Easy Access to Metallic Copper Nanoparticles with High Activity and Stability for CO Oxidation

2015 ◽  
Vol 7 (15) ◽  
pp. 7987-7994 ◽  
Author(s):  
Renato V. Gonçalves ◽  
Robert Wojcieszak ◽  
Heberton Wender ◽  
Carlos Sato B. Dias ◽  
Lucas L. R. Vono ◽  
...  
Keyword(s):  
Co Oxidation ◽  
High Activity ◽  
Copper Nanoparticles ◽  
Metallic Copper ◽  
Easy Access

scholarly journals New Hybrid Copper Nanoparticles/Conjugated Polyelectrolyte Composite with Antibacterial Activity

Polymers ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 401
Author(s):  
Ignacio A. Jessop ◽  
Yasmín P. Pérez ◽  
Andrea Jachura ◽  
Hipólito Nuñez ◽  
Cesar Saldías ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Copper Nanoparticles ◽  
Salmonella Enteritidis ◽  
Theoretical Calculations ◽  
Chemical Reduction ◽  
Metallic Copper ◽  
Resistant Bacteria ◽  
Small Contribution ◽  
Antibiotic Resistant ◽  
Conjugated Polyelectrolyte

In the search for new materials to fight against antibiotic-resistant bacteria, a hybrid composite from metallic copper nanoparticles (CuNPs) and a novel cationic π-conjugated polyelectrolyte (CPE) were designed, synthesized, and characterized. The CuNPs were prepared by chemical reduction in the presence of CPE, which acts as a stabilizing agent. Spectroscopic analysis and electron microscopy showed the distinctive band of the metallic CuNP surface plasmon and their random distribution on the CPE laminar surface, respectively. Theoretical calculations on CuNP/CPE deposits suggest that the interaction between both materials occurs through polyelectrolyte side chains, with a small contribution of its backbone electron density. The CuNP/CPE composite showed antibacterial activity against Gram-positive (Staphylococcus aureus and Enterococcus faecalis) and Gram-negative (Escherichia coli and Salmonella enteritidis) bacteria, mainly attributed to the CuNPs’ effect and, to a lesser extent, to the cationic CPE.

ChemInform Abstract: Synthesis, Characterization, and Properties of Metallic Copper Nanoparticles.

ChemInform ◽  
2010 ◽  
Vol 29 (32) ◽  
pp. no-no
Author(s):  
N. A. DHAS ◽  
C. P. RAJ ◽  
A. GEDANKEN
Keyword(s):  
Copper Nanoparticles ◽  
Metallic Copper

Nonlinear Optical Properties of Tungsten Lead–Pyrophosphate Glasses Containing Metallic Copper Nanoparticles

Plasmonics ◽  
2013 ◽  
Vol 8 (4) ◽  
pp. 1667-1674 ◽  
Author(s):  
Danilo Manzani ◽  
Juliana M. P. Almeida ◽  
Mariana Napoli ◽  
Leonardo De Boni ◽  
Marcelo Nalin ◽  
...  
Keyword(s):  
Optical Properties ◽  
Copper Nanoparticles ◽  
Nonlinear Optical ◽  
Metallic Copper ◽  
Nonlinear Optical Properties ◽  
Tungsten Lead ◽  
Lead Pyrophosphate

Single Pd atomic catalyst on Mo2CO2 monolayer (MXene): unusual activity for CO oxidation by trimolecular Eley–Rideal mechanism

2018 ◽  
Vol 20 (5) ◽  
pp. 3504-3513 ◽  
Author(s):  
Cheng Cheng ◽  
Xilin Zhang ◽  
Mingyang Wang ◽  
Shiyan Wang ◽  
Zongxian Yang
Keyword(s):  
Co Oxidation ◽  
High Activity ◽  
Excellent Stability

A Pd atom Mo2CO2 exhibits excellent stability and high activity to CO oxidation.

scholarly journals Green Synthesis of Encapsulated Copper Nanoparticles Using a Hydroalcoholic Extract of Moringa oleifera Leaves and Assessment of Their Antioxidant and Antimicrobial Activities

Molecules ◽  
2020 ◽  
Vol 25 (3) ◽  
pp. 555 ◽  
Author(s):  
Prince Edwin Das ◽  
Imad A. Abu-Yousef ◽  
Amin F. Majdalawieh ◽  
Srinivasan Narasimhan ◽  
Palmiro Poltronieri
Keyword(s):  
Electron Microscopy ◽  
Green Synthesis ◽  
Copper Nanoparticles ◽  
Moringa Oleifera ◽  
Metallic Copper ◽  
Total Phenolic ◽  
Copper Sulphate Solution ◽  
Hydroalcoholic Extract ◽  
Moringa Oleifera Leaves ◽  
Anti Fungal

