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Colloidal silver nanoparticles (AgNPs) with particle size less than 10 nm and concentration of 2 mM/L (~200 mg/L) were synthesized by gamma Co-60 ray irradiation of Ag+/chitosan solutions with different chitosan concentration of 0.5%, 1% and 2% (w/v). Incorporation of AgNPs onto cotton fabric was carried out by padding method with 100% wet pick-up....
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... UV-Vis spectra of 2 mM AgNPs stabilized by 0.5%, 1% and 2% chitosan and TEM images with particle size distribution were shown in Figure 1 and Figure 2, respectively. Table 1 summarized the value of optical density (OD), maximum absorption wavelength (λ max ) and average diameter (d) of AgNPs synthesized in different chitosan concentra- tions. ...
Citations
... e UV-Vis absorption spectra ( Figure S3, Supplementary Materials) for the solution obtained from Ch-TQ-AgNPs and Ch-TAMPy-AgNPs showed absorption bands near 420 nm related to the silver surface plasmon. is indicates complete conversion of silver ions (Ag+) to Ag o (AgNPs) [47]. e AgNPs formed by using two modified chitosan 6 and 7 were found to be very stable for 5-6 months; this might be due to the presence of the hydroxyl group in the chitosan skeleton which prevents agglomeration of AgNPs [48][49][50]. ...
Herein, we described the modification of chitosan with cyanuric chloride as a mediator for preparation of chitosan-s-triazinyl-bis(2-aminomethylpyridine) and chitosan-s-triazinyl-bis(8-oxyquinoline) derivatives to be used as reagents for preparation of silver nanoparticles under ecofriendly conditions. These two reagents are convenient and effective for reduction of silver ions to silver nanoparticles with particle size less than 10 nm that might be suitable for industrial and medicinal applications. The formation and particle size of AgNPs are characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), scanning electron microscope (SEM), and energy-dispersive X-ray analysis (EDX). The antimicrobial activity of the two modified chitosan-s-triazine-AgNPs was evaluated against activities against Gram-positive bacteria (M. luteus ATCC 10240 and MRSA ATCC 43300), Gram-negative bacteria (E. coli ATCC 25922 and P. aeruginosa ATCC 75853), and C. albicans. The results showed that chitosan-s-triazinyl-bis(2-aminomethylpyridine) AgNPs showed high antimicrobial activities against all the tested microorganisms, while their analogous chitosan-s-triazinyl-bis(8-oxyquinoline) AgNPs showed moderate activities.
... Gamma irradiation synthesized silver nanoparticles having particle size 10 nm were incorporated cotton fabric by padding method [64]. Colloidal silver nanoparticles were successfully prepared using chitosan as a preservative and hydroxyl free radical scavenger. ...
This survey outlines the impact of nanoparticles and the importance of nanotechnology in textiles materials. It shows a unique move to nanomaterials as another instrument to enhance the properties and addition of multi-functionalities. Human security and prosperity are undermined by organisms causing various irresistible sicknesses bringing about a substantial number of deaths every year. Currently, nanotechnology is considered the most interesting technology for smart textile commercial applications; since it allows the permanent and effective functionalization of substrate without affecting their macrosacle properties, such as breathability and comfortability. Nanoparticles as antimicrobial agents have got extensive consideration in both scholarly and mechanical researchers due to their biological activity. Beside this, polymeric covered nanoparticles based materials have increased much consideration because of progression in polymer science and innovation. This survey article likewise addresses the production and distribution of nanoparticles for biomedical textile applications.
... This can orient Ag NPs to the GO's matrix (Scheme 1). The influence of the low molecular weight CS and the experiment was carried out at room temperature, therefore its effect on the increase in Ag NPs size during promoting nucleation [42][43][44]. ...
In this study, the physicochemical and surface properties of the GO–Ag composite promote a synergistic antibacterial effect towards both Gram-negative Escherichia coli (E. coli) and Gram-positive Staphylococcus aureus (S. Aureus) bacteria. GO–Ag NPs have a better bactericidal effect on E. coli (73%) and S. Aureus (98.5%) than pristine samples (pure Ag or GO). Transmission electron microscopy (TEM) confirms that the GO layers folded entire bacteria by attaching to the membrane through functional groups, while the Ag NPs penetrated the inner cell, thus damaging the cell membrane and leading to cell death. Cyclic voltammetry (CV) tests showed significant redox activity in GO–Ag NPs, enabling good catalytic performance towards H2O2 reduction. Strong reactive oxygen species (ROS) in GO–Ag NPs suggests that ROS might be associated with bactericidal activity. Therefore, the synergy between the physicochemical effect and ROS production of this material is proposed as the mechanism of its antibacterial activity.
