scholarly journals Optimized Synthesis Approaches of Metal Nanoparticles with Antimicrobial Applications

2020 ◽  
Vol 2020 ◽  
pp. 1-14
Author(s):  
Liliana Marinescu ◽  
Denisa Ficai ◽  
Ovidiu Oprea ◽  
Alexandru Marin ◽  
Anton Ficai ◽  
...  
Keyword(s):  
Metal Nanoparticles ◽  
Chemical Reduction ◽  
The Other ◽  
Thermal Method ◽  
Microwave Assisted Synthesis ◽  
Chemical Methods ◽  
Microwave Assisted ◽  
Radiolytic Process ◽  
Reduction Methods ◽  
Biomedical Fields

According to the literature data, metal nanoparticles can be synthesized by various methods but the chemical reduction methods are mostly applied getting more advantageous comparing with the other methods. This work emphasizes also that the combination of synthetized methods could lead to the spectacular results depending on the application. Among the chemical methods, this work analyzed the polyol method, radiolytic process, microemulsion method, solvo-thermal method, microwave-assisted synthesis, and electrochemical synthesis. It also presents the main application of metal nanoparticles in biomedical fields, empathizing on their antimicrobial potential.

scholarly journals Recent Trends in the Microwave-Assisted Synthesis of Metal Oxide Nanoparticles Supported on Carbon Nanotubes and Their Applications

2012 ◽  
Vol 2012 ◽  
pp. 1-15 ◽  
Author(s):  
Sarah C. Motshekga ◽  
Sreejarani K. Pillai ◽  
Suprakas Sinha Ray ◽  
Kalala Jalama ◽  
Rui. W. M. Krause
Keyword(s):  
Carbon Nanotubes ◽  
Metal Oxides ◽  
Chemical Reduction ◽  
Metal Oxide Nanoparticles ◽  
Power Input ◽  
Metal Nanoparticle ◽  
Microwave Assisted Synthesis ◽  
Microwave Assisted ◽  
Coated Metal ◽  
Size And Morphology

The study of coating carbon nanotubes with metal/oxides nanoparticles is now becoming a promising and challenging area of research. To optimize the use of carbon nanotubes in various applications, it is necessary to attach functional groups or other nanostructures to their surface. The combination of the distinctive properties of carbon nanotubes and metal/oxides is expected to be applied in field emission displays, nanoelectronic devices, novel catalysts, and polymer or ceramic reinforcement. The synthesis of these composites is still largely based on conventional techniques, such as wet impregnation followed by chemical reduction of the metal nanoparticle precursors. These techniques based on thermal heating can be time consuming and often lack control of particle size and morphology. Hence, there is interest in microwave technology recently, where using microwaves represents an alternative way of power input into chemical reactions through dielectric heating. This paper covers the synthesis and applications of carbon-nanotube-coated metal/oxides nanoparticles prepared by a microwave-assisted method. The reviewed studies show that the microwave-assisted synthesis of the composites allows processes to be completed within a shorter reaction time with uniform and well-dispersed nanoparticle formation.

Microwave-Assisted Synthesis of Unmodified Gold Nanoparticles for Colorimetric Detection of Dopamine

2017 ◽  
Vol 730 ◽  
pp. 167-171 ◽  
Author(s):  
Ekarat Detsri ◽  
Kanrayasiri Kamhom ◽  
Chatsuda Detsri
Keyword(s):  
Gold Nanoparticles ◽  
Sodium Citrate ◽  
Limit Of Detection ◽  
Signal To Noise Ratio ◽  
Chemical Reduction ◽  
Colorimetric Detection ◽  
Random Coil ◽  
Microwave Assisted Synthesis ◽  
Microwave Assisted ◽  
Transmission Electron

