Synthesis of Urethane Base Composite Materials with Metallic Nanoparticles

2013 ◽  
Vol 1547 ◽  
pp. 141-147 ◽  
Author(s):  
Anayansi Estrada Monje ◽  
J. Roberto Herrera Reséndiz
Keyword(s):  
Silver Nanoparticles ◽  
Surface Morphology ◽  
Metallic Nanoparticles ◽  
Antimicrobial Properties ◽  
Polyurethane Foams ◽  
Polymer Materials ◽  
Antifungal Properties ◽  
Base Composite ◽  
Average Size ◽  
20 Nm

ABSTRACTThe antimicrobial properties of polymer materials are used in a verity of applications. Silver nanoparticles are commonly applied to polyurethane foams to obtain antifungal properties. For this study a series of nanocomposites (PU–Ag) from a urethane-type polymer (PU) were reinforced with various amounts of silver nanoparticles having an average size of 20 nm. The surface morphology and antifungal capacity of the nanocomposites were evaluated. As a result, a different surface morphology from PU was found in PU–Ag nanocomposites. The latter nanocomposite showed enhanced thermal and mechanical properties, when compared with the PU without silver nanoaprticles. The nanocomposite also exhibited good antifungal properties that can be used in a variety of applications.

scholarly journals A fast and simple protocol for synthesizing effective antimicrobial silver nanoparticles in non-specialized facilities

2019 ◽  
Author(s):  
Roberto Vazquez-Munoz ◽  
M. Josefina Arellano-Jimenez ◽  
Jose L. Lopez-Ribot
Keyword(s):  
Silver Nanoparticles ◽  
Metallic Nanoparticles ◽  
Chemical Reduction ◽  
Nitrate Solution ◽  
Synthesis Method ◽  
Antimicrobial Properties ◽  
Reduction Process ◽  
Cost Effective ◽  
Silver Nitrate Solution ◽  
Average Size

Abstract Objective Silver nanoparticles (AgNPs) can be difficult or expensive to obtain or synthesize for laboratories in resource-limited facilities. The purpose of this work was to create a fast, facile, and cost-effective method for synthesizing AgNPs with potent antimicrobial properties, that can be readily implemented in non-specialized laboratories.Results Our developed method uses a rather simple and rapid chemical reduction process that involves the addition of a polyvinylpyrrolidone solution to a warmed silver nitrate solution under constant vigorous stirring, immediately followed by the addition of sodium borohydride with constant stirring for an additional 15 minutes. AgNPs had an aspect ratio close to 1, with an average size of 6.18 ± 5 nm. AgNPs displayed potent antimicrobial activity, with Minimal Inhibitory Concentration values of 3 µg mL-1 and 1.5 µg mL-1 for Staphylococcus aureus and Candida albicans respectively.Keywords : Silver nanoparticles, nanoantibiotics, synthesis method, AgNPs, metallic nanoparticles

scholarly journals Synthesis and Photonics Applications of Afzelechin Conjugated Silver Nanoparticles

Coatings ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1295
Author(s):  
Shahid Ali ◽  
Muhammad Rahim ◽  
Perveen Fazil ◽  
Malik Shoaib Ahmad ◽  
Azeem Ullah ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Band Gap ◽  
Band Gap Energy ◽  
Visible Absorption ◽  
Force Microscopy ◽  
Atomic Force ◽  
Uv Visible ◽  
Size And Morphology ◽  
Average Size ◽  
20 Nm

The silver nanoparticles were synthesized, functionalized with afzelechin and characterized using UV-Visible spectroscopy. A difference of 20 nm was observed in surface plasmon resonance of bare and functionalized silver nanoparticles which indicates afzelechin conjugation with silver nanoparticles. The atomic force microscopy (AFM) technique was used for the determination of the size and morphology of synthesized silver nanoparticles. The afzelechin conjugated silver nanoparticles were spherical and their sizes ranged from 3 to 10 nm with an average size of 8 nm while the bare silver nanoparticles were also spherical and their sizes ranged from 3 to 10 nm with an average size of 6 nm. The average sizes were also calculated by fitting their UV-Visible absorption spectra. Fitting is based on the Mie and Mie Gans models, which deduced that afzelechin conjugated silver nanoparticles were 96.5% spherical and 3.5% spheroidal with an average size of 5 nm while bare silver nanoparticles were 100% spherical with an average size of 4 nm. Both the fitting model as well as the AFM results showed a difference of 3 nm between the sizes of afzelechin conjugated silver nanoparticles while 2 nm differences was observed for bare silver nanoparticles. The band gap energy of afzelechin conjugated silver nanoparticles and bare silver nanoparticles were calculated via Tauc’s equation and were found to be 5.1 eV and 5.4 eV, respectively. A difference of 0.3 eV was observed in band gap energies of afzelechin conjugated silver nanoparticles and bare silver nanoparticles.

