scholarly journals SINTESIS NANOPARTIKEL PERAK DENGAN METODE BIOLOGI MENGGUNAKAN EKSTRAK TANAMAN SAMBILOTO (Andrographis paniculata Ness)

2017 ◽  
Vol 18 (1) ◽  
pp. 6
Author(s):  
Septiana Ribka Purnomo ◽  
Ni Nyoman Rupiasih ◽  
Made Sumadiyasa
Keyword(s):  
Silver Nanoparticles ◽  
Lattice Parameter ◽  
Andrographis Paniculata ◽  
Surface Plasmon Resonance Peak ◽  
X Ray Diffraction ◽  
Plasmon Resonance Peak ◽  
Agno3 Solution ◽  
Transmission Electron ◽  
Diffraction Peaks

This study is report about the synthesis of silver nanoparticles (AgNP) using biological method (biosynthesis) using sambiloto plant extracts (Andrographis paniculata Ness). Plant part used is the leaves and extract process is done with demineralized water (aqua-dm). The synthesis is done at a ratio of AgNO3 solution with sambiloto extract solution is 10 µl : 10 ml. Characterization techniques that have been made include UV-Vis spectrophotometer, X-ray diffraction (XRD) and Transmission Electron Microscope (TEM). The results showed that silver nanoparticles formed has absorbance of SPR (surface plasmon resonance) peak at a wavelength of about 423 nm. XRD characterization of the structure obtained FCC (face center cubic) with a lattice parameter is 4.031 Å, diffraction peaks at 2q = 38,18o, 45,81o and 64,87o each corresponding to the (h k l) of (1 1 1), (2 0 0) and (2 2 0) respectively. TEM characterization obtained that the particle size distribution is 10 – 30 nm.

Synthesis and Characterization of Bone Cement (Hydroxyapatite Base) Calcinated at 900°C and Loading the Silver Nanoparticles on it

2012 ◽  
Vol 622-623 ◽  
pp. 893-896
Author(s):  
H.R. Ebrahimi ◽  
M. Eslami
Keyword(s):  
Silver Nanoparticles ◽  
Bone Cancer ◽  
Calcium Hydroxyapatite ◽  
Chemical Precipitation ◽  
X Ray Diffraction ◽  
Ag Nps ◽  
X Ray ◽  
Agno3 Solution ◽  
Transmission Electron

The bioceramics, calcium hydroxyapatite (HA), is a material which is biocompatible to the human body and is well suited to be used in hyperthermia applications for the treatment of bone cancer. We synthesis hydroxyapatite in modified synthetic body fluid (SBF) solutions at 37°C and pH of 7.4 using a novel chemical precipitation technique. Then after heat operation, on filtered precipitated result HA were produced. For loading the silver nanoparticles (Ag NPs) on the hydroxyapatite we use AgNO3 solution. And for reducing Ag+ ions apply sodium borohydrate solution. The formations of the silver nanoparticles on the HAP structure were confirmed by X-ray diffraction, transmission electron microscopy (TEM). TEM image show the nanostructure of silver particles, being formed on hydroxyapatite texture.

scholarly journals Star-Shaped Poly(2-ethyl-2-oxazoline) and Poly(2-isopropyl-2-oxazoline) with Central Thiacalix[4]Arene Fragments: Reduction and Stabilization of Silver Nanoparticles

Polymers ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 2006 ◽  
Author(s):  
Alexey Lezov ◽  
Alexander Gubarev ◽  
Maria Mikhailova ◽  
Alexandra Lezova ◽  
Nina Mikusheva ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Silver Nanoparticles ◽  
Resonance Peak ◽  
Time Dependent ◽  
Colloidal Solutions ◽  
X Ray Diffraction ◽  
Plasmon Resonance Peak ◽  
X Ray ◽  
Transmission Electron ◽  
Kinetics Of

