Key role of the hemicellulose content and the cell morphology on the nanofibrillation effectiveness of cellulose pulps

Chaker, Ashraf; Alila, Sabrine; Mutjé, Pere; Vilar, M. Rei; Boufi, Sami

doi:10.1007/s10570-013-0036-y

Cited by 163 publications

(102 citation statements)

References 18 publications

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“…This fact has been reported previously by several authors (Besbes et al 2011b;Chaker et al 2013;González et al 2014;DelgadoAguilar et al 2015a). Both the yield of nanofibrillation and the transmittance are much lower than for TEMPO-oxidized CNF, a fact that reveals that the morphology of the CNF from this study is substantially different (Besbes et al 2011a;González et al 2012González et al , 2014Delgado-Aguilar et al 2015a, d;Gamelas et al 2015).…”

Section: Resultssupporting

confidence: 86%

The feasibility of incorporating cellulose micro/nanofibers in papermaking processes: the relevance of enzymatic hydrolysis

et al. 2016

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Cellulose nanofiber (CNF) is becoming a topic of great interest among the industrial and academic communities, mainly due to their potential applications in very well-differentiated industrial sectors. Among this wide range of applications, papermaking is one of the most accepted and studied. However, it is widely known that the papermaking sector is forced to compete in markets where products do not have huge added value and production margins are very low. Therefore, papermakers are constantly looking for new technologies that balance efficiency and production costs. In line with this, the present work attempts to assay the enzymatic hydrolysis of cellulose fibers to obtain CNFs. Accordingly, pH, pulp consistency, treatment time, enzyme dosage and temperature were varied to find a combination of parameters that could lead to highly efficient CNF in terms of the mechanical properties of paper enhancement and production costs. For this, CNFs were applied to unrefined and refined bleached kraft pulps and their properties were assessed. The obtained results demonstrated that it is possible to obtain highly efficient CNFs from bleached pulp at affordable costs for papermakers. Moreover, it was found that the treatment time has a key role during the production of this CNF but at low enzyme dosages since the obtained results, in terms of intrinsic properties and reinforcing potential, for high enzyme charges did not vary significantly as time was increased. In sum, the present work offers a cost-efficient solution for the application of CNF in the production of paper from bleached pulp as well as a promising alternative to those conventional processes from a technical point of viewThe authors wish to acknowledge the financial support of the Economy and Competitiveness Ministry of the Government of Spain to project CTQ2013–48090–C2–2–R

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Section: Resultssupporting

confidence: 86%

The feasibility of incorporating cellulose micro/nanofibers in papermaking processes: the relevance of enzymatic hydrolysis

et al. 2016

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“…These observations on nanocellulose is consistent with the previous report that hemicellulose decreased the aggregation of the much larger microfibrils by disrupting interfibrillar hydrogen bonding. 14 Besides hemicelluloses and silica, the C6 aldehyde groups in TEMPO-oxidized nanofibrils may also affect the lyophilizationinduced self-assembling behaviors of CNFs and HCNFs. However, the aldehyde contents of CNF5-30 and HCNF5-30 were very low, at 0.32 and 0.23 mmol/g, respectively (Supporting Information), compared to the COOH/COO − content.…”

Section: Dimensions and Surface Carboxyl Content Ofmentioning

confidence: 99%

Surface and Structure Characteristics, Self-Assembling, and Solvent Compatibility of Holocellulose Nanofibrils

Hsieh

2015

ACS Appl. Mater. Interfaces

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Rice straw holocellulose was TEMPO-oxidized and mechanically defibrillated to produce holocellulose nanofibrils (HCNFs) at 33.7% yield (based on original rice straw mass), 4.6% higher yield than cellulose nanofibril (CNF) generated by the same process from pure rice straw cellulose. HCNFs were similar in lateral dimensions (2.92 nm wide, 1.36 nm thick) as CNF, but longer, less surface oxidized (69 vs 85%), and negatively charged (0.80 vs 1.23 mmol/g). HCNFs also showed higher affinity to hydrophobic surfaces than CNFs while still attracted to hydrophilic surfaces. By omitting hemicellulose/silica dissolution step, the two-step 2:1 toluene/ethanol extraction and acidified NaClO 2 (1.4%, pH 3−4, 70°C, 6 h) delignification process for holocellulose was more streamlined than that of pure cellulose, while the resulting amphiphilic HCNFs were more hydrophobic and self-assembled into much finer nanofibers, presenting unique characteristics for new potential applications.

