The influence of the cellulose hydrolysis process on the structure of cellulose nanocrystals extracted from capim mombaça ( Panicum maximum )

Martins, Douglas Ferreira; Souza, Alexandre Bernaldino de; Henrique, Mariana Alves; Silvério, Hudson Alves; Neto, Wilson Pires Flauzino; Pasquini, Daniel

doi:10.1016/j.indcrop.2014.10.035

Cited by 46 publications

(30 citation statements)

References 43 publications

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“…It should be noted that longer hydrolysis times led to the isolation of smaller CNC in terms of their diameter and length. The same trend has been recently reported for CNC extracted from capim mombaça [32]. The aspect ratio of CNC is an important parameter, especially when CNC are intended as a nanoreinforcing fillers for polymer nanocomposites.…”

Section: Tem Observations Of Cncsupporting

confidence: 85%

“…The decrease of the CNC yield with increasing of hydrolysis time has been previously reported for the extraction of CNC from raw cellulose-rich materials [26,27,32]. Comparatively, with regard to the starting raw materials, the yield of the as-isolated CNC was higher than that of the CNC isolated from rice straw (4.83-6.43%) [33], and red algae (Gelidium elegans) (8.07%) [10].…”

Section: Elemental Analysis and Isolation Of Cncmentioning

confidence: 52%

“…This finding was expected since various studies have shown that the insertion of sulfate groups, during sulfuric acid hydrolysis, lowers the thermal stability of CNC [24,26]. The presence of sulfate groups on the surface of the CNC has a catalytic effect in the thermal decomposition mechanism [32], which results in a reduced thermal stability for sulfuric acid hydrolyzed CNC. It is noteworthy that the increase of hydrolysis time has a large effect on the Tonset and the Tmax of the isolated CNC.…”

Section: Thermogravimetric Analysis Of Cellulosic Materialsmentioning

confidence: 79%

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Reuse of red algae waste for the production of cellulose nanocrystals and its application in polymer nanocomposites

Achaby

Kassab

Aboulkas

et al. 2018

International Journal of Biological Macromolecules

187

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phone (+2126) 620 10 620 Highlights  Cellulose nanocrystals (CNC) were successfully extracted from red algae waste  CNC exhibit a needle-like shape and a diameter of 5-9 nm, and a length of 289-315 nm  PVA nanocomposite films with different CNC contents were prepared by solvent-casting  Nanocomposites with high mechanical performance and good transparency were obtaine Version postprintComment citer ce document : El Achaby, M., Kassab, Z., Aboulkas, A., Gaillard, C., AbstractRed algae is widely available around the world and its exploitation for the production of agar products has become an important industry in recent years. The industrial processing of red algae generates a large quantity of solid fibrous wastes, which constitutes a source of serious environmental problems. In the present work, the utilization of red algae waste as raw material to produce high-quality cellulose nanocrystals (CNC) has been investigated, and the ability of the as-isolated CNC to reinforce polymer has been studied. Red algae waste was chemically treated via alkali, bleaching and acid hydrolysis treatments, in order to obtain pure cellulose microfibers and CNC. The raw waste and the as-extracted cellulosic materials were successively characterized at different stages of treatments using serval analysis techniques. It was found that needle-like shaped CNC were successfully isolated at nanometric scale with diameters and lengths ranged from 5.2 ± 2.9 to 9.1 ± 3.1 nm, and from 285.4 ± 36.5 to 315.7 ± 30.3 nm, respectively, and the crystallinity index ranged from 81 to 87 %, depending on the hydrolysis time (30, 40 and 80 minutes). The as-extracted CNC were used as nanofillers for the production of polyvinyl alcohol (PVA)-based nanocomposite films with improved thermal and tensile properties, as well as optical transparency. It is shown that the addition of 8 wt % CNC into the PVA matrix increased the Young's modulus by 215 %, the tensile strength by 150 %, and the toughness by 45 %. Additionally, the nanocomposite films maintained the same transparency level of the neat PVA film (transmittance of ∼90% in the visible region), suggesting that the CNC were dispersed at the nanoscale.

