Chemically extracted nanocellulose from sisal fibres by a simple and industrially relevant process

Abstract

12A novel type of acetylated cellulose nanofibre (CNF) was extracted successfully from sisal fibres using 13 chemical methods. Initially, a strong alkali treatment was used to swell the fibres, followed by a bleaching step

Valorization of Colombian fique (Furcraea bedinghausii) for production of cellulose nanofibers and its application in hydrogels

“…al 50 , agglomeration generally depends on Van der Waals attractive forces among nanoparticles. These results are comparable in variability to the report by Trifol et al 51 where fique nanofibers production with a diameter of 27.0 nm and length of 658 nm is reported.…”

“…4). It is observed that the treatment with H 2 SO 4 process combined with ultrasound leads to fibers individualization to diameters smaller than 100 nm, which initially 48,49 where it is argued that to be considered nanofibers they must have a diameter between 10 to 100 nm while length ranges between 100 and 1,000 nm.…”

Acetylation improves thermal stability and transmittance in FOLED substrates based on nanocellulose films

“…16 Among these methods, acetylation is one of the most promising due to the fact that the chemicals used in the process are very common and not particularly expensive. 17,18 The hydroxyl groups of the glucose groups on NFC are replaced by acetyl groups during the modication process, and the interaction forces between the bers are reduced, enhancing the NFC hydrophobic and dispersion properties, as well as its compatibility with other polymers. 19 Furthermore, acetylation is also used to improve the thermal degradation of the cellulose bers and the optical properties of the nanocellulose composite lms.…”

Recent advances in 3D printing of nanocellulose: structure, preparation, and application prospects

“…[42][43][44] With the elimination of amorphous hemicellulose and lignin to overcome cellulose recalcitrance, the crystallinity of extracted cellulosic material should expect a higher degree of crystallinity. X-ray diffraction (XRD) analysis at two angles of 2Ɵ values around 16 o and 22.8 o that correspond to (101) and (200) planes in the native cellulose crystal indicates relative crystallinity at 84.2 % for sisal fibers, 43 93 % for the rice and oat husks, and finally 72 % for fruit shells, 44 Correspondingly, a high 77 % crystallinity is revealed by Marino et al regarding the preparation method of cellulose nanomaterials from orange bagasse with multistep 2% NaOH treatment. 45 On the contrary, a longer period of exposing the biomass in alkaline pre-treatment solution of high concentration can potentially lead to a slight discount in crystallinity as the crystalline cellulose structure is disrupted and degraded.…”