Suspensive Electrode Formation in Pulsed Sonoelectrochemical Synthesis of Silver Nanoparticles

Langmuir ◽  
2002 ◽  
Vol 18 (12) ◽  
pp. 4736-4740 ◽  
Author(s):  
Yehoshua Socol ◽  
Oleg Abramson ◽  
Aharon Gedanken ◽  
Yitzhak Meshorer ◽  
Larisa Berenstein ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Sonoelectrochemical Synthesis

scholarly journals Sonoelectrochemical synthesis of silver nanoparticles in polyvinylpyrrolidone solutions

2021 ◽  
Vol 4 (1) ◽  
pp. 82-87
Author(s):  
M. V. Shepida ◽  
◽  
M. A. Sozanskyi ◽  
Yu. V. Sukhatskiy ◽  
A. S. Mazur ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Formation Rate ◽  
Ultrasonic Field ◽  
Colloidal Solutions ◽  
Complex Ions ◽  
Diffusion Kinetic ◽  
Wide Range ◽  
Sonoelectrochemical Synthesis ◽  
The Stability ◽  
Sonochemical Reduction

The results of investigations of the influence of main parameters (surfactant concentration and temperature) on the synthesis of silver nanoparticles (AgNPs) by the sonoelectrochemical method in polyvinylpyrrolidone (PVP) solutions by cyclic voltammetry (CVA) are presented. It is shown that the ultrasonic field (22 kHz) leads to an increase in the anodic and cathodic currents by ~30 %. A scheme of the AgNPs formation has been proposed, which includes the following main processes: 1) dissolution of sacrificial silver anodes at E = 0.2...1.0 V with the formation of [AgPVP]+ complex ions; 2) cathodic and sonochemical reduction of the latter to Ag(0); 3) formation of AgNPs. It has been established that with an increase in PVP concentration from 1 to 4 g·L-1, the anodic and cathodic currents decrease by 40–60 %. The formation rate of AgNPs also decreases. The growth of anodic and cathodic currents and the formation rate of nanoparticles in the range of 20…60 °C corresponds to the diffusion-kinetic action of the temperature factor. The CVA curves practically do not change in time, which indicates the stability of anodic and cathodic processes at prolonged sonoelectrochemical synthesis. The character of the UV-Vis spectra of AgNPs colloidal solutions in PVP with the 405…410 nm absorption maximum is the same in a wide range of nanoparticle concentrations.

scholarly journals Sonoelectrochemical Synthesis of Silver Nanoparticles in Sodium Polyacrylate Solution

2021 ◽  
Vol 11 (4) ◽  
pp. 12202-12214
Keyword(s):  
Silver Nanoparticles ◽  
Nanoparticle Synthesis ◽  
Ultrasonic Field ◽  
Sodium Polyacrylate ◽  
Silver Colloids ◽  
High Antibacterial Activity ◽  
Vis Spectroscopy ◽  
Sonoelectrochemical Synthesis ◽  
The Stability ◽  
Increasing Temperature

The paper shows the effectiveness of a “green” synthesis of silver nanoparticles (AgNPs) in sodium polyacrylate (NaPA) solutions by sonoelectrochemical method using silver sacrificial anodes. Using the cyclic voltammetry in the ultrasonic field in the range of E from 1.0 to -1.0 V, the temperature and NaPA concentration are the main parameters influencing the rate of synthesis and the size of AgNPs. As these parameters increase, the rate of nanoparticle synthesis increases. According to TEM studies, with increasing temperature and decreasing NaPA concentration, there is a tendency to increase the size of AgNPs. However, in all of the cases, the size of AgNPs does not exceed 30 nm. Using the UV–Vis spectroscopy, it was found that the position of the absorption peak at c.a. 500 nm, corresponding to the silver nanoparticles, is practically not shifted during numerous cycles. This fact may indicate the stability of sonoelectrochemical synthesis of AgNPs in time. Synthesized AgNPs revealed high antibacterial activity against gram-positive and gram-negative strains of typical pathogens of nosocomial infections, demonstrating the prospect of using sonoelectrochemical technique for obtaining silver colloids as a component of bactericidal drugs.

