Shape and stability of silver nanoparticles and their dependence on the conditions of preparation.

2012 ◽  
Vol 1371 ◽  
Author(s):  
M.I. Hernández-Castillo ◽  
O. Zaca-Moran ◽  
P. Zaca-Moran ◽  
M. Rojas-López ◽  
V.L. Gayou ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Reaction Time ◽  
Ag Nanoparticles ◽  
Reduction Procedure ◽  
Visible Spectrophotometry ◽  
Logical Sequence ◽  
Uv Visible ◽  
Citrate Reduction ◽  
Shape And Size

ABSTRACTBy using the citrate reduction procedure we have synthesized Ag nanoparticles, applying several conditions of preparation, being after characterized by UV-visible spectrophotometry. Following a logical sequence, the starting experiment was realized varying the reaction time, after that it was varied the concentration of the reductor agent, and finally it was varied the volume of the reductor agent. According to this methodology, TEM measurements show that firstly we have nanostructures with different shape and size, whereas in the last part of the experiment we have Ag nanoparticles with homogeneous shape and size.

scholarly journals Preparation and characterization of PEG-assisted growth of colloidal Ag nanoparticles

2017 ◽  
Vol 3 (6) ◽  
pp. 65
Author(s):  
Elalyaa M. A. Mohamed ◽  
Wael H. Eisa ◽  
T. A. Abdel-Baset ◽  
S. Mahrous
Keyword(s):  
Silver Nanoparticles ◽  
Ethylene Glycol ◽  
Ag Nanoparticles ◽  
Poly Ethylene Glycol ◽  
Peg 400 ◽  
Green Route ◽  
Uv Visible ◽  
Poly Ethylene ◽  
Transmission Microscope

Colloidal Silver nanoparticles were prepared under mild conditions using poly(ethylene glycol) (PEG) in the presence of PVA as surfactant. Ethylene glycol was used as a reducing agent for the preparation of metal particles at room temperature. Ag+1can be smoothly reduced to silver nanoparticles at ambient condition in PEG 400. UV-visible studies demonstrated that the reducing rate of Ag+1to nano-Ag was remarkably enhanced with the increased amount of the PEG. The transmission microscope images prove that the reduced Ag nanoparticles were spherical in shape. The pathway described here was considered as a green route for preparation of silver nanoparticles.

scholarly journals Detection of silver nanoparticles in seawater at ppb levels using UV–visible spectrophotometry with long path cells

Talanta ◽  
2017 ◽  
Vol 164 ◽  
pp. 257-260 ◽  
Author(s):  
Pablo Lodeiro ◽  
Eric P. Achterberg ◽  
Mohammad S. El-Shahawi
Keyword(s):  
Silver Nanoparticles ◽  
Visible Spectrophotometry ◽  
Uv Visible

Effects of Microwave Irradiation Type on the Morphological and Dimensional Properties of Silver Nanoparticles

2010 ◽  
Vol 11 ◽  
pp. 39-43 ◽  
Author(s):  
Ali Shokuhfar ◽  
S.M. Kazemzadeh ◽  
Mohammad Reza Vaezi ◽  
Amir Hassanjani-Roshan
Keyword(s):  
Silver Nanoparticles ◽  
Microwave Irradiation ◽  
Ag Nanoparticles ◽  
Continuous Process ◽  
Inorganic Nanoparticles ◽  
Conventional Heating ◽  
Continuous Irradiation ◽  
Transmission Electron ◽  
Novel Method ◽  
Uv Visible

Microwave irradiation is a novel method to accelerate the preparation of inorganic nanoparticles as well as various nanostructures such as nanotubes, nanorods, and nanowires. In this research, silver (Ag) nanostructures with various morphologies were prepared via a rapid microwave-assisted technique. The spherical and polygonal Ag nanoparticles were synthesized in the presence of Polyvinilpyroliden (PVP) as stabilizing agent. Ethylene glycol (EG) serves as a solvent. The silver nanoparticles were produced by Continuous and Discontinuous Wave irradiation. The obtained materials were characterized by UV-visible and transmission electron microscopy (TEM). The results present that the size of nanoparticles increase in continuous irradiation. In this process, the morphology of product is polygonal. In the discontinuous process the colloidal particle size is smaller than that obtained from the continuous process. Furthermore, the Ag nanoparticles have spherical shapes. The final data show that microwave processing has unique advantages over conventional heating processes.

scholarly journals GREEN SYNTHESIS NANOPARTIKEL PERAK MENGGUNAKAN EKSTRAK DAUN PUCUK IDAT (Cratoxylum glaucum) SEBAGAI BIOREDUKTOR

