SYNTHESIS AND CHARACTERISATION OF SILVER NANOPARTICLES IN THE PRESENCE OF PVA AND TANNIC ACID (original) (raw)
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Research on Chemical Intermediates, 2010
Importanţa nanoparticulelor metalice este dată de performanţele lor magnetice, electronice şi optice. Ca urmare a proprietăţilor specifice, ele au multe aplicaţii ca biosenzori şi catalizatori în biomedicină şi in domeniului mediului. Scopul acestei lucrări este prezentarea metodei de obţinere şi analiză a filmelor polimerice pe bază de Ag/alcool polivinilic/acid tanic. Nanoparticulele de Ag au fost preparate prin reducerea AgNO 3 utilizând diferiţi agenţi de reducere (alcool polivinilic sau acid tanic) prin sinteză în câmp de microunde. Nanoparticulele de Ag (soluţii şi film) au fost caracterizate prin spectroscopie UV -VIS , FTIR şi DLS (Dinamic Light Scattering).
Synthesis and characterization of silver nanoparticles
2007
Silver nanoparticles have received considerable attention due to their attractive physical and chemical properties. The surface plasmon resonance and large effective scattering cross section of individual silver nanoparticles make them ideal candidates for molecular labeling, where phenomena such as surface enhance Raman scattering (SERS) can be exploited. In addition, silver nanoparticles have recently been shown to be a promising antimicrobial material. In the present research silver colloid was produced by sodium citrate reduction. The colloidal silver was incorporated by dip-coating to the polymer substrate. X-Ray Fluorescence Spectroscopy (XRF), Atomic force microscopy (AFM), ultraviolet-visible spectroscopy (UV-VIS ) and SERS indicate that the produced structures include metallic crystalline silver nanoparticles. The surface plasmon resonance peak in absorption spectra of silver particles showed an absorption maximum at 420-500 nm. The silver - polymer nanocomposites structures with selective light properties as a result of plasmon resonance shifting in the UV-VIS wavelength region were produced.
Optical and structural studies of silver nanoparticles
Radiation Physics and Chemistry, 2004
Gamma radiolysis method was used to prepare polyvinyl alcohol (PVA) capped silver nanoparticles by optimizing various conditions like metal ion concentration and polymer (PVA) of different molecular weights. The role of different scavengers was also studied. The decrease in particle size was observed with increase in the molecular weight of capping agent. g-radiolytic method provides silver nanoparticles in fully reduced and highly pure state. XRD (X-ray diffraction) technique confirmed the zero valent state of silver. Optical studies were done using UV-visible spectrophotometer to see the variation of electronic structure of the metal sol. Transmission Electron Microscopic (TEM) studies reveal the fcc geometry. The TEM show clearly split Debye-Scherrer rings. The d values calculated from the diffraction ring pattern are in perfect agreement with the ASTM data. Ag particles less than 10 nm are spherical in shape, whereas the particles above 30 nm have structure of pentagonal biprisms or decahedra, referred to as multiply twinned particles.
Spectral Study of Silver Nanoparticles Prepared by Chemical Method
Silver nanoparticles were prepared by the reduction of silver salt (silver nitrate AgNO3) solution using three different methods. The main differences between these methods is by belong to the reducing agent. It is found that the prepared silver nanoparticle was pure and stable for long time. UV-VIS spectrometry indicated formation of spherical silver nano particles. The surface plasmon resonance peaks in absorption spectra for silver colloidal solution showed that the absorption maximum range was at 380- 420 nm. The structures are confirmed by X-ray diffraction (XRD) and the crystallite size was determined from X-ray line broadening using the Scherrer's equation and it was about 32 nm.AFM measurements show that silver nano particles have the average diameter of 69.39 nm and 81.91 nm.
Biological Sciences SYNTHESIS AND CHARACTERIZATION OF SILVER NANOPARTICLES
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Silver nanoparticles exhibit new optical properties, which are observed neither in molecules nor in bulk metals. In the present study silver nanoparticle colloid was produced by chemical reduction method of silver salt (silver nitrate AgNO3) solution. The silver nanoparticles were characterized by using UV-VIS spectrometer and Scanning Electron Microscope (SEM). The Surface Plasmon Resonance peak in absorption spectra of silver colloidal solution showed an absorption maximum at 450 nm which indicated formation of silver nanoparticles. The size range 44nm to 56.55nm of silver nanoparticles was determined by using Scanning Electron Microscope (SEM). The absorbance range of prepared silver nanoparticles solution was checked on 1 st day, 5 th day, 18 th day and on 30 th day. There was no obvious change observed in peak position for 30 days, depicting the stability of Silver nanoparticles.
Chemical and Physical Analyses of Synthesized Silver Nanoparticles
Vanderbilt Undergraduate Research Journal, 2013
Although silver has long been used as an antimicrobial agent, it is not used often due to economical and environmental concerns. However, silver nanoparticles (AgNPs) have the same properties as elemental silver and can be synthesized on a considerably more economical level. The objective of this study was to synthesize AgNPs and analyze their physical, chemical, and antimicrobial properties. The first portion of this study consisted of synthesizing AgNPs of 5nm, 35nm, 40nm, and 60nm lengths, using diluted lab solutions and sterile techniques. The physical analysis of the AgNPs was performed through visual color comparisons of their varied sizes, which confirmed their successful synthesis. A chemical analysis was then conducted using ultraviolet-visible spectroscopy, which measured their absorbance at a 635nm wavelength. Finally, the antimicrobial property of the AgNPs was investigated by inoculating a strain of Staphylococcus aureus with titrated concentrations of varied nanopartic...
