scholarly journals Green Formation of Spherical and Dendritic Silver Nanostructures under Microwave Irradiation without Reducing Agent

2012 ◽  
Vol 13 (7) ◽  
pp. 8086-8096 ◽  
Author(s):  
Monir Noroozi ◽  
Azmi Zakaria ◽  
Mohd Maarof Moksin ◽  
Zaidan Abd Wahab ◽  
Alam Abedini
Keyword(s):  
Microwave Irradiation ◽  
Reducing Agent ◽  
Silver Nanostructures

scholarly journals Durable Antimicrobial Behaviour from Silver-Graphene Coated Medical Textile Composites

Polymers ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 2000 ◽  
Author(s):  
Nuruzzaman Noor ◽  
Suhas Mutalik ◽  
Muhammad Waseem Younas ◽  
Cheuk Ying Chan ◽  
Suman Thakur ◽  
...  
Keyword(s):  
Soft Matter ◽  
Optical Emission ◽  
Textile Composites ◽  
Reducing Agent ◽  
Metallic Silver ◽  
Silver Nanostructures ◽  
Ion Release ◽  
Electron Microscopic ◽  
Host Matrix ◽  
X Ray

Silver nanoparticle (AgNP) and AgNP/reduced graphene oxide (rGO) nanocomposite impregnated medical grade polyviscose textile pads were formed using a facile, surface-mediated wet chemical solution-dipping process, without further annealing. Surfaces were sequentially treated in situ with a sodium borohydride (NaBH4) reducing agent, prior to formation, deposition, and fixation of Ag nanostructures and/or rGO nanosheets throughout porous non-woven (i.e., randomly interwoven) fibrous scaffolds. There was no need for stabilising agent use. The surface morphology of the treated fabrics and the reaction mechanism were characterised by Fourier transform infrared (FTIR) spectra, ultraviolet-visible (UV–Vis) absorption spectra, X-ray diffraction (XRD), Raman spectroscopy, dynamic light scattering (DLS) energy-dispersive X-ray analysis (EDS), and scanning electron microscopic (SEM). XRD and EDS confirmed the presence of pure-phase metallic silver. Variation of reducing agent concentration allowed control over characteristic plasmon absorption of AgNP while SEM imaging, EDS, and DLS confirmed the presence of and dispersion of Ag particles, with smaller agglomerates existing with concurrent rGO use, which also coincided with enhanced AgNP loading. The composites demonstrated potent antimicrobial activity against the clinically relevant gram-negative Escherichia coli (a key causative bacterial agent of healthcare-associated infections; HAIs). The best antibacterial rate achieved for treated substrates was 100% with only a slight decrease (to 90.1%) after 12 equivalent laundering cycles of standard washing. Investigation of silver ion release behaviours through inductively coupled plasmon optical emission spectroscopy (ICP-OES) and laundering durability tests showed that AgNP adhesion was aided by the presence of the rGO host matrix allowing for robust immobilisation of silver nanostructures with relatively high stability, which offered a rapid, convenient, scalable route to conformal NP–decorated and nanocomposite soft matter coatings.

scholarly journals Artificial Sweeteners and Sugar Ingredients as Reducing Agent for Green Synthesis of Silver Nanoparticles

2019 ◽  
Vol 2019 ◽  
pp. 1-16 ◽  
Author(s):  
Shohreh Hemmati ◽  
Erin Retzlaff-Roberts ◽  
Corren Scott ◽  
Michael T. Harris
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Green Synthesis ◽  
Reducing Agents ◽  
Reducing Agent ◽  
Artificial Sweeteners ◽  
Silver Nanostructures ◽  
Artificial Sweetener ◽  
Transmission Electron ◽  
Vis Spectroscopy

