scholarly journals Stabilization of Silver Nanoparticles with a Dithiocarbamate Ligand and Formation of Nanocomposites by Combination with Polythiophene Derivative Nanoparticles

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Paris Jonathan Reynoso-García ◽  
Marisol Güizado-Rodríguez ◽  
Victor Barba ◽  
Gabriel Ramos-Ortiz ◽  
Hugo Martínez-Gutiérrez
Keyword(s):  
Silver Nanoparticles ◽  
Absorption Band ◽  
Sodium Citrate ◽  
Average Diameter ◽  
Optoelectronic Device ◽  
Ag Nps ◽  
Spherical Morphology ◽  
Dithiocarbamate Ligand ◽  
The Stability ◽  
Polythiophene Derivative

Spherical morphology for silver nanoparticles (Ag NPs) stabilized with dithiocarbamate (DTC) by reducing silver nitrate with sodium borohydride was obtained, while the addition of sodium citrate and hydrogen peroxide allowed the formation of silver nanotriangles (Ag NTs). Solutions of bright yellow and blue colors characteristic of both morphologies were observed. UV-vis optical analysis of NPs stabilized with DTC showed a plasmonic absorption band at 393 nm characteristic for spherical morphology, while two bands were observed at 332 nm and 762 nm, and a shoulder around 500 nm for the triangular morphology; with these spectra each morphology was confirmed. In these spectra an absorption band between 250 and 260 nm confirms the presence of DTC ligand. The stability of the NPs was achieved using an 8.69 × 10-3 mM solution of 4-(ethylaminodithiocarbamate) methylpyridine di-n-butyltin (IV) through a transmetallation reaction. Silver nanoparticles (Ag NPs) with spherical morphology of average diameter of 12.7 ± 1.2 nm and triangular morphology with 28.9 ± 0.8 nm for each side of the triangles were analyzed by high resolution scanning electron microscopy (HR-SEM). UV-vis spectra also showed the stability of NPs with DTC for more than three months. A copolymer derived of 3-hexylthiophene with (E)-2-(ethyl(4-((4-nitrophenyl) diazenyl) phenyl) amino) ethyl 2-(thiophen-3-yl) acetate (PA) was tested to get polymer NPs by reprecipitation method using THF/water systems. PA Polymer NPs having average diameter of 9.0 ± 1.7 nm were found. By quick and easy procedure, the formation of nanocomposite (NC) of spherical Ag NPs and PA polymer NPs was reached. This NC could be used as imaging agent, electrochemical biosensor, and photonic and optoelectronic device materials.

scholarly journals Impact of chemical composition of ecotoxicological test media on the stability and aggregation status of silver nanoparticles

2016 ◽  
Vol 3 (2) ◽  
pp. 418-433 ◽  
Author(s):  
George Metreveli ◽  
Bianca Frombold ◽  
Frank Seitz ◽  
Alexandra Grün ◽  
Allan Philippe ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Chemical Composition ◽  
Ag Nps ◽  
Ecotoxicological Test ◽  
The Stability

Aggregation status of Ag NPs in ecotoxicological test media is controlled by the Ca2+/Mg2+ ratio, presence of Cl− and Br− and NOM quality.

Fabrication and Characterization of Cellulose Acetate Ultrafine Fiber Containing Silver Nanoparticles by Electrospinning

2011 ◽  
Vol 337 ◽  
pp. 116-119 ◽  
Author(s):  
Dong Mei Zhao ◽  
Qing Mao Feng ◽  
Li Li Lv ◽  
Jian Li
Keyword(s):  
Electron Microscopy ◽  
Silver Nanoparticles ◽  
Cellulose Acetate ◽  
Average Diameter ◽  
Xrd Analysis ◽  
Water Soluble ◽  
Ag Nps ◽  
Ultrafine Fibers ◽  
Transmission Electron ◽  
Electrospinning Method

Silver nanoparticles (Ag NPs)/cellulose acetate (CA) composite ultrafine fibers were successfully prepared by the electrospinning method. Water-soluble Ag NPs were directly mixed into CA polymer fibers to form organic–inorganic composite ultrafine fibers. The optical property of Ag NPs was measured by ultraviolet-visble spectrometer (UV-vis). The presence and identification of crystalline of Ag NPs were confirmed by XRD analysis. Transmission electron microscopy (TEM) images showed that silver nanoparticles (Ag NPs) with an average diameter of 5–15 nm were obtained and were well distributed in the CA ultrafine fibers. The morphologies of the as-prepared electrospun Ag NPs/CA composite ultrafine fibers were characterized by scanning electron microscopy (SEM) and TEM. The composition of fibers was characterized by FTIR spectrometer.

scholarly journals Bactericidal and In-Vitro Cytotoxic Efficacy of Silver Nanoparticles (Ag-NPs) Fabricated by Endophytic Actinomycetes and Their Use as Coating for the Textile Fabrics

