Water-stable natural silk nanofibril composite films for electrical devices

Cai, Junyi; Wang, Qiusheng; Li, Xiufang; Guan, Yupin; He, L.; Yan, Shuqin; You, Renchuan; Zhang, Qiang

doi:10.1016/j.mtcomm.2019.100776

Cited by 13 publications

(15 citation statements)

References 26 publications

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“…The surface and interior of the TSn membrane were more compact than those of the BSn membrane, which showed a rougher surface. Although Ca(NO 3 ) 2 /CH 3 CH 2 OH/H 2 O solution treatment had been used to assist nanofiber exfoliation, 20 it was not a necessary step to obtain silk nanofibers. In this study, the degummed silk was directly used to fabricate nanofiber membranes by physical shearing, avoiding the time-consuming process and potential solvent residual.…”

Section: Resultsmentioning

confidence: 99%

“…Note that the diameter of BSn obtained in this study was smaller than that derived from Ca(NO 3 ) 2 /CH 3 CH 2 OH/H 2 O-treated silk reported previously. 20 After high-speed shear treatment, the original structure of silk was disrupted to form silk nanofibers through destroying the interaction forces between nanofibrils. 21 , 22 The membrane formed by the nanofibers had a large specific surface area, which made the cells have a larger contact area when growing on the membrane surface.…”

Section: Resultsmentioning

confidence: 99%

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Biological Efficacy Comparison of Natural Tussah Silk and Mulberry Silk Nanofiber Membranes for Guided Bone Regeneration

Chen

Gao

et al. 2022

ACS Omega

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Biopolymer nanofiber membranes are attracting interest as promising biomaterial scaffolds with a remarkable range of structural and functional performances for guided bone regeneration (GBR). In this study, tussah silk nanofiber (TSn) and Bombyx mori silk nanofiber (BSn) membranes were prepared by physical shearing. The diameters of the TSn and BSn membranes were 146.09 ± 63.56 and 120.99 ± 91.32 nm, respectively. TSn showed a Young’s modulus of 3.61 ± 0.64 GPa and a tensile strength of 74.27 ± 5.19 MPa, which were superior to those of BSn, with a Young’s modulus of 0.16 ± 0.03 GPa and a tensile strength of 4.86 ± 0.61 MPa. The potential of TSn and BSn membranes to guide bone regeneration was explored. In vitro, the TSn membrane exhibited significantly higher cell proliferation for MC3T3-E1 cells than the BSn membrane. In a cranial bone defect in a rat model, the TSn and BSn membranes displayed superior bone regeneration compared to the control because the membrane prevented the ingrowth of soft tissue to the defective area. Compared to the BSn membrane, the TSn membrane improved damaged bone regeneration, presumably due to its superior mechanical properties, high osteoconductivity, and increased cell proliferation. The TSn membrane has a bionic structure, excellent mechanical properties, and greater biocompatibility, making it an ideal candidate for GBR.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Biological Efficacy Comparison of Natural Tussah Silk and Mulberry Silk Nanofiber Membranes for Guided Bone Regeneration

Chen

Gao

et al. 2022

ACS Omega

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“…Ethanol molecules could enhance the movement of the hydrophobic side chains of silk fibroin, and calcium ions could bind to the carbonyl oxygen of silk fibroin, leading to the weakened hydrogen bonding and hydrophobic interaction between fibrils. 25,29,32 After the ternary solvent and mechanical treatment, the diameters of the silk fibers decreased significantly, 28 suggesting that the hot solvent partially dissolved the silk fibroin of the fiber surface. After only mechanical disintegration for 1 min, numerous fibrils were exposed to the surface of silks, indicating that silk fibrils could be easily exfoliated (Figure 1B and Figure S1A, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

“…Silkworm silks have a hierarchical structure based on the conformational structure of the antiparallel β-sheet chain and exhibit a multiscale assembly of nanofibrils. , To isolate nanofibrils from native silks by mechanical processes, harsh chemical agents are inevitably used. ,, Thus, the large-scale production and functional applications of natural silk nanofibrils are severely hindered. Recently, we developed a simple, green, and scalable method for a solvent-free extraction of SNFs by using a mild chemical pretreatment. , As illustrated in Figure A, to weaken the forces between fibrils, the degummed silk fibers were pretreated with a ternary solution at 45 °C for 6 h to swell and generate microgaps between the nanofibrils. Ethanol molecules could enhance the movement of the hydrophobic side chains of silk fibroin, and calcium ions could bind to the carbonyl oxygen of silk fibroin, leading to the weakened hydrogen bonding and hydrophobic interaction between fibrils. ,, …”

