Formation and characterization of Au–Ag bimetallic nanoparticles in water-in-oil microemulsions

2002 ◽  
Vol 12 (5) ◽  
pp. 1557-1562 ◽  
Author(s):  
Dong-Hwang Chen ◽  
Cheng-Jia Chen
Keyword(s):  
Bimetallic Nanoparticles

Synthesis of Bimetallic AuPt Nanoparticles in Aqueous Solution and Electrocatalytic Activity

2005 ◽  
Vol 900 ◽  
Author(s):  
Peter N. Njoki ◽  
Jin Luo ◽  
Aisley Jacob ◽  
Rizwan Munawar ◽  
Bilal Khan ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Electrocatalytic Activity ◽  
Bimetallic Nanoparticles ◽  
Rotating Disk ◽  
Reduction Reaction ◽  
Rotating Disk Electrode ◽  
Morphological Properties ◽  
Nanoparticle Catalysts ◽  
Bimetallic Nanoparticle

ABSTRACTThe ability to control composition and size in the synthesis of bimetallic nanoparticles is important for the exploitation of the bimetallic catalytic properties. This paper reports recent findings of an investigation of the synthesis of gold-platinum (AuPt) bimetallic nanoparticles in aqueous solution via reduction of AuCl4− and PtCl42− using a combination of reducing and capping agents. In addition to characterization of the morphological properties of the AuPt nanoparticles using TEM and XRD, the electrocatalytic activity of the carbon-supported AuPt nanoparticle catalysts was also examined for oxygen reduction reaction (ORR) using the rotating disk electrode (RDE) technique. The findings have implications to the design of bimetallic nanoparticle catalysts for fuel cell reactions.

Preparation and Characterization of Bimetallic Nanoparticles Ptx-Pd1-x Supported on Silica

2006 ◽  
pp. 559-563
Author(s):  
N. Castillo ◽  
L.A. García ◽  
A. Vázquez Z. ◽  
L. Díaz Barriga ◽  
R. Pérez
Keyword(s):  
Bimetallic Nanoparticles

scholarly journals Bimetallic Nanoparticles as a Model System for an Industrial NiMo Catalyst

Materials ◽  
2019 ◽  
Vol 12 (22) ◽  
pp. 3727
Author(s):  
Sara Blomberg ◽  
Niclas Johansson ◽  
Esko Kokkonen ◽  
Jenny Rissler ◽  
Linnéa Kollberg ◽  
...  
Keyword(s):  
Bimetallic Nanoparticles ◽  
Model System ◽  
Native Oxide ◽  
Oxide Shell ◽  
Industrial System ◽  
Narrow Size Distribution ◽  
Nimo Catalysts ◽  
Further Development ◽  
Industrial Relevance

An in-depth understanding of the reaction mechanism is required for the further development of Mo-based catalysts for biobased feedstocks. However, fundamental studies of industrial catalysts are challenging, and simplified systems are often used without direct comparison to their industrial counterparts. Here, we report on size-selected bimetallic NiMo nanoparticles as a candidate for a model catalyst that is directly compared to the industrial system to evaluate their industrial relevance. Both the nanoparticles and industrial supported NiMo catalysts were characterized using surface- and bulk-sensitive techniques. We found that the active Ni and Mo metals in the industrial catalyst are well dispersed and well mixed on the support, and that the interaction between Ni and Mo promotes the reduction of the Mo oxide. We successfully produced 25 nm NiMo alloyed nanoparticles with a narrow size distribution. Characterization of the nanoparticles showed that they have a metallic core with a native oxide shell with a high potential for use as a model system for fundamental studies of hydrotreating catalysts for biobased feedstocks.

scholarly journals Resonant-XRD Characterization of Nanoalloyed Au-Pd Catalysts for the Direct Synthesis of H2O2: Quantitative Analysis of Size Dependent Composition of the Nanoparticles †

2019 ◽  
Vol 9 (15) ◽  
pp. 2959 ◽  
Author(s):  
Paolo Centomo ◽  
Patrizia Canton ◽  
Claudio Burato ◽  
Carlo Meneghini ◽  
Marco Zecca
Keyword(s):  
Quantitative Analysis ◽  
Metal Nanoparticles ◽  
Metal Surface ◽  
Bimetallic Nanoparticles ◽  
Amorphous Polymer ◽  
Direct Synthesis ◽  
Relative Number ◽  
Pd Catalysts ◽  
X Ray

The focus of this work is on the relationship between the quantitative structural characterization of bimetallic Au-Pd nanoparticles dispersed in an amorphous polymer matrix and their catalytic activity in the direct synthesis of hydrogen peroxide (DS reaction). Resonant X-ray powder diffraction with synchrotron radiation was employed to probe selectively and to reveal fine details of the structure of bimetallic nanoparticles embedded in the support. The semi-quantitative analysis of the resonant X-ray powdered diffraction data, made on a large number of metal nanoparticles, shows that in one of the polymer-supported Au-Pd catalyst for the DS reaction (P75) featured by an overall molar Pd/Au of about 5.54, the smallest metal nanoparticles (MNPs), which account for more than 99.9% of the total MNPs number and for more than 95% of the metal surface, are formed by practically pure palladium. The relative number of bimetallic alloyed nanoparticles is very small (less than 4 × 102 ppm) and they contribute to only about 2% of the total metal surface. In a second gold-enriched catalyst (P50) with an overall molar Pd/Au of 1.84, the proportion of the bimetallic alloyed nanoparticles increased to about 97% and they account for about 99% of the metal surface. As a result of the metal intermixing, the catalytic productivity for the DS reaction increased from 97 to 109 mmolH2O2/molH2, owing to the gold-promotion of palladium.

