Kinetics and Surface Composition of Au/Pt Nanoparticles Synthesized in Microemulsion Template Using a Prediction Model | Chapter 8 | Advances and Challenges in Science and Technology Vol. 3

 The objective concerning this study is producing custom-made Au/Pt nanoparticles. The presence of Au on the surface of Au/Pt nanocatalysts has existed shown to increase the Pt catalytic activity. That is why the strength to exert control over surface arrangement is key to improve impetuses efficiency of bimetallic nanoparticles. A computer imitation study was carried out in consideration of comprehend how the developing surface can be reduced by the simple method of varying Au:Pt percentage. We present an in-depth energetic simulation study on the influence of Au:Pt ratio on the establishment of Au/Pt nanoparticles synthetized in microemulsions. The resulting nanostructures and surface arrangements are explained as a function of kinetic limits such as Au:Pt percentage, concentration and intermicellar rate of exchange. It should be stressed that the compartmentalization of the backlash medium play a fundamental role in the combination because micelles act as drug pump of the faster forerunner metal (Au). It allows us to interpret that a higher Au forerunner amount in feeding resolution results in a Au reduction which takes place over a more protracted period of time. As a result, Au is located until longer stages of the combining, so that Au is present at nanoparticle surface. Micelles as response media produces a minor affect Pt due to its more gradual reduction. By regulating the Au:Pt ratio, it is possible to build surfaces with distinguishing compositions based on the apparent kinetic acts of Au and Pt. The conclusions on the scope of atomic mixing under different Au:Pt ratios are further by means of numerical results on surface composition, that correctly mirror exploratory data.

Author(s) Details:

Jorge Perez-Alvarez,
Physical Chemistry Department, University of Vigo, E-36310, Vigo, Spain.

Concha Tojo,
Physical Chemistry Department, University of Vigo, E-36310, Vigo, Spain.

David Buceta,
Laboratorio de Magnetismo y Nanotecnología, University of Santiago de Compostela, E-15782, Santiago de Compostela, Spain.

M. Arturo Lopez-Quintela,
Laboratorio de Magnetismo y Nanotecnología, University of Santiago de Compostela, E-15782, Santiago de Compostela, Spain.

Please see the link here: https://stm.bookpi.org/ACST-V3/article/view/12020

Micelles as Supercages for Bimetallic Nanoparticles Synthesis| Chapter 8 | Recent Progress in Science and Technology Vol. 2

 The bettering of the bimetallic nanoparticles characteristics depends the ability to tune the alloy arrangement and surface features, which requires an progressive control of the synthetic design. We carried out a calculating simulation study on the formation of bimetallic nanoparticles apiece microemulsion route. A comprehensive reasoning of the resulting nanostructures was acted in the light of the influence of intermicellar exchange on reactivity. For a couple of metals whose dissimilarity in standard reduction potentials is about 0.2- 0.3 V, and utilizing a quite flexible surfactant, the response rate of each metal was listened versus occasion using different catalyst proportions. It was confirmed that reaction rates depends not only on the synthetic reduction rate but also on intermicellar rate of exchange, because the intermicellar exchange plays as drug pump, which results in an growth of slower forerunners within micelles, with improving the slower synthetic reduction. So the duller reduction rate strongly depends on the portion of reactants in micelles. On the contrary, faster reduction rate is just restricted by the intermicellar rate of exchange, and no reactants accumulation takes place. This different interaction between two together metal decline rates and the compartmentalization of the reaction media have key consequences on the sequence of metals decline. Hence different precursor portions leads to different sequences of metals decline, so the arrangement of two together metals in the resulting nanostructure can be maneuvered just by changing the forerunner proportions.

Author(s) Details:

C. Tojo,
Physical Chemistry Department, Faculty of Chemistry, University of Vigo, E-36310, Vigo, Spain.

E. Gonzalez,
Physical Chemistry Department, Faculty of Chemistry, University of Vigo, E-36310, Vigo, Spain.

N. Vila-Romeu,
Physical Chemistry Department, Faculty of Sciences, University of Vigo, E-32004, Ourense, Spain.

Please see the link here: https://stm.bookpi.org/RPST-V2/article/view/9239

Comparative Study on Metal Segregation of Bimetallic Nanocatalysts Prepared by a One-Pot Method in Microemulsions | Chapter 12 | Current Perspectives on Chemical Sciences Vol. 10

 A comparison of several bimetallic nanocatalysts made from microemulsion utilising a one-pot approach was conducted. The combination of experimental observations and simulation research provides a complete understanding of the elements that influence nanoparticle architecture: 1.- In bimetallic nanocatalysts, metal segregation is the result of a combination of three main kinetic parameters: metal precursor reduction rate (related to reduction standard potentials), material intermicellar exchange rate (determined by microemulsion composition), and metal precursor concentration. 2.- To create a core-shell structure, a minimum difference of 0.20 V between the reduction standard potentials of the two metals is required. The formation of alloys cannot be avoided for values ° less than 0.20 V, regardless of whether the microemulsion is changed or the metal concentration is increased. 3.- The higher the degree of mixing in the nanocatalyst, the more flexible the film around the micelles is. 4.- A core-shell structure requires a minimal concentration of metal precursors. This minimum concentration is determined by the flexibility of the microemulsion as well as the differential in reduction rates.

Author (s) Details

C. Tojo
Physical Chemistry Department, University of Vigo, E-36310, Vigo, Spain.

D. Buceta
Laboratorio de Magnetismo y Nanotecnología, University of Santiago de Compostela, E-15782, Santiago de Compostela, Spain.

M. A. López-Quintela
Laboratorio de Magnetismo y Nanotecnología, University of Santiago de Compostela, E-15782, Santiago de Compostela, Spain.

View Book :- https://stm.bookpi.org/CPCS-V10/article/view/1233