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Nanocelluloses: A New Family of Nature-Based Materials
KTH, School of Engineering Sciences (SCI), Centres, VinnExcellence Center BiMaC Innovation.
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2011 (English)In: Angewandte Chemie International Edition, ISSN 1433-7851, E-ISSN 1521-3773, Vol. 50, no 24, 5438-5466 p.Article, review/survey (Refereed) Published
Abstract [en]

Cellulose fibrils with widths in the nanometer range are nature-based materials with unique and potentially useful features. Most importantly, these novel nanocelluloses open up the strongly expanding fields of sustainable materials and nanocomposites, as well as medical and life-science devices, to the natural polymer cellulose. The nanodimensions of the structural elements result in a high surface area and hence the powerful interaction of these celluloses with surrounding species, such as water, organic and polymeric compounds, nanoparticles, and living cells. This Review assembles the current knowledge on the isolation of microfibrillated cellulose from wood and its application in nanocomposites; the preparation of nanocrystalline cellulose and its use as a reinforcing agent; and the biofabrication of bacterial nanocellulose, as well as its evaluation as a biomaterial for medical implants.

Place, publisher, year, edition, pages
2011. Vol. 50, no 24, 5438-5466 p.
Keyword [en]
cellulose, nanocellulose, nanomaterials, nature-based materials, polymers
National Category
Nano Technology
URN: urn:nbn:se:kth:diva-159215DOI: 10.1002/anie.201001273ISI: 000291997000004ScopusID: 2-s2.0-79958021496OAI: diva2:783347

QC 20150126

Available from: 2015-01-26 Created: 2015-01-26 Last updated: 2015-01-26Bibliographically approved
In thesis
1. Microfibrillated cellulose: Energy-efficient preparation techniques and applications in paper
Open this publication in new window or tab >>Microfibrillated cellulose: Energy-efficient preparation techniques and applications in paper
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This work describes three alternative processes for producing microfibrillated cellulose (MFC; also referred to as cellulose nanofibrils, CNF) in which bleached pulp fibres are first pretreated and then homogenized using a high-pressure homogenizer. In one process, fibre cell wall delamination was facilitated by a combined enzymatic and mechanical pretreatment. In the two other processes, cell wall delamination was facilitated by pretreatments that introduced anionically charged groups into the fibre wall, by means of either a carboxymethylation reaction or irreversibly attaching carboxymethylcellulose (CMC) to the fibres. All three processes are industrially feasible and enable energy-efficient production of MFC. Using these processes, MFC can be produced with an energy consumption of 500–2300 kWh/tonne. These materials have been characterized in various ways and it has been demonstrated that the produced MFCs are approximately 5–30 nm wide and up to several microns long.

The MFCs were also evaluated in a number of applications in paper. The carboxymethylated MFC was used to prepare strong free-standing barrier films and to coat wood-containing papers to improve the surface strength and reduce the linting propensity of the papers. MFC, produced with an enzymatic pretreatment, was also produced at pilot scale and was studied in a pilot-scale paper making trial as a strength agent added at the wet-end for highly filled papers.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2015. 63 p.
TRITA-CHE-Report, ISSN 1654-1081 ; 2015:5
Microfibrillated cellulose, microfibrillar cellulose, nanofibrillated cellulose, nanofibrillar cellulose, cellulose nanofibrils, nanocellulose, MFC, NFC, CNF, production techniques, energy efficient, gel properties, films, enzymes, carboxymethylation, carboxymethyl cellulose, CMC, mechanical properties, oxygen barrier, homogenization, linting, papermaking
National Category
Paper, Pulp and Fiber Technology
Research subject
Fibre and Polymer Science
urn:nbn:se:kth:diva-159222 (URN)978-91-7595-426-4 (ISBN)
Public defence
2015-02-27, F3, Lindstedtsvägen 26, KTH, Stockholm, 10:00 (English)

QC 20150126

Available from: 2015-01-26 Created: 2015-01-26 Last updated: 2015-01-28Bibliographically approved

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