Achievements in the Synthesis of Elemental Silver Nanoparticles with Various Geometric Forms

2018 ◽  
Vol 15 (2) ◽  
pp. 112-128
Author(s):  
Oleg V. Mikhailov
Keyword(s):  
Silver Nanoparticles ◽  
Reducing Agents ◽  
Molar Ratio ◽  
Capping Agent ◽  
Elemental Silver ◽  
Methods Of Synthesis ◽  
Physicochemical Methods ◽  
Biological Methods ◽  
Specific Synthesis

Background:The data on the specific synthesis of elemental silver nanoparticles (Ag-NP) having the forms of various geometric bodies (pseudo spherical, prismatic, cubic, trigonal-pyramidal, etc.), obtained by various methods, have been systematized and generalized.Objective:It is noted that the forms and sizes of Ag-NP are greatly dependant on the conditions in which they are formed.Method:Comparison of the data of the characteristics of silver nanoparticles obtained by chemical, physicochemical and biological methods has been made.Results:It has been shown that form and size of produced Ag-NP depend strongly on the such factors as temperature, the concentration of silver(I) containing precursor, pH of the solution, the molar ratio between capping agent and silver(I) containing precursor, reducing agents etc., and, also, on the method used for Ag-NP synthesis (chemical, physicochemical or biological).It has also been noted that biological methods of synthesis of Ag-NP are generally more preferable in comparison with the chemical and physicochemical methods. The review covers mainly publications published in the last 20 years.

Progress in the synthesis of Ag nanoparticles having manifold geometric forms

2018 ◽  
Vol 38 (1) ◽  
pp. 21-42 ◽  
Author(s):  
Oleg V. Mikhailov
Keyword(s):  
Silver Nanoparticles ◽  
21St Century ◽  
Ag Nanoparticles ◽  
Elemental Silver ◽  
Biological Methods ◽  
Specific Synthesis

AbstractThe data on the specific synthesis of elemental silver nanoparticles having the forms of various geometric bodies (pseudo spherical, prismatic, cubic, trigonal-pyramidal, etc.), obtained by various chemical, physicochemical, and biological methods, have been systematized and generalized. This review covers mainly publications published in the current 21st century.

scholarly journals Elemental Silver Nanoparticles: Biosynthesis and Bio Applications

Materials ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3177 ◽  
Author(s):  
Mikhailov ◽  
Mikhailova
Keyword(s):  
Silver Nanoparticles ◽  
21St Century ◽  
Geometric Shapes ◽  
Elemental Silver ◽  
Biological Methods

The data on the specifics of synthesis of elemental silver nanoparticles (Ag-NP) having various geometric shapes (pseudo spherical, prismatic, cubic, trigonal-pyramidal, etc.), obtained by using various biological methods, and their use in biology and medicine have been systematized and generalized. The review covers mainly publications published in the current 21st century. Bibliography: 262 references.

Synthesis and characterization of an antimicrobial textile by hexagon silver nanoparticles with a new capping agent via the polyol process

2019 ◽  
Vol 89 (23-24) ◽  
pp. 5130-5143
Author(s):  
Maedeh Ramezani ◽  
Aljosa Kosak ◽  
Aleksandra Lobnik ◽  
Ajra Hadela
Keyword(s):  
Silver Nanoparticles ◽  
Antimicrobial Properties ◽  
Average Diameter ◽  
Molar Ratio ◽  
Silver Nanostructures ◽  
Capping Agent ◽  
Scanning Calorimetry ◽  
Gram Positive Bacteria ◽  
Transmission Electron ◽  
Antibacterial And Antifungal

In this study, we developed hexagon silver nanoparticles (AgNPs) prepared by the polyol method in ethylene glycol media using aminopropyltrimethoxysilane (APTMS) as a capping agent for the first time. The presence of the primary amine group makes APTMS a great candidate as a capping agent for the synthesis of silver nanostructures, but it has not been used for this purpose until now. The synthesized silver nanostructures were characterized by transmission electron microscopy, Fourier transform infrared spectroscopy, differential scanning calorimetry and ultraviolet-visible spectroscopy. The molar ratio of APTMS to AgNO3 varied from 0.5 to 6.8, which resulted in an average diameter of the obtained nanoparticles from 50 to 100 nm. The optimum morphology of hexagonally shaped AgNPs was obtained at a molar ratio of 2.2. The prepared AgNPs were evaluated for their antibacterial and antifungal properties. Antimicrobial tests showed that a cotton textile coated with colloidal amino functionalized AgNPs has excellent antimicrobial properties as an inhibitor of growth against the gram-positive bacteria Staphylococcus aureus, gram-negative bacteria, Escherichia coli and fungus Candida albicans, and therefore showing potential for real applications.

