Green synthesis of colloidal silver nanoparticles by sonochemical method (original) (raw)
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Sonochemical Synthesis of Silver Nanoparticles Using Starch: A Comparison
Bioinorganic Chemistry and Applications, 2014
A novel approach was applied to synthesize silver nanoparticles using starch under sonication. Colloidal silver nanoparticles solution exhibited an increase of absorption from 420 to 440 nm with increase starch quantity. Transmission electron microscopy followed by selected area electron diffraction pattern analysis indicated the formation of spherical, polydispersed, amorphous, silver nanoparticles of diameter ranging from 23 to 97 nm with mean particle size of 45.6 nm. Selected area electron diffraction (SAED) confirmed partial crystalline and amorphous nature of silver nanoparticles. Silver nanoparticles synthesized in this manner can be used for synthesis of 2-aryl substituted benzimidazoles which have numerous biomedical applications. The optimized reaction conditions include 10 ml of 1 mM AgNO3, 25 mg starch, 11 pH range, and sonication for 20 min at room temperature.
Scientific Reports
The present study shows the development of a novel sonochemical synthesis pathway of sub-15 nm silver nanoparticles (AgNPs) with quasi-spherical shape and high stability in aqueous suspension. Different analytical techniques such as on-line UV–Vis spectroscopy, Atomic Force Microscopy (AFM), and Transmission Electron Microscopy (TEM) were complementarily used to characterize the evolution of the properties of AgNPs synthesized with this new route. Furthermore, different centrifugation conditions were studied to establish a practical, simple and straightforward purification method. Particle size was determined by TEM employing two different deposition methods, showing that purified AgNPs have a size of 8.1 nm ± 2.4 nm with a narrow dispersion of the size distribution (95% coverage interval from 3.4 to 13 nm). Critical information of the shape and crystalline structure of these sub-15 nm AgNPs, provided by shape descriptors (circularity and roundness) using TEM and high resolution (HR...
Journal of Physics: Conference Series, 2009
Silver nanoparticles with spheres, rods have been prepared by a pulse sonoelectrochemical technique from an aqueous solution of AgNO 3 in the presence of sodium dodecyl sulfate C 12 H 25 NaO 4 S -(SDS). The as-prepared silver nanoparticles are characterized by electron microscopy (TEM, SEM), powder X-ray diffraction (XRD), and UV-vis absorption spectrum. It was found that the concentration of AgNO 3 and SDS affects the shape of the nanoparticles. The crystal size could be varied from 5 nm up to 200 nm by controlling the various electrodeposition and sonic parameters.
Sonochemical synthesis of silver nanorods by reduction of silver nitrate in aqueous solution
Ultrasonics sonochemistry, 2010
The sonochemical synthesis of silver nanorods has been achieved by ultrasonic irradiation of the aqueous solution of silver nitrate, methenamine (HMTA) and poly (vinyl pyrrolidone) (PVP) for 60 min. The silver nanorods obtained have lengths of 4-7 microm and mean diameters of about 100 nm. The structures of the samples were characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), selected area electron diffraction (SAED) and X-ray powder diffraction (XRD), and the chemical composition of the sample was examined by energy-dispersive X-ray spectrum (EDS). The effects of the irradiation time, the concentration of PVP and the reaction temperature on the morphology of silver nanorods were discussed, and the mechanism of the silver nanorods formation was tentatively inferred.
Materials Letters, 2011
Silver nanoparticles have been successfully synthesized by the sonochemical route using sodium borohydride and sodium citrate as the reducing agents. The effect of the reducing agents on the particle size and morphology has been studied by carrying out the two reactions at the same ultrasound frequency (20 KHz). The strong reducing agent (NaBH 4 ) produced spherical silver nanoparticles of sizes 10 nm whereas sodium citrate led to much smaller silver nanoparticles of~3 nm diameter. Powder X-ray diffraction studies reveal a high degree of crystallinity and monophasic silver particles. UV-Visible studies show the presence of a surface plasmon band at 405 nm. However the reflectance spectra give a broad band between 340 and 360 nm which is characteristic for the quasi-spherical silver nanoparticles. The specific surface area was found to be 2.6 and 13.1 m 2 /g and the pore radius was found to be 15.2 and 12.3 Å for silver nanoparticles obtained by the sodium borohydride and sodium citrate reduction respectively.
