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.

scholarly journals Effect of Carboxylic Functional Group Functionalized on Carbon Nanotubes Surface on the Removal of Lead from Water

2010 ◽  
Vol 2010 ◽  
pp. 1-9 ◽  
Author(s):  
Muataz Ali Atieh ◽  
Omer Yehya Bakather ◽  
Bassam Al-Tawbini ◽  
Alaadin A. Bukhari ◽  
Faraj Ahmad Abuilaiwi ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Functional Group ◽  
Multiwall Carbon Nanotubes ◽  
Chemical Properties ◽  
Average Diameter ◽  
Transmission Electron ◽  
Physical And Chemical ◽  
Multiwall Carbon ◽  
Carboxylic Functional Group

The adsorption mechanism of the removal of lead from water by using carboxylic functional group (COOH) functionalized on the surface of carbon nanotubes was investigated. Four independent variables including pH, CNTs dosage, contact time, and agitation speed were carried out to determine the influence of these parameters on the adsorption capacity of the lead from water. The morphology of the synthesized multiwall carbon nanotubes (MWCNTs) was characterized by using field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) in order to measure the diameter and the length of the CNTs. The diameters of the carbon nanotubes were varied from 20 to 40 nm with average diameter at 24 nm and 10 micrometer in length. Results of the study showed that 100% of lead was removed by using COOH-MCNTs at pH 7, 150 rpm, and 2 hours. These high removal efficiencies were likely attributed to the strong affinity of lead to the physical and chemical properties of the CNTs. The adsorption isotherms plots were well fitted with experimental data.

scholarly journals One-step synthesis of gold and silver non-spherical nanoparticles mediated by Eosin Methylene Blue agar

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Diego Alberto Lomelí-Rosales ◽  
Adalberto Zamudio-Ojeda ◽  
Sara Angélica Cortes-Llamas ◽  
Gilberto Velázquez-Juárez
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Methylene Blue ◽  
Silver Nanoparticles ◽  
Metal Nanoparticles ◽  
Reduction Process ◽  
Gold And Silver Nanoparticles ◽  
Transmission Electron ◽  
One Step ◽  
Conventional Plate

AbstractNowadays, there are several approaches reported to accomplish the green synthesis of metal nanoparticles by using bacterial and fungi supernatants or by-products generated by these microorganisms. Therefore, agars as solely reductive regents have started to be used in order to obtain metal nanoparticles. This paper shows the results of the synthesis of gold and silver nanoparticles with different morphology, mainly triangular and truncated triangular, using Eosin Methylene Blue (EMB) agar as reducing agent. To control the reaction process, the necessary activation energy for the reducer was provided by three different techniques: microwave radiation, using a domestic microwave oven, ultraviolet radiation, and heating on a conventional plate. The evolution of the reduction process and stability of the samples was performed by ultraviolet visible spectroscopy. Morphology was carefully analyzed using high-resolution transmission electron microscopy (HRTEM) and Transmission electron microscopy (TEM). A one step synthesis for gold and silver nanoparticles was optimized with an eco-friendly and economic process.

A unique pathway of PtNi nanoparticle formation observed with liquid cell transmission electron microscopy

Nanoscale ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 1414-1418
Author(s):  
Liyun Zheng ◽  
Lixin Zhao ◽  
Songhao Zhao ◽  
Xiaowei Zhang ◽  
Karen C. Bustillo ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Chemical Properties ◽  
Controlled Synthesis ◽  
Physical And Chemical Properties ◽  
Nanoparticle Growth ◽  
Transmission Electron ◽  
Liquid Cell ◽  
Physical And Chemical ◽  
Synthesis Of Nanomaterials ◽  
And Chemical Properties

An understanding of nanoparticle growth is significant for controlled synthesis of nanomaterials with desired physical and chemical properties.

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.