scholarly journals Biosynthesis of Silver Nanoparticles Mediated by Entomopathogenic Fungi: Antimicrobial Resistance, Nanopesticides, and Toxicity

Antibiotics ◽  
2021 ◽  
Vol 10 (7) ◽  
pp. 852
Author(s):  
Tárcio S. Santos ◽  
Tarcisio M. Silva ◽  
Juliana C. Cardoso ◽  
Ricardo L. C. de Albuquerque-Júnior ◽  
Aleksandra Zielinska ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Filamentous Fungi ◽  
Entomopathogenic Fungi ◽  
Antimicrobial Agents ◽  
Insect Pests ◽  
Insect Control ◽  
Biological Synthesis ◽  
Biological Methods ◽  
Potential Use

Silver nanoparticles are widely used in the biomedical and agri-food fields due to their versatility. The use of biological methods for the synthesis of silver nanoparticles has increased considerably due to their feasibility and high biocompatibility. In general, microorganisms have been widely explored for the production of silver nanoparticles for several applications. The objective of this work was to evaluate the use of entomopathogenic fungi for the biological synthesis of silver nanoparticles, in comparison to the use of other filamentous fungi, and the possibility of using these nanoparticles as antimicrobial agents and for the control of insect pests. In addition, the in vitro methods commonly used to assess the toxicity of these materials are discussed. Several species of filamentous fungi are known to have the ability to form silver nanoparticles, but few studies have been conducted on the potential of entomopathogenic fungi to produce these materials. The investigation of the toxicity of silver nanoparticles is usually carried out in vitro through cytotoxicity/genotoxicity analyses, using well-established methodologies, such as MTT and comet assays, respectively. The use of silver nanoparticles obtained through entomopathogenic fungi against insects is mainly focused on mosquitoes that transmit diseases to humans, with satisfactory results regarding mortality estimates. Entomopathogenic fungi can be employed in the synthesis of silver nanoparticles for potential use in insect control, but there is a need to expand studies on toxicity so to enable their use also in insect control in agriculture.

Size-controlled fabrication of silver nanoparticles using the Hedyotis puberula leaf extract: toxicity on mosquito vectors and impact on biological control agents

RSC Advances ◽  
2016 ◽  
Vol 6 (99) ◽  
pp. 96573-96583 ◽  
Author(s):  
Raja Mohamed Sait Thameem Azarudeen ◽  
Marimuthu Govindarajan ◽  
Abubucker Amsath ◽  
Shine Kadaikunnan ◽  
Naiyf S. Alharbi ◽  
...  
Keyword(s):  
Biological Control ◽  
Silver Nanoparticles ◽  
Leaf Extract ◽  
Low Cost ◽  
Aquatic Organisms ◽  
Capping Agent ◽  
Mosquito Vectors ◽  
Biological Control Agents ◽  
Size Controlled ◽  
Control Tool

As a low-cost and eco-friendly control tool, Ag nanoparticles were fabricated usingHedyotis puberulaaqueous extract as a reducing and capping agent and showed potent activity against malaria and arbovirus vectors with low biotoxicity against non-target aquatic organisms.

scholarly journals Catalytic and anti-bacterial properties of biosynthesized silver nanoparticles using native inulin

RSC Advances ◽  
2018 ◽  
Vol 8 (50) ◽  
pp. 28746-28752 ◽  
Author(s):  
Wei Xu ◽  
Kunling Huang ◽  
Weiping Jin ◽  
Denglin Luo ◽  
Huan Liu ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Capping Agent ◽  
Ag Nps ◽  
Incubation Temperatures

Silver nanoparticles (Ag NPs) were green synthesized using native inulin as the reducing and capping agent with varied incubation temperatures, incubation times and Ag+ concentrations.

