Nanofibers from bagasse and rice straw: process optimization and properties

Hassan, Mohammad L.; Mathew, Aji P.; Hassan, Enas A.; El-Wakil, Nahla A.; Oksman, Kristiina

doi:10.1007/s00226-010-0373-z

Cited by 155 publications

(68 citation statements)

References 25 publications

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“…These particles could reduce the hydrogen bonding between the nanofibrils and act as ''stress raisers'', and could thus adversely affect the strength of the sheet. Hassan et al (2012) also reported the existence of silica contaminants in the dispersion of rice straw fibrils, which adversely effected the mechanical properties of the film produced from rice straw fibrils. The overall toughness of T. pungens derived NFC sheet (area under the tensile curve) is impressive and higher than that from the other reported sources (Ferrer et al 2012b;Henriksson and Berglund 2007;Sehaqui et al 2011a, b;Svagan et al 2007) which could be associated with high hemicellulose content which is beneficial for imparting toughness and flexibility to NFC sheet (Amiralian et al 2015;Bourree et al 2004;Chen et al 2011a).…”

Section: Crystallinity Of Cellulose Nanofibrils From T Pungensmentioning

confidence: 94%

Isolation of cellulose nanofibrils from Triodia pungens via different mechanical methods

et al. 2015

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Triodia pungens is one of the 69 species of an Australian native arid grass which covers approximately 27 % of the Australian landmass. In this study, we report that very long and thin cellulose nanofibrils can readily be isolated from Triodia pungens biomass using unrivalled mild chemical pulping, followed by several mechanical fibrillation methods. After a typical pulping process which includes washing, delignification and bleaching steps, mechanical fibrillation was performed via high pressure homogenization, ultrasonication and high energy ball milling using relatively minimal energy in all approaches. Cellulose nanofibrils with an average diameter of below 10 nm and a length of several microns were obtained. It also has been shown that the nanofibrils obtained from Triodia pungens have a crystallinity index of about 69 %, and a thermal stability of up to 320°C. The sheets produced from high aspect ratio nanofibrils prepared by high pressure homogenization, also demonstrated a very high work at fracture. By evaluating the deconstruction strategies and the performance of nanofibril sheets, we report that the highperformance cellulose nanofibrils can be processed from arid grass bleached pulp with unusually low energy input.

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Section: Crystallinity Of Cellulose Nanofibrils From T Pungensmentioning

confidence: 94%

Isolation of cellulose nanofibrils from Triodia pungens via different mechanical methods

et al. 2015

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“…In solid state, the cellulose fibers consist of highly ordered microcrystalline structures called ''crystalline regions'' that alternate with much less ordered structures known as ''amorphous regions''. Cellulosic nanofibers are widely utilized as biobased nanoreinforcement in various polymer matrices owing to their superior mechanical properties (Seydibeyoglu and Oksman 2008;Nakagaito and Yano 2004;Iwatake et al 2008;Oksman et al 2009;Hassan et al 2011). Cellulose based materials such as cellulose sponge, cellulose acetate etcetera are found to induce negligible foreign body and inflammatory responses and are therefore considered to be biocompatible (Miyamoto et al 1989;Märtson et al 1998).…”

Section: Introductionmentioning

confidence: 99%

Crosslinked fibrous composites based on cellulose nanofibers and collagen with in situ pH induced fibrillation

Mathew

Oksman

Pierron³

et al. 2011

Cellulose

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Collagen and cellulose nanofiber based composites were prepared by solution casting followed by pH induced in situ partial fibrillation of collagen phase and crosslinking of collagen phase using gluteraldehyde. Microscopy studies on the materials confirmed the presence of fibrous collagen and cellulose nanofibers embedded in the collagen matrix. The cellulose nanofiber addition as well as collagen crosslinking showed significant positive impact on the nanocomposite's mechanical behaviour. The synergistic performance of the nanocomposites indicated stabilization and reinforcement through strong physical entanglement between collagen and cellulose fibres as well as chemical interaction between collagen matrix and collagen fibrils. The mechanical performance and stability in moist conditions showed the potential of these materials as implantable scaffolds in biomedical applications.The collagen-cellulose ratio, crosslinking agent and crosslinking level of collagen may be further optimised to tailor the mechanical properties and cytocompatibility of these composites for specific applications such as artificial ligament or tendon.

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“…Cellulose nanofibrils have been prepared from a variety of sources using several mechanical processes [11][12][13] such as ultrasonication 14 . Chemical or enzymatic treatments can be employed before or after the mechanical process 9,10,15 .…”

Section: Introductionmentioning

confidence: 99%

Nanocellulose Produced from Rice Hulls and its Effect on the Properties of Biodegradable Starch Films

et al. 2016

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Rice hull is a residue from agro-industry that can be used to produce nanocellulose. We produced nanocellulose from rice hulls through bleaching (with a 5% NaOH solution followed by a peracetic acid solution) and acid hydrolysis at a mild temperature (45ºC) followed by ultrasonication. We investigated the microstructure, crystallinity and thermal stability of these materials and studied their effects on the properties of starch films. After bleaching, the compact structure around the cellulosic fibers was removed, and the lignin content of the residue decreased from 7.22 to 4.22%. The obtained nanocellulose presented a higher crystallinity (up 70%), higher thermal stability than the raw material and lignin contents below 0.35%. The nanocellulose formed interconnected webs of tiny fibers (< 100 nm in diameter), which decreased the opacity, water vapor permeability and improved the mechanical properties when added as reinforcement in the starch films.

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Nanofibers from bagasse and rice straw: process optimization and properties

Cited by 155 publications

References 25 publications

Isolation of cellulose nanofibrils from Triodia pungens via different mechanical methods

Isolation of cellulose nanofibrils from Triodia pungens via different mechanical methods

Crosslinked fibrous composites based on cellulose nanofibers and collagen with in situ pH induced fibrillation

Nanocellulose Produced from Rice Hulls and its Effect on the Properties of Biodegradable Starch Films

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