Nanomaterials ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 2082 ◽  
Author(s):  
Salem S. Salem ◽  
Ehab F. EL-Belely ◽  
Gniewko Niedbała ◽  
Maryam M. Alnoman ◽  
Saad El-Din Hassan ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Silver Nanoparticles ◽  
Inhibition Zone ◽  
In Vitro Cytotoxicity ◽  
Ag Nps ◽  
X Ray ◽  
Vis Spectroscopy ◽  
Ft Ir ◽  
The Stability

An endophytic strain of Streptomyces antimycoticus L-1 was isolated from healthy medicinal plant leaves of Mentha longifolia L. and used for the green synthesis of silver nanoparticles (Ag-NPs), through the use of secreted enzymes and proteins. UV–vis spectroscopy, Fourier-transform infrared (FT-IR), transmission electron microscopy (TEM), X-ray diffraction (XRD), and dynamic light scattering (DLS) analyses of the Ag-NPs were carried out. The XRD, TEM, and FT-IR analysis results demonstrated the successful biosynthesis of crystalline, spherical Ag-NPs with a particle size of 13–40 nm. Further, the stability of the Ag-NPs was assessed by detecting the surface Plasmon resonance (SPR) at 415 nm for one month or by measuring the NPs surface charge (−19.2 mV) by zeta potential analysis (ζ). The green-synthesized Ag-NPs exhibited broad-spectrum antibacterial activity at different concentrations (6.25–100 ppm) against the pathogens Staphylococcus aureus, Bacillus subtilis Pseudomonas aeruginosa, Escherichia coli, and Salmonella typhimurium with a clear inhibition zone ranging from (9.5 ± 0.4) nm to (21.7 ± 1.0) mm. Furthermore, the green-synthesized Ag-NPs displayed high efficacy against the Caco-2 cancerous cell line (the half maximal inhibitory concentration (IC50) = 5.7 ± 0.2 ppm). With respect to antibacterial and in-vitro cytotoxicity analyses, the Ag-NPs concentration of 100 ppm was selected as a safe dose for loading onto cotton fabrics. The scanning electron microscopy connected with energy-dispersive X-ray spectroscopy (SEM-EDX) for the nano-finished fabrics showed the distribution of Ag-NPs as 2% of the total fabric elements. Moreover, the nano-finished fabrics exhibited more activity against pathogenic Gram-positive and Gram-negative bacteria, even after 10 washing cycles, indicating the stability of the treated fabrics.

Optical and Morphological Properties of Silver Nanoparticles Synthesis by Q-Switched Nd-YAG Laser

2021 ◽  
Vol 1039 ◽  
pp. 215-224
Author(s):  
Noor Fakher Khdr ◽  
Bassam G. Rasheed ◽  
Baida M. Ahmed
Keyword(s):  
Surface Roughness ◽  
Silver Nanoparticles ◽  
Ag Nanoparticles ◽  
Laser Energy ◽  
Average Diameter ◽  
Laser Wavelength ◽  
Morphological Properties ◽  
Average Surface Roughness ◽  
Ag Nps ◽  
Average Surface

Abstract. Laser ablation of a silver target immersed in distilled water utilizing Nd: YAG laser with wavelengths of 532nm,1064nm, and 1320nm was carried out to fabricate silver nanoparticles. The synthesis of Ag NPs was carried out using various laser energy (200-1000 mJ) and different pulses (200-1000 pulse). Optical properties for the Ag nanoparticles solution were tested using UV-Visible spectrum, while the morphological properties for the Ag-nanoparticles solution after deposited on glass were tested using the atomic force microscope (AFM). The results showed that the synthesis of the Ag-nanoparticles using pulsed laser ablation in liquid (PLAL) (water) gives nanoparticles with homogeneous grain distribution and uniform surface roughness. It was found that the absorption peaks of Ag NPs increase by increasing the number of pulses shoot for the same laser wavelength and laser energy, and the reported maximum value of absorption peak is 0.363 when using 1000 pulses shoot. AFM results showed that the average diameter of the Ag NPs prepared by PLAL increases with increasing the laser wavelength. However, when using laser wavelengths of 1320nm,1064nm, and 532nm, the resulted average diameter of silver nanoparticles will be 55.38nm, 34.18nm, and 30.3nm, respectively. Finally, the average surface roughness of the Ag NPs prepared by PLAL increased with increasing the laser wavelength. The obtained average surface roughness of silver nanoparticles when using wavelengths of 1320nm,1064nm, and 532nm were 2.75nm, 1.19nm, and1.06nm, respectively.

scholarly journals Albumin/Ag Nanoparticles Synthesized by Using UV-Irradiation and Estimation of Their Antibacterial Activity