The study on the stability of silver nanoparticles by using simple spectrophotometric method
2012
Silver nanoparticles using different concentrations of AgNO3 precursor were successfully synthesized using sodium borohydride as the reducing and capping agent. This study investigated the stability of silver nanoparticles at two different silver nitrate concentrations using a simple UV-Vis Spectroscopic technique. The UV-Vis spectroscopy confirmed the formation of silver nanoparticles by exhibiting the typical surface plasmon absorption maxima ranging from 390-408 nm for higher (10-3M) AgNO3 concentration, whereas for lower (10-4M) AgNO3 concentrations, we observed variation in the SPR band which can be attributed to aggregation of Ag NPs. During this study, we concluded that nanoparticles at lower AgNO3 concentration were much more stable than nanoparticles at higher AgNO3 concentration. The synthesized Ag NPs may have many potential applications such as antibacterial, antifungal, catalyst and sensor etc.
Silver Nanoparticles -A Review
S ilver has been used extensively from last 5000 years for its antibacterial nature. Ag is preferred as nanoparticle for the reason that it has antibacterial property and nontoxic to human beings. Either killing or reducing the growth of bacteria without affecting surrounding cells is known as antibacterial activity. Various methods are used for preparation of silver nanoparticles like physical, chemical and biological. Demand of silver nanoparticle is increasing rapidly in many of the streams like in medical, pharmaceutical companies, healthcare, food, consumer, cosmetics etc. Due to its uses it has been used for its several applications like antibacterial properties, household, medical devices, and food industry, wound dressing, in diagnostic, orthopaedics and an anticancer agent. [1] These nano-sized particles are found to be in unique in nature and are also able to change their physical, chemical and biological property that's why they can be exploited in for various purposes. Various methods are used for the synthesis of these AgNP to fulfil the requirements of AgNPs. [2] Normally, physical and chemical methods are found to be costly and dangerous. But the nanoparticles that are prepared from biological method they show high yield, high solubility as well as high stability. Out of all three methods biological method is found to be simple, environmental, commercial and single step method and doesn't need elevated temperature, pressure, force and deadly chemicals. [3] Differ-Demand of silver nanoparticle (AgNPs) is increasing rapidly in many of the streams like in medical, pharmaceutical companies, healthcare, food, consumer, cosmetics etc. Due to its uses it has been used for its several applications like antibacterial properties, household, medical devices, and food industry, wound dressing, in diagnostic, orthopaedics and an anticancer agent. These nano-sized particles are found to be in unique in nature and are also able to change their `physical, chemical and biological property that's why they can be exploited in for various purposes. Methods for preparation for preparation of AgNPs are physical, chemical and biological.. Out of all three methods biological method is found to be simple, environmental, commercial and single step method and doesn't need elevated temperature, pressure, force and deadly chemicals. Before application of nanoparticles in any of the purpose like medicine, human welfare, or in healthcare industry, it is very important to characterize the prepared nanoparticles so as to check the safety issue of any of the prepared nanoparticle. Analytical techniques that are used for the analysis of this AgNPs are UV-Vis spectroscopy, XRD, FTIR, DLS, XPS, SEM, TEM, AFM etc. AgNPs have applications like anticancer, antifungal, anti-bacterial, anti-cancer etc.
Silver Nanoparticles: Synthesis, Characterization and Applications
InTech eBooks, 2018
Day by day augmenting importance of metal nanoparticles in the versatile fields like, catalyst, electronic, magnetic, mechanic, optical optoelectronic, materials for solar cell and fuel cell, medical, bioimaging, cosmetic, ultrafast data communication and optical data storage, etc, is increasing their value. Nanoparticles of alkali metals and noble metals (copper, silver, platinum, palladium, and gold, etc.) have a broad absorption band in the visible region of the electromagnetic spectrum of light, because the solutions of these metal nanoparticles show the intense color, which is absent in their bulk counterparts as well as their atomic level. The main cause behind this phenomenon is attributed to the collective oscillations of the free conductive electrons that are induced by an interaction with electromagnetic field. The whole incidence is known as localized surface plasmonic resonance. Out of these, we have selected the silver nanoparticles for the studies. In this article, we will discuss the synthesis, characterization, and application of the silver nanoparticles. Future prospective and challenges in the field commercialization of the nanosilver is also discussed.
Current Research on Silver Nanoparticles: Synthesis, Characterization, and Applications
Journal of Nanomaterials
Over the past couple of decades, nanomaterials have advanced the research in materials; biomedical, biological, and chemical sciences; etc., owing to their peculiar properties at the nanoregime compared to their bulk composition. Applications of nanoparticles in the fields like medicine and agriculture have been boosted due to the development of different methodologies developed to synthesize specific shapes and sizes. Silver nanoparticles have tunable physical and chemical properties, so it has been studied widely to improve its applicability. The antimicrobial properties of Ag NPs are finding their application in enhancing the activity of drugs (like Amphotericin B, Nystatin, Fluconazole) and composite scaffolds for controlled release of drugs and targeted delivery of drugs due to their low toxicity and biocompatibility. Similarly, their surface plasmon resonance property makes Ag NPs a top-notch material for developing (bio)sensors, for instance, in surface-enhanced Raman spectro...