Preparation of Colloidal Silver Nanoparticles by Laser Ablation; Evaluation and Study on its Developed Applications

2012 ◽  
Vol 488-489 ◽  
pp. 1409-1413
Author(s):  
Adeleh Granmayeh Rad ◽  
Hamed Abbasi
Keyword(s):  
Silver Nanoparticles ◽  
Laser Ablation ◽  
Colloidal Silver ◽  
Laser Ablation Method ◽  
Colloidal Silver Nanoparticles ◽  
Novel Approach ◽  
Transmission Electron ◽  
Good Potential ◽  
Average Size ◽  
20 Nm

In this work we report the preparation of colloidal silver nanoparticles. In order to prepare the silver nanoparticles laser ablation method has been used.A silver coin as a target (purity 99.9 %) was ablated by a Q-Switched Nd:YAG laser with a fluence of about 91 mJ/cm2 at a repetition rate of 10 Hz at room temperature. In order to evaluate these particles transmission electron microscopy (TEM) and spectrophotometry (from UV to NIR) have been used. The average size of prepared nanoparticles is ~ 20 nm. The importance of morphology of nanoparticles has been investigated. Developed applications of silver nanoparticles have been studied,silver nanoparticles are considered as biocompatible and low in toxicity and have good potential for biological applications. Lately silver nanoparticles have found a novel approach in different fields of medicine, biology and industry.

QUENCHING OF SURFACE PLASMON MODES IN COLLOIDAL SILVER NANOPARTICLES ON OZONIZATION

NANO ◽  
2006 ◽  
Vol 01 (03) ◽  
pp. 229-234
Author(s):  
R. K. RAKSHIT ◽  
SAYANTANI BHATTACHARYA ◽  
R. C. BUDHANI
Keyword(s):  
Silver Nanoparticles ◽  
Laser Ablation ◽  
Surface Plasmon ◽  
Effective Medium Theory ◽  
Plasmon Mode ◽  
Colloidal Silver ◽  
Medium Theory ◽  
Bright Yellow ◽  
Plasmon Peak ◽  
Colloidal Silver Nanoparticles

Oxidation characteristics of colloidal silver nanoparticles produced by pulsed laser ablation in pure and chemically treated water are studied as a function of the degree of ozonization. The bright yellow colloidal solution of silver characterized by a sharp surface plasmon mode at ~400 nm, becomes colorless in the initial stages of O 3 flow, and then acquires a brown hue with a broad plasmon peak centered at ~440 to ~450 nm on further ozonization. The solution again becomes colorless in a few days once the O 3 flow is stopped. We present a qualitative model for the reaction dynamics and analyze the optical absorption in the framework of an effective medium theory. The aqueous phase laser ablation chemistry described here provides a unique means to produce ionic silver for enhanced antimicrobial effects.

scholarly journals Optical and Photoacoustic Properties of Colloidal Silver Nanoparticles Solutions

2018 ◽  
Vol 7 (4) ◽  
pp. 1 ◽  
Author(s):  
F. Aldosari ◽  
A. M. Azzeer ◽  
A. M. Hassib
Keyword(s):  
Silver Nanoparticles ◽  
Temperature Stability ◽  
Colloidal Silver ◽  
Colloidal Solutions ◽  
X Ray Diffraction ◽  
Duration Time ◽  
Colloidal Silver Nanoparticles ◽  
Transmission Electron ◽  
Time Period ◽  
The Times

The study has aimed to investigate optical and photoacoustic properties of some colloidal silver nanoparticles at different concentration over the time. The phase purity with crystal structure of silver nanoparticles were studied using X-ray diffraction (XRD) and was confirmed by Transmission Electron Microscopy (TEM). Optical property was changed during the variable concentration of nanoparticles and duration time of sample. The absorbance of silver colloidal solutions is increased, when concentration increases but decreased with respective to the longer period of sample. Absorption peaks and stability of particles in solutions is influenced by the duration time of solution and its concentration. The low concentration-based solutions fall in the absorbance over the times. The observed PA signal is subjected by the factor of parameters; such as, pump wavelengths, energy, repetition rate, concentrations, and temperature. Stability of fluorescence and absorption peaks are influenced by the concentration of particles and time period of colloidal solution. Effects on PA signal with fluorescent and absorption peaks upon the concentration was also significant.

scholarly journals Effect of the magnetic field on the synthesis of colloidal silver and gold nanoparticles by laser ablation in bidestilated water

MOMENTO ◽  
2021 ◽  
pp. 1-11
Author(s):  
Miguel A. Valverde-Alva ◽  
Jhenry F. Agreda-Delgado ◽  
Juan A. Vega-González ◽  
Juan C. Rodríguez-Soto ◽  
Julio C. Idrogo-Córdova ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Gold Nanoparticles ◽  
Silver Nanoparticles ◽  
Laser Ablation ◽  
Zeta Potential ◽  
Inductively Coupled Plasma ◽  
Colloidal Silver ◽  
Colloidal Silver Nanoparticles ◽  
Percent Increase ◽  
The Magnetic Field

