Tensile stress-strain and recovery behavior of Indian silk fibers and their structural dependence

Rajkhowa, Rangam; Gupta, V. B.; Kothari, V. K.

doi:10.1002/1097-4628(20000912)77:11<2418::aid-app10>3.0.co;2-q

Cited by 73 publications

(34 citation statements)

References 12 publications

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“…Some species of silkworm can produce silk fibers exhibiting a shape and strain hardening similar to that of spider. [124,125] Because of their strength and toughness, silk fibers are good candidates for the development of scaffolds for load bearing tissue engineering. The possibility of adapting different types of silk to the mechanical properties required for a biomaterial implant is an important advantage associated with the use of silk.…”

Section: Sf Potential Featuresmentioning

confidence: 99%

Bombyx moriSilk Fibers: An Outstanding Family of Materials

Pereira

Silva

Bermúdez

2014

Macromol. Mater. Eng.

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Designing novel multifunctional materials from natural resources is a challenging goal that has increasingly attracted researchers. Recently, the great potential of silk fibers has been recognized. The target readers for this review are researchers from different backgrounds (i.e., non‐specialists in silk research) with special interests on the physical–chemical characterization of silk fibers, since their knowledge is crucial for the improvement of existent silk‐based biomaterials and the basis for the development of new products. Examples of usual applications of Bombyx mori silk fibers are given and some of the most recent and exciting progress in new technological fields, is presented.

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Section: Sf Potential Featuresmentioning

confidence: 99%

Bombyx moriSilk Fibers: An Outstanding Family of Materials

Pereira

Silva

Bermúdez

2014

Macromol. Mater. Eng.

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“…It is clear from figure 3 that for Muga, the individual stress-strain plots nearly overlap each other, while the endpoints are tightly distributed along the common plot indicating only a small variation of size and structure between specimens. The Muga test specimens were harvested from a 5 m long reeled silk strand which is expected to be uniform in thickness and microstructure [19]. An Eri strand could not be reeled continuously and the specimens were collected from a thin layer of the cocoon shell, resulting in a wider dispersion in stress-strain profiles (figure 4) compared to Muga fibres (figure 3), which is consistent with the higher coefficient of variation in the cross-sectional area of Eri silk.…”

Section: Cross Section and Fracture Analysismentioning

confidence: 99%

Intrinsic tensile properties of cocoon silk fibres can be estimated by removing flaws through repeated tensile tests

Rajkhowa

Kaur

Wang

et al. 2015

J. R. Soc. Interface.

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Silk fibres from silkworm cocoons have lower strength than spider silk and have received less attention as a source of high-performance fibres. In this work, we have used an innovative procedure to eliminate the flaws gradually of a single fibre specimen by retesting the unbroken portion of the fibre, after each fracture test. This was done multiple times so that the final test may provide the intrinsic fibre strength. During each retest, the fibre specimen began to yield once the failure load of the preceding test was exceeded. For each fibre specimen, a composite curve was constructed from multiple tests. , which is used as a benchmark for developing high-performance fibres. This retesting approach is likely to provide useful insights into discrete flaw distributions and intrinsic mechanical properties of other fatigue-resistant materials.

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“…Such variations result in differences in mechan ical properties, bioactivity, and degradation behavior between mulberry and nonmulberry silks. [47] To produce conductive, biocompatible, and mechani cally robust materials for use as electrically address able biomaterials, we have developed a novel yet simple strategy to selectively coat PPY and PANI over silk fibroin constructs. Natural A. mylitta degummed SFs were coated with PPY and PANI through in situ oxidative poly merization.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Characterization of Conductive Conjugated Polymer‐Coated Antheraea mylitta Silk Fibroin Fibers for Biomedical Applications

Kong

Gautrot

et al. 2017

Macromolecular Bioscience

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Conductive polymers are interesting materials for a number of biological and medical applications requiring electrical stimulation of cells or tissues. Highly conductive polymers (polypyrrole and polyaniline)/Antheraea mylitta silk fibroin coated fibers are fabricated successfully by in situ polymerization without any modification of the native silk fibroin. Coated fibers characterized by scanning electron microscopy confirm the silk fiber surface is covered by conductive polymers. Thermogravimetric analysis reveals preserved thermal stability of silk fiber after coating process. X-ray diffraction of degummed fiber diffraction peaks at around 2θ = 20.4 and 16.5 confirms the preservation of the β-sheet structure typical of degummed silk II fibers. This phenomenon implies that both polypyrrole and polyaniline chains form interactions with peptide linkages in degummed fiber macromolecules, without significantly disrupting protein assembly. Fourier transform infrared spectroscopy of coated fibers indicates hydrogen bonding and electrostatic interactions exist between silk fibroin macromolecules and conductive polymers. Resulting fibers display good conductive properties compared to corresponding conjugated polymers. In vitro analysis (live/dead assay) of the behavior of human immortalized keratinocytes (HaCaTs) on coated fibers demonstrates improved cell-adhesive properties and viability after polymers coating. Hence, polypyrrole- and polyaniline-coated A. mylitta silk fibers are suitable for application in cell culture and for tissue engineering, where electrical conduction properties are required.

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Tensile stress-strain and recovery behavior of Indian silk fibers and their structural dependence

Cited by 73 publications

References 12 publications

Bombyx moriSilk Fibers: An Outstanding Family of Materials

Bombyx moriSilk Fibers: An Outstanding Family of Materials

Intrinsic tensile properties of cocoon silk fibres can be estimated by removing flaws through repeated tensile tests

Fabrication and Characterization of Conductive Conjugated Polymer‐Coated Antheraea mylitta Silk Fibroin Fibers for Biomedical Applications

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