scholarly journals THE INFLUENCE OF SILVER NANOPARTICLES SYNTHESIS ON THEIR PROPERTIES

2018 ◽  
Vol 58 (6) ◽  
pp. 365-369 ◽  
Author(s):  
Anna Mražíková ◽  
Oksana Velgosová ◽  
Jana Kavuličová ◽  
Stanislav Krum ◽  
Jaroslav Málek
Keyword(s):  
Electron Microscopy ◽  
Silver Nanoparticles ◽  
High Stability ◽  
Sodium Citrate ◽  
Chemical Methods ◽  
Transmission Electron ◽  
Parachlorella Kessleri ◽  
Biosynthesized Agnps ◽  
Physical And Chemical ◽  
Scanning Electron

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.

scholarly journals SILVER NANOPARTICLES FROM MEDICINALLY IMPORTANT EUPHORBIA CYATHOPHORA EXTRACT: BIOSYNTHESIS, CHARACTERIZATION, AND ANTICANCER ACTIVITY.

2018 ◽  
Vol 11 (2) ◽  
pp. 154
Author(s):  
Robert Lotha ◽  
Aravind Sivasubramanian ◽  
Meenakshi Sundaram Muthuraman
Keyword(s):  
Electron Microscopy ◽  
Silver Nanoparticles ◽  
Cell Line ◽  
Aqueous Extract ◽  
Visible Spectroscopy ◽  
X Ray ◽  
Transmission Electron ◽  
The Stability ◽  
Ht 29 ◽  
Scanning Electron

Objective: The present study was aimed at the biosynthesis of silver nanoparticles (AgNPs) using aqueous extract of Euphorbia cyathophora leavesand testing their anticancer potential using HT-29 cell line model.Methods: Green synthesis of silver nanoparticles was obtained with the aqueous extract of E. cyathophora. The synthesized nanoparticles wereconfirmed initially by ultraviolet-visible spectroscopy. Further, scanning electron microscopy, transmission electron microscopy, and X-Ray diffractionstudies also ensured the presence of silver nanoparticles. Zeta potential studies revealed the stability of the silver nanoparticles.Results: Antioxidant and anticancer studies of the nanoparticles against HT-29 cell line exhibited remarkable results.Conclusion: This ensures that the synthesized nanoparticles play an important role in medicinal biology.

Loading AKBA on surface of silver nanoparticles to improve their sedative-hypnotic and anti-inflammatory efficacies

Nanomedicine ◽  
2019 ◽  
Vol 14 (21) ◽  
pp. 2783-2798
Author(s):  
Ajmal Khan ◽  
Ahmed Al-Harrasi ◽  
Najeeb Ur Rehman ◽  
Rizwana Sarwar ◽  
Touqeer Ahmad ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Silver Nanoparticles ◽  
Water Solubility ◽  
Boswellic Acid ◽  
Transmission Electron ◽  
Anti Inflammatory ◽  
Compound Materials ◽  
Dose Dependent ◽  
Scanning Electron

Aim: Acetyl-11-keto- β-boswellic acid (AKBA) is a potent anti-inflammatory compound limited by its low water solubility and bioavailability. To load AKBA on silver nanoparticles (AgNPs) to improve bioavailability and water solubility of the compound. Materials & methods: AKBA-AgNPs were chemically synthesized and characterized by UV–Vis spectrophotometry, Fourier transform infrared spectroscopy, scanning electron microscopy and transmission electron microscopy. AKBA and AKBA-Ag were studied for their sedative-hypnotic and anti-inflammatory efficacies. Results: Pretreatment with AKBA or AKBA-Ag caused significant dose-dependent sedative-hypnotic effects at 5 and 10 mg/kg intraperitoneal. The effects of AKBA-loaded AgNPs caused pronounced changes in mice compared with those of AKBA, and the AKBA-AgNPs demonstrated anti-inflammatory effects that were superior to those of AKBA. Conclusion: The loading of AKBA on nanoparticles improved its pharmacokinetic effects, and capacity for drug delivery.

