Tuning the Refractive Index and Optical Band Gap of Silk Fibroin Films by Electron Irradiation

Asha, S.; Sangappa, Y.; Sanjeev, Ganesh

doi:10.1155/2015/879296

Cited by 43 publications

(31 citation statements)

References 41 publications

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“…Silk protein is semi‐crystalline, where the small crystallites are distributed in the amorphous matrix. The crystallite content contributes to the stability of protein [24]. The percentage of crystallinity to be determined by the area of the crystalline peak to the total peaks in the XRD graph as shown in Eq.…”

Section: Resultsmentioning

confidence: 99%

Spectroscopic analysis of Muga silk nanoparticles synthesized by microwave method

Asapur

Banerjee

Sahare

et al. 2020

Biotech and App Biochem

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Muga silk nanoparticles (MSNP) were synthesized using a microwave‐assisted radiolysis method. The effect of microwave on the Muga protein secondary structures was analyzed. The evolution of the secondary structure from random coils to the β‐sheets was determined by using FTIR, circular dichroism and X‐ray diffraction techniques. The results showed that Muga silk fibroin protein contained the primary structure in silk‐I state. When the protein was irradiated with microwave, nanoparticle synthesis was possible having silk‐II state imparting crystallinity. The silk nanoparticles were characterized by a particle size analyzer and found to be of ~240 nm in size. The optical properties of these nanoparticles were studied by UV–vis. spectroscopy and photoluminescence. For studying thermal properties, differential scanning calorimetry was performed that revealed early glass transition, which could be attributed to the presence of water and proteins. It also revealed that nanoparticles are thermally stable. Such studies are important for understanding more about the MSNP and would be beneficial for their further wide applications.

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Section: Resultsmentioning

confidence: 99%

Spectroscopic analysis of Muga silk nanoparticles synthesized by microwave method

Asapur

Banerjee

Sahare

et al. 2020

Biotech and App Biochem

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“…Pyroelectric current of spider silk compared to thermal diffusivity (based on laser intensity modulated between 10 and 90 mW, and a sample reflectivity between 10%–30%). The presence and macroscopic alignment of crystalline sheets in the synthetic silk contribute to a greater pyroelectric response, which is also mirrored in the thermal diffusivity.…”

Section: Resultsmentioning

confidence: 99%

Investigation of Synthetic Spider Silk Crystallinity and Alignment via Electrothermal, Pyroelectric, Literature XRD, and Tensile Techniques

Munro

Putzeys

Copeland

et al. 2017

Macro Materials & Eng

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The processes used to create synthetic spider silk greatly affect the properties of the produced fibers. This paper investigates the effect of process variations during artificial spinning on the thermal and mechanical properties of the produced silk. Property values are also compared to the ones of the natural dragline silk of the N. clavipes spider, and to unprocessed (as-spun) synthetic silk. Structural characterization by scanning pyroelectric microscopy is employed to provide insight into the axial orientation of the crystalline regions of the fiber and is supported by XRD data. The results show that stretching and passage through liquid baths induce crystal formation and axial alignment in synthetic fibers, but with different structural organization than natural silks. Furthermore, an increase in thermal diffusivity and elastic modulus is observed with decreasing fiber diameter, trending towards properties of natural fiber. This effect seems to be related to silk fibers being subjected to a radial gradient during production.

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“…The silk fibroin was used as material for tissue engineering for skin, bone, blood vessel, ligament and nerve tissue regeneration, because it is non-immunogenic and non-toxic material. Some research articles show that silk fibroin is biodegradable, but the degradation rate of silk fibroin is not yet clear [163,[173][174][175][176][177][178][179][180][181][182]. The silk production is a natural ability of some arachnids, such as spiders, including some fossil species.…”

Section: Silk Proteins (Fibroin and Sericin) And Spider Silkmentioning

confidence: 99%

Biological synthesis of metallic nanoparticles: plants, animals and microbial aspects

Das

Pachapur

Lonappan

et al. 2017

Nanotechnol. Environ. Eng.

384

138

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The green synthesis (GS) of different metallic nanoparticles (MNPs) has re-evaluated plants, animals and microorganisms for their natural potential to reduce metallic ions into neutral atoms at no expense of toxic and hazardous chemicals. Contrary to chemically synthesized MNPs, GS offers advantages of enhanced biocompatibility and thus has better scope for biomedical applications. Plant, animals and microorganisms belonging to lower and higher taxonomic groups have been experimented for GS of MNPs, such as gold (Au), silver (Ag), copper oxide (CuO), zinc oxide (ZnO), iron (Fe 2 O 3 ), palladium (Pd), platinum (Pt), nickel oxide (NiO) and magnesium oxide (MgO). Among the different plant groups used for GS, angiosperms and algae have been explored the most with great success. GS with animal-derived biomaterials, such as chitin, silk (sericin, fibroin and spider silk) or cell extract of invertebrates have also been reported. Gram positive and gram negative bacteria, different fungal species and virus particles have also shown their abilities in the reduction of metal ions. However, not a thumb rule, most of the reducing agents sourced from living world also act as capping agents and render MNPs less toxic or more biocompatible. The most unexplored area so far in GS is the mechanism studies for different natural reducing agents expect for few of them, such as tea and neem plants. This review encompasses the recent advances in the GS of MNPs using plants, animals and microorganisms and analyzes the key points and further discusses the pros and cons of GS in respect of chemical synthesis.

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Tuning the Refractive Index and Optical Band Gap of Silk Fibroin Films by Electron Irradiation

Cited by 43 publications

References 41 publications

Spectroscopic analysis of Muga silk nanoparticles synthesized by microwave method

Spectroscopic analysis of Muga silk nanoparticles synthesized by microwave method

Investigation of Synthetic Spider Silk Crystallinity and Alignment via Electrothermal, Pyroelectric, Literature XRD, and Tensile Techniques

Biological synthesis of metallic nanoparticles: plants, animals and microbial aspects

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