2018 ◽  
Vol 1 (2) ◽  
pp. 68
Author(s):  
Verry Andre Fabiani ◽  
Febry Sutanti ◽  
Desti Silvia ◽  
Megawati Ayu Putri
Keyword(s):  
Silver Nanoparticles ◽  
Reaction Time ◽  
Green Synthesis ◽  
Silver Nanoparticle ◽  
Average Particle Size ◽  
Water Extract ◽  
Spherical Shape ◽  
Average Particle ◽  
Sem Image ◽  
Uv Visible

An environment friendly technique for green synthesis of silver nanoparticles has been reported. Silver nanoparticle have been synthesized using water extract of leaves of pucuk idat (Cratoxylum glaucum), commonly known as local Bangka plant. The flavonoid and tannin present in the extract act as reducing agent. AgNO3 0,05 M solution was reducing using the extract at room temperature by stirring. Color changing of the solution was detected at 30 minutes reaction time. The color tends to be darker by the increasing of reaction time. Various techniques used to characterize synthesized nanoparticles are UV-Visible spectrophotometer, x-ray diffraction (XRD) and scanning electron microscopy (SEM). UV-Visible spectrophotometer showed absorbance peak in 405 nm, the XRD shows that silver nanoparticles formed are crystalline. The average particle size of Ag nanoparticles estimated from the Scherrer formula is 35,59 nm, while SEM image shows shape of silver nanoparticle is random and some spherical shape.

scholarly journals Growth of Ag-Nanoparticles: Shape-Directing Role of Silver Ions and Stabilizer in Aqueous Solutions

2010 ◽  
Vol 6 (3) ◽  
pp. 1049-1058
Author(s):  
Zoya Zaheer ◽  
Rafiuddin Rafiuddin
Keyword(s):  
Silver Nanoparticles ◽  
Optical Properties ◽  
Ag Nanoparticles ◽  
Cetyltrimethylammonium Bromide ◽  
Silver Ions ◽  
Average Diameter ◽  
Capping Agent ◽  
Transmission Electron ◽  
Uv Visible

Silver nanoparticles were synthesized using Tulsi leaves extract as reducing as well as a capping agent to reduce the steps and parameters involved in the synthesis. The morphology, stability and optical properties of Ag-nanoparticles depend on reactants and stabilizer, cetyltrimethylammonium bromide (CTAB) concentrations. The silver nanoparticles were characterized by UV-visible spectrophotometer, and transmission electron microscope (TEM). Spherical morphology of the silver nanoparticles with an average diameter of  25 nm. Morphology changed markedly from spherical aggregated to highly polydispersed in presence of CTAB.

Green Synthesis of Silver Nanoparticles Using Elaeis Guineensis from Palm Leaves: Influence of pH in Reaction Kinetic

2015 ◽  
Vol 1113 ◽  
pp. 560-565 ◽  
Author(s):  
Nor Ain Ramli ◽  
Junaidah Jai ◽  
Noorsuhana Mohd Yusof ◽  
Norashikin Ahmad Zamanhuri
Keyword(s):  
Silver Nanoparticles ◽  
Reaction Time ◽  
Green Synthesis ◽  
Reaction Kinetic ◽  
Elaeis Guineensis ◽  
Silver Ions ◽  
Reduction Reaction ◽  
Transmission Electron ◽  
Uv Visible ◽  
Influence Of Ph

In this research, green synthesis of silver nanoparticles using elaeis guineensis leaves extract was investigated and the influence of pH and reaction time in the reaction kinetic were studied. UV-visible spectrophotometer was used to monitor the reduction reaction of silver ions to silver nanoparticles and formation of silver nanoparticles shown at sharp peak at pH 10 with λmax of 391 nm. Transmission electron microscopy (TEM) shows silver nanoparticles are polydispersed and irregular shape with size ranging from 55-85 nm. Formation of silver nanoparticles was confirmed by energy dispersive x-ray analysis (EDAX) and crystalline structure using XRD. From this research, it was found that pH 10 influenced the reaction kinetic therefore reduce the reaction time.

scholarly journals Antibacterial activity of zinc oxide with silver nanoparticles

2018 ◽  
Vol 7 (2) ◽  
pp. 98-107
Author(s):  
Fouzia Bourfaa ◽  
Abderhamane Boutelala ◽  
Mohamed Salah Aida ◽  
Nadir Attaf ◽  
Fateh Merouane
Keyword(s):  
Silver Nanoparticles ◽  
Zinc Oxide ◽  
Antibacterial Activity ◽  
Ag Nanoparticles ◽  
Sol Gel ◽  
Zno Films ◽  
Ag Nps ◽  
Health Related ◽  
Uv Visible ◽  
Absorbance Peak