Electrospun Antibacterial Chitosan/Poly (Vinyl Alcohol) Nanofibers Containing Silver Nanoparticles

2010 ◽  
Vol 152-153 ◽  
pp. 1333-1336 ◽  
Author(s):  
Xu Pin Zhuang ◽  
Zheng Li ◽  
Wei Min Kang ◽  
Bo Wen Cheng
Keyword(s):  
Electron Microscopy ◽  
Silver Nanoparticles ◽  
Photoelectron Spectroscopy ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Electrospun Fibers ◽  
X Ray ◽  
High Antibacterial Activity ◽  
Transmission Electron ◽  
Scanning Electron

New chitosan/poly (vinyl alcohol) (PVA) nanofibers functionalized with silver nanoparticles were electrospun using solutions of PVA blended with silver nanoparticles-chitosan composites. The structure of the electrospun fibers were studied with the aid of scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. The results indicated that the electrospun fibers smoothly with 220 to 650 nm diameter, and the silver nanoparticles were successfully embed into the fibers which show high antibacterial activity against E.coli.

The Analyses of Anthropogenic Atmospheric Particulates by EM

1990 ◽  
Vol 48 (2) ◽  
pp. 547-547
Author(s):  
Philip A. Russell
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Fine Particles ◽  
Analytical Techniques ◽  
Bulk Sample ◽  
Airborne Particulates ◽  
Discrete Particle ◽  
Transmission Electron ◽  
Physical And Chemical ◽  
Scanning Electron

This presentation will summarize fourteen years of research on the physical and chemical nature of particulates suspended in the earths atmosphere utilizing scanning electron microscopy and, to a lesser extent, transmission electron microscopy. Topics to be discussed include (1) the rationale for using electron microscopy to study airborne particulates, (2) methods for collecting airborne particulates, (3) methods of analysis and (4) a summary of results. Examples will demonstrate how conclusions about the nature and source of collected particles can differ between bulk sample analyses and discrete particle analyses. Without the input from discrete particle analyses, bulk analytical techniques may produce serious errors in the apportionment of airborne particulates to specific sources.The scanning electron microscope (SEM) and transmission electron microscopy (TEM) have proven themselves to be the preferred instruments to use in the study of discrete fine particles because they permit sufficient resolution and analytical capabilities to examine the structure and chemistry of individual particles less than a few micrometers in diameter.

Synthesis of Silver Nanoparticles by Sonochemical Induced Reduction Application in SERS

2010 ◽  
Vol 9 ◽  
pp. 77-81 ◽  
Author(s):  
Esaú Solano-Ruiz ◽  
Roberto Sato Berrú ◽  
J. Ocotlán-Flores ◽  
José M. Saniger
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Silver Nanoparticles ◽  
Silver Nitrate ◽  
Ultrasonic Irradiation ◽  
Sodium Citrate ◽  
Reducing Agent ◽  
Visible Spectroscopy ◽  
Transmission Electron

In this work, we present the synthesis of silver nanoparticles by ultrasonic irradiation of a solution containing silver nitrate as precursor and sodium citrate as reducing agent. These nanoparticles were characterized by ultraviolet-visible spectroscopy and transmission electron microscopy (TEM) and then were tested as SERS-active colloids.

scholarly journals Biocatalytic and Biological Activities of Cassia Occidentalis Mediated Silver Nanoparticles

2022 ◽  
Vol 19 (1) ◽  
pp. 1712
Author(s):  
Shashika Singh ◽  
Viresh Mohanlall
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Silver Nanoparticles ◽  
Leaf Extracts ◽  
Gram Positive ◽  
Cassia Occidentalis ◽  
Gram Negative ◽  
Transmission Electron ◽  
Scanning Electron

