A MINI REVIEW ON PREPARATION, CHARACTERIZATION, AND APPLICATIONS OF SILVER IODIDE NANOPARTICLES (original) (raw)
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Journal of Photochemistry and Photobiology B: Biology, 2014
The study describes a simple and novel method for the synthesis of silver sulfide nanoparticles (Ag2S NPs). The synthesized NPs were characterized by SEM (scanning electron microscope), XRD (X-ray diffraction), particle size analyzer, zeta sizer and EDX (Energy dispersive X-ray). The Ag2S NPs were spherical in shape with an effective diameter size of 30 nm. The synthesized particles possess photocatalytic activity under visible light and exhibited excellent antimicrobial effect. The photocatalytic property of Ag2S NPs was also evaluated by the degradation of methylene blue dye under visible light. NPs degraded 87% of methylene blue with in 1h at pH 8. The NPs of 0.1 μg/mL showed a growth inhibition of more than 75% against S. aureus (ATCC 25923), E. coli (ATCC 13534), and E. coli (ATCC 25922).
Rendiconti Lincei, 2014
Many efforts have led to the development of various methods to modify multi-walled carbon nanotubes (MWCNTs), in recent years, which get derivative materials with more attractive features. In the present work, MWCNT decorated silver nanoparticles (Ag ? NPs), as new hybrid material, which display increased chemical activity due to their large surface to volume ratio and crystallographic surface structure, have been examined toward applications in the area of antimicrobial activity by studying the effect of various exposure times against Gram negative and Gram positive bacteria using viable count technique. Finally, the formation of functional groups such as C=O and OH after treatment with concentrated acid characterized by Fourier transformed infrared spectroscopy, and transmission electron microscopy was used to characterize the occurrence of silver nanoparticle deposition on treated MWCNT structure due to chemical method using silver nitrate (AgNO 3) with a concentration of 0.2 M. Morphological change of bacteria in contact with Ag ? / MWCNTs can be determined using SEM analysis. These observations point to the potential use of MWNTs decorated with silver nanoparticles as building blocks for antimicrobial materials.
International journal of biosensors & bioelectronics, 2019
A great interest for the study of nanoscale chemical species has been studied. This review presents the main methods of chemical reduction for the preparation of silver nanoparticles, such as the preparation of silver particles using NaBH 4 and ascorbic acid as a reducing and stabilizing agent, the preparation of silver particles using PVP as a reducing agent and the preparation of silver particles using DMF as a reducing agent. In addition, the main methods of characterization of silver nanoparticles are presented according to the size and morphology of the nanoparticles and the properties of surface and stability. Finally, the applicability of silver nanoparticles as an antibacterial agent is demonstrated.
IJERT-SYNTHESIS OF SILVER NANOPARTICLES BY CHEMICAL REDUCTION AND THEIR ANTIMICROBIAL ACTIVITY
International Journal of Engineering Research and Technology (IJERT), 2014
https://www.ijert.org/synthesis-of-silver-nanoparticles-by-chemical-reduction-and-their-antimicrobial-activity https://www.ijert.org/research/synthesis-of-silver-nanoparticles-by-chemical-reduction-and-their-antimicrobial-activity-IJERTV1IS6494.pdf In this article we have studied the antimicrobial activity of silver nanoparticles with five different types of bacteria. Silver nanoparticles were chemically synthesized using silver nitrate as a precursor material and tri sodium citrate as reducing agent. UV-Vis spectroscopy and Scanning Tunnelling Microscopy (STM) were used to study the absorption spectra and surface morphology of Silver nanoparticles. The antimicrobial activity of silver nanoparticles was investigated against five different types of microorganisms such as Bacillus subtilis, Bacillus megaterium, Escherichia coli, Salmonella typhimurium, and Staphylococcus aureus.
Silver Nanoparticle Synthesis via Photochemical Reduction with Sodium Citrate
International Journal of Molecular Sciences
The aim of this paper is to provide a simple and efficient photoassisted approach to synthesize silver nanoparticles, and to elucidate the role of the key factors (synthesis parameters, such as the concentration of TSC, irradiation time, and UV intensity) that play a major role in the photochemical synthesis of silver nanoparticles using TSC, both as a reducing and stabilizing agent. Concomitantly, we aim to provide an easy way to evaluate the particle size based on Mie theory. One of the key advantages of this method is that the synthesis can be “activated” whenever or wherever silver nanoparticles are needed, by premixing the reactants and irradiating the final solution with UV radiation. UV irradiance was determined by using Keitz’s theory. This argument has been verified by premixing the reagents and deposited them in an enclosed space (away from sunlight) at 25 °C, then checking them for three days. Nothing happened, unless the sample was directly irradiated by UV light. Furthe...
