Effect of stabilizer concentration on the size of silver nanoparticles synthesized through chemical route

2020 ◽  
pp. 108319
Author(s):  
Sujoy Das ◽  
Krishnan Bandyopadhyay ◽  
M.M. Ghosh
Keyword(s):  
Silver Nanoparticles ◽  
Chemical Route ◽  
Stabilizer Concentration

scholarly journals Dielectric and AC Conductivity Studies in PPy-Ag Nanocomposites

2015 ◽  
Vol 2015 ◽  
pp. 1-5 ◽  
Author(s):  
K. Praveenkumar ◽  
T. Sankarappa ◽  
J. S. Ashwajeet ◽  
R. Ramanna
Keyword(s):  
Activation Energy ◽  
Silver Nanoparticles ◽  
Dielectric Properties ◽  
Ac Conductivity ◽  
Conductivity Data ◽  
Chemical Route ◽  
Polaron Hopping ◽  
Dielectric Data ◽  
First Time ◽  
Hopping Model

Polypyrrole and silver nanoparticles have been synthesized at 277 K by chemical route. Nanoparticles of polypyrrole-silver (PPy-Ag) composites were prepared by mixing polypyrrole and silver nanoparticles in different weight percentages. Dielectric properties as a function of temperature in the range from 300 K to 550 K and frequency in the range from 50 Hz to 1 MHz have been measured. Dielectric constant decreased with increase in frequency and temperature. Dielectric loss decreased with increase in frequency and increased with increase in temperature. Using dielectric data AC conductivity has been determined. Conductivity was found to be in the order of 10−3 (Ω−1 m−1) and it increased with increase in temperature. Temperature variation of conductivity data has been analyzed in the light of Mott’s polaron hopping model. Activation energy for conduction has been determined. Activation energy was determined to be in the order of meV and it has increased with increase in frequency and Ag nanoparticles content. This is the first time that PPy-Ag nanocomposites have been investigated for dielectric properties and AC conductivity and data analyzed thoroughly.

scholarly journals Coating of Polyetheretherketone Films with Silver Nanoparticles by a Simple Chemical Reduction Method and Their Antibacterial Activity

Coatings ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 91 ◽  
Author(s):  
Andrés Cruz-Pacheco ◽  
Deysi Muñoz-Castiblanco ◽  
Jairo Gómez Cuaspud ◽  
Leonel Paredes-Madrid ◽  
Carlos Parra Vargas ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Metallic Nanoparticles ◽  
Chemical Reduction ◽  
Single Layer ◽  
Polymeric Substrate ◽  
Chemical Route ◽  
Force Microscopy ◽  
Transmission Electron ◽  
Cellular Replication

The coating of polymeric substrate polyetheretherketone (PEEK) with silver nanoparticles (AgNPs) was carried out by a wet chemical route at room temperature. The coating process was developed from the Tollens reagent and D-glucose as reducing agent. The resulting composite exhibited antimicrobial activity. The PEEK films were coated with a single layer and two layers of silver nanoparticles in various concentrations. The crystallographic properties of the polymer and the silver nanoparticles were analyzed by X-ray diffraction (XRD). Fourier transform infrared spectra (FTIR) show the interaction between the silver nanoparticles with the polymeric substrate. Transmission electron microscope (TEM) images confirmed the obtaining of metallic nanoparticles with average sizes of 25 nm. It was possible to estimate the amount of silver deposited on PEEK with the help of thermogravimetric analysis. The morphology and shape of the AgNPs uniformly deposited on the PEEK films was ascertained by the techniques of scanning electron microscopy (SEM) and atomic force microscopy (AFM), evidencing the increase in the amount of silver by increasing the concentration of the metal precursor. Finally, the antibacterial activity of the films coated with Ag in Escherichia coli, Serratia marcescens and Bacillus licheniformis was evaluated, evidencing that the concentration of silver is crucial in the cellular replication of the bacteria.

scholarly journals Preparation and Characterization of Silver Nanospheroids: Theoretical and Experimental Approaches

2017 ◽  
Vol 9 (2) ◽  
pp. 63 ◽  
Author(s):  
Mounira Amraoui ◽  
Chouaib Daoudi ◽  
Mohamed Remram
Keyword(s):  
Silver Nanoparticles ◽  
Silver Nanoparticle ◽  
Shape Control ◽  
Size Structure ◽  
Spectroscopic Characterization ◽  
Dipole Approximation ◽  
Absorption Bands ◽  
Chemical Route ◽  
Continuous Precipitation