Encapsulation of Silver Nanoparticles in Polylactic Acid or Poly(lactic-co-glycolic acid) and Their Antimicrobial and Cytotoxic Activities

2019 ◽  
Vol 19 (11) ◽  
pp. 6933-6941
Author(s):  
Daissy Julieth Paredes Guerrero ◽  
Jhon Jhamilton Artunduaga Bonilla ◽  
Claudia Cristina Ortiz López ◽  
Rodrigo Gonzalo Torres Sáez
Keyword(s):  
Silver Nanoparticles ◽  
Mammalian Cells ◽  
Metallic Nanoparticles ◽  
Pathogenic Bacteria ◽  
Polymeric Nanoparticles ◽  
Candida Guilliermondii ◽  
Cytotoxic Activities ◽  
Polymeric Nanocomposites ◽  
Murine Fibroblast ◽  
Average Size

Encapsulation with biodegradable polymers is an alternative to reduce adverse effects and improve the physicochemical properties of metallic nanoparticles. In this study, spherical polymeric nanoparticles with an average size of 200 nm loaded with silver nanoparticles (AgNPs) were obtained. The antimicrobial activity against Escherichia coli O157:H7, methicillin-resistant Staphylococcus aureus (MRSA), and yeasts as Candida albicans, Candida parapsilosis and Candida guilliermondii was determined. MIC90 values of nanocomposites were between 0.01 to 1 μg/mL, potentialized effect up to 500 times compared to free AgNPs. In addition, cytotoxic effect on 50% of murine fibroblast (CC50) was obtained at a mean concentration of 9.57 μg/mL of AgNPs (up to ~1000 times higher than MIC90). Consequently, the polymeric nanocomposites loaded with AgNPs are a potential alternative in the development of new biocide agents on Candida species and pathogenic bacteria at non-toxic concentrations for mammalian cells such as murine fibroblasts.

Preparation of Colloidal Silver Nanoparticles by Laser Ablation; Evaluation and Study on its Developed Applications

2012 ◽  
Vol 488-489 ◽  
pp. 1409-1413
Author(s):  
Adeleh Granmayeh Rad ◽  
Hamed Abbasi
Keyword(s):  
Silver Nanoparticles ◽  
Laser Ablation ◽  
Colloidal Silver ◽  
Laser Ablation Method ◽  
Colloidal Silver Nanoparticles ◽  
Novel Approach ◽  
Transmission Electron ◽  
Good Potential ◽  
Average Size ◽  
20 Nm

In this work we report the preparation of colloidal silver nanoparticles. In order to prepare the silver nanoparticles laser ablation method has been used.A silver coin as a target (purity 99.9 %) was ablated by a Q-Switched Nd:YAG laser with a fluence of about 91 mJ/cm2 at a repetition rate of 10 Hz at room temperature. In order to evaluate these particles transmission electron microscopy (TEM) and spectrophotometry (from UV to NIR) have been used. The average size of prepared nanoparticles is ~ 20 nm. The importance of morphology of nanoparticles has been investigated. Developed applications of silver nanoparticles have been studied,silver nanoparticles are considered as biocompatible and low in toxicity and have good potential for biological applications. Lately silver nanoparticles have found a novel approach in different fields of medicine, biology and industry.

Synthesis and Characterization of TTAB Coated Silver (Ag) Nanoparticles

2011 ◽  
Vol 264-265 ◽  
pp. 530-534
Author(s):  
M.M. Alam ◽  
M. Harun ◽  
Momtazul Islam
Keyword(s):  
Silver Nanoparticles ◽  
Ag Nanoparticles ◽  
Silver Clusters ◽  
Ammonium Bromide ◽  
X Ray Diffraction ◽  
Preferential Growth ◽  
X Ray ◽  
Average Size ◽  
20 Nm

Silver nanoparticles protected by Tetradecyltrimethyl Ammonium Bromide (TTAB) were prepared in a one-phase electrochemical system. Electrochemical procedure, based on the dissolution of a metallic anode in an appropriate solvent, has been used to get silver nanoparticles. It is possible to get different particle size by changing the current density. The optical properties of the silver Nanoparticles were investigated by UV-Vis and Photoluminescence (PL) Spectroscopy. Absorption peak were found 424 nm which confirm the presence of Ag nanoparticles. The structural properties of the samples were carried out by scanning electron microscopy (SEM) and X-ray diffraction (XRD) measurements. XRD confirmed the preferential growth of Ag nanoparticles whose average size is ≈ 20 nm in the <111> orientation as well as purity of silver clusters.

