scholarly journals Green Synthesis, Characterization and Antibacterial Study of Ag-Au Bimetallic Nanocomposite using Tea Powder Extract

2020 ◽  
Vol 11 (1) ◽  
pp. 8087-8095
Keyword(s):  
Green Synthesis ◽  
Biological Behavior ◽  
X Ray Diffraction ◽  
Antibacterial Study ◽  
X Ray ◽  
Synthesis Of Nanoparticles ◽  
Transmission Electron ◽  
Silver Sample ◽  
Bimetallic Nanocomposite ◽  
Tea Extract

Synthesis of metal nanoparticles using plant extracts is attracted much to the recent researchers due to its simplicity, which integrates chemical technology. Special attention is given to the green synthesis of nanoparticles by easily available plants with an eco-friendly system compared to other conventional methods. Silver-Gold nanocomposite (Ag-Au NCp’s) is synthesized by bi reduction of silver nitrate and gold chloride. These metal salts are simultaneously reduced by tea extract to form respective silver and gold nanocomposite. The structure and morphology of as-prepared Ag-Au NCp’s sample were characterized by employing powder X-ray diffraction (XRD) tool and by Scanning Electron Micrograph (SEM) tool, respectively. Fourier Transform Infrared (FTIR) spectral study was undertaken to know the bonding in the prepared silver sample. Morphology and particle size of the above composite was studied by the Transmission electron microscope (TEM) tool. Energy-dispersive X-ray analysis (EDX) study was undertaken to know the formation of Ag-Au NCp’s. Antibacterial activity study is undertaken to know its biological behavior.

Optimization of Green Synthesis Approach of Silver Nanoparticles Using Indonesian Wild Honey

2021 ◽  
Vol 891 ◽  
pp. 111-115
Author(s):  
Maradhana Agung Marsudi ◽  
Farah Fitria Sari ◽  
Pandu Mauliddin Wicaksono ◽  
Adinda Asmoro ◽  
Arif Basuki ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Silver Nanoparticles ◽  
Green Synthesis ◽  
Synthesis Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Particle Count ◽  
Transmission Electron ◽  
Nitrate Precursor ◽  
Synthesis Approach

In this work, silver nanoparticles have been successfully synthesized using simple and environmentally friendly ‘green synthesis’ method using Indonesian wild honey as mediator. Particle count and size can be optimized by varying the silver nitrate precursor and honey concentration, with the help of sodium hydroxide as pH regulator. Based on X-ray diffraction (XRD) result, crystalline structure of Ag has been confirmed in sample with impurities from AgCl. Based on dynamic light scattering (DLS) and transmission electron microscopy (TEM) results, it was found that the smallest average particles size of AgNPs (117.5 nm from DLS and 11.1 nm from TEM) was obtained at sample with 5% w/v of honey and 0.5 mM of AgNO3.

scholarly journals Anticoagulant, thrombolytic and antibacterial activities of Euphorbia acruensis latex-mediated bioengineered silver nanoparticles

2019 ◽  
Vol 8 (1) ◽  
pp. 590-599 ◽  
Author(s):  
Kaushik Roy ◽  
Ambikesh K. Srivastwa ◽  
Chandan K. Ghosh
Keyword(s):  
Silver Nanoparticles ◽  
Analytical Techniques ◽  
Antibacterial Activities ◽  
Diffusion Method ◽  
X Ray Diffraction ◽  
Antibacterial Study ◽  
X Ray ◽  
Transmission Electron ◽  
Human Blood Samples ◽  
Green Synthesized Silver Nanoparticles

Abstract In this report, we present a simple and unexplored procedure for green synthesis of silver nanoparticles featuring exudation of Euphorbia acruensis along with the study of its antibacterial and anticoagulant properties. Analytical techniques like ultraviolet visible spectroscopy (UV-Vis), X-ray diffraction (XRD) and high resolution transmission electron microscopy (HRTEM) were used to analyse the production, crystallinity and morphology of bio-reduced silver nanoparticles. The antibacterial study was performed by following standard disc diffusion method. Most importantly, the anticoagulant and thrombolytic activities of biogenic silver nanoparticles were evaluated by addition of nanoparticles to human blood samples under practical conditions. These green synthesized silver nanoparticles were found to have potent antibacterial, anticoagulant and thrombolytic properties which make them an attractive choice for future medical applications.