Synthesis and Characterization of Silver Nanoparticles from Psidium Guajava Leaf Extract

2021 ◽  
Vol 14 (5) ◽  
pp. 5634-5638
Author(s):  
Sruthi Radhakrishnan
Keyword(s):  
Silver Nanoparticles ◽  
Silver Nanoparticle ◽  
Leaf Extract ◽  
Nanoparticle Synthesis ◽  
Ethanolic Extract ◽  
Psidium Guajava ◽  
Sem Analysis ◽  
Synthesis Of Nanoparticles ◽  
Elemental Silver ◽  
Ft Ir

Green route for the synthesis of nanoparticles has become more acceptable than the other chemical as well as biological route. In the present study, silver nanoparticle is synthesized using ethanolic extract of Psidium guajava leaves. Further the synthesized silver nanoparticles were characterized by UV-Visible Spec, FT-IR, X-Ray Diffraction FESEM and E-DAX. The results of FT-IR provided evidence of the involvement of phytochemicals present in the leaf extract in the reduction of silver nitrate to silver nanoparticles. XRD confirmed the crystalline structure as well as shape of the synthesized nanoparticle as face-centred cubic. E-DAX profiling helped in determining the presence of elemental silver. The size of the nanoparticle procured by SEM analysis was found to be approximately 30-50 nm in size. Thus, the findings of this study showed that the plant assisted method for silver nanoparticle synthesis is more effective and further application level studies can shed lights on their use in healing of various human ailments.   

scholarly journals Synthesis of Silver Nanoparticles from Anagalis arvensis and Their Biomedical Applications

2018 ◽  
Author(s):  
Mohib Shah ◽  
Natasha Anwar ◽  
Samreen Saleem ◽  
Iqbal Munir ◽  
Niaz Ali Shah ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Reducing Power ◽  
Spherical Shape ◽  
Artemia Salina ◽  
Maximum Activity ◽  
Tem Analysis ◽  
Synthesis Of Nanoparticles ◽  
The Stability ◽  
Average Size ◽  
Biological Methods

Background. Nanotechnology is promising field for generating new applications. A green synthesis of nanoparticles through biological methods using plant extract have a reliable and ecofriendly approach to improve our global environment. Methods. Silver nanoparticles (AgNPs) were synthesized using aqueous extract of Anagalis arvensis L and silver nitrate and were physicochemically characterized. Results. The stability of AgNPs toward acidity, alkalinity, salinity and temperature showed that they remained stable at room temperature for more than two months. The SEM and TEM analysis of the AgNPs showed that they have a uniform spherical shape with an average size in the range of 40–78 nm. Further 1-Dibhenyl-2-Picrylhydrazl radical in Anagalis arvensis L.mediated AgNPs showed a maximum activity of 98% at concentration of 200μg/mL. Hydrogen peroxide scavenging assay in Anagalis arvensis L. mediated AgNPs showed a maximum activity of 85% at concentration of 200μg/mL. Reducing power of Anagalis arvensis L.Ag NPs exhibited a higher activity of 330 μg/mL at concentration of 200 μg/mL. These NPs have cytotoxic effects against brine shrimp (Artemia salina) nauplii with a value of 53% LD 178.04μg/mL. Conclusion. The AgNPs synthesized using Anagalis arvensis L. extract demonstrate a broad range of applications.

Synthesis of Uniform and High Density Silver Nanoparticles by using Peltophorum pterocarpum flower Extract

2014 ◽  
Vol 1584 ◽  
Author(s):  
Matheswaran BALAMURUGAN ◽  
Shanmugam SARAVANAN ◽  
Naoki OHTANI
Keyword(s):  
Silver Nanoparticles ◽  
Fourier Transform ◽  
Electron Microscope ◽  
Ultra Violet ◽  
Capping Agent ◽  
Nanosized Particles ◽  
Flower Extract ◽  
Transmission Electron ◽  
Vis Spectroscopy ◽  
Ft Ir

ABSTRACTSilver nanoparticle (AgNP) is one of the elegant material because its uses in various fields. In this study, AgNPs have been prepared by using Peltophorum pterocarpum (PP) flower extract as reducing and capping agent and aqueous silver nitrate (aq.AgNO3) as silver precursor. The synthesized nanoparticles were characterized using Ultra Violet - Visible (UV-Vis) spectroscopy, High Resolution Transmission Electron Microscope (HR-TEM) and Fourier Transform Infrared Spectroscopy (FT-IR), which reveals the formation of nanosized particles. The UV-Vis spectrum shows an absorption peak around 430nm. HR-TEM images of AgNPs with clear morphology and well dispersed prepared AgNPs.

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