Silver nanoparticles (AgNPs) were synthesized using the leaf extracts from Cassia occidentalis. The reactions were marked by a distinct colour change and the formation of AgNPs was monitored by measuring the UV-Vis spectra. The morphology and crystalline phase of the metal nanoparticles were determined using Transmission Electron Microscopy (TEM) and Scanning Electron Microscopy (SEM) with Energy Dispersive X-ray analysis (EDX) and Fourier-Transform-Infrared Spectroscopy (FTIR). The biocatalytic activity of the AgNPs against nitrifying compounds was determined using 4-nitrophenol and 4-nitroalanine. The biological screening involved analyzing the AgNPs effectiveness against gram-negative and gram-positive bacteria (Escherichia coli, Staphylococcus aureus, Klebsiella pneumoniae, Pseudomonas aeruginosa, Bacillus cereus and Enterococcus faecalis). The AgNPs displayed minimal inhibition at low concentrations ranging from 25 to 50 μg/mL. The toxicity of the AgNPs was tested using the brine shrimp assay and was observed as non-toxic with a nearly zero mortality rate. The AgNPs exhibited an antioxidant potential of 70.90 % inhibition at 1000 µg/mL. C. occidentalis is noted as a potential bioresource for synthesizing AgNPs with applications as antibacterial, antioxidant and biocatalytic agents. HIGHLIGHTS The addition of Ag nanoparticles to C. occidentalis plant extracts resulted in the formation of AgNPs-C. occidentalis complexes The AgNPs-C. occidentalis complexes were characterized using Transmission Electron Microscopy, Scanning Electron Microscopy with EDX, UV-Vis spectrophotometry and IR spectroscopy These AgNPs-C. occidentalis complexes were very stable and showed antibacterial activity against a range of tested gram-positive and gram-negative bacteria at low doses, thus proving to be good antimicrobial agents The AgNPs-C. occidentalis complexes showed higher scavenging activity than leaf extracts of C. occidentalis. The AgNPs have increased catalytic ability for the reduction of 4-nitrophenol and 4-nitroalanine after a 30 min time interval GRAPHICAL ABSTRACT

scholarly journals Green Synthesis of Silver Nanoparticles Using Azadiracta indica and Gardenia gummifera Plant Extract

2021 ◽  
pp. 491-498
Author(s):  
Anurag Verma ◽  
Piyush Mittal ◽  
Milind S. Pande ◽  
Neelanchal Trivedi ◽  
Bhuvnesh Kumar ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Silver Nanoparticles ◽  
Metal Nanoparticles ◽  
Medical Science ◽  
Chemical Properties ◽  
E Coli ◽  
Transmission Electron ◽  
Long Time ◽  
Mixed Nanoparticles ◽  
Physical And Chemical

In material science, nanotechnology is considered as most common active area of research. Nanotechnology deals with the nanoparticles having a size range of 1-100nm used in medicinal chemistry, atomic physics. Nowadays, the use of metal nanoparticles in areas such molecular diagnostics and drug delivery, imaging, sensing has been of great scientific interest as a result of their peculiar optoelectronic and physicochemical properties. Thus synthesis of metal nanoparticles through effective, environmental friendly and cheaper approach is very important in nanotechnology research. In the current study Silver nanoparticles (AgNPs) were incorporated utilizing Azadiracta indica and Gardenia gummifera plant separate alongside their antimicrobial action. Silver had been a subject of interest from past a very long time because of its physical and chemical properties. Further depiction of mixed nanoparticles was finished by using Scanning electron microscopy (SEM) and Transmission electron microscopy (TEM). The combined AgNPs were found with the size scope of 60-80nm. Antimicrobial movement of AgNPs was considered in contrast to S. aureus, E. coli and Pseudomonas aeruginosa. Thus the results indicate that the AgNPs may have an application in medical science.

Synthesis and Characterization of Silver Nanoparticles

2014 ◽  
Vol 802 ◽  
pp. 135-139
Author(s):  
Paula de Freitas Rosa ◽  
Samirys Sara Rodrigues Cirqueira ◽  
Mônica Lopes Aguiar ◽  
André Bernardo
Keyword(s):  
Electron Microscopy ◽  
Silver Nanoparticles ◽  
Sodium Citrate ◽  
Reduction Reaction ◽  
Synthesis And Characterization ◽  
Scanning Mobility Particle Sizer ◽  
Filtration Equipment ◽  
Transmission Electron ◽  
Particle Sizer

