Silver-decorated gel-shell nanobeads: physicochemical characterization and evaluation of antibacterial properties (original) (raw)
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Activity of Antimicrobial Silver Polystyrene Nanocomposites
Journal of Nanomaterials, 2012
A simple technique based on doping polymers within situgenerated silver nanoparticles (Ag/PS films) has been developed. In particular, an antiseptic material has been prepared by dissolving silver 1,5-cyclooctadiene-hexafluoroacetylacetonate in amorphous polystyrene, and the obtained solid solution has been heated for ca. 10 s at a convenient temperature (180°C). Under such conditions the metal precursor decomposes producing silver atoms that diffuse into the polymer and clusterize. The antimicrobial characteristics of the resulting polystyrene-based material have been accurately evaluated towardEscherichia coli (E. coli)comparing the cytotoxicity effect of 10 wt.% and 30 wt.% (drastic and mild annealing) silver-doped polystyrene to the corresponding pure micrometric silver powder. Two different bacterial viability assays were performed in order to demonstrate the cytotoxic effect of Ag/PS films on culturedE. coli: (1) turbidimetric determination of optical density; (2) BacLight flu...
Enhanced bioactivity of polystyrene-silver nanocomposite (PS/Ag NCs)-an antimicrobial study
NANOSCIENCE AND NANOTECHNOLOGY: NANO-SciTech
Polystyrene has been widely used as everyday materials and silver has been found as an anti-bacterial agent. Combination of polystyrene and silver into a polymer-metal composites (PS/ Ag NCs) could merge both properties. Polystyrene can be modify through many routes, while silver nanoparticles can be manipulated to serve as antimicrobial and drug delivery agent. The present study uses expanded polystyrene which was dissolved in Tetrahydrofuran (THF) and doped with silver nanoparticles synthesized through leaf extract of Parthenium. The PS/Ag NCs were investigated by UV-Vis spectroscopy and Atomic Force Microscopy (AFM). The analysis of various synthesis of PS/Ag NCs with different PS:Ag ratio create complex nanocomposites. UV-Vis spectrum of 435 nm indicated the effect of Localize Surface Plasmon resonance of silver nanosize confirmed the nanosize of Silver nanoparticles that are ready to be used anti-bacterial agent. Future works will be looked into modifying the polymer (Polystyrene) structure to be used as attachment surfaces for drug molecules for drug delivery system, thus serves as bi-functional composite that not only useful for drug delivery system and as anti-bacterial agent as well.
Synthesis and characterization of silver nanoparticles for antibacterial activity
This article presents a study about the synthesis of colloidal silver (Ag)/biopolymer where Ag submicron particles were prepared in situ on bacterial cellulose (BC) produced by Gluconacetobacter xylinus. Different reducing agents were compared (hydrazine, hydroxylamine or ascorbic acid) together with the influence of gelatin or polyvinylpyrrolidone (PVP) employed as colloid protectors. Particle size distribution and morphology were investigated by scanning electron microscope (SEM). SEM images show silver nanoparticles (40-100 nm) size range attached on (BC) microfibrils. XRD analyses confirmed the Ag cubic phase deposited on to BC fibrils. The ash contents determined by thermogravimetric analyses have indicated high level of silver loading on the obtained composites.
An antibacterial coating based on a polymer/sol-gel hybrid matrix loaded with silver nanoparticles
Nanoscale research letters, 2011
ABSTRACT: In this work a novel antibacterial surface composed of an organic-inorganic hybrid matrix of tetraorthosilicate and a polyelectrolyte is presented. A precursor solution of tetraethoxysilane (TEOS) and poly(acrylic acid sodium salt) (PAA) was prepared and subsequently thin films were fabricated by the dip-coating technique using glass slides as substrates. This hybrid matrix coating is further loaded with silver nanoparticles using an in situ synthesis route. The morphology and composition of the coatings have been studied using UV-VIS spectroscopy and atomic force microscopy (AFM). Energy dispersive X-ray (EDX) was also used to confirm the presence of the resulting silver nanoparticles within the thin films. Finally the coatings have been tested in bacterial cultures of genus Lactobacillus plantarum to observe their antibacterial properties. It has been experimentally demonstrated that these silver loaded organic-inorganic hybrid films have a very good antimicrobial behavi...