scholarly journals Green synthesis and characterization of cuprous oxide nanoparticles in presence of a bio-surfactant

2014 ◽  
Vol 32 (4) ◽  
pp. 702-708 ◽  
Author(s):  
M. Behera ◽  
G. Giri
Keyword(s):  
Green Synthesis ◽  
Photoelectron Spectroscopy ◽  
Broad Band ◽  
X Ray Diffraction ◽  
Oh Groups ◽  
X Ray ◽  
Transmission Electron ◽  
Fcc Lattice ◽  
Perennial Shrub ◽  
A Charge

AbstractHerein, we report a facile green synthesis of Cu2O nanoparticles (NPs) using copper sulfate as precursor salt and hydrazine hydrate as reducing agent in presence of bio-surfactant (i.e. leaves extract of arka — a perennial shrub) at 60 to 70 °C in an aqueous medium. A broad band centered at 460 nm in absorption spectrum reveals the formation of surfactant stabilized Cu2O NPs. X-ray diffraction pattern of the surfactant stabilized NPs suggests the formation of only Cu2O phase in assistance of a bio-surfactant with the crystallite size of ∼8 nm. A negative zeta potential of −12 mV at 8.0 pH in surfactant stabilized Cu2O NPs hints non-bonding electron transfer from O-atom of saponin to the surface of NP. Red-shift in the vibrational band (Cu-O stretching) of Cu2O from 637 cm−1 to 640 cm−1 in presence of bio-surfactant suggests an interfacial interaction between NPs and O-atoms of -OH groups of saponin present in the plant (i.e. Calotropis gigantean) extract. From X-ray photoelectron spectroscopy spectra, a decrease in binding energy of both 2p3/2 and 2p1/2 bands in Cu2O with saponin molecules as compared to bulk Cu atom reveals a charge transfer interaction between NP and saponin surfactant molecules. Transmission electron microscopy images show crystalline nature of Cu2O NPs with an fcc lattice.

Chemical synthesis of nanoparticles for artificial pinning centers in YBCO coated conductors

2005 ◽  
Vol 868 ◽  
Author(s):  
Srivatsan Sathyamurthy ◽  
Keith J. Leonard ◽  
M. Parans Paranthaman
Keyword(s):  
Coated Conductors ◽  
Ceria Nanoparticles ◽  
Structure And Properties ◽  
X Ray Diffraction ◽  
Pinning Centers ◽  
X Ray ◽  
Synthesis Of Nanoparticles ◽  
Artificial Pinning Centers ◽  
Transmission Electron ◽  
Ybco Coated Conductors

AbstractCeria nanoparticles were prepared using a solution based approach using cerium (III) acetate as a starting material and cetyltrimethylammonium hydroxide (CTAOH) as a precipitating agent and surfactant. The presence of the surfactant CTAOH helps prevent agglomeration of the nanoparticles. Using X-ray diffraction (XRD) and high resolution transmission electron microscopy (HRTEM), the particle size was determined to be 3.5 – 4 nm. The structure and properties of these CeO2 nanoparticles have been analyzed.

scholarly journals Cottonseed Oilcake Extract Mediated Green Synthesis of Silver Nanoparticles and Its Antibacterial and Cytotoxic Activity

2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
Muthusamy Govarthanan ◽  
Min Cho ◽  
Jung-Hee Park ◽  
Jum-Suk Jang ◽  
Young-Joo Yi ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Silver Nanoparticles ◽  
Fourier Transform ◽  
Green Synthesis ◽  
Pseudomonas Syringae ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Xrd Techniques

Agroindustrial byproduct mediated green synthesis of silver nanoparticles was carried out using cottonseed oilcake (CSOC) extract. The aqueous silver nitrate formed stable silver nanoparticles with CSOC extract as a reducing agent for Ag+to Ag0. The synthesized nanoparticles were characterized using energy dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM), Fourier transform infrared (FTIR) spectroscopy, and X-ray diffraction (XRD) techniques. The synthesized silver nanoparticles (AgNPs) (4 mM) significantly inhibited the growth of phytopathogens,Pseudomonas syringaepv.actinidiaeandRalstonia solanacearum. Further, cytotoxicity of AgNPs was evaluated using rat splenocyte cells. The splenocyte viability was decreased according to the increasing concentration of AgNPs and 90% of cell death was observed at 100 μg/mL.