We synthesized silver nanoparticles of different sizes and forms as function of the molar masses of AgNO3, in two different solvent mediums (ethanol, methanol). We carried out the synthesis according to standard chemical route with major modifications. The spectroscopic characterization showed the presence of two distinct absorption bands; the first band at 300 nm and the second shifted to 440 nm. We found a multipolar phenomenon depending on the temperature. The shape and size predicted by the numerical model are conform to the experimental results. The study demonstrated that the nanoparticles have a spheroidal shape. Full Text: PDF ReferencesCecilia Noguez, "Surface Plasmons on Metal Nanoparticles: The Influence of Shape and Physical Environment", J. Phys. Chem. C 111(10), 3806 (2007). CrossRef M. Amraoui , C. Daoudi and M. Remram, Int.Sc.Sci and Tech. Conf. 2015 Ayd?n,Turkey , 11-13 May , 2015 (ISSTC 2015).M. I Gonzalez-Sanchez et al, "Silver nanoparticle based antibacterial methacrylate hydrogels potential for bone graft applications", Mater. Sci. Eng C. Mater. Biol. Appl 50, 332 (2015). CrossRef Xinyi Dong et al, "Shape Control of Silver Nanoparticles by Stepwise Citrate Reduction", J. Phys. Chem. C 113(16), 6573 (2009). CrossRef A. Wolak, M. Grabiec, O. Véron, J. ?P. Blondeau and K. Dzierżęga, "Nanosecond infrared laser-induced precipitation of silver nanoparticles in glass", Phot. Lett. Poland 5(2), 54 (2013). CrossRef A. Zielinska, E. Skwarek, A. Zaleska, M. Gazda and J. Hupka, "Preparation of silver nanoparticles with controlled particle size", Procedia Chemistry 1, 1560 (2009). CrossRef K-S.Chou, Y.Chang and L. Hua, "Studies on the Continuous Precipitation of Silver Nanoparticles", Ind.Eng.Chem.Res 51(13) 4905 (2012). CrossRef A. M. Atta, H. A. Al-Lohedan, A. O. Ezzat, "Synthesis of Silver Nanoparticles by Green Method Stabilized to Synthetic Human Stomach Fluid", Molecules 19(5) 6737 (2014). CrossRef Botasini, S, Méndez, E. "Silver nanoparticle aggregation not triggered by an ionic strength mechanism", J Nanopart Res 15, 1526 (2013). CrossRef V. Amendola, O.M. Bakr, F. Stellacci, "A Study of the Surface Plasmon Resonance of Silver Nanoparticles by the Discrete Dipole Approximation Method: Effect of Shape, Size, Structure, and Assembly", Plasmonics 5(1) 85 (2010). CrossRef L. Jeong, W. Ho Park "Preparation and Characterization of Gelatin Nanofibers Containing Silver Nanoparticles", Int. J. Mol. Sci 15, 6857 (2014). CrossRef Peter Monk, Finite element method for Maxwell's equations, (Oxford, Clarendon Press 2003). DirectLinkM.D. Abramoff, P.J. Magalhaes, S.J. Ram, "Image processing with ImageJ", Biophotonics International 11(7), 36 (2004). DirectLink Edward D.Palik, Handbook of optical constants of solids (California, Academic Press Inc, 1985). DirectLink

Synthesis of Silver Nanoparticles using Facile Wet Chemical Route

2009 ◽  
Vol 59 (4) ◽  
pp. 447-455 ◽  
Author(s):  
P. Sahoo ◽  
S. Kamal ◽  
T. Kumar ◽  
B. Sreedhar ◽  
A. Singh ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Chemical Route ◽  
Wet Chemical ◽  
Wet Chemical Route

scholarly journals EFFECT OF SILVER NANOPARTICLE-MEDIATED WOUND THERAPY ON BIOCHEMICAL, HEMATOLOGICAL, AND HISTOLOGICAL PARAMETERS

2018 ◽  
Vol 11 (3) ◽  
pp. 251
Author(s):  
Pallavi Singh Chauhan ◽  
Vikas Shrivastava ◽  
Prasad Gbks ◽  
Rajesh Singh Tomar
Keyword(s):  
Electron Microscopy ◽  
Wound Healing ◽  
Silver Nanoparticles ◽  
Silver Nanoparticle ◽  
Povidone Iodine ◽  
Wistar Rat ◽  
Treated Group ◽  
In Vivo Studies ◽  
Control Group ◽  
Chemical Route