... Since long back, silver-based compounds have been used as antibacterial agent as they have strong antibacterial properties against various microorganisms [63][64][65][66][67][68][69][70][71][72]. Earlier studies have shown the antibacterial activity of biosynthesized NPs [73][74][75]29]. AgNPs have small size but a larger surface area, which contribute to the antibacterial activity of AgNPs [76][77]. ...
In the present study silver nanoparticles (AgNPs) have been synthesized through the cell-free extracts of the rooftop dwelling cyanobacterium Scytonema geitleri HKAR-12. UV-VIS spectroscopy, FTIR, X-ray diffraction, SEM and TEM were used for the determination of morphological, structural and optical properties of synthesized AgNPs. Extracts of Scytonema geitleri HKAR-12 have the ability to reduce AgNO 3 to Ag 0. Sharp peak at 422 nm indicated the rapid synthesis of AgNPs. FTIR results showed the presence of different groups responsible for the reduction of AgNO 3 to AgNPs. XRD pattern confirmed the crystalline nature of AgNPs. SEM showed the bead shape structure of AgNPs. TEM confirmed the actual size of AgNPs to be ranging between 9-17 nm. AgNPs showed antibacterial activity against Pseudomonas aeruginosa, Escherichia coli strain1 and E. coli strain 2 and 11 μg/mL of AgNPs effectively inhibited the growth of MCF-7 cells. Hence, Scytonema geitleri HKAR-12, isolated from the rooftop could serve as a desirable biological candidate for convenient and cheap production of AgNPs having antimicrobial and anti-cancerous properties.
... The introduction of AgNPs into biological dressings was demonstrated to be a beneficial method to prevent wound infection and promote wound healing [112]. Hien et al. investigated the influence of CS polymer for binding the AgNPs to cotton fibers [113]. The spherical AgNPs with sizes less than 10 nm were synthesized by Co-60 ray irradiation in CS media and later incorporated onto cotton fabric. ...
... The spherical AgNPs with sizes less than 10 nm were synthesized by Co-60 ray irradiation in CS media and later incorporated onto cotton fabric. The results from antibacterial activity against S. aureus showed that AgNPs incorporated onto cotton fabric exhibited the highest antibacterial activity [113]. Another very interesting subsection of plasmonic nanoparticle research is plasmonic nanoparticles with anisotropic shapes. ...
... Enhance antibacterial activity and overcome concerns about human and environmental safety related to usage of these metal nanoparticles [109] CS-stabilized silver nanoparticles in presence of cotton fabric Antibacterial activity of cotton fabrics [113] Silk fibroin/carboxymethyl, CS-stabilized AgNPs ...
Chitosan (CS) is a natural polymer derived from chitin that has found its usage both in research and commercial applications due to its unique solubility and chemical and biological attributes. The biocompatibility and biodegradability of CS have helped researchers identify its utility in the delivery of therapeutic agents, tissue engineering, wound healing, and more. Industrial applications include cosmetic and personal care products, wastewater treatment, and corrosion protection, to name a few. Many researchers have published numerous reviews outlining the physical and chemical properties of CS, as well as its use for many of the above-mentioned applications. Recently, the cationic polyelectrolyte nature of CS was found to be advantageous for stabilizing fascinating photonic materials including plasmonic nanoparticles (e.g., gold and silver), semiconductor nanoparticles (e.g., zinc oxide, cadmium sulfide), fluorescent organic dyes (e.g., fluorescein isothiocyanate (FITC)), luminescent transitional and lanthanide complexes (e.g., Au(I) and Ru(II), and Eu(III)). These photonic systems have been extensively investigated for their usage in antimicrobial, wound healing, diagnostics, sensing, and imaging applications. Highlighted in this review are the different works involving some of the above-mentioned molecular-nano systems that are prepared or stabilized using the CS polymer. The advantages and the role of the CS for synthesizing and stabilizing the above-mentioned optically active materials have been illustrated.
This article provides a comprehensive understanding of development of textiles functionalized with silver nanoparticles (AgNPs). There are three established methods to fabricate textiles functionalized with AgNPs, namely, solution‐immersion, layer‐by‐layer deposition, and sonochemical. In addition, several textile types such as cotton, wool, polyester, silk, cotton/polyester blend, polyamide, and regenerated cellulose have been used for the fabrication. The AgNP deposition mechanism on textiles is mainly due to electrostatic interaction between AgNPs and textile constituents. It was exhibited that the deposition of AgNPs on textiles can transform their textiles colors. In addition, it was demonstrated that the deposition of AgNPs on textiles is not permanent, particularly against washing treatment. Textiles modified with AgNPs have several promising applications such as antibacterial, antifungal, catalyst, electronic devices, water treatment, sun protection, air treatment, and surface‐enhanced Raman scattering, which are comprehensively discussed in this article. Future challenges in fabricating textiles functionalized with AgNPs remain on how this can be carried out to improve long‐term stabilization of AgNPs on textiles to achieve their permanent deposition by employing greener approaches.