Mineralogy of volcanically derived alluvial soils at Moshi, Tanzania

Soil Research ◽  
2016 ◽  
Vol 54 (8) ◽  
pp. 926
Author(s):  
T. S. Taylor ◽  
J. C. Hughes ◽  
L. W. Titshall
Keyword(s):  
Electron Microscopy ◽  
Clay Fraction ◽  
Chemical Properties ◽  
Volcanic Glass ◽  
X Ray Diffraction ◽  
Surface Areas ◽  
Transmission Electron ◽  
Physical And Chemical ◽  
Extractable Iron ◽  
And Chemical Properties

Despite intensive commercial agriculture in the rift zone of Tanzania, mineralogical studies on the soils influenced by volcanic parent materials are scarce. A mineralogical investigation of the soils and two buried ash layers from an irrigated sugar estate was undertaken using X-ray diffraction, transmission electron microscopy and measurements of extractable iron, aluminium and silicon and the specific surface area (SSA) of the clay fraction. The dominant mineral in the sand and silt fractions was sanidine. The clay fractions contained mainly high-defect kaolin, illite and K-feldspar, with small amounts of calcite, talc and gibbsite in some samples. Electron microscopy revealed the presence of tubular and spheroidal halloysite and <0.5µm kaolinite crystals, as well as nanocrystalline material, probably allophane, and volcanic glass. The amounts of ferrihydrite (0.34–1.84%) and allophane (0.52–6.84%) were low in the soils but higher in the buried ash layers. The surface areas of the clay fractions were high (up to 145m2g–1) and it was calculated that 5% allophane constituted 22% of the total SSA. Although all soils were dominated by halloysite and small kaolinite particles, it is likely that the small amounts of allophane with high SSA has a strong effect on their physical and chemical properties.

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.

scholarly journals Silver nanoparticles nucleated in NaOH-treated halloysite: a potential antimicrobial material

2021 ◽  
Vol 12 ◽  
pp. 798-807
Author(s):  
Yuri B Matos ◽  
Rodrigo S Romanus ◽  
Mattheus Torquato ◽  
Edgar H de Souza ◽  
Rodrigo L Villanova ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Silver Nanoparticles ◽  
Antimicrobial Properties ◽  
X Ray Diffraction ◽  
Ag Nps ◽  
Scanning Calorimetry ◽  
Medical Treatments ◽  
X Ray ◽  
E Coli ◽  
Transmission Electron

Despite all recent advances in medical treatments, infectious diseases remain dangerous. This has led to intensive scientific research on materials with antimicrobial properties. Silver nanoparticles (Ag-NPs) are a well-established solution in this area. The present work studied the nucleation of silver on halloysite substrates modified by chemical treatment with NaOH. The resulting stabilized Ag-NPs were characterized by X-ray diffraction, transmission electron microscopy, and energy-dispersive X-ray spectroscopy. The nucleation was characterized by thermogravimetric analysis and differential scanning calorimetry. The antimicrobial properties of the Ag-NPs were investigated against E. coli and S. aureus. The potential of the Ag-NPs for industrial application was tested by dispersing them into low-density polyethylene. The importance of the chemical affinity between matrix and additive was tested through coating the Ag-NPs with dodecanethiol, a non-polar surfactant. The resulting composites were characterized by scanning electron microscopy and in terms of surface antimicrobial activity. The results demonstrate that the Ag-NPs synthesized in this work are indeed antimicrobial, and that it is possible to imbue a polymeric matrix with the antimicrobial properties of Ag-NPs.

scholarly journals Silver nanoparticles nucleated in NaOH treated halloysite: a potential antimicrobial material.