 Objective: Green synthesis of nanoparticles has been used as an alternative, efficient, less expensive, and ecofriendly method. Ancient approaches employed for nanoparticle fabrication were chemical and physical methods having various disadvantages as they are costly and potentially harmful to the environment, use of harsh chemicals and stringent protocol for synthesizing nanoparticles. The present study is focused on the synthesis of silver nanoparticles by bio-availed as well as chemical route and evaluation of their wound healing potential in Wistar rat model.Methods: Extraction of Syzygium cumini was done and was used for silver nanoparticle synthesis. The synthesized nanoparticles were characterized by ultraviolet-visible spectroscopy, Fourier transform infrared spectroscopy, scanning electron microscopy, and transmission electron microscopy, which confirms the availability of nanosilver particles with marginally spherical morphology. The particles were then carried forward for treating impaired diabetic wounds in Wistar rat models. Regular photography was done and wound healing parameters were monitored throughout the study along with analyzing other parameters such as biochemical, hematological, and histological parameters.Results: The study showed that the sizes of the synthesized nanoparticles are below 100 nm. The results obtained from in vivo studies showed efficient wound healing potential of silver nanoparticles as compared to pre-existing drug povidone-iodine, i.e., the percentage reduction in wound area after therapy is 96.09% in case of biosynthesized silver nanoparticle-treated group, 97.7% reduction in chemically synthesized silver nanoparticle-treated group, 64.28% reduction in case of pre-existing drug povidone-iodine-treated group, 37.5% reduction in case of diabetic control group (diabetic), and 97.5% reduction in normal control group (non-diabetic). Results showed that biosynthesized silver nanoparticles showed less toxicity with respect to liver and kidney functions. Skin histology results showed increased sign of wound healing in biosynthesized silver nanoparticles. Hematology results showed no such variation.Conclusion: The study will help to synthesize new economically viable potential biosynthesized nanoparticles along with providing the approach to develop the medication at nanoscale level.

Cytotoxicity, genotoxicity and alteration of cellular antioxidant enzymes in silver nanoparticles exposed CHO cells

RSC Advances ◽  
2015 ◽  
Vol 5 (44) ◽  
pp. 34927-34935 ◽  
Author(s):  
Kumud Kant Awasthi ◽  
Anjali Awasthi ◽  
Rajbala Verma ◽  
Narender Kumar ◽  
Partha Roy ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Antioxidant Enzymes ◽  
Potential Risk ◽  
Chinese Hamster Ovary ◽  
Cho Cells ◽  
Human Exposure ◽  
Chinese Hamster ◽  
Ag Nps ◽  
Chemical Route

The broad applications of silver nanoparticles (Ag NPs) increase human exposure, thus potential risk associated with their toxicity; therefore, the toxicity of Ag NPs, synthesized by chemical route was studied using Chinese Hamster Ovary (CHO) cells.

A wet-chemical route for the decoration of CNTs with silver nanoparticles

Carbon ◽  
2006 ◽  
Vol 44 (2) ◽  
pp. 381-383 ◽  
Author(s):  
Yuyang Liu ◽  
Jing Tang ◽  
Xianqiong Chen ◽  
Wei Chen ◽  
G.K.H. Pang ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Chemical Route ◽  
Wet Chemical ◽  
Wet Chemical Route

Structures of chemically stabilized ceramics

1993 ◽  
Vol 51 ◽  
pp. 924-925
Author(s):  
Pratibha L. Gai ◽  
M. A. Saltzberg ◽  
L.G. Hanna ◽  
S.C. Winchester
Keyword(s):  
High Temperature ◽  
Calcium Nitrate ◽  
Nitrate Hexahydrate ◽  
Chemical Route ◽  
Cubic Form ◽  
Tetragonal Form ◽  
Wet Chemical ◽  
Wet Chemical Route ◽  
Final Composition ◽  
Aluminium Nitrate Nonahydrate

Silica based ceramics are some of the most fundamental in crystal chemistry. The cristobalite form of silica has two modifications, α (low temperature, tetragonal form) and β (high temperature, cubic form). This paper describes our structural studies of unusual chemically stabilized cristobalite (CSC) material, a room temperature silica-based ceramic containing small amounts of dopants, prepared by a wet chemical route. It displays many of the structural charatcteristics of the high temperature β-cristobalite (∼270°C), but does not undergo phase inversion to α-cristobalite upon cooling. The Structure of α-cristobalite is well established, but that of β is not yet fully understood.Compositions with varying Ca/Al ratio and substitutions in cristobalite were prepared in the series, CaO:Al2O3:SiO2 : 3-x: x : 40, with x= 0-3. For CSC, a clear sol was prepared from Du Pont colloidal silica, Ludox AS-40®, aluminium nitrate nonahydrate, and calcium nitrate hexahydrate in proportions to form a final composition 1:2:40 composition.

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.

Sign in / Sign up

Export Citation Format

Share Document