scholarly journals Green synthesis of Ag/TiO2 Nanocomposite Assisted by Gambier Leaf (Uncaria gambir Roxb) Extract

2019 ◽  
Vol 22 (6) ◽  
pp. 250-255 ◽  
Author(s):  
Sry Wahyuni ◽  
Syukri Syukri ◽  
Syukri Arief
Keyword(s):  
Silver Nanoparticles ◽  
Green Synthesis ◽  
Diffuse Reflectance Spectroscopy ◽  
Irradiation Time ◽  
Rutile Phase ◽  
X Ray Diffraction ◽  
Silver Surface ◽  
X Ray ◽  
Synthesis Of Nanoparticles ◽  
Vis Spectroscopy

Studies of green synthesis of nanoparticles mediated by plants extract is extensively explored and studied in recent time due to eco-friendliness, cost-effectiveness, and use a minimum amount of toxic chemicals in the process of inorganic material synthesis. In this study, the immobilization of silver nanoparticles on the surface of titanium dioxide (TiO2) was carried out using Uncaria gambier Roxb. leaf extract as a silver ion (Ag+) reducing agent. The synthesized Ag/TiO2 nanocomposite was characterized by UV-Vis spectroscopy, X-ray diffraction (XRD), and Diffuse Reflectance Spectroscopy (DRS). The formation of silver nanoparticles was confirmed through UV-Vis spectroscopic analysis, which showed a silver surface plasmon resonance (SPR) band at 426 nm. The X-ray diffraction pattern shows that Ag can inhibit the transition of the anatase into rutile phase. The presence of Ag particles in TiO2 can increase the absorption ability from an initial wavelength of 407 nm to 438 nm. Based on the results of Rhodamin B degradation, it can be seen that Ag/TiO2 has a higher photocatalytic activity than bare TiO2 with 99% percent degradation at 120 minutes of irradiation time.

scholarly journals Anticancer Activity of Silver Nanoparticle by Using Cassia auriculata Extract

2020 ◽  
pp. 1-9
Author(s):  
M. Prem Nawaz ◽  
A. Afroos Banu ◽  
S. Raja Mohamed ◽  
M. Palanivelu ◽  
A. Ayeshamariam
Keyword(s):  
Green Synthesis ◽  
Synthesis Method ◽  
Precursor Solution ◽  
Cotton Fabrics ◽  
X Ray Diffraction ◽  
Ag Nps ◽  
X Ray ◽  
Cassia Auriculata ◽  
Transmission Electron ◽  
Mcf 7

In this study, green synthesis of silver nanoparticles (Ag NPs) has done using traditional herbal namely Cassia auriculata extract by the simple Green synthesis method. The synthesized Ag nanoparticles were studied by the characterization techniques includes X-ray diffraction (XRD) crystallography for nature of crystalline with relevant parameters, Transmission electron microscopy (TEM) for particle size as well as the SAED patterns for amorphous, crystalline or polynanocrystalline and Photoluminescence analysis were carried out for the prepared NPs. Ag NPs were fabricated utilizing Phyto-aquatic extract of Cassia auriculata which act as a reducing agent, and it was converted into a precursor solution to coat on cotton fabrics for antibacterial applications. To further, its performance on anticancer application was studied for Michigan Cancer Foundation-7 (MCF-7) line breast cancer.

scholarly journals Influence of the Alcoholic/Ethanolic Extract of Mangifera indica Residues on the Green Synthesis of FeO Nanoparticles and Their Application for the Remediation of Agricultural Soils

Molecules ◽  
2021 ◽  
Vol 26 (24) ◽  
pp. 7633
Author(s):  
Jhordi Bautista-Guzman ◽  
Rosa Gomez-Morales ◽  
David Asmat-Campos ◽  
Noemi Raquel Checca
Keyword(s):  
Green Synthesis ◽  
Agricultural Soils ◽  
Mangifera Indica ◽  
Physical Property Measurement System ◽  
Physical Property ◽  
Ethanolic Extract ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Potential Alternative