The effect of magnetic field of 0.3 T on the concentration, distribution of sizes in suspension and zeta potential of colloidal gold and colloidal silver nanoparticles, obtained by considering the pulsed laser ablation in double distilled water was studied. The magnetic field was transverse to the direction of incidence of the laser radiation and parallel to the surface of a submerged target. An Nd: YAG laser was used (1064 nm in wavelength, 10 ns in duration, repetition rate of 10 Hz and 37 mJ of energy) to ablate targets. The colloids were characterized by inductively coupled plasma optical emission spectroscopy, ultraviolet-visible spectroscopy, dynamic light scattering and zeta potential. Concentration analysis suggested that applying magnetic field of 0.3 T during nanoparticle synthesis leads to higher concentration. Applying magnetic field led to an eleven percent increase in the concentration of the colloid with gold nanoparticles and a five percent increase in the concentration of the colloidal silver nanoparticles. The absorption spectra suggested the presence of spherical nanoparticles. When analyzing the effect of the magnetic field on the hydrodynamic size distribution of the nanoparticles and the zeta potential of the colloids, no significant changes were evidenced. The magnetic confinement of the plasma induced by laser ablation caused changes in the characteristics of the colloids.

MORPHOLOGIES OF SILVER NANOPARTICLES (Ag NPs) SYNTHESIZED BY HYDROTHERMAL AND LASER ABLATION TECHNIQUES

2020 ◽  
Vol 27 (12) ◽  
pp. 2050015
Author(s):  
REHANA SHAHID ◽  
SIDRA KHALID ◽  
SHAMAILA SHAHZADI
Keyword(s):  
Electron Microscopy ◽  
Silver Nanoparticles ◽  
Laser Ablation ◽  
Hydrothermal Process ◽  
Suitable Method ◽  
Ag Nps ◽  
Uniform Size ◽  
X Ray ◽  
Laser Ablation Method ◽  
Transmission Electron

Silver nanoparticles (Ag NPs) are prepared using two different techniques namely hydrothermal and laser ablation methods. The purpose of this study is to find a more suitable method to prepare Ag NPs through comparison that can give stable and size-controlled silver nanoparticles. Techniques used for observations are X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX). Comparison of results exhibited that hydrothermal process is a more suitable method to prepare silver nanoparticles with smaller uniform size and better yield as compared to laser ablation method. Also, at low temperature, NPs obtained using hydrothermal process provide better control on morphology, high purity and narrow size distribution.

scholarly journals Toxicity of internalized laser generated pure silver nanoparticles to the isolated rat hippocampus cells

2017 ◽  
Vol 33 (7) ◽  
pp. 555-563 ◽  
Author(s):  
Canan Kursungoz ◽  
Sadık Taşkın Taş ◽  
Mustafa F Sargon ◽  
Yıldırım Sara ◽  
Bülend Ortaç
Keyword(s):  
Silver Nanoparticles ◽  
Electron Microscope ◽  
Laser Ablation ◽  
Hippocampal Slices ◽  
Dependent Manner ◽  
Major Mechanism ◽  
Laser Ablation Method ◽  
Transmission Electron ◽  
Uv Visible ◽  
Dose Dependent

Silver nanoparticles (AgNPs) are the most commonly used nanoparticles (NPs) in medicine, industry and cosmetics. They are generally considered as biocompatible. However, contradictory reports on their biosafety render them difficult to accept as ‘safe’. In this study, we evaluated the neurotoxicity of direct AgNP treatment in rat hippocampal slices. We produced pure uncoated AgNPs by a pulsed laser ablation method. NP characterization was performed by Ultraviolet (UV) visible spectrophotometer, scanning electron microscope, transmission electron microscope (TEM) and energy-dispersive X-ray spectroscopy. Rat hippocampal slices were treated with AgNPs for an hour. AgNP exposure of hippocampal tissue resulted in a significant decrease in cell survival in a dose-dependent manner. Our TEM results showed that AgNPs were distributed in the extracellular matrix and were taken into the cytoplasm of the neurons. Moreover, we found that only larger AgNPs were taken into the neurons via phagocytosis. This study showed that the pure AgNPs produced by laser ablation are toxic to the neural tissue. We also found that neurons internalized only the large NPs by phagocytosis which seems to be the major mechanism in AgNP neurotoxicity.

scholarly journals Synthesis of Colloidal Silver Nanoparticles in Various Liquid Media Using Pulse Laser Ablation Method and Its Antibacterial Properties