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“…The treatment 61 results in substantial breakdown of the lignocellulosic structure, hydrolysis of the hemicellulosic 62 fraction, depolymerization of the lignin components and defibration. Compared with alternative 63 pre-treatment methods, the advantages of steam explosion include a significantly lower 64 environmental impact, lower capital investment and less hazardous process chemicals (Chaker, 65 Alila, Mutjé, Vilar & Boufi, 2013). 66…”

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confidence: 99%

Revalorization of sunflower stalks as novel sources of cellulose nanofibrils and nanocrystals and their effect on wheat gluten bionanocomposite properties

Fortunati

Luzi

Jiménez

et al. 2016

Carbohydrate Polymers

104

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Thomas, S.; Kenny, J.... (2016). Revalorization of sunflower stalks as novel sources of cellulose nanofibrils and nanocrystals and their effect on wheat gluten bionanocomposite properties. Carbohydrate Polymers. 149:357-368. doi:10.1016Polymers. 149:357-368. doi:10. /j.carbpol.2016. Novel gluten based bionanocomposites reinforced with cellulose nanofibrils (CNF) and cellulose 17 nanocrystals (CNC) extracted from sunflower stalks by a steam explosion treatment and a 18 hydrolysis procedure, respectively, were prepared by casting/evaporation. The extracted cellulose 19 nanomaterials, both CNC and CNF, were embedded in gluten matrix and their effect was 20 investigated. Morphological investigations highlighted that gluten based bionanocomposites 21showed a homogenous morphology, the absence of visible cellulose nanoreinforcements, and the 22 presence of holes for Gluten_CNF nanocomposites. Gluten_CNF showed a reduction of water 23 vapour permeability coefficients but the values are higher respect to gluten reinforced with CNC. 24This behaviour could be related to the ability of CNC to increase the tortuous path of gas molecules. 25Moreover, the results from thermal, mechanical and barrier properties confirmed the strong 26 interactions obtained between CNC and gluten matrix during the process. 1.Introduction 34The development and use of green resources represent new objectives for reducing gas emissions 35 and consequent pollution while, in this context, lignocellulosic materials represent renewable 36 resources for production of fuel ethanol from sugars. Among lignocellulosic materials, the use of 37 agricultural residues is of particular interest because it has also the benefit of disposal of 38 problematic solid wastes which usually do not have any economic alternative. 39Sunflowers have been considered as one of the major sustainable lignocellulosic materials used not 40 only to extract oils but also for producing biofuels as alternative to fossil fuels (Vaithanomsat, 41 Chuichulcherm & Apiwatanapiwat, 2009; Berglund, 2007). Sunflowers are renewable and are 42 cultivated in large quantities (about 30-35 million metric tons) around the world; while sunflower 43 seeds represent the fourth source of oil in the world, heads, stalks and leaves remain unutilized after 44 harvesting . These residues are not eco-45 friendly because after harvesting they are typically burnt under not well-controlled conditions 46 causing a negative environmental impact. Every year, the volume of sunflower residues produced in 47 the world represents a huge environmental impact with 3-7 tonnes of dry matter/ha (Díaz, Cara, 48Ruiz, Pérez-Bonilla & Castro, 2011; Vaithanomsat, Chuichulcherm & Apiwatanapiwat, 2009.). For 49 these reasons, the attention of the scientific community is now oriented to the revalorization of 50 wastes after sunflower harvesting, and currently the most common use of residual stalks is for 51 bioethanol production (Jung, Yu, Eom & Hong, 2013). However, sunflower residues could be used 52 also as precursors fo...

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Key role of the hemicellulose content and the cell morphology on the nanofibrillation effectiveness of cellulose pulps

Cited by 163 publications

References 18 publications

The feasibility of incorporating cellulose micro/nanofibers in papermaking processes: the relevance of enzymatic hydrolysis

The feasibility of incorporating cellulose micro/nanofibers in papermaking processes: the relevance of enzymatic hydrolysis

Surface and Structure Characteristics, Self-Assembling, and Solvent Compatibility of Holocellulose Nanofibrils

Revalorization of sunflower stalks as novel sources of cellulose nanofibrils and nanocrystals and their effect on wheat gluten bionanocomposite properties

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