Enhancement of antibacterial properties of various polymers functionalized with silver nanoparticles
Biointerface Research in Applied Chemistry, 2019
A new green deposition of silver nanoparticles (AgNPs) on polymers was proposed in this work. In-situ synthesis of AgNPs on polymers was achieved via a green procedure using natural reducing agents, which are Ageratum conyzoidez and Mikania micrantha. Several characterizations of the treated polymers such as color transformation, surface morphology, elemental contents, and water absorption were comprehensively evaluated. For the application, the treated polymers were then tested against waterborne bacteria, which are Escherichia coli and Bacillus cereus. Rapid deposition of AgNPs via the presently biological method can be successfully achieved as observed via surface morphology analysis and energy dispersive X-ray investigation. Water absorption capabilities of the polymers can be decreased after attaching with AgNPs, which can also probably contribute to the enhancement of their antibacterial activities. This study observed that the treated polymers showed excellent antibacterial a...
Polymer-Silver Nanocomposites as Antibacterial materials
The antibacterial effect of silver has been used in a variety of commercially available products and medical devices for many years, either in its metallic or salt form. Nowadays, due to the knowledge acquired within the last decade in the field of Nanoscience and Nanotechnology, the use of silver nanoparticles (AgNPs) for medical and sanitary purposes has been thoroughly studied and dramatically increased. One of the major concerns dealing with the use of AgNPs in human health and disinfection is, in fact, its toxicity what dictates the need to use safe strategies for AgNPs applications. Nanocomposites are a good approach since the mobility of the nanoobjects is reduced whereas their activity remains. In this context, the Intermatrix Synthesis technique provides a novel route for both synthesis and immobilisation of AgNPs in commercially available ion-exchange matrices. This chapter reviews the state-of-the-art of the nanotechnological approach in bactericidal application of AgNPs ...
Journal of Materials …
In the present study, we report enhanced antimicrobial properties of 29 and 23 nm silver nanoparticles (Ag NPs) obtained by electrochemical synthesis in poly (amide-hydroxyurethane) media. Antibacterial activity assessed by disk diffusion method indicates that silver nanoparticles produced inhibition zones for both Escherichia coli and Staphylococcus aureus depending on silver concentration. The bacterial growth curve performed in the presence of silver nanoparticles showed a stronger antibacterial effect at lower concentrations than those described in the earlier reports. The effect was both dose and size dependent and was more pronounced against Gram negative bacteria than Gram positive one. The smallest Ag NPs used had a bactericidal effect resulting in killing E. coli cells. Scanning electron microscopy analysis indicated major damage and morphology changes of the silver nanoparticles treated bacterial cells. The major mechanism responsible for the antibacterial effect probably consists in clusters formation and nanoparticles anchorage to the bacterial cell surface.
Chemistry International, 2020
This research work presents a facile and green route for synthesis silver sulfide (Ag2SNPs) nanoparticles from silver nitrate (AgNO3) and sodium sulfide nonahydrate (Na2S.9H2O) in the presence of rosemary leaves aqueous extract at ambient temperature (27 oC). Structural and morphological properties of Ag2SNPs nanoparticles were analyzed by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The surface Plasmon resonance for Ag2SNPs was obtained around 355 nm. Ag2SNPs was spherical in shape with an effective diameter size of 14 nm. Our novel approach represents a promising and effective method to large scale synthesis of eco-friendly antibacterial activity silver sulfide nanoparticles.
Synthesis, Characterization and Antimicrobial Properties of Silver Nanocomposites
Silver Nanoparticles - Fabrication, Characterization and Applications, 2018
Nanoparticles and polymers in their respective fields have contributed greatly in the form of science and hence in daily life application products. But due to lack in emerging technologies for developing silver nanocomposites with polymers and other materials, the nanoparticle-based products have conquered little less attention. Hereby, an effort is made to put a light on already developed functional materials containing silver nanoparticles and also to look forward their scope in daily life applications. A little more insight into antimicrobial properties of such materials will also be elaborated. Finally, the optimal amounts of silver that cannot be health hazardous to living being especially human and overall environmental impacts of Nanocomposites are presented.