An environmentally friendly technique has been developed to produce metal nanoparticles using green synthesis methods. In this study, silver nanostructures were synthesized using different sugar substitutes and artificial sweeteners as green reducing agents in an aqueous solution at low temperature. The main ingredients (such as maltodextrin, sucrose, saccharin, and sucralose) of the artificial sweeteners acting as reducing agents were used to reduce Ag+ ions to Ag0. The pH of the solution was controlled during synthesis through the addition of sodium hydroxide (NaOH) to increase the strength of the reducing agents by converting nonreducing sugars to reducing ones and consequently increasing the rate of silver nanoparticle formation. The size and morphology of the synthesized nanostructures were characterized by transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDX). The formation of nanostructures during the course of the reactions was investigated by UV-visible (UV-vis) spectroscopy characterization of an aliquot of sample at specific intervals. The function of each artificial sweetener and corresponding ingredients as a reducing agent and capping agent was investigated by Fourier-transform infrared spectroscopy (FTIR) and mass spectrometry (MS).

Shape-controlled synthesis of palladium nanocrystals by microwave irradiation

2009 ◽  
Vol 81 (12) ◽  
pp. 2377-2385 ◽  
Author(s):  
Yanchun Yu ◽  
Yanxi Zhao ◽  
Tao Huang ◽  
Hanfan Liu
Keyword(s):  
Microwave Irradiation ◽  
Microwave Heating ◽  
Reducing Agent ◽  
Tetraethylene Glycol ◽  
Controlled Synthesis ◽  
Shape Controlled

The controlled synthesis of Pd icosahedra in tetraethylene glycol (TEG) with H2PdCl4 as a precursor and poly(vinylpyrrolidone) (PVP) as a stabilizer in the presence of an appropriate amount of KOH under microwave irradiation was demonstrated. TEG served as both solvent and reducing agent, and stable Pd icosahedra with uniform sizes and well-defined shapes could be prepared in a yield of over 90 % by microwave heating for 60 s. The sizes of Pd icosahedra can be well controlled by adjusting the concentration of the precursor H2PdCl4.

scholarly journals Microwave-assisted synthesis of mutually embedded Rh concave nanocubes with enhanced electrocatalytic activity

RSC Advances ◽  
2019 ◽  
Vol 9 (33) ◽  
pp. 19126-19130
Author(s):  
Junxuan Xu ◽  
Hongbin Tang ◽  
Baogui Ning ◽  
Yanxi Zhao ◽  
Tao Huang
Keyword(s):  
Microwave Irradiation ◽  
Electrocatalytic Activity ◽  
Reducing Agent ◽  
Tetraethylene Glycol ◽  
Microwave Assisted Synthesis ◽  
Microwave Assisted

Mutually embedded Rh concave nanocubes were synthesized by reducing Rh(acac)3 with tetraethylene glycol (TEG) as both a solvent and a reducing agent under microwave irradiation for 120 s.

On the Polyol Synthesis of Silver Nanostructures: Glycolaldehyde as a Reducing Agent

Nano Letters ◽  
2008 ◽  
Vol 8 (7) ◽  
pp. 2077-2081 ◽  
Author(s):  
Sara E. Skrabalak ◽  
Benjamin J. Wiley ◽  
Munho Kim ◽  
Eric V. Formo ◽  
Younan Xia
Keyword(s):  
Reducing Agent ◽  
Polyol Synthesis ◽  
Silver Nanostructures

One-pot synthesis of benzazoles and quinazolinones via iron pentacarbonyl mediated carbonylation of aryl iodides under microwave irradiation

2017 ◽  
Vol 4 (3) ◽  
pp. 392-397 ◽  
Author(s):  
Wun-Huei Lin ◽  
Wen-Chun Wu ◽  
Manikandan Selvaraju ◽  
Chung-Ming Sun
Keyword(s):  
Carbon Monoxide ◽  
Microwave Irradiation ◽  
Iron Pentacarbonyl ◽  
Reducing Agent ◽  
Solid Carbon ◽  
One Pot ◽  
One Pot Synthesis ◽  
Aryl Iodides ◽  
Unconventional Method