2021 ◽  
Author(s):  
Yuri B Matos ◽  
Rodrigo S Romanus ◽  
Mattheus Torquato ◽  
Edgar H de Souza ◽  
Rodrigo L Villanova ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Silver Nanoparticles ◽  
Antimicrobial Properties ◽  
X Ray Diffraction ◽  
Ag Nps ◽  
Scanning Calorimetry ◽  
Medical Treatments ◽  
X Ray ◽  
E Coli ◽  
Transmission Electron

Despite all recent advances in medical treatments, infectious diseases remain dangerous. This scenario has led to intense scientific research on materials with antimicrobial properties. Silver nanoparticles (Ag-NPs) are a well established solution in this area. The present work studied the nucleation of silver in halloysite substrates (HNT) modified by a NaOH chemical treatment. The resulting stabilized Ag-NPs were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and energy dispersive x-ray spectroscopy (EDS). The nucleation was characterized by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). Ag-NPs antimicrobial properties were investigated against \textit{E. coli} and \textit{S. aureus}. The potential of Ag-NPs for industrial application was tested by dispersing them into low density polyethylene (LDPE). The importance of the chemical affinity between matrix and additive was tested coating Ag-NPs with dodecanethiol, a non-polar surfactant. The resulting composites were characterized by scanning electron microscopy (SEM) and in terms of surface antimicrobial activity. The results demonstrate that Ag-NPs synthesized in this work are indeed antimicrobial, and that it is possible to imbue a polymeric matrix with the Ag-NPs antimicrobial properties.

An Ultrastructural Study of Chronic Pyelonephritis in Macaca Arctoides

1976 ◽  
Vol 34 ◽  
pp. 310-311
Author(s):  
T.W. Smith ◽  
J.A. Roberts ◽  
B.J. Martin
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Ultrastructural Study ◽  
Effective Means ◽  
Chronic Pyelonephritis ◽  
Macaca Arctoides ◽  
Left Ureter ◽  
E Coli ◽  
Transmission Electron ◽  
Sizeable Number

Chronic pyelonephritis is one of the most common diseases of the kidney and accounts for a sizeable number of cases of renal insufficiency in man, however its pathogenesis requires further elucidation. Transmission electron microscopy may serve as a uniquely effective means of observing details of the nature of this disease. The present paper describes preliminary results of an ultrastructural study of chronic pyelonephritis in Macaca arctoides (stumptail monkey).The infection was induced in these experiments in a retrograde fashion by means of a unilateral catheterization of the left ureter whereby an innoculum of 10 cc of broth containing approximately 2 billion E. coli per cc and radio-opaque dye were injected under pressure (mimicing vesico-ureteric reflux).

Imaging sub-micron objects with light microscopy: Visualization of the T-4 bacteriophage

1989 ◽  
Vol 47 ◽  
pp. 834-835
Author(s):  
Malcolm Brown ◽  
Reynolds M. Delgado ◽  
Michael J. Fink
Keyword(s):  
Electron Microscopy ◽  
Light Microscopy ◽  
Focal Plane ◽  
Phase Contrast ◽  
Dark Field ◽  
E Coli ◽  
Polystyrene Beads ◽  
Television Camera ◽  
Transmission Electron ◽  
Universal Microscope

While light microscopy has been used to image sub-micron objects, numerous problems with diffraction-limitations often preclude extraction of useful information. Using conventional dark-field and phase contrast light microscopy coupled with image processing, we have studied the following objects: (a) polystyrene beads (88nm, 264nm, and 557mn); (b) frustules of the diatom, Pleurosigma angulatum, and the T-4 bacteriophage attached to its host, E. coli or free in the medium. Equivalent images of the same areas of polystyrene beads and T-4 bacteriophages were produced using transmission electron microscopy.For light microscopy, we used a Zeiss universal microscope. For phase contrast observations a 100X Neofluar objective (N.A.=1.3) was applied. With dark-field, a 100X planachromat objective (N.A.=1.25) in combination with an ultra-condenser (N.A.=1.25) was employed. An intermediate magnifier (Optivar) was available to conveniently give magnification settings of 1.25, 1.6, and 2.0. The image was projected onto the back focal plane of a film or television camera with a Carl Zeiss Jena 18X Compens ocular.

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