pretreated fibers were then refined in a beater and treated with a cellulase enzyme, before the mechanical defibrillation in an ultrafine friction grinder. The fibers were characterized by microscopy, infrared spectroscopy, thermogravimetric analysis, and X-ray diffraction after each step of the process, to understand the evolution of their morphology and composition. The obtained nanocellulose suspension was composed of rod-like fibrils with widths of 5-12 nm, stacks of nanofibrils with widths of 20-200 nm, and some larger fibers. The crystallinity index was found to increase from 74% for the raw fibers to 80% for the nanocellulose. The nanocellulose retained a yellowish color indicating the presence of some residual lignin. Properties of nanopaper prepared with the hemp nanocellulose were similar to those of nanopapers prepared with wood pulp derived rod-like nanofibrils.
  • Publisher: Ithaca: Cornell University Library, arXiv.org
  • Language: English
  • Identifier: EISSN: 2331-8422
    DOI: 10.48550/arxiv.2105.11742
  • Source: arXiv.org
    AUTh Library subscriptions: ProQuest Central
    Open Access: Freely Accessible Journals by multiple vendors
    ROAD: Directory of Open Access Scholarly Resources
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