2020 ◽  
pp. 36-45
Author(s):  
Randa Fawzi Elsupikhe ◽  
Tahani Soliman Alfazani ◽  
Fawzia Muftah Al-Jazwia ◽  
Hitham. Abo-Eisa ◽  
Imperiyka Hammad ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Uv Irradiation ◽  
Irradiation Time ◽  
Average Diameter ◽  
Bulk Sample ◽  
Inhibitory Effect ◽  
Optimum Conditions ◽  
Ag Nps ◽  
Albumin Nanoparticles ◽  
Uv Lamp

Nano-scale (less than 100 nm) materials have received wide attention because of their rare properties that differ significantly from a bulk sample of the same material. In this research, a physical irradiation method by using UV lamp was established for preparation nanoparticles colloids of silver nanoparticles (Ag-NPs) with an eco-friendly stabilizer (Albumin). The preparation process was carried out using silver nitrate (AgNO3) in aqueous albumin at room temperature. The effects of UV-irradiation time and the concentrations of Ag+ and albumin on the particle size have been investigated. Moreover, the antibacterial effect of the Ag/Albumin nanoparticles has been tested. The results showed that, the UV–irradiation can influence the Ag-NPs size, which the of Nps  decreases with the UV–irradiation increases. The morphological study demonstrated well-dispersed spherical Ag-NPs with an average diameter of about 29 nm at the optimum conditions. The antibacterial results exhibited a significant inhibitory effect for the Ag-NPs that synthesized in this work. The current fabrication method of the silver nanoparticles colloid could be extended to other metals such as Cu- Nps and may possibly find various additional applications.    

scholarly journals Silver nanoparticles: Green Synthesis and Their Antibacterial efficiency

2021 ◽  
Vol 59 (2) ◽  
pp. 214
Author(s):  
Dung Ngo Thanh ◽  
Nguyet Ha Minh ◽  
Tam Le Thi Thanh ◽  
Lu Le Trong
Keyword(s):  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Green Synthesis ◽  
Silver Nitrate ◽  
Tannic Acid ◽  
Ag Nanoparticles ◽  
Sodium Citrate ◽  
Reducing Agents ◽  
Ag Nps ◽  
Silver Nps

In this study, silver nanoparticles were synthesized from aqueous silver nitrate through a simple and eco-friendly route using a combination of two reducing agents: sodium citrate and tannic acid. By this method, the obtained Ag nanoparticles (NPs) were stable within the studied period of six months. Besides, both TEM images and UV-Vis results showed that the size of silver NPs could be controlled by changing the concentration of tannic acid. The antibacterial ability of Ag NPs with different sizes were also examined. In detail, the smaller the Ag NPs were, the more efficient their antibacterial activity was.

scholarly journals Chemical Synthesis of Silver Nanoparticles Using Tri-sodium Citrate, Stability Study and Their Characterization

2020 ◽  
pp. 37-50
Author(s):  
Prem Santhi Yerragopu ◽  
Sharanagouda Hiregoudar ◽  
Udaykumar Nidoni ◽  
K. T. Ramappa ◽  
A. G. Sreenivas ◽  
...  
Keyword(s):  
Particle Size ◽  
Silver Nanoparticles ◽  
Sodium Citrate ◽  
Structural Characteristics ◽  
Average Particle Size ◽  
Stability Study ◽  
Average Particle ◽  
Ag Nps ◽  
Stirring Time ◽  
Absorbance Peak

The present work was aimed to study the synthesis of silver nanoparticles (Ag NPs) using Tri-Sodium Citrate (TSC), stability study of synthesized Ag NPs and their characterization. Synthesis of Ag NPs has been carried out by maintaining different conditions such as TSC concentration (0.50, 1.00 and 1.50%), AgNO3 concentration (0.50, 1.00 and 1.50 mM) and stirring time (10, 15 and 20 min). The stability study of synthesized Ag NPs conducted for 30 days without adding any stabilizing agents. The characterization of synthesized Ag NPs was carried out for different parameters like particle size and zeta potential using particle size analyzer, absorbance peak by UV-Visible spectrophotometer, morphology by Scanning Electron Microscope (SEM), crystallinity by X-Ray Diffractometer (XRD) and material structural characteristics by Atomic Force Microscope (AFM). The stable chemically synthesized Ag NPs were obtained at C20 (AgNO3 concentration of 1.5 mM, TSC 1.5% and stirring time 20 min) (desirability 99.97%), with average particle size of 22.14 nm and average absorbance peak of 449.85 nm.