Synthesis and characterization of Ag–Ni bimetallic nanoparticles by laser-induced plasma

2011 ◽  
Vol 519 (20) ◽  
pp. 7116-7119 ◽  
Author(s):  
Qingmei Xiao ◽  
Zhi Yao ◽  
Jiahong Liu ◽  
Ran Hai ◽  
Hassan Yousefi Oderji ◽  
...  
Keyword(s):  
Bimetallic Nanoparticles ◽  
Synthesis And Characterization ◽  
Laser Induced Plasma

Elaboration and characterization of bimetallic nanoparticles obtained by laser ablation of Ni75Pd25 and Au75Ag25 targets in water

2010 ◽  
Vol 12 (8) ◽  
pp. 3123-3136 ◽  
Author(s):  
R. Mahfouz ◽  
F. J. Cadete Santos Aires ◽  
A. Brenier ◽  
E. Ehret ◽  
M. Roumié ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Bimetallic Nanoparticles

scholarly journals The Antibacterial and Antifungal Textile Properties Functionalized by Bimetallic Nanoparticles of Ag/Cu with Different Structures

2016 ◽  
Vol 2016 ◽  
pp. 1-13 ◽  
Author(s):  
Marta Paszkiewicz ◽  
Anna Gołąbiewska ◽  
Łukasz Rajski ◽  
Ewelina Kowal ◽  
Agnieszka Sajdak ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Antimicrobial Activity ◽  
Fungicidal Activity ◽  
Bimetallic Nanoparticles ◽  
Ionic Species ◽  
Core Shell ◽  
Strong Inhibition ◽  
Ag Nps ◽  
Antibacterial And Antifungal

We reported a preparation and characterization of five kinds of impregnation solutions, containing Ag/Cu in the form of bimetallic nanoparticles (alloy and core-shell) as well as ionic species. The cotton-polyester textiles were successfully impregnated during the washing and ironing process by as-prepared solutions to have antibacterial and antifungal properties against toEscherichia coli,Staphylococcus aureus,andCandida albicans. Moreover, we have reported the effect of type of the fabric used and number of washing/impregnation cycles (in a laboratory scale) on the bactericidal and fungicidal activity of obtained textiles. The results indicated that all tested samples after 5, 10, 15, and 20 washing/impregnated cycles exhibited an antimicrobial activity. The antifungal tests showed that only textile impregnated with solutions containing Ag+/Cu2+and Ag NPs/Cu2+exhibited a strong inhibition of fungi growth of the after 5 (99.99%) and 15 (100%) washing/impregnation cycles, respectively.

Characterization of Pt-Pd Bimetallic Nanoparticles by Cs-Corrected STEM

2013 ◽  
Vol 755 ◽  
pp. 69-74
Author(s):  
O. Téllez-Vázquez ◽  
R. Esparza ◽  
G. Rodríguez-Ortiz ◽  
Amado F. García-Ruiz ◽  
R. Pérez ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Metallic Nanoparticles ◽  
Bimetallic Nanoparticles ◽  
Good Control ◽  
Dynamics Simulation ◽  
Dynamical Analysis ◽  
Atomic Column ◽  
Dynamics Simulations ◽  
Average Size

Pt-Pd bimetallic nanoparticles were characterized using aberration (Cs) corrected scanning transmission electron microscopy (STEM) along with molecular dynamics simulations. The nanoparticles were synthesized through a microwave-assisted process. This technique has been applied to synthesize metallic nanoparticles at relatively short times, allowing a good control of size distribution. The structure of the bimetallic nanoparticles is fcc-like with an average size of 5 nm. To understand the properties of the bimetallic nanoparticles, it is necessary to know the positions of all the atoms in the nanostructure. We have used a recent quantitative method to analyze HAADF STEM images which allowed us to measure the total intensity of the scattered electrons for each atomic column. Beside with the characterization of the nanoparticles, we have performed classical molecular dynamics simulation for the structural and dynamical analysis of the cuboctahedral Pt-Pd bimetallic nanoparticles.

Formation and Characterization of Bimetallic Nanoparticles in Electrochemistry

2015 ◽  
pp. 1-60
Author(s):  
Chun-Jern Pan ◽  
Loka Subramanyam Sarma ◽  
Bing-Joe Hwang
Keyword(s):  
Bimetallic Nanoparticles
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