Nanoscale materials and their unique properties make them attractive for research and health -related applications. Silver nanoparticles were synthesised and incorporated in zinc oxide (ZnO) thin films on glass and tissue, in order to study their effect on antibacterial activity. ZnO films with various contents of Ag nanoparticles were prepared by the sol –gel method. Xray diffraction revealed the polycrystalline structure of the films, scanning electron microscopy exhibited their dense and continuous structure and UV-visible spectroscopy for measurement and transmittance was at more than 87%. The absorbance peak of Ag NPS was centred at 351 nm. The diameter of Ag NPS was analysed by Zeta Sizer and the colloids ranged from 2 to 110 nm. The results indicate that ZnO with Ag NPs on tissue can resist the growth of this kind of bacteria, with the zone of inhibition of the bacteria ATTC 700603 at between 8 and 18 mm .Keywords: Ag nanoparticles, zinc oxide, tissue, antibacterial activity.

scholarly journals CYTOTOXIC EFFECT OF PEPTIDE FUNCTIONALIZED SILVER NANOPARTICLES SYNTHESIZED FROM ALOIN ON BREAST CANCER CELL LINE

2019 ◽  
pp. 170-175
Author(s):  
LEEMA ROSE A ◽  
VIDHYA S ◽  
JANEETA PRIYA F ◽  
SABEENA ASHIFA J
Keyword(s):  
Breast Cancer ◽  
Silver Nanoparticles ◽  
Zeta Potential ◽  
Cell Line ◽  
Breast Cancer Cell ◽  
Breast Cancer Cell Line ◽  
Ag Nanoparticles ◽  
Cytotoxic Effect ◽  
Cancer Cell Line ◽  
Uv Visible

Objective: The aim of the present study is to synthesize the silver (Ag) nanoparticle using Aloin with a focus on its antibacterial, antioxidant, and anticancer activity. Methods: The silver nanoparticles were synthesized using Aloin and were determined by UV-Visible spectrum. It was further characterized by scanning electron microscope (SEM), zeta potential, and dynamic light scattering (DLS). The Fourier transform infrared analysis was also carried out for the Aloin. Results: The UV-Visible absorption spectrum of the synthesized silver nanoparticles has shown the absorption peak at 439nm which proves the formation of silver nanoparticles in the solution. The SEM analysis revealed that the Ag nanoparticles were spherical in shape. The IR spectra showed that there are 6 functional groups are present in Aloin extract. The synthesized nanoparticles are found to be highly stable with an average particle size of 130.7nm which was confirmed by zeta potential and DLS analysis. The synthesized nanoparticles had a good antibacterial and antioxidant activity. It shows a very good cytotoxic effect against breast cancer cell line. Conclusion: The present study suggests that the synthesis route is free from the requirements such as high energy, extended preparation time, and special equipments and thus can be used for large-scale synthesis in food industries for food preservation and these Ag nanoparticles can be used for its therapeutic purposes for developing a new drug against cancer.

scholarly journals Green Synthesis of Silver Nanoparticles by UsingZiziphus nummulariaLeaves Aqueous Extract and Their Biological Activities

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Farhat Ali Khan ◽  
Muhammad Zahoor ◽  
Abdul Jalal ◽  
Aziz Ur Rahman
Keyword(s):  
Silver Nanoparticles ◽  
Ag Nanoparticles ◽  
Leaf Extract ◽  
Biological Activities ◽  
Antioxidant Properties ◽  
Antioxidant Property ◽  
Sem Analysis ◽  
Scanning Calorimetry ◽  
Minimum Fungicidal Concentration ◽  
Uv Visible

Silver nanoparticles ofZiziphus nummularialeaves extract were synthesized and were characterized by UV-Visible spectrophotometry, particle size analyzer, X-ray diffraction (XRD), differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FT-IR), SEM, TGA, and EDX. The XRD pattern reveals the FCC structure of Ag nanoparticles. FTIR spectra confirmed the presence of Ag-O bonding. UV-Visible spectroscopy results confirmed the existence of Ag because of the particular peak in the region of 400–430. The SEM analysis confirmed spherical and uniform Ag nanoparticles with diameter ranging from 30 nm to 85 nm. The EDX analysis revealed strong signals in the silver region and confirmed the formation of silver nanoparticles. The antioxidant potential and antifungal and antimicrobial potential of the leaf extract and silver nanoparticles were also determined. The antioxidant property was determined using DPPH assay. The antibacterial, antifungal, and antioxidant properties were better for the silver nanoparticles than the aqueous leaf extract. The minimum inhibitory concentration (MIC), minimum bactericidal (MBC), and minimum fungicidal concentration (MFC) of plant extract and prepared silver nanoparticles were also tested. The hair growth properties of plant extracts and their respective nanoparticles were observed and good results were noted for nanoparticles as compared to the leaf extract.

Sign in / Sign up

Export Citation Format

Share Document