Unmodified gold nanoparticles (AuNPs) have been successfully synthesized by the chemical reduction of tetrachloride gold (III) ions ([AuCl4]-) in the presence of sodium citrate based on the rapid microwave−assisted approach. The diameter of the synthesized nanoparticles was found in the range of 16.50±2.75 nm. The AuNPs were characterized using UV−vis spectrophotometer, zeta potential analyzer and transmission electron microscope (TEM). The sodium citrate protected AuNPs were found to be selective and sensitive for the detection of dopamine. It was based on the aggregation change of the nanoparticles from random coil to hairpin structure upon the addition of dopamine concentration. The red shift of the plasmonic peak wavelength of AuNPs could be used for the detection of dopamine. The response to dopamine allows for a linear range from 10 to 125 mg⋅L-1 (R2 = 0.9804) with a limit of detection (LOD) at a signal to noise ratio of 3 of 12.85±1.38 mg⋅L-1. The colorimetric sensor was evaluated with 98.0−99.9% recovery of added dopamine in urine sample. The proposed sensor was successfully applied to the determination of dopamine in biological samples.

Conventional and microwave-assisted synthesis of hyperbranched and highly branched polylysine towards amphiphilic core–shell nanocontainers for metal nanoparticles

Polymer ◽  
2012 ◽  
Vol 53 (21) ◽  
pp. 4623-4630 ◽  
Author(s):  
Chau Hon Ho ◽  
Matthias Thiel ◽  
Seref Celik ◽  
Erich K. Odermatt ◽  
Ingo Berndt ◽  
...  
Keyword(s):  
Metal Nanoparticles ◽  
Microwave Assisted Synthesis ◽  
Core Shell ◽  
Microwave Assisted

scholarly journals Rapid and Economic Access to Some NSAIDS-Based Bioactive Heterocycles

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
A. V. Chavan ◽  
R. R. Somani ◽  
P. P. Kalantri ◽  
D. T. Makhija
Keyword(s):  
Reaction Time ◽  
Microwave Synthesis ◽  
Microwave Energy ◽  
The Other ◽  
Microwave Assisted Synthesis ◽  
Simple Method ◽  
Short Reaction Time ◽  
Microwave Assisted ◽  
Target Molecules ◽  
Bioactive Heterocycles

The use of microwave energy for the synthesis is considered as one of the alternate strategies. The present work includes the synthesis of some newer 2,5-disubstituted-1,3,4-oxadiazole analogues using both conventional and alternate rapid methods.The conventional method involves the synthesis of the target molecules by using cyclodehydrating agent like POCl3, while the other method consists of using some catalytic reagents like PbO2. Also, the short reaction time provided by microwave synthesis makes it ideal for the reaction. Hence, this project describes an efficient and operationally simple method for the microwave-assisted synthesis of some bioactive heterocycles based on NSAIDs.

Comparison the Rapid Microwave-Assisted Polyol Route and Modified Chemical Reduction Methods to Synthesize the Pt Nanoparticles on the Ti0.7W0.3O2 Support

2018 ◽  
Vol 279 ◽  
pp. 181-186 ◽  
Author(s):  
Hau Quoc Pham ◽  
Tai Thien Huynh ◽  
At Van Nguyen ◽  
Anh Tram Ngoc Mai ◽  
Vi Thuy Thi Phan ◽  
...  
Keyword(s):  
Ethylene Glycol ◽  
Chemical Reduction ◽  
Pt Nanoparticles ◽  
Face Centered Cubic ◽  
One Pot ◽  
Microwave Assisted ◽  
The Face ◽  
Reduction Methods ◽  
Face Centered ◽  
The One