Nanoparticles have large surface area, which gives them more pronounced effects. Silver nanoparticles, for example, have pronounced biocidal effects, since they can inactivate certain enzymes and alter the DNA synthesis of some microorganisms. In this context, the study of the synthesis and characterization of nanoparticles becomes potentially important. The aim of this work was to synthesize nanoparticles and to characterize them in order to contribute to the development of synthesis and characterization of nanomaterials. Several methods are used for the synthesis of silver nanoparticles; however, in this study we used the Turchevich method which makes use of a reduction reaction using sodium citrate as the reducing agent, and silver nitrate as starting material. After being synthesized, nanoparticles were analyzed with the technique of transmission electron microscopy (TEM). Also, a curve of the size distribution of the particles formed was obtained. This distribution was obtained through a nanoparticle filtration equipment connected to a particle counter-SMPS (Scanning Mobility Particle Sizer).

AN OVERVIEW OF SILVER NANOPARTICLES

2021 ◽  
Vol 12 (4) ◽  
pp. 170-175
Author(s):  
M Mohan Varma ◽  
Indukuri Kinnera
Keyword(s):  
Electron Microscopy ◽  
Silver Nanoparticles ◽  
Photoelectron Spectroscopy ◽  
Localized Surface Plasmon ◽  
Nano Materials ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Biological Technique ◽  
Physical And Chemical

During the past few years, silver nanoparticles became one amongst the foremost investigated and explored technology derived nanostructures, given the fact that nano silver primarily based materials established to possess attention-grabbing, challenging, and inspiring characteristics appropriate for numerous applications. Generation after generation, the postulates come back forth regarding properties of silver for the traditional Greeks cook from silver pots and the recent saying “born with silver spoon in his mouth” so show that ingestion with a silver spoon was renowned as uncontaminated. Silver has an excessive amount of contemporary industrial uses and is considered as a store of wealth. Silver nanoparticles are unit one amongst the foremost very important and interesting nano materials among many metals like nanoparticles. they need been urban as a complicated unit within the field of nanotechnology. This review predominately focused on advantages and synthesis of silver nanoparticles using physical, chemical, and biological ways. However, physical, and chemical methods are harmful and expensive however the biological technique is easy, rapid, non- noxious and ecofriendly. It additionally explains regarding mechanism of action, numerous characterization techniques as well as UV- Visible Spectroscopy, Localized Surface Plasmon Resonance (LSPR), X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), Fourier Transform Infrared (FTIR) spectroscopy, X- ray Photoelectron Spectroscopy (XPS), Dynamic Light Scattering (DLS), Zeta Potential and finally concluded with numerous applications.

Fabrication of Nanoparticles and Microspheres with Uniform Magnetic Half-Shells

2005 ◽  
Vol 899 ◽  
Author(s):  
Brandon H. McNaughton ◽  
Vladimir A. Stoica ◽  
Jeffrey N. Anker ◽  
Katherine M. Tyner ◽  
Roy Clarke ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Vapor Deposition ◽  
Nano Particles ◽  
Silica Nanospheres ◽  
Uniform Size ◽  
Transmission Electron ◽  
Chemical Measurements ◽  
Polystyrene Nanospheres ◽  
Physical And Chemical ◽  
Scanning Electron

AbstractWe report a method for fabricating, anisotropically designed, multiphasic nano-particles with uniform magnetic half-shells. Cobalt layers were deposited onto commercially made non-magnetic polystyrene nanospheres and microspheres, using ultrahigh vacuum vapor deposition, which produced particles with a half-shell of uniform size, shape and magnetic content. Iron was also deposited onto commercially made silica nanospheres and microspheres and was characterized using transmission electron microscopy and scanning electron microscopy. The coercivity of the magnetic material layers, on the substrate-supported spheres, was enhanced compared to the bulk values of such films without spheres. The particles, once removed from the substrate, were amenable to being rotated in solution, which could allow for more accurate physical and chemical measurements in a variety of fluidic environments. Applications for imaging local mechanical, magnetic and electrical environments are also delineated.

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