2021 ◽  
Vol 21 (3) ◽  
pp. 761
Author(s):  
Syifa Avicenna ◽  
Iis Nurhasanah ◽  
Ali Khumaeni
Keyword(s):  
Silver Nanoparticles ◽  
Laser Ablation ◽  
Pulse Laser ◽  
Antibacterial Agent ◽  
Pulse Laser Ablation ◽  
Synthesis Method ◽  
Antibacterial Properties ◽  
Consumer Products ◽  
Colloidal Silver ◽  
Colloidal Silver Nanoparticles

The silver nanoparticles (AgNPs) have been applied as an antibacterial agent in consumer products, cosmetics, and food industries. In this present work, AgNPs were synthesized in various mediums of polyvinylpyrrolidone (PVP), polyethylene glycol (PEG), and chitosan using the pulse laser ablation synthesis method. Experimentally, a pulse Nd:YAG laser beam (1064 nm, 7 ns, 30 mJ) was directed using a silver mirror and focused using a quartz lens with a focal length of 30 mm on a silver metal plate placed in a petri dish containing liquid mediums for 120 min to produce colloidal silver nanoparticles. The results certified that All AgNPs have a spherical shape with polydisperse size in all media, including PVP, PEG, and chitosan. The smallest AgNPs have been produced in PVP medium with an averaged smallest size of 11.62 nm. Based on this result, PVP is the preferred medium to produce AgNPs with the smallest size and good stability. The produced silver nanoparticles have been successfully employed as an antibacterial agent, which is experimentally demonstrated by using Escherichia coli and Staphylococcus aureus. The result certified that the produced silver nanoparticles could effectively kill the bacteria with a killing percentage of 99.6 to 100%.

Morphological and Dimensional Properties of Colloidal Silver Nanoparticles Prepared under Microwave Irradiation

2015 ◽  
Vol 1101 ◽  
pp. 138-143 ◽  
Author(s):  
Harjono ◽  
Yoki Yulizar
Keyword(s):  
Silver Nanoparticles ◽  
Microwave Irradiation ◽  
Irradiation Time ◽  
Colloidal Silver ◽  
Ag Nps ◽  
Dimensional Properties ◽  
Cubic Form ◽  
Colloidal Silver Nanoparticles ◽  
Transmission Electron ◽  
Vis Spectroscopy

In this paper we report the effect of irradiation time on the morphological and dimensional properties of colloidal silver nanoparticles (AgNPs) using sodium citrate and silver nitrate as reductant and oxidant, respectively under microwave irradiation. The prepared NPs were characterized by UV–vis spectroscopy, Particle size analyzer (PSA), transmission electron microscopy (TEM) and selected areas electron diffraction (SAED). The formation of Ag NPs was confirmed by the appearance of a surface plasmon absorption between 411-425 nm. PSA showed that the colloidal nanoparticles had a diameters ranging from 25.5-41.2 nm. TEM images showed that the diameter of the silver nanoparticles in accordance with the results obtained using PSA. The rings patterns are in good agreement with the standard values of the facecentered-cubic form of silver nanocrystals.

scholarly journals Biosynthesis of Silver Nanoparticles from Desmodium triflorum: A Novel Approach Towards Weed Utilization

2011 ◽  
Vol 2011 ◽  
pp. 1-8 ◽  
Author(s):  
Naheed Ahmad ◽  
Seema Sharma ◽  
V. N. Singh ◽  
S. F. Shamsi ◽  
Anjum Fatma ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Visible Spectrum ◽  
Silver Ions ◽  
Single Step ◽  
Water Soluble ◽  
Novel Approach ◽  
Transmission Electron ◽  
Antioxidative Agents ◽  
Ascorbic Acids ◽  
20 Nm

A single-step environmental friendly approach is employed to synthesize silver nanoparticles. The biomolecules found in plants induce the reduction of Ag+ ions from silver nitrate to silver nanoparticles (AgNPs). UV-visible spectrum of the aqueous medium containing silver ions demonstrated a peak at 425 nm corresponding to the plasmon absorbance of silver nanoparticles. Transmission electron microscopy (TEM) showed the formation of well-dispersed silver nanoparticles in the range of 5–20 nm. X-ray diffraction (XRD) spectrum of the AgNPs exhibited 2θ values corresponding to the silver nanocrystal. The process of reduction is extracellular and fast which may lead to the development of easy biosynthesis of silver nanoparticles. Plants during glycolysis produce a large amount of H+ ions along with NAD which acts as a strong redoxing agent; this seems to be responsible for the formation of AgNPs. Water-soluble antioxidative agents like ascorbic acids further seem to be responsible for the reduction of AgNPs. These AgNPs produced show good antimicrobial activity against common pathogens.

Sign in / Sign up

Export Citation Format

Share Document