The interaction of silver nitrate with star-shaped poly(2-ethyl-2-oxazoline) and poly(2-isopropyl-2-oxazoline) containing central thiacalix[4]arene cores, which proceeds under visible light in aqueous solutions at ambient temperature, was studied. It was found that this process led to the formation of stable colloidal solutions of silver nanoparticles. The kinetics of the formation of the nanoparticles was investigated by the observation of a time-dependent increase in the intensity of the plasmon resonance peak that is related to the nanoparticles and appears in the range of 400 to 700 nm. According to the data of electron and X-ray spectroscopy, scanning and transmission electron microscopy, X-ray diffraction analysis, and dynamic light scattering, the radius of the obtained silver nanoparticles is equal to 30 nm. In addition, the flow birefringence experiments showed that solutions of nanoparticles have high optical shear coefficients.

Green synthetic approach for starch capped silver nanoparticles and their antibacterial activity

2016 ◽  
Vol 88 (1-2) ◽  
pp. 61-69 ◽  
Author(s):  
Precious Nokwethemba Sibiya ◽  
Thokozani Xaba ◽  
Makwena Justice Moloto
Keyword(s):  
Silver Nanoparticles ◽  
Synthesis Method ◽  
Spherical Shape ◽  
Cubic Phase ◽  
Hydroxyl Groups ◽  
Synthetic Approach ◽  
Surface Plasmon Resonance Peak ◽  
Plasmon Resonance Peak ◽  
Transmission Electron ◽  
Average Size

AbstractIn this work silver nanoparticles (AgNPs) have been prepared from silver nitrate (AgNO3) precursor using a green synthesis method at room temperature. Starch with its abundance of hydroxyl groups and its biocompatibility was used as a capping and reducing agent. The formation of AgNPs was confirmed by absorption spectroscopy with the surface plasmon resonance peak at 400 nm. The sharp reflection at (111), (200), (220) and (311) was observed by powder X-ray diffraction (XRD), which indicated the presence of cubic phase AgNPs. Transmission electron microscopy (TEM) revealed that the average size of AgNPs were between 0.5 and 4 nm with a spherical shape under optimum conditions. The nanoparticles showed a decrease in size with an increase in precursor concentration as well as the increase in capping agent concentration. The nanoparticles also showed to be bactericidal towards the tested Gram-negative (Escherichia coli) and Gram-positive (Staphylococcus aureus) bacteria.

TEM and XRD Investigation of MnO2 Microstructure and its Influence on ESR of Ta Capacitors

2006 ◽  
Vol 514-516 ◽  
pp. 269-273
Author(s):  
Décio Dias ◽  
Rui Monteiro ◽  
Patrícia Almeida Carvalho ◽  
Alberto C. Ferro ◽  
Werner Lohwasser
Keyword(s):  
Complex Structure ◽  
Semiconductor Layer ◽  
Equivalent Series Resistance ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Equivalent Circuit Parameters ◽  
Diffraction Peaks ◽  
Diffraction Patterns

The development of solid electrolytic tantalum capacitors with MnO2 as counter electrode has been carried out in order to decrease the equivalent series resistance (ESR). Capacitor samples produced under different pyrolysis conditions have been characterized in terms of equivalent circuit parameters. The Ta/Ta2O5/MnO2 system has also been characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). X-ray powder diffraction patterns obtained were inconclusive due to the MnO2 complex structure and to the presence of highly intense tantalum peaks that shadow interesting MnO2 diffraction peaks. Electron diffraction TEM results enabled the characterization of the microstructure and furthermore revealed the complex crystalline structure that affects the electrical properties of the semiconductor layer. A relation between the calculated circuit parameters and microstructure of MnO2 is discussed.