The green synthesis of iron oxide nanoparticles (FeO NP) has been investigated using the extract in absolute ethanolic and alcoholic solvents 96% from the peel of the mango fruit (Mangifera indica), thus evaluating the influence of the type of solvent on the extraction of reducing metabolites. A broad approach to characterization initially controlled by UV-vis spectrophotometry has been directed, the formation mechanism was evaluated by Fourier transform infrared spectroscopy (FTIR), the magnetic properties by characterization by Physical Property Measurement System (PPSM), in addition to a large number of techniques such as X-ray energy dispersive spectroscopy (EDS), X-ray diffraction (DRX), transmission electron microscopy (TEM/STEM), electron energy loss spectroscopy (EELS), and Z potential to confirm the formation of FeO NP. The results suggest better characteristics for FeO NP synthesized using 96% alcoholic solvent extract. The successful synthesis was directly proven in the removal of metals (Cr-VI, Cd, and Pb) as a potential alternative in the remediation of agricultural soils.

scholarly journals Nanoengineering of Gold Nanoparticles: Green Synthesis, Characterization, and Applications

Crystals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 612 ◽  
Author(s):  
Nancy Tepale ◽  
Víctor V. A. Fernández-Escamilla ◽  
Clara Carreon-Alvarez ◽  
Valeria J. González-Coronel ◽  
Adan Luna-Flores ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Green Synthesis ◽  
Photoelectron Spectroscopy ◽  
X Ray Diffraction ◽  
Fundamental Study ◽  
X Ray ◽  
Force Microscopy ◽  
X Ray Scattering ◽  
Atomic Force ◽  
Transmission Electron

The fundamental aspects of the manufacturing of gold nanoparticles (AuNPs) are discussed in this review. In particular, attention is devoted to the development of a simple and versatile method for the preparation of these nanoparticles. Eco-friendly synthetic routes, such as wet chemistry and biosynthesis with the aid of polymers, are of particular interest. Polymers can act as reducing and/or capping agents, or as soft templates leading to hybrid nanomaterials. This methodology allows control of the synthesis and stability of nanomaterials with novel properties. Thus, this review focus on a fundamental study of AuNPs properties and different techniques to characterize them, e.g., Transmission Electron Microscopy (TEM), Atomic Force Microscopy (AFM), UV-Visible spectroscopy, Dynamic Light Scattering (DLS), X-Ray Diffraction (XRD), X-Ray Photoelectron Spectroscopy, Small-angle X-Ray Scattering (SAXS), and rheology. Recently, AuNPs obtained by “green” synthesis have been applied in catalysis, in medicine, and as antibacterials, sensors, among others.

Green Synthesis of Iron Nanoparticles by a Polysaccharide Bioflocculant from Marine Alcaligenes faecalis HCB2 and Characterization

2020 ◽  
Vol 12 (8) ◽  
pp. 1034-1039
Author(s):  
Nkosinathi G. Dlamini ◽  
Albertus K. Basson ◽  
Rajasekhar V. S. R. Pullabhotla
Keyword(s):  
Electron Microscopy ◽  
Green Synthesis ◽  
Iron Nanoparticles ◽  
Alcaligenes Faecalis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Cobalt Nickel ◽  
Transmission Electron ◽  
Ft Ir ◽  
Xrd Studies

Iron, the most ubiquitous of the transition metals and the fourth most plentiful metal in the Earth’s crust, is the structural backbone of our modern infrastructure. It is therefore ironic that as a nanoparticle, iron has been somewhat neglected in favour of its own oxides as well as other metals such as cobalt, nickel, gold, and platinum. This study reports the green synthesis of iron nanoparticles using a bioflocculant and their characterization. The as-synthesised materials were characterized using Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FT-IR), Thermogravimetric analysis (TGA) and UV-Vis absorption spectroscopy. Spherical morphology was observed for the as-synthesised iron nanoparticles (FeNPs) and elemental analysis indicated iron with 17.31%. XRD studies revealed the broader peaks at 24°, 29°, 30°, and 35° 2θ for the as-synthesised iron nanoparticles indicating the nano sized particles. FT-IR spectra showed the bands at 3154 cm-1 (bioflocculant) and 3244 cm-1 (iron nanoparticles) representing the presence of hydroxyl (–OH) and amine (–NH2) functional groups.

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