A novel technique in the preparation of environmentally friendly cellulose nanofiber/silk fibroin fiber composite films with improved thermal and mechanical properties

Narita, Chieko; Okahisa, Yoko; Yamada, Kazutoyo

doi:10.1016/j.jclepro.2019.06.215

Cited by 45 publications

(34 citation statements)

References 35 publications

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“…Particularly, SF protein is well-known for its ability to form a high-strength proteinaceous material and has a favorable affinity to nanocellulose. 11 , 63 , 64 …”

Section: Resultsmentioning

confidence: 99%

“…For instance, several reports indicate gains in mechanical strength upon addition of silk fibroin to cellulose, with the latter in both the dissolved and fibrillated forms, although the strength of the cellulose component is generally weakened in such composites. 63 , 83 − 85 There are a few examples of an enhancement of the mechanical properties of both components in cellulose–silk composite materials. 11 , 81 , 86 Others studies indicate a negative influence of blending on material properties.…”

Section: Resultsmentioning

confidence: 99%

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Infiltration of Proteins in Cholesteric Cellulose Structures

et al. 2021

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Cellulose nanocrystals (CNCs) can spontaneously self-assemble into chiral nematic (cn) structures, similar to natural cholesteric organizations. The latter display highly dissipative fracture propagation mechanisms given their “brick” (particles) and “mortar” (soft matrix) architecture. Unfortunately, CNCs in liquid media have strong supramolecular interactions with most macromolecules, leading to aggregated suspensions. Herein, we describe a method to prepare nanocomposite materials from chiral nematic CNCs (cn-CNCs) with strongly interacting secondary components. Films of cn-CNCs were infiltrated at various loadings with strongly interacting silk proteins and bovine serum albumin. For comparison and to determine the molecular weight range of macromolecules that can infiltrate cn-CNC films, they were also infiltrated with a range of poly(ethylene glycol) polymers that do not interact strongly with CNCs. The extent and impact of infiltration were evaluated by studying the optical reflection properties of the resulting hybrid materials (UV–vis spectroscopy), while fracture dissipation mechanisms were observed via electron microscopy. We propose that infiltration of cn-CNCs enables the introduction of virtually any secondary phase for nanocomposite formation that is otherwise not possible using simple mixing or other conventional approaches.

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“…Particularly, SF protein is well-known for its ability to form a high-strength proteinaceous material and has a favorable affinity to nanocellulose. 11 , 63 , 64 …”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Infiltration of Proteins in Cholesteric Cellulose Structures

et al. 2021

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“…The tensile strength of this crosslinked hydrogel lm is 52.7 AE 2.5 MPa, which is increased to 174.1 AE 3.7 MPa aer combining with SF. This indicates that SF has packed between the hydrogel bers and its molecular chains, thereby strengthening and tightening the structure 51. In general, broin has been reported to have very great mechanical strength 52.…”

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confidence: 94%

Investigation of the biological activity, mechanical properties and wound healing application of a novel scaffold based on lignin–agarose hydrogel and silk fibroin embedded zinc chromite nanoparticles

et al. 2021

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“…Recently, a study has succeeded in producing an aqueous fibroin solution directly from silkworm cocoons by grinding without utilizing any organic solvent. 18 , 19 Hence, it is a physical nanofibrillation method, not a chemical one. The fibroin film, which was prepared using the ground silk fibroin (GF) solution obtained by grinding, had superior mechanical and thermal properties compared with those prepared from RF solutions.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Ground Silk Fibroin through Comparison of Nanofibroin and Higher Order Structures

et al. 2020

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Silk fibroin, a biodegradable component of silk, is increasingly used for various applications and studied intensively. Recently, a technique for preparing nanofibers without using chemicals has been gaining attention from the environmental impact and safety perspectives. This study focuses on the structure observation of ground silk fibroin (GF) prepared using a grinding method, which is a physical nanofibrillation method. The fabricated nanofiber samples were examined in detail using the X-ray diffraction (XRD), differential scanning calorimetry (DSC), micro Raman spectroscopy, and atomic force microscopy (AFM) techniques. The nanofibrillated structures were observed in both GF and regenerated silk fibroin (RF) samples prepared using the conventional method. As results, AFM images showed that the nanofibril diameter of GF was about 1.64 nm and that of RF was about 0.32 nm. Methanol treatment induced a structural transition from a random coil to a β-sheet for the RF film, but it had no effect on the GF film. Thus, it is suggested that the grinding method provides not only ultrafine silk fibroin nanofibers without using toxic reagents but also resistance to reagents such as methanol.

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A novel technique in the preparation of environmentally friendly cellulose nanofiber/silk fibroin fiber composite films with improved thermal and mechanical properties

Cited by 45 publications

References 35 publications

Infiltration of Proteins in Cholesteric Cellulose Structures

Infiltration of Proteins in Cholesteric Cellulose Structures

Investigation of the biological activity, mechanical properties and wound healing application of a novel scaffold based on lignin–agarose hydrogel and silk fibroin embedded zinc chromite nanoparticles

Characterization of Ground Silk Fibroin through Comparison of Nanofibroin and Higher Order Structures

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