Soft magnetic memory of silk cocoon membrane

Roy, Madhumita; Dubey, Amarish; Singh, Sushil Kumar; Bhargava, Kalpana; Sethy, Niroj Kumar; Philip, Deepu; Sarkar, Sabyasachi; Bajpai, Alok; Das, Mainak

doi:10.1038/srep29214

Cited by 12 publications

(7 citation statements)

References 16 publications

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“…Wild Tassar silk cocoon was used to prepare ND-RGO. Tasar cocoon is a protein composite, primarily made up of beta sheet fibroin protein threads, glued to each other by an adhesive protein, viz., sericin; in its native state, it exhibits soft magnetic memory and in the presence of moisture behaves like a thermo-photo-electrical material (Roy et al 2012;Tulachan et al 2014Tulachan et al , 2016Roy et al 2016). To use the silk cocoon as a raw material for deriving ND-RGO, either the dead pupa was removed or once the moth emerges out of the cocoon, the cocoon is collected and used for further processing.…”

Section: Preparation Of Nd-rgomentioning

confidence: 99%

Sequential entrapping of Li and S in a conductivity cage of N-doped reduced graphene oxide supercapacitor derived from silk cocoon: a hybrid Li–S-silk supercapacitor

Jangir

Pandey

R³

et al. 2018

Appl Nanosci

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Li and S compounds are currently exploited for their applications in battery industry. Here, we discovered that Li-S compounds exhibit supercapacitor like properties in a context-dependent manner viz., when Li and S atoms are entrapped in a conductivity cage of N-doped reduced graphene oxide (ND-RGO) supercapacitor derived from silk cocoon, it resulted in the formation of a superior hybrid Li-S-silk (ND-RGO-Li-S) supercapacitor. Interestingly, ND-RGO-Li-S proves to be a better supercapacitor than ND-RGO alone. Electrochemical properties of ND-RGO versus ND-RGO-Li-S indicated that the later has higher capacitance (~ 10.72%), lower resistance (~ 2.98%), and higher time constant or relaxation time (~ 7.52%). Thus, in one of the first attempts, caging Li and S in ND-RGO supercapacitor matrix offers a new role for Li-S, as an improved supercapacitor, unlike its current application as a battery.

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Section: Preparation Of Nd-rgomentioning

confidence: 99%

Sequential entrapping of Li and S in a conductivity cage of N-doped reduced graphene oxide supercapacitor derived from silk cocoon: a hybrid Li–S-silk supercapacitor

Jangir

Pandey

R³

et al. 2018

Appl Nanosci

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“…It is possible that the small quantities of iron innately present in SF imparted a baseline magneto‐responsive observed in this work. [ 50 ] Of the trace metals innately found in nascent B. mori silk cocoons, iron is the most abundant, although it is primarily associated with the sericin protein (removed during the SF extraction process) rather than the fibroin protein (from which the mSF, and subsequently, the Fe 3+ ‐mSF, were fabricated). However, alignment responses of “no iron added” mSF exhibited less uniformity than those of iron‐chelated Fe 3+ ‐mSF.…”

Section: Resultsmentioning

confidence: 99%

Iron‐Chelated Silk Microfibers as a Novel Magneto‐Responsive Architecture for In Situ Aligning Biomaterial Scaffolds

Wojnowski,

Martin,

Kanber

et al. 2023

Adv Funct Materials

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Magnetically functionalized biomaterials represent an exciting prospect in the development of stimuli‐responsive tissue engineering scaffolds. Magneto‐responsive properties are traditionally imparted to scaffold systems via integration of iron oxide‐based magnetic nanoparticles (MNPs), yet poor understanding of long‐term MNP toxicity presents a significant translational challenge. Given the demonstrated iron‐binding capacity of silk fibroin (SF), passive chelation of ferric iron ions is explored herein as an alternative, MNP‐free approach for magnetic functionalization of silk fibroin (SF)‐based biomaterials. SF microfibers treated with aqueous ferric chloride (FeCl3) exhibit significantly increased iron content relative to the nascent protein. Coupled with the absence of detectable chlorine traces and inorganic iron oxide species, the ferric oxidation state of the iron detected within the FeCl3‐treated microfibers suggests that iron is incorporated, without reduction, at innate oxygen‐containing ligands in SF. On exposure to an external magnetic field, these ferric iron‐chelated SF microfibers (Fe3+‐mSF) display paramagnetic magnetization behaviors that facilitate field‐parallel alignment. Both magnetization and directional uniformity increase with iron exposure during FeCl3 treatment, suggesting the observed magnetic response of Fe3+‐mSF is derived from the chelated iron. This work is the first to investigate the magneto‐responsive properties and biocompatibility of ferric iron‐chelated SF, highlighting a novel, MNP‐free mechanism for synthesizing magnetically functionalizedscaffolds.

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“…The harsh UV rays are absorbed on the cocoon surface by antioxidant UV protectant compounds present on the outer surface of the silk cocoon [6][7][8]12 . The silk cocoon senses gravity through its soft magnetic features, thus supporting the healthy development of the pupae 13 .…”

Section: Introductionmentioning

confidence: 99%

Water vapor fuelled brine-silk cocoon protein bio-battery for a self-lighting kettle and water-vapor panels

Jangir

Das

2022

Preprint

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Water vapor increases the electrical conductivity of silk cocoons, human hair, jute, and corn silk. This phenomenon is unclear. In the present study, XPS analysis of cocoons showed that water vapor reduces the surface presence of low-energy carbon species (C-C, C-H). In contrast, electron-dense, high-energy carbon species (C-N, C = C, C = O) remained unchanged, possibly enhancing surface charge hopping. While water vapor improves the conduction, the deficiency of charge carrier diminishes the effect. We increase the charge carrier by soaking the cocoon in an aqueous solution of common salt (NaCl) to amplify the current. Salt treatment followed by two-minute exposure to water vapor results in a sharp upward spike in the current (3.6 ± 1.07 mA, n = 12; mean ± SE) from the baseline (0.06 ± 0.02 mA, n = 12). After one hour, it maintains an average value of 0.39 ± 0.12, n = 12) ampere, indicating an upward shift in the baseline. Every time the cocoon charges with water vapor, the next charging cycle initiates after the cocoon dries up. Inspired by the cocoon ecology, we demonstrate an alternating 'water vapor- dry air' cycle for rapid charging and discharging of the cocoon battery. Finally, we designed a prototype of a self-lighting kettle and water-vapor panels for futuristic homes using a 'brine-silk cocoon protein bio-battery,' where moist waste heat generates electricity.

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Soft magnetic memory of silk cocoon membrane

Cited by 12 publications

References 16 publications

Sequential entrapping of Li and S in a conductivity cage of N-doped reduced graphene oxide supercapacitor derived from silk cocoon: a hybrid Li–S-silk supercapacitor

Sequential entrapping of Li and S in a conductivity cage of N-doped reduced graphene oxide supercapacitor derived from silk cocoon: a hybrid Li–S-silk supercapacitor

Iron‐Chelated Silk Microfibers as a Novel Magneto‐Responsive Architecture for In Situ Aligning Biomaterial Scaffolds

Water vapor fuelled brine-silk cocoon protein bio-battery for a self-lighting kettle and water-vapor panels

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