Preparation and Catalysis of Inverted Core/Shell Structured Pd/Au Bimetallic Nanoparticles

2003 ◽  
Vol 56 (10) ◽  
pp. 1025 ◽  
Author(s):  
Yukihide Shiraishi ◽  
Daisuke Ikenaga ◽  
Naoki Toshima
Keyword(s):  
Shell Structure ◽  
Bimetallic Nanoparticles ◽  
Colloidal Dispersion ◽  
Colloidal Dispersions ◽  
Core Shell ◽  
Before And After ◽  
Ft Ir ◽  
Adsorbed Carbon ◽  
Novel Method ◽  
Precious Metal Ions

Reduction of two different precious metal ions by refluxing in ethanol/water in the presence of poly(N-vinyl-2-pyrrolidone) (PVP) gave a colloidal dispersion of core/shell structured bimetallic nanoparticles. In the case of Pd and Au ions, for example, the colloidal dispersions of bimetallic nanoparticles with a Au core/Pd shell structure are produced. In contrast, it is difficult to synthesize bimetallic nanoparticles with the inverted core/shell (in this case, Pd core/Au shell) structure. Here the sacrificial hydrogen strategy has been used to construct the inverted core/shell structure, where the colloidal dispersions of Pd cores are treated with hydrogen and then the solution of the second element, Au ions, is slowly added to the dispersions. This novel method, developed by us, gave the inverted core/shell structured bimetallic nanoparticles. The Pd core/Au shell structure has been confirmed by FT-IR spectra of adsorbed carbon monoxide. The hydrogenation of methyl acrylate catalyzed by the nanoparticles before and after heat treatment was investigated as well.

Reversible loss of core–shell structure for Ni–Au bimetallic nanoparticles during CO2 hydrogenation

2020 ◽  
Vol 3 (4) ◽  
pp. 411-417 ◽  
Author(s):  
Xiaoben Zhang ◽  
Shaobo Han ◽  
Beien Zhu ◽  
Guanghui Zhang ◽  
Xiaoyan Li ◽  
...  
Keyword(s):  
Shell Structure ◽  
Bimetallic Nanoparticles ◽  
Co2 Hydrogenation ◽  
Core Shell ◽  
Core Shell Structure ◽  
Reversible Loss

scholarly journals Tailoring the Morphology of Supraparticles by Primary Colloids with Different Shapes, Sizes and Dispersities

Crystals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 79
Author(s):  
Wonmi Shim ◽  
Chan Sik Moon ◽  
Hyeonjin Kim ◽  
Hyun Su Kim ◽  
Haoxiang Zhang ◽  
...  
Keyword(s):  
Composite Material ◽  
Colloidal Particles ◽  
Colloidal Dispersion ◽  
Colloidal Dispersions ◽  
Single Component ◽  
Promising Method ◽  
Shell Structures ◽  
Core Shell ◽  
Different Shapes ◽  
Shape And Size

Surface-templated evaporation driven (STED) method is a promising method to fabricate supraparticles with various sizes, porosities, and shapes by drying colloidal dispersion drops on liquid repellent surfaces. Until now, for the method, only spherical shaped colloidal particles have been used as primary colloids. Here, we introduce six different shapes of nano-colloidal dispersions for the STED method: nanocubics, nanoplates, nanosheets, coffin-shaped nanoparticles (NPs), spherical NPs, and aggregates of NPs. It is confirmed that the shape and size of the primary colloids have little effect for drying the dispersion drop when a single component colloidal dispersion is dried. For heterogeneous supraparticles with composite material assembly, still the shape of the colloids has no influences, while the size and dispersity play roles for tuning the morphology of the supraparticles. From the results, we propose a way to fabricate homogeneous mixture, core/shell, and Janus core/shell structures of the supraparticles depending on the size and dispersity of the mixture colloidal dispersion. Indeed, knowledge on the effects of types of colloids would be of great importance for tailoring supraparticles.

Direct imaging of core-shell structure in silver-gold bimetallic nanoparticles

2005 ◽  
Vol 87 (24) ◽  
pp. 243103 ◽  
Author(s):  
Z. Y. Li ◽  
J. Yuan ◽  
Y. Chen ◽  
R. E. Palmer ◽  
J. P. Wilcoxon
Keyword(s):  
Shell Structure ◽  
Bimetallic Nanoparticles ◽  
Core Shell ◽  
Direct Imaging ◽  
Core Shell Structure

The Production of Core-Shell Structure Carboxylated Carbon Nanotubes/Polypyrrole Composite Materials in Different Reaction Media and Further Investigation on their Core-Shell Structure

2017 ◽  
Vol 730 ◽  
pp. 37-41 ◽  
Author(s):  
Hui Li Cao ◽  
Yuan Chang Shi ◽  
Hao Shen ◽  
Hu Dong Zhan ◽  
Jiu Rong Liu
Keyword(s):  
Carbon Nanotubes ◽  
Electron Microscope ◽  
Composite Materials ◽  
Shell Structure ◽  
Core Shell ◽  
Transmission Electron ◽  
Ft Ir ◽  
Core Shell Structure ◽  
Polypyrrole Composite ◽  
Carboxylated Carbon Nanotubes

