Lignocellulosic Nanofiber from Eucalyptus Waste by a Green Process and Their Influence in Bionanocomposites

Silva, Cristina G. da; Kano, Fabiany Sayuri; Rosa, Derval dos Santos

doi:10.1007/s12649-019-00610-3

Cited by 27 publications

(22 citation statements)

References 46 publications

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“…As can be seen in diffractograms, in all the samples, peaks were found to be superimposed as a wide halo, due to the presence of an amorphous phase. In semicrystalline lignocellulosic polymers from softwood and vegetable fibers, this type of pattern is commonly observed [ 43 ].…”

Section: Resultsmentioning

confidence: 99%

Isolation and Characterization of Alpha and Nanocrystalline Cellulose from Date Palm (Phoenix dactylifera L.) Trunk Mesh

et al. 2021

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Highly pure cellulosic polymers obtained from waste lignocellulose offer great potential for designing novel materials in the concept of biorefinery. In this work, alpha-cellulose and nanocrystalline cellulose were isolated from the date palm trunk mesh (DPTM) through a series of physicochemical treatments. Supercritical carbon dioxide treatment was used to remove soluble extractives, and concentrated alkali pretreatment was used to eliminate the lignin portion selectively to obtain alpha-cellulose in approximately 94% yield. Further treatments of this cellulose yielded nanocrystalline cellulose. The structure–property relationship studies were carried out by characterizing the obtained polymers by various standard methods and analytical techniques such as Fourier transform infrared spectroscopy-attenuated total reflection (FTIR-ATR), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), energy dispersive X-ray diffraction (EDX-XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Almost 65% yield of pure cellulose was achieved, out of which 94% is the alpha-cellulose. This cellulose shows good thermal stability and crystallinity. The microscopic analysis of the nanocellulose showed a heterogeneous mix of irregular-shaped particles with a size range of 20–60 nm. The percentage crystallinity of alpha-cellulose and nanocellulose was found to be 68.9 and 71.8, respectively. Thus, this study shows that, this DPTM-based low-cost waste biomass can be a potential source to obtain cellulose and nano-cellulose.

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Section: Resultsmentioning

confidence: 99%

Isolation and Characterization of Alpha and Nanocrystalline Cellulose from Date Palm (Phoenix dactylifera L.) Trunk Mesh

et al. 2021

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“…Furthermore, CN extracted from pretreated lignocellulosic materials may retain moderate lignin contents, rendering nanomaterials with interesting physical and chemical properties. Nanocelluloses containing lignin or lignified nanocelluloses (LNC) are considerably less hydrophilic than lignin-free nanocelluloses, and this may improve their interaction with hydrophobic materials as well as their drying, transport and storage performances (Deepa et al 2019;Gu et al 2019;Silva et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Micro/nanostructured lignonanocellulose obtained from steam-exploded sugarcane bagasse

et al. 2021

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This work demonstrates the isolation of lignocellulose micro-nanofibrils, nanocrystals and nanospheres from steam-exploded sugarcane bagasse (SEB). First, steam-explosion was carried out in sugarcane bagasse at 195 °C for 7.5 and 15 min (SEB-7.5 and SEB-15). Untreated sugarcane bagasse was also pretreated by mechanical refining (MRB) in a PFI mill for comparison. Then, SEB and MRB fibers were submitted to alkaline delignification, hypochlorite bleaching for 60 or 180 min (HB60 and HB180), enzymatic hydrolysis (endoglucanase), and high-pressure homogenization. The resulting materials were characterized regarding chemical composition by high-performance liquid chromatography, width and morphology by transmission electron microscopy, crystallinity by X-ray powder diffraction and aspect ratio (length/diameter) by rheology. Levels of glucans (mostly cellulose), hemicelluloses and lignin were: 53.8%, 19.7% and 11.6% in MRB-HB180; 87.8%, <0.1% and 7.2% in SEB-7.5-HB60; 84.3%, <0.1% and 4.8% in SEB-7.5-HB180, 85.9%, <0.1% and 8.4% in SE-15-HB60; and 82.2%, <0.1% and 5% in SE-15-HB180, respectively. Aspect ratios and crystallinity indexes were similar among all groups (~100 and ~73%, respectively), except for SE-15-HB180 (~ 78.5 and 77%, respectively). MRB-HB180 and SE-15 (HB60 and HB180) had the lowest fiber widths (<20 nm) with the presence of nanocrystals in SE-15-HB180, while in the SE-7.5 (HB60 and HB180), fiber widths were greater than 50 nm with the presence of lignin nanospheres in SE-7.5-HB60. Hence, lignocellulose nanomaterials with aspect ratios ranging from micro/nanofibers to nanocrystals were isolated from SEB using a cost-effective production process.

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Section: Nonmodification Interface Engineeringmentioning

confidence: 99%

“…[ 246 ] The improvement of mechanical properties after incorporation of LCNF into poly (butylene adipate‐co‐terephthalate) and PP have also been observed. [ 215,248,249 ] In terms of advanced functional properties, LCNFs bestowed antioxidant characteristic, highly optical transparency, strong UV‐absorbing capability to the PVA matrix composite. [ 250,251 ] In particular, at only 10 wt% LCNFs, the PVA composite transmitted ≈50% (on average), <10% and 2–6% light in the UV‐A (315−400 nm), UV‐B (280−315 nm), and UV‐C (200–280 nm) regions, respectively (Figure 13g).…”

Section: Nonmodification Interface Engineeringmentioning

confidence: 99%

Surface and Interface Engineering for Nanocellulosic Advanced Materials

et al. 2020

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How do trees support their upright massive bodies? The support comes from the incredibly strong and stiff, and highly crystalline nanoscale fibrils of extended cellulose chains, called cellulose nanofibers. Cellulose nanofibers and their crystalline parts—cellulose nanocrystals, collectively nanocelluloses, are therefore the recent hot materials to incorporate in man‐made sustainable, environmentally sound, and mechanically strong materials. Nanocelluloses are generally obtained through a top‐down process, during or after which the original surface chemistry and interface interactions can be dramatically changed. Therefore, surface and interface engineering are extremely important when nanocellulosic materials with a bottom‐up process are fabricated. Herein, the main focus is on promising chemical modification and nonmodification approaches, aiming to prospect this hot topic from novel aspects, including nanocellulose‐, chemistry‐, and process‐oriented surface and interface engineering for advanced nanocellulosic materials. The reinforcement of nanocelluloses in some functional materials, such as structural materials, films, filaments, aerogels, and foams, is discussed, relating to tailored surface and/or interface engineering. Although some of the nanocellulosic products have already reached the industrial arena, it is hoped that more and more nanocellulose‐based products will become available in everyday life in the next few years.

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Lignocellulosic Nanofiber from Eucalyptus Waste by a Green Process and Their Influence in Bionanocomposites

Cited by 27 publications

References 46 publications

Isolation and Characterization of Alpha and Nanocrystalline Cellulose from Date Palm (Phoenix dactylifera L.) Trunk Mesh

Isolation and Characterization of Alpha and Nanocrystalline Cellulose from Date Palm (Phoenix dactylifera L.) Trunk Mesh

Micro/nanostructured lignonanocellulose obtained from steam-exploded sugarcane bagasse

Surface and Interface Engineering for Nanocellulosic Advanced Materials

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