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Effect of xylanase pretreatment of rice straw unbleached soda and neutral sulfite pulps on isolation of nanofibers and their properties
Cellulose and Paper Department, Centre of Excellence for Advanced Sciences, National Research Centre, Giza, Egypt; Egypt Nanotechnology Centre, Cairo University, El-Sheikh Zayed, City, Egypt.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0002-6247-5963
Cellulose and Paper Department, Centre of Excellence for Advanced Sciences, National Research Centre, Giza, Egypt.
Cellulose and Paper Department, Centre of Excellence for Advanced SciencesNational Research CentreGizaEgypt.
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2018 (English)In: Cellulose (London), ISSN 0969-0239, E-ISSN 1572-882X, Vol. 35, no 5, p. 2939-2953Article in journal (Refereed) Published
Abstract [en]

There is a recent interest in producing cellulose nanofibers with different surface properties from unbleached cellulose pulps for economic and environmental reasons. In the current study we investigated the use of xylanase pretreatment on two types of unbleached rice straw pulps, namely, soda and neutral sulfite, and their fibrillation to nanofibers using ultrafine grinding. The effect of xylanase pretreatment on the fibrillation progress, energy consumption, and nanofiber dimensions was studied. In addition, mechanical properties, water contact angle, water absorption, and roughness of produced nanopapers were studied. Although very thin nanofibers with a homogenous width could be isolated from both xylanase-treated and untreated pulps, the xylanase pretreatment resulted in faster fibrillation. In addition, nanopapers prepared from xylanase-treated nanofibers had better mechanical properties than those isolated from the untreated pulps. The energy consumption during fibrillation depended on the type of pulp; a slightly lower energy consumption (~ 8%) was recorded for xylanase-treated soda pulp while a higher energy consumption (~ 21%) was recorded for xylanase-treated neutral sulfite pulp compared to the untreated pulps.

Place, publisher, year, edition, pages
Springer, 2018. Vol. 35, no 5, p. 2939-2953
Keywords [en]
Rice straw, Soda pulp, Neutral sulfite pulp, Cellulose nanofibers, Nanopaper
National Category
Bio Materials
Research subject
Wood and Bionanocomposites
Identifiers
URN: urn:nbn:se:ltu:diva-68331DOI: 10.1007/s10570-018-1779-2ISI: 000431788000014OAI: oai:DiVA.org:ltu-68331DiVA, id: diva2:1197409
Note

Validerad;2018;Nivå 2;2018-05-24 (andbra)

Available from: 2018-04-12 Created: 2018-04-12 Last updated: 2018-05-24Bibliographically approved

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Berglund, LinnOksman, Kristiina

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