scholarly journals Nanoencapsulation of Silver-Based Antimicrobial Drugs

2014 ◽  
Vol 70 (a1) ◽  
pp. C1644-C1644
Author(s):  
Jacinthe Gagnon ◽  
Rachel Caruso ◽  
Katharina Fromm
Keyword(s):  
Silver Nanoparticles ◽  
Antimicrobial Agents ◽  
Cell Attachment ◽  
Alveolar Epithelial Cells ◽  
Ag Nps ◽  
Antimicrobial Drugs ◽  
Alveolar Epithelial ◽  
Low Cytotoxicity ◽  
The Stability ◽  
Silver Compounds

Implant-associated infections still remain an issue in medicine and can cause various medical complications. In order to ensure proper host-cell integration and biocompatibility to an implant, it is essential to prevent bacterial adhesion during the critical period of 6 hours after surgery. Moreover, as the implants are increasingly used in medicine, bacteria are becoming more resistant to antibiotics, in such a way that new developments in preventing and curing infections are more than ever needed. Silver compounds and nanoparticles are gaining more interest from the scientific society as a replacement to antibiotics. However, silver compounds may be too soluble and even toxic for the host. Encapsulation might be very advantageous in order to increase the stability and biocompatibility of silver drugs. In addition, it allows a more controllable release of antimicrobial agents. In this study, ceria nanocapsules with integrated silver nanoparticles (Ag/CeO2 NCs) were synthesized according to the method depicted in the figure below. The capsules were then characterized using XRD, TEM, SEM, and FT-IR. Silver nanoparticles (Ag NPs) are visible on the surface as well as in the cavity of Ag/CeO2 NCs, suggesting that they were integrated within the ceria shell. This system can release silver during a period exceeding 3 months, which demonstrates a good release control of the antimicrobial agent. The Ag/CeO2 NCs have a low cytotoxicity towards human alveolar epithelial cells, but allow only a poor cell attachment. In order to improve the cell attachment on the nanocapsules, as well as to reduce the silver being released, a TiO2 coating around the Ag/CeO2 NCs was added to this system. This resulted in the so-called Ag/CeO2/TiO2 NCs. These novel nanocontainers were also characterized in order to evaluate the cytotoxicity and antimicrobial activity.

scholarly journals Influence of Magnetic Field on Silver Nanoparticles Synthesized by Laser Ablation

2020 ◽  
pp. 341-350
Author(s):  
Zahraa Marid Abbas ◽  
Qusay Adnan
Keyword(s):  
Magnetic Field ◽  
Silver Nanoparticles ◽  
Laser Ablation ◽  
Laser Energy ◽  
Visible Spectrum ◽  
Average Diameter ◽  
Ag Nps ◽  
Fundamental Wavelength ◽  
Silver Target ◽  
The Magnetic Field

      Laser ablation of a silver target immersed in distilled water using Nd:YAG laser with a fundamental wavelength of 1064nm was carried out to fabricate silver nanoparticles (Ag NPs) with different laser energy in the presence and absence of magnetic field. UV-Visible spectrum showed that the nanoparticles are almost spherical in shape. The number of Ag NPs increased by increasing laser energy while their particle size was reduced by increasing  laser energy without magnetic field. In the presence of magnetic field, the size of Ag NPs increased slightly by increasing laser energy. According to AFM results, the presence of magnetic field did not affect the average diameter of Ag NPs. The presence of a magnetic field causes a change in grain size of Ag NPs with increasing laser energy. While XRD data illustrated that the magnetic field causes an  increase in the crystallite size of Ag NPs.

Adsorption of Silver Nanoparticles on Modified Surfaces

2015 ◽  
Vol 645-646 ◽  
pp. 75-79
Author(s):  
Can Gao ◽  
Tan Guo ◽  
Xiu Shen Ye ◽  
Hui Fang Zhang ◽  
Hai Ning Liu ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Self Assembly ◽  
Electrostatic Interactions ◽  
Average Diameter ◽  
Ag Nps ◽  
Electron Microscopic ◽  
Sem Images ◽  
Glass Slides ◽  
Transmission Electron ◽  
Adsorption Processes

Uniform films of silver nanoparticles (Ag NPs) were fabricated by self-assembly on 3-aminopropyltriethoxysilane (APTES) and [3-(2-aminoethyl) aminopropyl] trimethoxysilane (AEAPTES) modified glass slides. A stable Ag NPs suspension was synthesized via the reduction of silver nitrate using sodium citrate. Bulk characteristics of Ag NPs in aqueous solution were carried out by measuring their absorption spectrum, morphology and particle shape using the UV-vis absorption spectroscopy and transmission electron microscopy (TEM), respectively. The average diameter of Ag NPs is about 50 nm. The coverage of adsorbed particles on the modified glasses was measured by scanning electron microscopic imaging (SEM). The SEM images indicate that the Ag NPs films on the glasses are uniform. It is supposed that the adsorption processes are mainly controlled by electrostatic interactions. The adsorption amount of Ag NPs on APTES modified glass slides is much more than the amount on AEAPTES modified glass slides.

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