scholarly journals Synthesis of Silver Nanoparticles Using Dichloromethane Extract of Chrysanthemum cinerariaefolium and Its Bioactivity

2021 ◽  
Vol 6 (1) ◽  
pp. 1-17
Author(s):  
Caroline Jepchirchir Kosgei ◽  
Meshack Amos Obonyo ◽  
Josphat Clement Matasyoh ◽  
James J. Owuor ◽  
Moses A. Ollengo ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Silver Nanoparticles ◽  
Metallic Nanoparticles ◽  
Colour Change ◽  
Vero Cells ◽  
Ag Nps ◽  
Absorption Bands ◽  
Sem Images ◽  
Average Size ◽  
Chrysanthemum Cinerariaefolium

Common methods of synthesizing metallic nanoparticles are chemical and physical. However, they are expensive and use toxic chemicals. Green synthesis is less costly and safer hence a potential alternative. Silver nanoparticles (Ag NPs) were synthesized using dichloromethane extract of Chrysanthemum cinerariaefolium and colour change from pale green to dark brown was observed. Scanning Electron Microscopy (SEM) images were faceted and others formed clusters. Transmission Electron Microscopy (TEM) images were spherical with an average size of 22.8± 17.5 nm. EDX analysis showed the nanoparticles had percentage abundance of 67.26%. Fourier-transform Infrared Spectroscopy (FTIR) analysis showed absorption bands at 3489.59 cm-1, 3217.80 cm-1, 2384.74 cm-1 , 1633.05 cm-1, 1405.08 cm-1, 1109.32 cm-1 and 505.93 cm-1. The UV-Vis analysis showed Surface Plasmon Resonance (SPR) peak at 434 nm. The nanoparticles were more active on P. aeruginosa with an MIC of 15 µg/ml while the cytotoxicity assay showed Ag NPs had an MIC of 33.33 µg/ml hence were noncytotoxic against Vero cells.

Biosynthesis of Silver Nanoparticles Using Plant Extract and its Anti-Plasmodial Property

2015 ◽  
Vol 1086 ◽  
pp. 11-30 ◽  
Author(s):  
Chellasamy Panneerselvam ◽  
Kadarkarai Murugan ◽  
Duraisamy Amerasan
Keyword(s):  
Silver Nanoparticles ◽  
Aqueous Extract ◽  
Plant Extract ◽  
Metallic Nanoparticles ◽  
Antimicrobial Properties ◽  
Nanoparticle Synthesis ◽  
Silver Ions ◽  
Antiplasmodial Activity ◽  
X Ray ◽  
Scanning Electron

Metallic nanoparticles have received great attention from chemists, physicists, biologists and engineers who wish to use them for the development of a new generation of nanodevices. In the present Communication, a completely “green” chemistry method for producing silver nanoparticles is introduced. The process is simple, environmentally benign, and quite efficient. Green nanoparticle synthesis has been achieved using environmentally acceptable plant extract and ecofriendly reducing and capping agents. In particular, silver nanoparticles are proved to have potential antibacterial, antifungal and antiplasmodial and antimicrobial properties. The present study was aimed to identify the antiplasmodial activity of green synthesised silver nanoparticles (AgNPs) using aqueous extract of plantEuphorbia hirtaagainstP.falciparum. Nanoparticles are being used in many commercial applications. It was found that aqueous silver ions can be reduced by aqueous extract of plant to generate extremely stable silver nanoparticles in water. The bio-reduced silver nanoparticles were appropriately characterized by UV–vis spectrum, Scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD). The formation of the AgNPs synthesized from the XRD spectrum compared with the standard confirmed spectrum of silver particles formed in the present experiments were in the form of nanocrystals, as evidenced by the peaks at 2θ values of =28.01°, 32.41°, 46.44°, 55.05° and 57.75°. The scanning electron micrograph (SEM) showed structures of spherical, cubic shape, and the size range was found to be 30–60 nm. The EDX spectra showed the purity of the material and the complete chemical composition of the synthesized AgNPs. The parasitic inhibition was dose-dependent. The synthesized AgNPs showed considerable antiplasmodial activity than the crude methanol and aqueous leaf extract ofE.hirta. The maximum efficacy was

Green Synthesis of Silver Nanoparticles Using Prunus Amygdalus Extract and their Anti-Microbial Activity