A direct and unconventional method for the synthesis of benzazoles and quinazolinones is discovered by using iron pentacarbonyl as a reducing agent and a solid carbon monoxide source under microwave irradiation.

scholarly journals Free Reducing Agent, One Pot, and Two Steps Synthesis of Ag@SiO2 Core-shells using Microwave Irradiation

2016 ◽  
Vol 8 (3) ◽  
pp. 03020-1-03020-4
Author(s):  
M. Karimipour ◽  
◽  
S. Mostoufirad ◽  
M. Molaei ◽  
H. Rezvani Nikabadi ◽  
...  
Keyword(s):  
Microwave Irradiation ◽  
Reducing Agent ◽  
One Pot

scholarly journals Synthesis of silver nanostructures in ionic liquid media and their application to photodegradation of methyl orange

2019 ◽  
Vol 9 ◽  
pp. 184798041983650 ◽  
Author(s):  
Hyesu Park ◽  
Shamim Ahmed Hira ◽  
Nallal Muthuchamy ◽  
Sungkyun Park ◽  
Kang Hyun Park
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Ionic Liquid ◽  
Methyl Orange ◽  
Reducing Agent ◽  
Silver Nanostructures ◽  
Liquid Media ◽  
X Ray ◽  
Silver Nps ◽  
Scanning Electron

Silver nanostructures (silver nanopaerticles e.g AgNPs and silver nanoplates e.g AgNPls) of various sizes and shapes were prepared using different reducing agents in ionic liquid media. The ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate, which acts both as a cosolvent and a surfactant, was used to synthesize smaller and more ordered silver nanostructures. Spherical nanoparticles (silver NPs) were prepared using sodium borohydride as a reducing agent. On the other hand, plate-shaped silver nanostructures (silver NPls) were prepared using hydrazine hydrate as a reducing agent. The as-synthesized silver nanostructures were characterized by scanning electron microscopy, powder X-ray diffraction, field-emission scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, ultraviolet–visible spectroscopy, and Brunauer–Emmett–Teller analysis. The resulting materials were applied for the photodegradation of methyl orange under visible light irradiation. Because of their large surface area, the silver NPs showed better photocatalytic activity compared with that of Ag NPls.

Visible light promoted porphyrin-based metal-organic adduct

2020 ◽  
Vol 24 (05n07) ◽  
pp. 758-764
Author(s):  
Rosanna Pagano ◽  
Michela Ottolini ◽  
Fabio Marzo ◽  
Nicola Lovergine ◽  
Simona Bettini ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Visible Light ◽  
Reducing Agent ◽  
Water Soluble ◽  
Hybrid Nanostructures ◽  
Plasmonic Nanostructures ◽  
Light Illumination ◽  
Silver Nanostructures ◽  
Aggregation State ◽  
Porphyrin Derivative

Supramolecular adducts formed by a commercial porphyrin derivative and silver nanoparticles have been obtained using exclusively light as an external trigger that is able to promote the formation of the plasmonic nanostructures. In particular, a water-soluble porphyrin, i.e. tetrakis(4-carboxyphenyl)porphyrin, has been used. It has been thoroughly characterized by means of UV-vis and fluorescence spectroscopy in order to explain its peculiar behavior when illumined with visible photons. Herein we demonstrate that, by means of light illumination, it is possible to tune the porphyrin aggregation state. Furthermore, when the monomeric form of the organic macrocycle is induced and a controlled amount of AgNO[Formula: see text] is simultaneously dissolved, it is possible to promote the formation of silver nanostructures using visible light. The proposed approach allowed porphyrin derivatives/Ag nanoparticles hybrid nanostructures to be obtained without using a chemical reducing agent: the porphyrin derivative simultaneously acts as reducing agent when irradiated by visible light and as a capping agent for the silver nanostructures. The organic/inorganic adduct was characterized by means of steady-state fluorescence that highlights a strong energetic or electronic communication between the two species. XRD and SEM investigations evidence that silver nanoparticles are formed without using any reducing agent.

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