Biopolymer nanofibrils: Structure, modeling, preparation, and applications

Ling, Shengjie; Chen, Wenshuai; Fan, Yimin; Zheng, Ke; Jin, Kai; Yu, Haipeng; Buehler, Markus J.; Kaplan, David L.

doi:10.1016/j.progpolymsci.2018.06.004

Cited by 330 publications

(268 citation statements)

References 592 publications

(873 reference statements)

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“…Wood aerogels directly obtained from natural wood possessed lower thermal conductivity and density than natural wood and wood waste [46]. It is worth mentioning that, although the thermal insulation performance of wood aerogel was lower than traditional organic materials and cellulose-based aerogel [47], the developed wood aerogel in this study showed much better biocompatibility, biodegradability, and mechanical compressibility, as well as simpler process technology [13,48].…”

Section: Thermal Insulationmentioning

confidence: 77%

Lightweight, Anisotropic, Compressible, and Thermally-Insulating Wood Aerogels with Aligned Cellulose Fibers

Sun

Lin

et al. 2020

Polymers

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The growing demand for lightweight, renewable, and excellent thermal insulation materials has fueled a search for high performance biomass materials with good mechanical compressibility and ultralow thermal conductivity. We propose a fabrication method for making a lightweight, anisotropic, and compressible wood aerogel with aligned cellulose fibers by a simple chemical treatment. The wood aerogel was mainly composed of highly aligned cellulose fibers with a relative crystallinity of 77.1%. The aerogel exhibits a low density of 32.18 mg/cm3 and a high specific surface area of 31.68 m2/g due to the removal of lignin and hemicellulose from the wood. Moreover, the multilayer structure of the aerogel was formed under the restriction of wood rays. Combined with a nanoscale pore, the aerogel presents good compressibility and an ultralow thermal conductivity of 0.033 W/mK. These results show that the wood aerogel is a high quality biomass material with a potential function of thermal insulation through optimizing structures.

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Section: Thermal Insulationmentioning

confidence: 77%

Lightweight, Anisotropic, Compressible, and Thermally-Insulating Wood Aerogels with Aligned Cellulose Fibers

Sun

Lin

et al. 2020

Polymers

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“…Among nanocelluloses, cellulose nanocrystals (CNC) are stiff nanorods obtained by harsh acid hydrolysis. Thanks to their colloidal properties, high specific surfaces and surface chemistry, CNCs have been the subject of intense research to design innovative biobased materials among which composites, emulsions, foams and hydrogels [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Influence of Xyloglucan Molar Mass on Rheological Properties of Cellulose Nanocrystal/Xyloglucan Hydrogels

Talantikite¹,

Gourlay²,

Gall³

et al. 2019

Journal of Renewable Materials

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Plant components are an inexhaustible source for the construction of bio-based materials. Here we report, for the first time, the elaboration of biobased cellulose nanocrystals (CNC)/xyloglucan (XG) hydrogels. XG is a hemicellulose displaying a great affinity for cellulose surface and can be thus irreversibly adsorbed on CNC. Properties of the hydrogels were investigated by varying the molar mass of XG either by enzymatic treatment with Endoglucanase (EG2) or physical fractionation by ultrasound (US). Fractions were characterised by high-performance size exclusion chromatography (HPSEC) and their monosacchari decompositions were determined. Three fractions with high, average and small molar mass, (800, 300 and 100 10 3 g/mol respectively), were selected in order to tune the properties of the hydrogel. Sol-gel transition conditions were determined for each fraction by achieving phase diagram using the inverted tube method. Mechanical properties, assessed by rheology, are improved by increasing XG molar mass since elastic modulus is higher for hydrogels formed with higher molar mass fractions as well as the strain at break. Gel formation is likely due to the adsorption of XG fractions on CNC which increases the effective hydrodynamic volume of CNC leading to steric stabilization and interactions between loops and tails of XG adsorbed.

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“…However, this conflict does not exist in silk fibers, especially the spider dragline silk and wild silkworm cocoon silks, which feature a unique combination of strength and mechanical toughness. These animal silk fibers resolve the conflict through hierarchical and heterogeneous nanoconfinement, which is defined as optimizing the strength, stiffness, and toughness of materials through confining their building blocks at critical length scales [30,31]. In animal silks, nanoconfinement exists in multiple length scales ( Fig.…”

Section: Discussionmentioning

confidence: 99%

Nanofibril Organization in Silk Fiber as Inspiration for Ductile and Damage-Tolerant Fiber Design

Lin

Zhang

et al. 2019

Adv. Fiber Mater.

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Ductile and damage-tolerant fibers (DDTFs) are desired in aerospace engineering, mechanical engineering, and biomedical engineering because of their ability to prevent the catastrophic sudden structural/mechanical failure. However, in practice, design and fabrication of DDTFs remain a major challenge due to finite fiber size and limited processing techniques. In this regard, animal silks can provide inspirations. They are hierarchically structured protein fibers with an elegant trade-off of mechanical strength, extensibility and damage tolerance, making them one of the toughest materials known. In this article, we confirmed that nanofibril organization could improve the ductility and damage-tolerance of silk fibers through restricted fibril shearing, controlled slippage and cleavage. Inspired by these strategies, we further established a rational strategy to produce polyamide DDTFs by combining electrospinning and yarn-spinning techniques. The resultant polymeric DDTFs show a silklike fracture resistance behavior, indicating potential applications in smart textile, biomedicine, and mechanical engineering.

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Biopolymer nanofibrils: Structure, modeling, preparation, and applications

Cited by 330 publications

References 592 publications

Lightweight, Anisotropic, Compressible, and Thermally-Insulating Wood Aerogels with Aligned Cellulose Fibers

Lightweight, Anisotropic, Compressible, and Thermally-Insulating Wood Aerogels with Aligned Cellulose Fibers

Influence of Xyloglucan Molar Mass on Rheological Properties of Cellulose Nanocrystal/Xyloglucan Hydrogels

Nanofibril Organization in Silk Fiber as Inspiration for Ductile and Damage-Tolerant Fiber Design

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