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 19 publications

(5 citation statements)

References 21 publications

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“…In situ NP synthesis can be achieved from metal-ion salts with an external reducing agent or using silk itself as a reductant. However, this methodology results in an uncontrolled NP size, morphology, and state of aggregation, ,,,− which greatly impact their physical behavior upon use. These drawbacks can be overcome by a controlled synthesis of NPs upstream and their addition either into the SF dispersion or directly into the SF material. − The latter procedure often preferred as a problem of incompatibility of SF solution with NPs has already been reported, resulting in incontrollable gelation of SF and aggregation of NPs .…”

Section: Introductionmentioning

confidence: 99%

Gold, Silver, and Iron Oxide Nanoparticle Incorporation into Silk Hydrogels for Biomedical Applications: Elaboration, Structure, and Properties

Marín

Egles

Humblot

et al. 2021

ACS Biomater. Sci. Eng.

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Silk fibroin (SF) is a versatile material with biodegradable and biocompatible properties, which make it fit for broad biomedical applications. In this context, the incorporation of nanosized objects into SF allows the development of a variety of bionanocomposites with tailored properties and functions. Herein, we report a thorough investigation on the design, characterization, and biological evaluation of SF hydrogels incorporating gold, silver, or iron oxide nanoparticles. The latter are synthesized in aqueous media using a biocompatible ligand allowing their utilization in various biomedical applications. This ligand seems to play a pivotal role in nanoparticle dispersion within the hydrogel. Results show that the incorporation of nanoparticles does not greatly influence the mechanism of SF gelation and has a minor impact on the mechanical properties of the so-obtained bionanocomposites. By contrast, significant changes are observed in the swelling behavior of these materials, depending on the nanoparticle used. Interestingly, the main characteristics of these bionanocomposites, related to their potential use for biomedical purposes, show the successful input of nanoparticles, including antibacterial properties for gold and silver nanoparticles and magnetic properties for iron oxide ones.

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Section: Introductionmentioning

confidence: 99%

Gold, Silver, and Iron Oxide Nanoparticle Incorporation into Silk Hydrogels for Biomedical Applications: Elaboration, Structure, and Properties

Marín

Egles

Humblot

et al. 2021

ACS Biomater. Sci. Eng.

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

Cited by 19 publications

References 21 publications

Gold, Silver, and Iron Oxide Nanoparticle Incorporation into Silk Hydrogels for Biomedical Applications: Elaboration, Structure, and Properties

Gold, Silver, and Iron Oxide Nanoparticle Incorporation into Silk Hydrogels for Biomedical Applications: Elaboration, Structure, and Properties

Conductive In Situ Reduced Graphene Oxide–Silk Fibroin Bionanocomposites

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

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