Development of Biogenic Silver Nanoparticle Using Rosa Chinensis Flower Extract and Its Antibacterial Property

2016 ◽  
Vol 16 (4) ◽  
pp. 3969-3972 ◽  
Author(s):  
Yongde Meng ◽  
Yanjie Sun
Keyword(s):  
Silver Nanoparticles ◽  
X Ray Diffraction ◽  
X Ray ◽  
Rosa Chinensis ◽  
Flower Extract ◽  
Transmission Electron ◽  
Ft Ir ◽  
Ir Analysis ◽  
The Fourier Transform

In the present study, biosynthesis of silver nanoparticles was carried out using Rosa chinensis flower extract as reducing agent. The characterization of silver nanoparticles was done by UV-VIS spectrum. The morphology and size of silver nanoparticles were determined by transmission electron microscope (TEM) image. The crystallization of silver nanoparticles was confirmed by X-ray diffraction (XRD) measurements. The Fourier transform infrared (FT-IR) analysis was used to confirm the possible involvement in the formation and stabilization of synthesized silver nanoparticles by the extract of Rosa chinensis flower. Antibacterial activity of silver nanoparticles was studied against Gram positive Staphycoccus aureus and Gram negative Escherichia coli.

scholarly journals Characterization of Enhanced Antibacterial Effects of Silver Loaded Cerium Oxide Catalyst

2018 ◽  
Vol 34 (6) ◽  
pp. 2895-2901
Author(s):  
Gusliani Eka Putri ◽  
Syukri Arief ◽  
Novesar Jamarun ◽  
Feni Rahayu Gusti ◽  
Annisa Novita Sary
Keyword(s):  
Electron Microscopy ◽  
Silver Nanoparticles ◽  
Sol Gel ◽  
Nitrate Hexahydrate ◽  
X Ray Diffraction ◽  
Tem Analysis ◽  
X Ray ◽  
Transmission Electron ◽  
The Difference

Silver-cerium nanoparticles had been successfully synthesized using the sol-gel method by silver nitrate as a source of silver and cerium nitrate hexahydrate as a source of cerium. The synthesized silver-cerium nanoparticles had been characterized by X-ray diffraction,transmission electron microscopy, and scanning electron microscopy-energy dispersive X-ray. Based on the results of XRD and TEM analysis showed silver-cerium nanoparticles were spherical with the dominant size range of 8.9 -12.73 nm. SEM-EDX analysis showed silver nanoparticles covered by cerium nanoparticles that were known as the core-shell structure. Silver nanoparticles doped with cerium nanoparticles (CeONP) showed an increase in inhibitory with an increase a zone of inhibition after being doped with cerium nanoparticles. The disinfection effect of Ag-doped CeONP was more pronounced on Staphylococcus aureus than Escherichia coli, although the difference was not wide.

scholarly journals Characterization of γ′ Precipitates in Cast Ni-Based Superalloy and Their Behaviour at High-Homologous Temperatures Studied by TEM and in Situ XRD

Materials ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2397 ◽  
Author(s):  
Łukasz Rakoczy ◽  
Ondrej Milkovič ◽  
Bogdan Rutkowski ◽  
Rafał Cygan ◽  
Małgorzata Grudzień-Rakoczy ◽  
...  
Keyword(s):  
Volume Fraction ◽  
Matrix Material ◽  
High Volume ◽  
Lattice Parameter ◽  
X Ray Diffraction ◽  
In Situ Xrd ◽  
Transmission Electron ◽  
The Matrix

In situ X-ray diffraction and transmission electron microscopy has been used to investigate René 108 Ni-based superalloy after short-term annealing at high-homologous temperatures. Current work is focused on characterisation of γ′ precipitates, their volume fraction, evolution of the lattice parameter of γ and γ′ phases and misfit parameter of γ′ in the matrix. Material in the initial condition is characterised by a high-volume fraction (over 63%) of γ′ precipitates. Irregular distribution of alloying elements was observed. Matrix channels were strongly enriched in Cr, Co, W and Mo, whereas precipitates contain large amount of Al, Ti, Ta and Hf. Exposure to high-homologous temperatures in the range 1100–1250 °C led to the dissolution of the precipitates, which influenced the change of lattice parameter of both γ and γ′ phases. The lattice parameter of the matrix continuously grew during holding at high temperatures, which had a dominant influence on the more negative misfit coefficient.

scholarly journals Biosynthesis and Characterization of Gold and Silver Nanoparticles Using Milk Thistle (Silybum marianum) Seed Extract