Synthesis, performance and growth mechanism of silver nanoparticle coated SERS fiber probe

2019 ◽  
Vol 107 (3) ◽  
pp. 305
Author(s):  
Mengmei Geng ◽  
Yuting Long ◽  
Tongqing Liu ◽  
Zijuan Du ◽  
Hong Li ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Absorption Spectrum ◽  
Reaction Time ◽  
Growth Mechanism ◽  
Fiber Optic ◽  
Fiber Optic Probe ◽  
Visible Absorption ◽  
Fiber Probe ◽  
Surface Enhanced Raman ◽  
Optic Probe

Surface-enhanced Raman Scattering (SERS) fiber probe provides abundant interaction area between light and materials, permits detection within limited space and is especially useful for remote or in situ detection. A silver decorated SERS fiber optic probe was prepared by hydrothermal method. This method manages to accomplish the growth of silver nanoparticles and its adherence on fiber optic tip within one step, simplifying the synthetic procedure. The effects of reaction time on phase composition, surface plasmon resonance property and morphology were investigated by X-ray diffraction analysis (XRD), ultraviolet-visible absorption spectrum (UV-VIS absorption spectrum) and scanning electron microscope (SEM). The results showed that when reaction time is prolonged from 4–8 hours at 180 °C, crystals size and size distribution of silver nanoparticles increase. Furthermore, the morphology, crystal size and distribution density of silver nanoparticles evolve along with reaction time. A growth mechanism based on two factors, equilibrium between nucleation and growth, and the existence of PVP, is hypothesized. The SERS fiber probe can detect rhodamin 6G (R6G) at the concentration of 10−6 M. This SERS fiber probe exhibits promising potential in organic dye and pesticide residue detection.

The Effect of Silver Nanoparticles on Blood Cells in Rats

2012 ◽  
Vol 1 (1) ◽  
Author(s):  
S. Rezaei-Zarchi ◽  
M. Taghavi-Foumani ◽  
S. Razavi Sheshdeh ◽  
M. Negahdary ◽  
G. Rahimi
Keyword(s):  
Silver Nanoparticles ◽  
Blood Cells

Synthesis and Characterization of Silver Nanoplates by a Seed-mediated Method

2019 ◽  
Vol 29 (3) ◽  
Author(s):  
Mai Ngọc Tuan Anh
Keyword(s):  
Hydrogen Peroxide ◽  
Silver Nanoparticles ◽  
Ascorbic Acid ◽  
Silver Nitrate ◽  
Sodium Borohydride ◽  
Trisodium Citrate ◽  
Synthesis And Characterization ◽  
Silver Nanoplates ◽  
Seed Mediated

Silver nanoplates (SNPs) having different size were synthesized by a seed-mediated method. The seeds -silver nanoparticles with 4 – 6 nm diameters were synthesized first by reducing silver nitrate with sodium borohydride in the present of Trisodium Citrate and Hydrogen peroxide. Then these seeds were developed by continue reducing Ag\(^+\) ions with various amount of L-Ascorbic acid to form SNPs. Our analysis showed that the concentratrion of L-Ascorbic acid, a secondary reducing agent, played an important role to form SNPs. In addition, the size and in-plane dipole plasmon resonance wavelenght of silver nanoplates were increased when the concentration of added silver nitrate increased. The characterization of SNPs were studied by UV-Vis, FE-SEM, EDS and TEM methods.

EFFECT OF SILVER NANOPARTICLES ON THE FLUORESCENCE INTENSITY OF RHODAMINE 6G AND SULFORHODAMINE 101

2016 ◽  
Vol 75 (11) ◽  
pp. 1001-1008
Author(s):  
S.V. Nikolayev ◽  
V. V. Pozhar ◽  
M. I. Dzyubenko ◽  
K. S. Nikolayev
Keyword(s):  
Silver Nanoparticles ◽  
Fluorescence Intensity ◽  
Rhodamine 6G ◽  
Sulforhodamine 101
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