Silk fibroin a bio-template for synthesis of different shaped gold nanoparticles: Characterization and ammonia detection application

Ranjana, R.; Parushuram, N.; Harisha, K. S.; Asha, S.; Sangappa, Y.

doi:10.1016/j.matpr.2019.11.259

Cited by 15 publications

(5 citation statements)

References 21 publications

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“…Then, the cocoon pieces were chemically degummed by boiling two times with 0.02 M Na 2 CO 3 solution at 95 °C for exactly 30 min. Subsequently, the sericin-free SF fiber was washed and cooled by rinsing with double distilled water and then dried. − The degummed SF fiber was dissolved in 9.3 M aqueous LiBr solution at 60 °C for ∼4 h. The obtained SF solution was then cooled and filled in a dialysis cassette with MWCO 3500 Da (Slide-A-Lyzer: Thermo Fisher Scientific), followed by dialysis against de-ionized water for 3 days at room temperature to eliminate the residual salts. The dialyzed clear SF solution was centrifuged for 20 min at 9000 rpm to eliminate the silk accumulation, if any had occurred during the process.…”

Section: Methodsmentioning

confidence: 99%

Conductive In Situ Reduced Graphene Oxide–Silk Fibroin Bionanocomposites

et al. 2021

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This research paper describes the fabrication of bionanocomposites (BNCs) based on silk fibroin (SF) and reduced graphene oxide (rGO). The recorded UV–visible (UV–vis) spectra of the sample confirm the reduction of GO to rGO in SF by showing a plasmon resonance band within the wavelength range of 261–268 nm. The X-ray diffraction (XRD) peak at 11.6° corresponding to the GO intensity decreases with increasing reaction time, resulting in rGO in the SF host matrix. The morphological behavior of the SF–rGO BNCs is scrutinized using scanning electron microscopy (SEM), and the images clearly indicate the existence of rGO within the matrix. The increasing amount of GO in the SF shows broken graphene sheets, which can increase the surface roughness and establish a strong physical contact between the SF and rGO nanosheets. The high-resolution transmission electron microscope (HR-TEM) image of the bionanocomposite showed that the formed rGO encompassments of fewer layers are stacked, each with fewer wrinkles and folding. The Raman spectroscopy confirmed the formation of rGO by showing the increased intensity ratio of D to G band (I D/I G) in the bionanocomposite samples. The rGO effect on the electrical conductivity is measured, and the results show that DC conductivity increases from 1.28 × 10–9 to 82.4 × 10–9 S/cm with an increase in the GO content in the SF biopolymer. The investigations demonstrate loss of the insulation property and improved conducting behavior of the SF biopolymer.

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Section: Methodsmentioning

confidence: 99%

Conductive In Situ Reduced Graphene Oxide–Silk Fibroin Bionanocomposites

et al. 2021

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“…Last, after high temperature calcination, bio-template is removed partly or totally, and NMs with benign biological structure characteristics are remained. [108][109][110][111][112] Generally speaking, plants, microorganisms, virus and biomolecules are all excellent bio-templates. For example, Yang et al assembled TiO 2 microtubes with yam-like via natural fiber template, and the nano-TiO 2 exhibited a higher photocatalytic activity than commercial P25.…”

Section: Bio-template Routementioning

confidence: 99%

Bio‐mediated synthesis – A sustainable strategy for nanomaterials preparation: A comprehensive bibliometric review

et al. 2021

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Nanomaterials have been widely used in multi-aspect because of their particular physicochemical properties. However, traditional physical and chemical synthetic methods of nanomaterials are costly, they are easy to produce toxic by-products which are harmful to environment and human health. In recent years, the synthesis of nanomaterials via biological mediated method has shown great potential with the advantage of environmentally friendly, cost-effective and high-efficiency. Plants, microorganisms, and biological extracts are all excellent candidates for biosynthesis. Furthermore, these kinds of bio-genic materials have been applied in many fields such as environment remediation, catalytic reaction, anti-microbsis and anti-tumor. Thus, in order to grasp the research progress and development trend of nanomaterials synthesized by bio-mediated methods, a comprehensive overview is presented based on Web of Science database and bibliometric analysis. The results proved that the number of publications increased year by year from 2010 to 2020, India and China were the main two contributors. Some research institutions and researchers have formed their stable cooperative groups. Keywords analysis showed that the co-occurrence network could be divided into four clusters, "green synthesis," "AgNPs," "AuNPs," "nanoparticles," and "leaf extract" were the most popular words. Moreover, publishing journals, highly cited articles and major disciplines were also studied. The review will provide valuable references for future research.

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“…Silk sensors have been developed to detect ammonia (Ranjana et al, 2020 ) and immunoglobulin G (Sohail Haroone et al, 2018 ). For example, the detection of ammonia was achieved with in situ -synthetized gold NPs in a silk dispersion with UV-B light as reducing agent (Ranjana et al, 2020 ). Interestingly, the UV absorption of gold NPs decreased as the ammonia concentration increased.…”

Section: Silk-based Bionanocompositesmentioning

confidence: 99%

Silk Polymers and Nanoparticles: A Powerful Combination for the Design of Versatile Biomaterials

et al. 2020

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Silk fibroin (SF) is a natural protein largely used in the textile industry but also in biomedicine, catalysis, and other materials applications. SF is biocompatible, biodegradable, and possesses high tensile strength. Moreover, it is a versatile compound that can be formed into different materials at the macro, micro- and nano-scales, such as nanofibers, nanoparticles, hydrogels, microspheres, and other formats. Silk can be further integrated into emerging and promising additive manufacturing techniques like bioprinting, stereolithography or digital light processing 3D printing. As such, the development of methodologies for the functionalization of silk materials provide added value. Inorganic nanoparticles (INPs) have interesting and unexpected properties differing from bulk materials. These properties include better catalysis efficiency (better surface/volume ratio and consequently decreased quantify of catalyst), antibacterial activity, fluorescence properties, and UV-radiation protection or superparamagnetic behavior depending on the metal used. Given the promising results and performance of INPs, their use in many different procedures has been growing. Therefore, combining the useful properties of silk fibroin materials with those from INPs is increasingly relevant in many applications. Two main methodologies have been used in the literature to form silk-based bionanocomposites: in situ synthesis of INPs in silk materials, or the addition of preformed INPs to silk materials. This work presents an overview of current silk nanocomposites developed by these two main methodologies. An evaluation of overall INP characteristics and their distribution within the material is presented for each approach. Finally, an outlook is provided about the potential applications of these resultant nanocomposite materials.

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Silk fibroin a bio-template for synthesis of different shaped gold nanoparticles: Characterization and ammonia detection application

Cited by 15 publications

References 21 publications

Conductive In Situ Reduced Graphene Oxide–Silk Fibroin Bionanocomposites

Conductive In Situ Reduced Graphene Oxide–Silk Fibroin Bionanocomposites

Bio‐mediated synthesis – A sustainable strategy for nanomaterials preparation: A comprehensive bibliometric review

Silk Polymers and Nanoparticles: A Powerful Combination for the Design of Versatile Biomaterials

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