The Applications of Green Synthesized Silver Nanoparticles: A Review
Eurasian Journal of Science and Engineering
Nanoscience is a fascinating field of study that has made unique outputs and applications both cost-effective and efficient. Significant and outstanding Nano-based applications have been applied in various sectors such as agricultural, food processing, and pharmaceutical sectors. Nanoparticles with sizes ranging from 1 to 100 nm have a significant measure of the relationship between surface area and volume. Because nanomaterials have a higher bioavailability than bigger particles, they can be used as individual cells; organs, and tissues are all examples of this. Silver is considered as the most researched and used material to prepare nanoparticle. Because of their vast range of prospective uses, silver nanoparticles have sparked a lot of attention. Silver nanoparticles are less hazardous to humans, but they are extremely harmful to bacteria. In biomedical applications, silver nanoparticles have been discovered to be useful in antimicrobial, catalysis, human health, and the environment cleanup. Silver nanoparticles are attractive catalytic materials for a variety of applications due to their outstanding optical and electrical characteristics. This article reviewed the synthesis of silver nanoparticles via green approach and important applications such as antimicrobial activity, insecticidal activity, anticancer activity, nanobiosensors, human health applications, environmental applications, painting application and many others.
Bio-synthesis of silver nanoparticles with antibacterial activity
Materials Chemistry and Physics, 2019
Silver nanoparticles (Ag-NPs) have potential applications in life science, food chemistry, biomedicine, photocatalysis and cosmetics fields due to its unique optical, electrical and catalytic properties besides the strong antibacterial property. Apple pomace, a by-product of apple juice production, is ample and easily available. In the present study, this green raw material was used to biosynthesize Ag-NPs for the first time. The obtained silver nanoparticles were investigated by UV-vis, TEM, XRD, and FTIR, respectively. The results showed that the concentration of AgNO 3 and the volume ratio of AgNO 3 solution to apple pomace extract were the important factors affecting the synthesis of silver nanoparticles. When the concentration of AgNO 3 was 10 mmol/L, the volume ratio of AgNO 3 solution to the apple pomace extract of 4:1(ν/ν), Ag-NPs were quickly formed. They were stable with high degree of crystallinity. The particle sizes ranged between 10-20nm and the conversation of silver ions was up to 99%. The bacteriostatic circle tests revealed that the biosynthesized Ag-NPs had a strong antibacterial activity against gram positive bacteria and gram negative bacteria. FTIR analysis demonstrated that some bio-molecules with groups of-NH 2 ,-COOH and-OH were distributed on the surface of the newly synthesized Ag-NPs. During the synthesis of silver nanoparticles, there were not any poisonous reducers and stabilizers introduced.
GREEN SYNTHESIS AND CHARACTERIZATION OF SILVER NANOPARTICLES
Nanoparticles have altered properties because of their size and result of which they have found enormous applications. Silver nanoparticles have been known to have antimicrobial properties. Biological synthesis of nanomaterials are not only ecofriendly but also the nanoparticles synthesized have superior properties than those synthesized using physical and chemical methods. In the present study, silver nanoparticles (AgNPs) were synthesized using various plant extracts like fern, jackfruit, and onion. The effect of varying pH of these extracts on the synthesis of AgNPs was studied, and alkaline medium was found to decrease the time taken for synthesis. The synthesized AgNPs were found to have absorption maxima close to 420 nm, and mean size less than 50 nm. The antimicrobial activity of AgNPs was checked against pathogens like, E. coli, S. aureus, S. pyogenes, S. typhi, S. paratyphi A, S. paratyphi B, Shigella and Proteus. The MIC of these AgNPs against E. coli and S. aureus was determined. It was found that these AgNPs when adsorbed on to activated carbon could be used to disinfect water contaminated with E. coli.
ACS Omega
Plant-mediated nanoparticles are gaining popularity due to biologically active secondary metabolites that aid in green synthesis. This study describes a simple, environmentally friendly, dependable, and cost-effective production of silver nanoparticles utilizing Cucumis sativus and Aloe vera aqueous leaf extracts. The aqueous leaf extracts of Cucumis sativus and Aloe vera, which worked as a reducing and capping agent, were used to biosynthesize silver nanoparticles (AgNPs). The formation of surface plasmon resonance peaks at 403 and 405 nm corresponds to the formation of colloidal Ag nanoparticles. Similarly, the Bragg reflection peaks in X-ray diffraction patterns observed at 2θ values of 38.01°, 43.98°, 64.24°, and 77.12°representing the planes of [111], [200], [220], and [311] correspond to the face-centered cubic crystal structure of silver nanoparticles. Fourier transform infrared spectroscopy confirms that bioactive chemicals are responsible for the capping of biogenic silver nanoparticles. The size, structure, and morphology of AgNPs with diameters ranging from 8 to 15 nm were examined using transmission electron microscopy. Water contamination by azo dyes and nitrophenols is becoming a more significant threat every day. The catalytic breakdown of organic azo dye methyl orange (MO) and the conversion of para-nitrophenol (PNP) into para-aminophenol using sodium borohydride was evaluated using the prepared biogenic nanoparticles. Our nanoparticles showed excellent reduction ability against PNP and MO with rate constants of 1.51 × 10 −3 and 6.03 × 10 −4 s −1 , respectively. The antibacterial activity of the nanomaterials was also tested against four bacteria: Staphylococcus aureus, Klebsiella pneumoniae, Enterobacter, and Streptococcus pneumoniae. These biogenic AgNPs displayed effective catalytic and antibacterial characteristics by reducing MO and PNP and decreasing bacterial growth.