Ultrasonic-assisted synthesis of starch-stabilized silver nanoparticles
Well-dispersed and uniform starch-stabilized silver nanoparticles (Ag-NPs) with a relatively narrow size distribution are prepared via green chemistry method by ultrasonic procedure. Solutions containing silver ions and starch in water gave starch-capped Ag-NPs, which could be integrated into medical applications such as using in antibacterial wound dressing. Eco-friendly materials as bio-organisms in plant extracts contain polysaccharides, which act as both reducing and capping agents forming stable and size-controlled Ag-NPs. The size of the Ag-NPs decreases with the ultrasonic time. Ultrafine spherical Ag-NPs with a mean particle size of about 8.5 nm have been synthesized under ultrasonic process. X-ray diffraction (XRD), energy-dispersive X-ray analysis (EDX), UV–Vis spectroscopy, and transmission electron microscopy (TEM) are used to characterize the starch-stabilized Ag-NPs.
Chemical vs. Sonochemical Synthesis and Characterization of Silver, Gold, and Hybrid Nanoparticles
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Digest Journal of Nanomaterials and Biostructures, 2016
Silver nanoparticles (Ag-NPs) have been successfully synthesized using ultrasound irradiation in the sodium alginate media. AgNO3 and ultrasound irradiation have been used as silver precursor and physical reducing agent to accelerate the synthesis of Ag-NPs. The presence of Ag-NPs can be detected from the changing color of the suspensions. The silver ion reduction was confirmed through the surface plasmon resonance absorption at around 446 nm. The spherical shape and an average diameter of 24. 59 nm were observed by using Transmission Electron Microscopy. The XRD pattern was assigned that the sodium alginate/Ag-NPs is crystalline in nature with fcc planes. The FT-IR spectra shows that the Ag-NPs do not appear many different with sodium alginate due to van der Waal forces. Therefore, this Ag-NPs using sodium alginate can be an alternative in the metal nanoparticles synthesis due to green and speedy method. Moreover, these nanoparticles can apply in many applications such as anti-micr...
Green synthesis of silver nanoparticles and silver colloidal solutions
Journal of Physics: Conference Series, 2009
In this paper, silver colloidal solutions have been synthesized rapidly in green conditions by using microwave irradiation and non-toxic chemistry substances (acid oxalic, silver nitrate, polyvinyl pyrolidone (PVP; Mw = 55 000)). The particle size and morphology of these solutions can be controlled by altering several factors like the time, the power of microwave exposure, and the ratio of silver oxalate and PVP etc. The silver nanoparticles were fabricated by thermal decomposition of silver oxalate. The synthesized silver colloidal solutions and silver nanoparticles were characterized by several analytical techniques like UV-VIS, XRD, TEM, FESEM/EDS and ICP-AAS studies. Finally, we used the synthesized silver colloidal solutions for antibacterial purpose. The obtained results showed that the synthesized silver colloidal solutions, even at very low concentrations, have highly efficient anti-bacterial property.
The Influence of Silver Nanoparticles Synthesis on Their Properties
Acta Polytechnica
Application of green methods to replace physical and chemical methods for synthesis of silver nanoparticles (AgNPs) has become necessary not only from economic aspect but especially due to its significant impact on ecosystem. The properties of biologically synthesized AgNPs using green algae Parachlorella kessleri (P. kessleri) and chemically prepared were investigated and compared. The UVvis analysis confirmed a high stability of biosynthesized AgNPs as well as chemically synthesized gelatin modified citrate-AgNPs. Scanning electron microscopy (SEM) and Transmission electron microscopy (TEM) revealed different sizes and shapes of AgNPs synthesized in different ways. Biosynthesized AgNPs have similar inhibitory antimicrobial activity as gelatin/sodium citrate–AgNPs.