Bio‐nanocomposite films based on cellulose nanocrystals filled polyvinyl alcohol/chitosan polymer blend

Miri, Nassima El; Abdelouahdi, Karima; Zahouily, Mohamed; Fihri, Aziz; Barakat, Abdellatif; Solhy, Abderrahim; Achaby, Mounir El

doi:10.1002/app.42004

Cited by 164 publications

(110 citation statements)

References 65 publications

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“…Figure 4, all extracted CNC samples exhibited lower Tonset and Tmax compared to other cellulosic materials (AW, ATAW and BAW). 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.…”

Section: Thermogravimetric Analysis Of Cellulosic Materialsmentioning

confidence: 80%

“…Additionally, the CrI increased from 66 % for bleached sample to 81, 83 and 87 % for 17 observations. Herein, the as-isolated CNC shows a high CrI (81-87%) compared with the CNC which were extracted from red algae (73%) [10], mulberry (73.4%) [46] , or sugarcane bagasse (77-65 %) [23,24].…”

Section: X-ray Diffraction Analysismentioning

confidence: 97%

“…CNC were successfully extracted from AW by alkali and bleaching treatments followed by an acid hydrolysis process, as described in our previous works [23,24,29]. The as-received AW samples were first cut into small pieces (≤ 2 cm), which were ground using a precision grinder …”

Section: Production Of Cellulose Fibersmentioning

confidence: 99%

“…After washing with hot water, the ground AW fibers were subjected to an alkali treatment in order to eliminate the non-cellulosic compound (lignin, hemicellulose and pectin), which results in a yellow colored alkali-treated algae waste (ATAW) fibers ( Figure 1). These ATAW fibers were partially dissociated due to the breakage of certain alkali-labile linkages between lignin monomers or between lignin and polysaccharides [24]. Next, ATAW fibers were subjected to a bleaching treatment in order to remove the lignin and impurities that remain after the alkaline treatment.…”

Section: Elemental Analysis and Isolation Of Cncmentioning

confidence: 99%

“…alkali, bleaching and sulfuric acid hydrolysis treatments [23][24][25]. CNC were extracted at various hydrolysis times (30, 40 and CNC.…”

Section: Introductionmentioning

confidence: 99%

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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

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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: Thermogravimetric Analysis Of Cellulosic Materialsmentioning

confidence: 80%

Section: X-ray Diffraction Analysismentioning

confidence: 97%

Section: Production Of Cellulose Fibersmentioning

confidence: 99%

Section: Elemental Analysis and Isolation Of Cncmentioning

confidence: 99%

“…alkali, bleaching and sulfuric acid hydrolysis treatments [23][24][25]. CNC were extracted at various hydrolysis times (30, 40 and CNC.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

Self Cite

187

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Chiral Cellulose Nanocrystals with Intercalated Amorphous Polysaccharides for Controlled Iridescence and Enhanced Mechanics

Adstedt

Popenov

Pierce

et al. 2020

Adv Funct Materials

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A unique case of combined enhanced mechanical performance and tunable structural color for chiral composites from cellulose nanocrystals (CNCs) arises by adding nanofibrillar wood-derived polymers with similar chemical compositions. When amorphous polysaccharides (pullulan, dextran, and xylan) are added, they intercalate seamlessly into the original helicoidal organization via interstitial volumes within nanocrystals and between nematic monolayers. The polysaccharides fill the available free volume in between packed nanocrystals until 40 wt% content is reached, with no phase separation occurring. Due to the inter-nanocrystal intercalation, these natural polysaccharide-cellulose composites show a nearly twofold increase in toughness and modulus. Beyond improved mechanics, the preserved iridescence shows a dramatic red shift from blue to near-infrared region, expanding the initial pitch length without disturbing the long-range chiral ordering. In the mechanistic model suggested here, the individual backbones first form intercalated morphologies in the interstitial volumes between tightly packed nanocrystals. After this, the polysaccharides form a monolayer, and eventually double layer, between nanocrystal monolayers, thus incrementally "unwinding" initial chiral organization. The resulting CNC-polysaccharide films maintain their vivid iridescence with broad color appearance and are among the first entirely biobased composites to maintain iridescence with improved mechanics.

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Multimodal Wrinkle Micro‐Nanoarchitectonics by Patterned Surface Material Properties for Transformative Structural Coloration

Park

Jeong

et al. 2023

Advanced Optical Materials

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When an external stimulus is used to generate nanoscale wrinkles on the ductile top surface of a multilayered substrate, the geometrical and optical features are known to be controlled by the material and structural properties of the laminated film. Herein, a thin tri‐layer film is fabricated that can generate various wrinkles on transparent and flexible films in the presence of external mechanical bending. In particular, the wavelength of the wrinkles is shown to be controllable on the tens of nanometers scale by modulating the material properties of each layer. This active modulation plays a critical role in determining the resulting structural color spectra. In other words, the wrinkles function as a diffraction grating so that the film displays bright structural colors under bending conditions. After the bending stress is released, the wrinkles disappear, and the film returns to its transparent state. Finally, the remarkable potential of the material and structural patterning technique is demonstrated for structural coloration applications such as multimodal displays and novel barcode‐based anti‐counterfeiting.

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Bio‐nanocomposite films based on cellulose nanocrystals filled polyvinyl alcohol/chitosan polymer blend

Cited by 164 publications

References 65 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

Chiral Cellulose Nanocrystals with Intercalated Amorphous Polysaccharides for Controlled Iridescence and Enhanced Mechanics

Multimodal Wrinkle Micro‐Nanoarchitectonics by Patterned Surface Material Properties for Transformative Structural Coloration

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