2015 ◽  
Vol 1119 ◽  
pp. 165-169
Author(s):  
S.K. Srikar ◽  
D.D. Giri ◽  
C. Upadhyay ◽  
P.K. Mishra ◽  
S.N. Upadhyay
Keyword(s):  
Silver Nanoparticles ◽  
Silver Nitrate ◽  
Single Step ◽  
Prunus Amygdalus ◽  
E Coli ◽  
Bacteriostatic Property ◽  
Silver Nitrate Concentration ◽  
Average Size ◽  
20 Nm ◽  
Sun Light

Highly stable silver nanoparticles synthesized in single-step green method by mixing silver nitrate and aqueous extract of Almond (Prunus amygdalus). Experiments were conducted to influence the change in the silver nitrate concentration and time on the synthesis of silver nanoparticles at room temperature under dispersed sun light. The almond extract acted both as the reducing and stabilizing agent for the synthesis of silver nanoparticles. The change in the color of the reaction mixture was monitored using UV-Visible spectrometry whereas particles synthesized were characterized using Scanning Electron Microscopy, Dynamic Light Scattering and Fourier Transform Infrared Spectroscopy. The synthesized nanoparticles were almost spherical in shape with an average size about 20 nm and they exhibited bacteriostatic property against E. coli.

Green Synthesis of Silver Nanoparticles Using Two Lichens Species: Parmotrema praesorediosum and Ramalina dumeticola

2012 ◽  
Vol 229-231 ◽  
pp. 256-259 ◽  
Author(s):  
Ropisah Mie ◽  
Mohd Wahid Samsudin ◽  
Laily B. Din ◽  
Azizan Ahmad
Keyword(s):  
Silver Nanoparticles ◽  
Green Synthesis ◽  
Cost Effective ◽  
Green Technology ◽  
Tem Analysis ◽  
Environmental Friendly ◽  
Absorbance Peak ◽  
Average Size ◽  
20 Nm ◽  
First Time

Chemical synthetic method in synthesizing silver nanoparticle was quite expensive, toxic and flammable. In order to enhance green technology, we develop a simple biological method for the green synthesis of silver nanoparticles using two lichens species, Parmotrema praesorediosum and Ramalina dumeticola. Silver nanoparticles were characterized using UV-Vis absorption spectroscopy and TEM. Within 72 hours reaction time, absorption spectra of silver nanoparticles formed in R. dumeticola and P. praesorediosum has absorbance peak at 407 nm and 423 nm, respectively. TEM analysis showed the average size of 20 nm of silver nanoparticles obtained in R. dumeticola and the average size of 42 nm of silver nanoparticles obtained in P. praesorediosum. These two lichens species are able to synthesize silver nanoparticles through green chemistry method, which are environmental friendly and cost effective. This is for the first time that any species of lichens was used for the synthesis of silver nanoparticles.

scholarly journals New Guar Biopolymer Silver Nanocomposites for Wound Healing Applications

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Runa Ghosh Auddy ◽  
Md Farooque Abdullah ◽  
Suvadra Das ◽  
Partha Roy ◽  
Sriparna Datta ◽  
...  
Keyword(s):  
Wound Healing ◽  
Silver Nanoparticles ◽  
Guar Gum ◽  
Antimicrobial Properties ◽  
Treated Group ◽  
Polymer Materials ◽  
Wound Site ◽  
Positive Effects ◽  
And Migration ◽  
Proliferation And Migration

Wound healing is an innate physiological response that helps restore cellular and anatomic continuity of a tissue. Selective biodegradable and biocompatible polymer materials have provided useful scaffolds for wound healing and assisted cellular messaging. In the present study, guar gum, a polymeric galactomannan, was intrinsically modified to a new cationic biopolymer guar gum alkylamine (GGAA) for wound healing applications. Biologically synthesized silver nanoparticles (Agnp) were further impregnated in GGAA for extended evaluations in punch wound models in rodents. SEM studies showed silver nanoparticles well dispersed in the new guar matrix with a particle size of ~18 nm. In wound healing experiments, faster healing and improved cosmetic appearance were observed in the new nanobiomaterial treated group compared to commercially available silver alginate cream. The total protein, DNA, and hydroxyproline contents of the wound tissues were also significantly higher in the treated group as compared with the silver alginate cream (P<0.05). Silver nanoparticles exerted positive effects because of their antimicrobial properties. The nanobiomaterial was observed to promote wound closure by inducing proliferation and migration of the keratinocytes at the wound site. The derivatized guar gum matrix additionally provided a hydrated surface necessary for cell proliferation.

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