Optically probing torsional superelasticity in spider silks

Kumar, Bhupesh; Thakur, Ashish; Panda, Biswajit; Singh, Kanwarpal

doi:10.1063/1.4831766

Cited by 16 publications

(10 citation statements)

References 21 publications

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“…[126] Spider silk exhibit a high damping capacity to eliminate rotation when the hanging spider was torsionally triggered. [127] This damping effect of the spider silk can be attributed to the coordination of the crystalline (alanine block) and the amorphous blocks (glycine block), where the crystalline block provides rigidity and the amorphous block mainly dissipates rotating energy. [5] Inspired by such torsional mechanical damping behavior, the Kim group prepared a torsional fiber actuator exhibiting a high torsional damping capacity by employing a twisted CNT yarn that was imbued with paraffin wax and polystyrene-poly(ethylenebutylene)-polystyrene (SEBS) copolymer.…”

Section: Artificial Fibers Exhibiting Torsional Energy Dissipation An...mentioning

confidence: 99%

Spider Silk‐Inspired Artificial Fibers

Huang

et al. 2021

Advanced Science

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Spider silk is a natural polymeric fiber with high tensile strength, toughness, and has distinct thermal, optical, and biocompatible properties. The mechanical properties of spider silk are ascribed to its hierarchical structure, including primary and secondary structures of the spidroins (spider silk proteins), the nanofibril, the "core-shell", and the "nano-fishnet" structures. In addition, spider silk also exhibits remarkable properties regarding humidity/water response, water collection, light transmission, thermal conductance, and shape-memory effect. This motivates researchers to prepare artificial functional fibers mimicking spider silk. In this review, the authors summarize the study of the structure and properties of natural spider silk, and the biomimetic preparation of artificial fibers from different types of molecules and polymers by taking some examples of artificial fibers exhibiting these interesting properties. In conclusion, biomimetic studies have yielded several noteworthy findings in artificial fibers with different functions, and this review aims to provide indications for biomimetic studies of functional fibers that approach and exceed the properties of natural spider silk.

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Section: Artificial Fibers Exhibiting Torsional Energy Dissipation An...mentioning

confidence: 99%

Spider Silk‐Inspired Artificial Fibers

Huang

et al. 2021

Advanced Science

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“…20 Surprisingly, molecular deformation of silk under torsion has remained unknown. Furthermore, it is also fundamentally important to characterize fatigue response of spider draglines, for example, in extreme cyclic torsion up to breaking limit.…”

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“…20 The spider was made to jump from a small plastic rod following which it suspended itself from the dragline silk. The typical diameter (D) of the silk filaments was around 2-4 lm as measured from scanning electron microscope (SEM) images (Fig.…”

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confidence: 99%

“…Previous measurements on macroscale torsion response reported its shear modulus [18], small angle self-recovery of twist [19] and a torsional superelasticity, i.e., its ability to reversibly withstand great torsional strain without rupture [20]. Surprisingly, molecular deformation of silk under torsion has remained unknown.…”

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confidence: 99%

“…The dragline silks were obtained from the female spider (Areneous Neoscona) harnessed in laboratory at 25 • C and 50 % humidity [20]. The spider was made to jump from a small plastic rod following which it suspended itself from the dragline silk.…”

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Fatigueless response of spider draglines in cyclic torsion facilitated by reversible molecular deformation

Kumar

Singh

2014

Applied Physics Letters

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We demonstrate that spider draglines exhibit a fatigueless response in extreme cyclic torsion up to its breaking limit. The well defined Raman bands at 1095 and 1245 cm -1 shifted linearly towards lower wavenumbers versus increasing twist in both clockwise and counter-clockwise directions. Under thousands of continuous loading cycles of twist strain approaching its breaking limit, all the Raman bands were preserved and the characteristic Raman peak shifts were found to be reversible. Besides, nanoscale surface profile of the worked silk appeared as good as the pristine silk. This unique fatigueless twist response of draglines, facilitated by reversible deformation of protein molecules, could find applications in durable miniatured devices. V C 2014 AIP Publishing LLC.

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