The synthesis of metal nanoparticles using plant extracts is a very promising method in green synthesis. The medicinal value of Moringa oleifera leaves and the antimicrobial activity of metallic copper were combined in the present study to synthesize copper nanoparticles having a desirable added-value inorganic material. The use of a hydroalcoholic extract of M. oleifera leaves for the green synthesis of copper nanoparticles is an attractive method as it leads to the production of harmless chemicals and reduces waste. The total phenolic content in the M. oleifera leaves extract was 23.0 ± 0.3 mg gallic acid equivalent/g of dried M. oleifera leaves powder. The M. oleifera leaves extract was treated with a copper sulphate solution. A color change from brown to black indicates the formation of copper nanoparticles. Characterization of the synthesized copper nanoparticles was performed using ultraviolet-visible light (UV-Vis) spectrophotometry, Fourier-transform infrared (FTIR) spectrometry, high-resolution transmission electron microscopy (HRTEM), scanning electron microscopy (SEM), and X-ray diffraction (XRD). The synthesized copper nanoparticles have an amorphous nature and particle size of 35.8-49.2 nm. We demonstrate that the M. oleifera leaves extract and the synthesized copper nanoparticles display considerable antioxidant activity. Moreover, the M. oleifera leaves extract and the synthesized copper nanoparticles exert considerable anti-bacterial activity against Escherichia coli, Klebsiella pneumoniae, Staphylococcus aureus, and Enterococcus faecalis (MIC values for the extract: 500, 250, 250, and 250 µg/mL; MIC values for the copper nanoparticles: 500, 500, 500, and 250 µg/mL, respectively). Similarly, the M. oleifera leaves extract and the synthesized copper nanoparticles exert relatively stronger anti-fungal activity against Aspergillus niger, Aspergillus flavus, Candida albicans, and Candida glabrata (MIC values for the extract: 62.5, 62.5, 125, and 250 µg/mL; MIC values for the copper nanoparticles: 125, 125, 62.5, and 31.2 µg/mL, respectively). Our study reveals that the green synthesis of copper nanoparticles using a hydroalcoholic extract of M. oleifera leaves was successful. In addition, the synthesized copper nanoparticles can be potentially employed in the treatment of various microbial infections due to their reported antioxidant, anti-bacterial, and anti-fungal activities.

scholarly journals High Activity of Au/K/TiO2(110) for CO Oxidation: Alkali-Metal-Enhanced Dispersion of Au and Bonding of CO

2018 ◽  
Vol 122 (8) ◽  
pp. 4324-4330 ◽  
Author(s):  
José A. Rodriguez ◽  
David C. Grinter ◽  
Pedro J. Ramírez ◽  
Dario J. Stacchiola ◽  
Sanjaya Senanayake
Keyword(s):  
Alkali Metal ◽  
Co Oxidation ◽  
High Activity

Synthesis of metallic copper nanoparticles in aqueous solution by surfactant-free reduction and silica coating

2020 ◽  
Vol 74 (9) ◽  
pp. 2813-2820 ◽  
Author(s):  
Hikaru Hayashida ◽  
Noriko Yamauchi ◽  
Kouichi Nakashima ◽  
Yoshio Kobayashi
Keyword(s):  
Aqueous Solution ◽  
Copper Nanoparticles ◽  
Metallic Copper ◽  
Silica Coating

scholarly journals Synthesis of Copper Nanoparticles Coated with Nitrogen Ligands

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Rubén Sierra-Ávila ◽  
Marissa Pérez-Alvarez ◽  
Gregorio Cadenas-Pliego ◽  
Carlos Alberto Ávila-Orta ◽  
Rebeca Betancourt-Galindo ◽  
...  
Keyword(s):  
Copper Nanoparticles ◽  
Metallic Copper ◽  
Good Alternative ◽  
Average Particle ◽  
Chemical Methods ◽  
Nitrogen Ligands ◽  
Copper Sulfate Pentahydrate ◽  
Wet Chemical ◽  
High Yields ◽  
Thermal Stability Of

The synthesis of copper nanoparticles was studied by wet chemical methods using copper sulfate pentahydrate (CuSO4·5H2O) and nitrogen ligands allylamine (AAm) and polyallylamine (PAAm) as stabilizers. The results suggest that the use of these ligands leads to the exclusive formation of metallic copper nanoparticles (Cu-NPs). The use of partially crosslinked polyallylamine (PAAmc) leads to nanoparticles (NPs) with low yields and high coating content, while linear PAAm leads to NPs with high yields and low coating content. The chemical composition of the particles was determined by XRD and average particle diameters were determined by the Debye-Scherrer equation. TGA analysis provided evidence of the content and thermal stability of the coating on the nanoparticles and PAAm. The morphology, particle size distribution, and presence of PAAm coating were observed through TEM. The use of AAm in the synthesis of NPs could be a good alternative to reduce costs. By using TGA, TEM, and DSC techniques, it was determined that synthesized NPs with AAm presented a coating with similar characteristics to NPs with PAAm, suggesting that AAm underwent polymerization during the synthesis.

X-ray absorption and luminescence properties of metallic copper nanoparticles embedded in a glass matrix

2006 ◽  
Vol 243 (6) ◽  
pp. 1337-1346 ◽  
Author(s):  
J. Roqué ◽  
N. R. J. Poolton ◽  
J. Molera ◽  
A. D. Smith ◽  
E. Pantos ◽  
...  
Keyword(s):  
Copper Nanoparticles ◽  
Glass Matrix ◽  
Metallic Copper ◽  
Luminescence Properties ◽  
X Ray ◽  
X Ray Absorption
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