Section: Resultsmentioning

confidence: 99%

Natural Silk Nanofibril Aerogels with Distinctive Filtration Capacity and Heat-Retention Performance

Yan

et al. 2021

ACS Nano

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Nanofibrous aerogels have been extensively developed as multifunctional substrates in a wide range of fields. Natural silk nanofibrils (SNFs) are an appealing biopolymer due to their natural abundance, mechanical toughness, biodegradability, and excellent biocompatibility. However, fabricating 3D SNF materials with mechanical flexibility remains a challenge. Herein, SNF-based aerogels with controlled structures and well mechanical resilience were prepared. SNFs were extracted from silkworm silks by mechanical disintegration based on an all-aqueous system. The nanofibrils network and hierarchical cellular structure of the aerogels were tuned by the assembly of SNFs and foreign poly(vinyl alcohol) (PVA). The SNF aerogels exhibited an ultralow density (as low as 2.0 mg·cm–3) and well mechanical properties with a structure allowing for large deformations. These SNF aerogels demonstrated a reversible compression and stress retention after 100 cycles of compression. Furthermore, the resulting aerogels were used for air filtration and showed efficient filtration performance with a high dust-holding capacity and low resistance. Moreover, an extremely low thermal conductivity of 0.028 W·(m·K)−1 was achieved by the aerogel, showing its potential for use in heat-retention applications. This study provides a useful strategy for exploring the use of natural silks in 3D aerogels and offers options for developing filtration materials and ultralight heat-retention materials.

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“…Among them, silk fibroin nanofibers have been increasing attention because of its simulation of extracellular matrix (ECM) ( Babitha et al, 2017 ; Chouhan et al, 2017 ; Chen et al, 2018 ). Currently, some processes, such as electrospinning, self-assembly, chemical dissolution, and physical fiber separation, have been developed to prepare silk fibroin nanofibers ( Yin et al, 2017 ; Yang et al, 2018a ; Humenik et al, 2018 ; Niu et al, 2018 ; Tan et al, 2018 ; Zheng et al, 2018 ; Lv et al, 2019 ; Cai et al, 2020 ). Sukigara et al ( Sukigara et al, 2003 ) prepared silk fibroin nanofibers with an average diameter of less than 100 nm using electrospinning.…”

Section: Introductionmentioning

confidence: 99%

Robust Nanofiber Mats Exfoliated From Tussah Silk for Potential Biomedical Applications

Chen

Qin

et al. 2021

Front. Bioeng. Biotechnol.

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Nanofibers as elements for bioscaffolds are pushing the development of tissue engineering. In this study, tussah silk was mechanically disintegrated into nanofibers dispersed in aqueous solution which was cast to generate tussah silk fibroin (TSF) nanofiber mats. The effect of treatment time on the morphology, structure, and mechanical properties of nanofiber mats was examined. SEM indicated decreasing diameter of the nanofiber with shearing time, and the diameter of the nanofiber was 139.7 nm after 30 min treatment. These nanofiber mats exhibited excellent mechanical properties; the breaking strength increased from 26.31 to 72.68 MPa with the decrease of fiber diameter from 196.5 to 139.7 nm. The particulate debris was observed on protease XIV degraded nanofiber mats, and the weight loss was greater than 10% after 30 days in vitro degradation. The cell compatibility experiment confirmed adhesion and spreading of NIH-3T3 cells and enhanced cell proliferation on TSF nanofiber mats compared to that on Bombyx mori silk nanofiber mats. In conclusion, results indicate that TSF nanofiber mats prepared in this study are mechanically robust, slow biodegradable, and biocompatible materials, and have promising application in regenerative medicine.

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Water-stable natural silk nanofibril composite films for electrical devices

Cited by 13 publications

References 26 publications

Biological Efficacy Comparison of Natural Tussah Silk and Mulberry Silk Nanofiber Membranes for Guided Bone Regeneration

Biological Efficacy Comparison of Natural Tussah Silk and Mulberry Silk Nanofiber Membranes for Guided Bone Regeneration

Natural Silk Nanofibril Aerogels with Distinctive Filtration Capacity and Heat-Retention Performance

Robust Nanofiber Mats Exfoliated From Tussah Silk for Potential Biomedical Applications

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