In this paper carboxylated carbon nanotubes/polypyrrole composite (CNTs/PPy) was synthesized in different surfactants aqueous under sonication. Carboxylated CNTs was synthesized in hydrogen nitrate by ultrasonic method and coated by PPy. The synthesized CNTs/PPy in different surfactants was evaluated by Fourier transform infrared spectrometer (FT-IR) and transmission electron microscope. The FT-IR patterns illustrate that CNTs were successfully doped by PPy. The morphology of CNTs/PPy synthesized showed on the transmission electron microscope images. The composite materials sythesized without surfactant are easy reunited. It is also found the surface of CNTs/PPy synthesized in cetyl trimethyl ammonium bromide (CTAB) is smoother than that in other surfactants. The coating effect is better with thicker coating layer. The higher magnification of HRTEM images show the PPy was deposited directly on the surface of carbon nanotubes. The final products are the ordered coaxial composite with well-defined core-shell structure.

scholarly journals Author Correction: Reversible loss of core–shell structure for Ni–Au bimetallic nanoparticles during CO2 hydrogenation

2021 ◽  
Vol 4 (2) ◽  
pp. 180-180
Author(s):  
Xiaoben Zhang ◽  
Shaobo Han ◽  
Beien Zhu ◽  
Guanghui Zhang ◽  
Xiaoyan Li ◽  
...  
Keyword(s):  
Shell Structure ◽  
Bimetallic Nanoparticles ◽  
Co2 Hydrogenation ◽  
Core Shell ◽  
Core Shell Structure ◽  
Reversible Loss

Study of Core-Shell Structure Poly(vinyl Acetate-Butyl Acrylate) Emulsion Particles Modification

2014 ◽  
Vol 1061-1062 ◽  
pp. 277-282 ◽  
Author(s):  
Gang Li ◽  
Ting Wang ◽  
Xin Fu ◽  
Tian Ming Gao ◽  
Mao Fang Huang
Keyword(s):  
Vinyl Acetate ◽  
Shell Structure ◽  
Butyl Acrylate ◽  
Core Shell ◽  
The Third ◽  
Transmission Electron ◽  
Acrylate Emulsion ◽  
Ft Ir ◽  
Emulsion Film ◽  
Core Shell Structure

Core-Shell structure Poly(vinyl acetate-butyl acrylate) emulsion is prepared by the semi-continuous emulsion polymerization. And the emulsion particles are modified by ethyleneglycol dimethacrylate crosslinker (EGDMA) to improve the properties of films in the different reaction stages. Then the emulsion particles structure is characterized by transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy (FT-IR). The particle size and distribution are characterized by Zata Potential- Particle analyzer, as well as analysis of the film mechanical properties and thermal performance. The results show that the emulsion particles possess a clear core-shell structure. The performance of the emulsion film show better when 1% and 0.5% EGDMA are added in the second reaction and the third reaction stage respectively under the emulsion preparation process.

scholarly journals A novel method for extraction, quantification, and identification of microplastics in CreamType of cosmetic products

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Soohyun Lee ◽  
Tai Gyu Lee
Keyword(s):  
Nile Red ◽  
Cosmetic Products ◽  
Digestion Method ◽  
Accurate Analysis ◽  
Sem Images ◽  
Cosmetic Ingredients ◽  
Before And After ◽  
Ft Ir ◽  
Novel Method ◽  
Ft Ir Spectroscopy

AbstractThe objective of this study was to develop an accessible and accurate analysis method for microplastics that have been unintentionally added to cream cosmetic products. An experiment was performed on three cleansing creams in rich and viscous formulations. A spiked sample was prepared by adding polyethylene (PE) microspheres to the cleansing creams. After removing cosmetic ingredients from the creams using chemical digestion, damage to the PE microspheres was identified using Fourier transform infrared (FT-IR) spectroscopy. Field emission scanning electron microscopy (FE-SEM) images were obtained before and after digestion and used to characterize the morphology of the PE microspheres. The highest digestion efficiency was obtained using a chemical digestion method consisting of heating and stirring a sample in a 10 wt% KOH solution at 55 °C and 300 rpm for 5 days and did not damage the PE microspheres. The Nile red (9-diethylamino-5H-benzo[α]phenoxazine-5-one) staining method was effective in identifying small microplastics (< 106 μm). The optimal staining conditions are 5 μg/ml Nile red in n-hexane for green wavelengths.

Three-Layer Core/Shell Structure in Au−Pd Bimetallic Nanoparticles

Nano Letters ◽  
2007 ◽  
Vol 7 (6) ◽  
pp. 1701-1705 ◽  
Author(s):  
D. Ferrer ◽  
A. Torres-Castro ◽  
X. Gao ◽  
S. Sepúlveda-Guzmán ◽  
U. Ortiz-Méndez ◽  
...  
Keyword(s):  
Shell Structure ◽  
Bimetallic Nanoparticles ◽  
Core Shell ◽  
Core Shell Structure

Robust synthesis of green fuels from biomass-derived ethyl esters over a hierarchically core/shell-structured ZSM-5@(Co/SiO2) catalyst

2017 ◽  
Vol 53 (73) ◽  
pp. 10172-10175 ◽  
Author(s):  
Darui Wang ◽  
Bo Wang ◽  
Yu Ding ◽  
Qingqing Yuan ◽  
Haihong Wu ◽  
...  
Keyword(s):  
Shell Structure ◽  
Ethyl Esters ◽  
Core Shell ◽  
Novel Method ◽  
Core Shell Structure ◽  
Green Fuels ◽  
Robust Synthesis

Bifunctional ZSM-5@(Co/SiO2) with a hierarchical core/shell structure was successfully prepared through a novel method, which served as an excellent catalyst in the synthesis of green fuels.

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