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Section: Tem Observations Of Cncsupporting

confidence: 85%

Section: Elemental Analysis and Isolation Of Cncmentioning

confidence: 52%

Section: Thermogravimetric Analysis Of Cellulosic Materialsmentioning

confidence: 79%

See 1 more Smart Citation

Reuse of red algae waste for the production of cellulose nanocrystals and its application in polymer nanocomposites

Achaby

Kassab

Aboulkas

et al. 2018

International Journal of Biological Macromolecules

187

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“…Yield of pure cellulose from 7.77 g of G. glabra sample was recorded as 4.0 g. This value was found close to the values reported in previous cellulose isolation literature; 29-30% for hard wood, 37 32.8% for raw rice husk, 34 33.98% for capimmombaca (Panicum maximum), 28 49.43% for blue agave FIGURE 2. X-ray diffraction profiles of cellulose extracted from the roots of Glycyrrhiza glabra and commercial cellulose.…”

Section: Cellulose Contentsupporting

confidence: 87%

“…28 The peak at 999.29 cm À1 corresponds to C-O and ring stretching modes. A minor peak at 897 cm À1 demonstrates the typical structure of cellulose due to b-glycoside linkages of glucose ring of cellulose.…”

mentioning

confidence: 99%

Determination of Bovine Serum Albumin Adsorption Capacity of Newly Obtained Cellulose extracted from Glycyrrhiza glabra (Licorice)

2016

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Exploration of biodegradable and renewable composites ingredients is of great importance. Up to now, roots extract of Glycyrrhiza glabra has been used for different medicinal purposes but remaining cellulose-rich residues have not been evaluated for isolation of any green materials like cellulose. Here in this study, cellulose was successfully isolated from the roots of G. glabra by using conventional cellulose extraction method. The obtained product was characterized using FT-IR, XRD, and SEM. FT-IR and XRD analyses confirmed the identity of the product. The crystallinity index of cellulose isolates was calculated from XRD data as 70%. The cellulose content of the roots on dry basis was recorded as 48.5%. Three types of surface morphologies were observed: smooth non-porous surface, surface with fibril bundles, and porous surface having thin cellulose fibrils. In addition, bovine serum albumin (BSA) adsorption capacity of G. glabra cellulose was determined and compared with that of commercial cellulose. Newly obtained cellulose from the roots of G. glabra exhibited a higher affinity for BSA protein at neutral pH.

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Cellulose Nanocrystals as a Sustainable Raw Material: Cytotoxicity and Applications on Healthcare Technology

Pelegrini

Ré

Oliveira

et al. 2019

Macro Materials & Eng

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Cellulose nanocrystals (CNCs) are an environmentally friendly natural material, consisting of rod‐like crystalline nanoparticles, called whiskers, or nanocrystalline cellulose. The derivation of different natural sources, aligned to their biocompatibility, biodegradability, and versatility, make them a class of fascinating materials with widespread industrial use. In addition, the cellulose species possess intriguing physicochemical and mechanical properties. This paper provides an overview of recent progress in the area of cellulosic nanocomposites, along with details of their structure and liquid crystalline behavior as nematic and cholesteric lyotropic materials. Guidance is subsequently provided for the physicochemical analysis of these materials, including X‐ray diffraction, transmission electron microscopy, optical evaluation, thermogravimetric analysis, and differential scanning calorimetry. Additionally, the functional chemical and physical properties of CNCs are correlated to the resulting nanotoxicity in in vitro and in vivo assays. This review points to relevant concerns, such as sources for the synthesis of CNCs, the nanomaterial size, and the surface chemistry, that must be overcome in order to attain safe use of CNC‐based nanomaterials. The challenging perspectives on the ongoing research are presented in order to explore the technological and industrial perspectives on the use of CNC for the generation of cost‐effective advanced nanomaterials based on cellulosic fibers.

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The influence of the cellulose hydrolysis process on the structure of cellulose nanocrystals extracted from capim mombaça ( Panicum maximum )

Cited by 46 publications

References 43 publications

Reuse of red algae waste for the production of cellulose nanocrystals and its application in polymer nanocomposites

Reuse of red algae waste for the production of cellulose nanocrystals and its application in polymer nanocomposites

Determination of Bovine Serum Albumin Adsorption Capacity of Newly Obtained Cellulose extracted from Glycyrrhiza glabra (Licorice)

Cellulose Nanocrystals as a Sustainable Raw Material: Cytotoxicity and Applications on Healthcare Technology

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