The tungsten-modified titanium dioxide, which prepared through the one-pot solvothermal process, exhibited the large specific surface area (~ 202 m2/g) and greater electrical conductivity (~ 0.022 S/cm). Furthermore, for the comparison purpose to find appropriate approach for the synthesis 20 wt. % Pt NPs/Ti0.7W0.3O2 catalyst, the modified chemical reduction utilizing NaBH4 and the rapid microwave-assisted polyol using ethylene glycol were employed without any surfactants or stabilizers. The characterization of Pt-based electrocatalyst was investigated through XRD, SEM-EDX, TEM measurements. As result, the platinum nanocatalyst formation with the face-centered cubic structure (fcc) and the amount loading on Ti0.7W0.3O2 support approximately 20 wt. % of two synthesized methods. However, the diameter size and distribution of Pt nanoforms have clearly classified in two reduction route. For example, the Pt nanocatalyst, which was created by the rapid microwave-assisted polyol at 160 °C for 2 min, exhibited the good distribution on support with ~3 nm diameter. This could be ascribed to the fast and uniform heating of microwave-assisted and moderate reducing possibility of ethylene glycol. These results indicate that the rapid microwave-assisted polyol was an appropriate approach not only for synthesizing 20 wt. % Pt NPs/Ti0.7W0.3O2 catalyst but also for preparing Pt-based electrocatalysts.

Effect of Noble Metal Nanoparticles in SERRS Measurements of Water-Soluble Porphyrins

2015 ◽  
Vol 1088 ◽  
pp. 43-47
Author(s):  
Pavlína Andrýsková ◽  
Karolína Machalová Šišková ◽  
Ariana Fargašová ◽  
Radek Zbořil
Keyword(s):  
Metal Nanoparticles ◽  
Noble Metal ◽  
Ag Nanoparticles ◽  
Chemical Reduction ◽  
Resonance Raman Spectroscopy ◽  
Water Soluble ◽  
Noble Metal Nanoparticles ◽  
Surface Enhanced ◽  
Reduction Methods ◽  
Insight Into

Use of the noble metal nanoparticles in the surface-enhanced resonance Raman spectroscopy (SERRS) is a significant part the measurement. These nanoparticles are often used for SERRS measurements of silver nanoparticles prepared by reduction methods. From the literature it is obvious that the most popular methods of preparation of Ag nanoparticles are procedures which are using the chemical reduction and/or laser ablation. In this paper we discuss the comparison of SERRS spectra of water-soluble porphyrins (TTMAPP and TMPyP) in systems with Ag nanoparticles prepared by chemical reduction with sodium borohydride, sodium citrate and glucose. The comparison of different systems gives insight into the option of suitableility of using of nanoparticles with various surface ions in the production of different spectral forms of chosen porphyrins in dependence on their structures.

scholarly journals Microwave-Assisted Synthesis of Pd Nanoparticles and Catalysis Application for Suzuki Coupling Reactions

2017 ◽  
Vol 11 (1) ◽  
pp. 1-8 ◽  
Author(s):  
Jian Zhang ◽  
Xuefeng Bai
Keyword(s):  
Chemical Reduction ◽  
Phenylboronic Acid ◽  
Suzuki Coupling ◽  
Pd Nanoparticles ◽  
Xrd Analysis ◽  
Microwave Assisted Synthesis ◽  
Coupling Reactions ◽  
Microwave Assisted ◽  
Highly Active ◽  
Aryl Bromides

A facile and efficient method was developed for the synthesis of highly active palladium nanoparticles (PdNPs) by microwave-assisted chemical reduction. The PdNPs with different morphology were prepared with or without KBr (capping agent) using ethylene glycol (EG) and citric acid (CA) as reducing agent in the presence of polyvinylpyrrolidone (PVP), respectively. The as-prepared PdNPs were characterized by (UV-Visible Spectrophotometer) UV-Vis, transmission electron microscopy (TEM) and X-ray diffraction (XRD) analysis. The results showed that the PdNPs reduced by EG without KBr (PdNPs-EG) has smaller particle size than other PdNPs. The remarkable catalytic activity of the PdNPs catalysts are obtained using a low amount of PdNPs (0.1 mmol‰) using K2CO3 as base and EtOH/H2O as solvent toward Suzuki coupling reactions of aryl bromides and phenylboronic acid for 15 min.

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