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
R. Gopalakrishnan ◽  
K. Raghu
Keyword(s):  
Silver Nanoparticles ◽  
Seed Extract ◽  
Milk Thistle ◽  
X Ray Diffraction ◽  
Silybum Marianum ◽  
Gold And Silver Nanoparticles ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron ◽  
Vis Spectroscopy

Biogenic synthesis of gold and silver nanoparticles from aqueous solutions using milk thistle (Silybum marianum) seed extract as reducing and stabilizing agent has been reported. Formation and stabilization of nanoparticles were monitored using surface plasmon resonance (SPR) bands of UV-Vis spectroscopy. Morphology of gold and silver nanoparticles was investigated using X-ray diffraction, high-resolution transmission electron microscopy with selected area electron diffraction analysis, and dynamic light scattering. Fourier transform-infrared spectroscopy was employed to identify the possible biomolecules responsible for the reduction and stabilization of nanoparticles.

Synthesis and Characterization of Silver Nanoparticles Coated Titanium Dioxide Nanowires

2010 ◽  
Vol 663-665 ◽  
pp. 1175-1178
Author(s):  
Kai Zhang ◽  
Li Yu ◽  
Zhi Xin Lu ◽  
Gang Song
Keyword(s):  
Silver Nanoparticles ◽  
Titanium Dioxide ◽  
Synthesis Method ◽  
X Ray Diffraction ◽  
Tio2 Nanowires ◽  
X Ray ◽  
Replacement Method ◽  
Transmission Electron ◽  
And Control

For the sake of investigating the special optical character of heteronanostructures, we grow TiO2 nanowires following a three step synthesis method and coat silver nanoparticles on these nanowires with replacement method. Firstly, by adjusting the experiment parameters, we get the single crystalline titanium dioxide nanowires and control their length and diameter successfully. Secondly, we use the replacement method to make the silver nanoparticles coated on these nanowires. Finally, we use transmission electron microscopy and X-ray diffraction to characterize these productions and the results show that the silver nanoparticles are coated on the titanium dioxide nanowires uniformly and the components of these nanowires are only sliver and titanium dioxide. These new optical heteronanostructures are widely investigated all over the world and we sure that they can make great influences to the development of nanophotonics.

scholarly journals Síntesis de nanopartículas de plata reducidas con desecho producido por el insecto Ulomoides dermestoides

2019 ◽  
pp. 29-36
Author(s):  
Isabel Ramos-Villa ◽  
Diego Alberto Lomelí-Rosales ◽  
Sandra Fabiola Velasco-Ramírez ◽  
Gilberto Velazquez-Juarez
Keyword(s):  
Electron Microscopy ◽  
Amino Acids ◽  
Silver Nanoparticles ◽  
Colloidal Solution ◽  
Surface Plasmon Resonance Peak ◽  
Plasmon Resonance Peak ◽  
Transmission Electron ◽  
The Family ◽  
Darkling Beetles ◽  
Shape Of Nanoparticles

The scale of nanotechnology goes from 0.2 nm to approximately 100 nm and is used in many different disciplines. U.dermestoides is a beetle belonging to the family Tenebrionidae,commonly known as darkling beetles, it has phytophagous habits. In its waste have been identified the following organic compounds: Saponins, coumarins, steroids, phenols, alkaloids, proteins and amino acids. The synthesis of silver nanoparticles was done using colloidal solution from the reduction of silver nitrate at different concentrations, using U. dermestoides waste from three different diets: Rye and Apple; oats, bread and Apple and finally bread and Apple. Series of qualitative tests were done to determinate the presence of phenols, alkaloids carbohydrates, proteins and amino acids. UV-vis spectrophotometry was used in a range from 200 to 800 nm. The results show that between 400-450 nm there is a surface plasmon resonance peak, indicating the formation of silver nanoparticles. By scanning electron microscopy (SEM) the presence of spherical silver nanoparticles was observed and by transmission electron microscopy (TEM) was confirmed the presence and shape of nanoparticles.

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