Controlling core/shell Au/FePt nanoparticle electrocatalysis via changing the core size and shell thickness

Nanoscale ◽  
2016 ◽  
Vol 8 (5) ◽  
pp. 2626-2631 ◽  
Author(s):  
Xiaolian Sun ◽  
Dongguo Li ◽  
Shaojun Guo ◽  
Wenlei Zhu ◽  
Shouheng Sun
Keyword(s):  
Catalytic Activity ◽  
Shell Thickness ◽  
Core Shell ◽  
Fept Nanoparticles ◽  
Core Size ◽  
The Core ◽  
Fept Nanoparticle

We optimized the catalytic activity of core/shell Au/FePt nanoparticles (NPs) by finely tuning Au sizes of 4, 7, and 9 nm and FePt shells with similar FePt compositions but 0.5, 1, and 2 nm thickness.

Core@shell nanostructured Au-d@NimPtm for electrochemical oxygen reduction reaction: effect of the core size and shell thickness

2019 ◽  
Vol 9 (17) ◽  
pp. 4668-4677 ◽  
Author(s):  
Min Zhang ◽  
Shu Miao ◽  
Bo-Qing Xu
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Shell Thickness ◽  
Reduction Reaction ◽  
Core Shell ◽  
Core Size ◽  
The Core ◽  
Electrocatalytic Performance ◽  
Electrochemical Oxygen

Au-d@NimPtm nanostructures are studied to address the effects of the Au-core size (d) and NiPt-shell thickness (m) on the electrocatalytic performance of Pt for the ORR.

Photonic coupled systems between on-chip integrated microresonator and core-shell nanoparticle

2015 ◽  
Vol 1728 ◽  
Author(s):  
Y. Xiong ◽  
P. Pignalosa ◽  
Y. Yi
Keyword(s):  
Shell Thickness ◽  
Resonance Wavelength ◽  
Coupled Systems ◽  
Wavelength Shift ◽  
Core Shell ◽  
Core Size ◽  
Disk Resonator ◽  
Shell Nanoparticles ◽  
The Core ◽  
Core Shell Nanoparticles

ABSTRACTWe have numerically investigated the unique effects of the core-shell nanoparticles on the integrated micro disk resonator. By attaching the core-shell nanoparticle to the disk resonator with gold core and polymer shell, the coupling between the disk resonator and the core-shell nanoparticle results in shift of the resonance wavelength of the disk resonator, depending on the core size/shell thickness of the nanoparticle. An ‘invisibility’ phenomenon found from the coupled core-shell nanoparticle and integrated disk resonator system is emphasized: at certain core size/shell thickness ratio, compared to the original resonance wavelength without core-shell nanoparticle, there is almost no resonance wavelength shift observed. The dependence of the position and number of core-shell nanoparticles is also discussed. Future studies on this coupled photonic systems will stimulate wide variety of applications.

Optical Temperature Sensing of Core-Shell Structured NaYF4:Yb3+, Er3+@NaYF4 Nanocrystals with Different Shell Thickness

2015 ◽  
Vol 738-739 ◽  
pp. 27-30
Author(s):  
Dong Dong Li ◽  
Qi Yue Shao ◽  
Yan Dong ◽  
Jian Qing Jiang
Keyword(s):  
Shell Thickness ◽  
Thermal Sensitivity ◽  
Upconversion Luminescence ◽  
Temperature Sensing ◽  
Upconversion Nanoparticles ◽  
Core Shell ◽  
Sensing Properties ◽  
The Core ◽  
Β Phase ◽  
Biomedical Fields

Hexagonal (β)-phase NaYF4:Yb3+, Er3+ upconversion nanoparticles (UCNPs) with and without an inert (undoped NaYF4) shell have been successfully synthesized and the effects of shell thickness on the upconversion luminescence (UCL) and temperature sensing properties were systematically investigated. It was found that the NaYF4 shell and its thickness do not affect the RHS values and thermal sensitivity, but can obviously improve the UCL intensity of NaYF4:Yb3+, Er3+ UCNPs. It implies that the core-shell structured NaYF4:Yb3+, Er3+@NaYF4 UCNPs with excellent UCL properties have great potential to be used as temperature sensing probes in biomedical fields, without considering the influences of the shell thickness on their temperature sensing properties.

scholarly journals Synthesis and Control of the Shell Thickness of Polyaniline and Polypyrrole Half Hollow Spheres Using the Polystyrene Cores

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Su-Ryeon Yun ◽  
Gyeong-Ok Kim ◽  
Chan Woo Lee ◽  
Nam-Ju Jo ◽  
Yongku Kang ◽  
...  
Keyword(s):  
Shell Thickness ◽  
Hollow Spheres ◽  
Core Shell ◽  
Chemical Structures ◽  
The Core ◽  
Vis Spectroscopy ◽  
Ft Ir ◽  
Core Shell Structure ◽  
And Control ◽  
Ft Ir Spectroscopy

Polyaniline (Pani) and polypyrrole (Ppy) half hollow spheres with different shell thicknesses were successfully synthesized by three steps process using polystyrene (PS) as the core. The PS core was synthesized by emulsion polymerization. Aniline and pyrrole monomers were polymerized on the surface of the PS core. The shells of Pani and Ppy were fabricated by adding different amounts of aniline and pyrrole monomers. PS cores were dissolved and removed from the core shell structure by solvent extraction. The thicknesses of the Pani and Ppy half hollow spheres were observed by FE-SEM and FE-TEM. The chemical structures of the Pani and Ppy half hollow spheres were characterized by FT-IR spectroscopy and UV-Vis spectroscopy. The shell thicknesses of the Pani half hollow spheres were 30.2, 38.0, 42.2, 48.2, and 52.4 nm, while the shell thicknesses of the Ppy half hollow spheres were 16.0, 22.0, 27.0, and 34.0 nm. The shell thicknesses of Pani and Ppy half hollow spheres linearly increased as the amount of the monomer increased. Therefore, the shell thickness of the Pani and Ppy half hollow spheres can be controlled in these ranges.

Effect of the core-shell impact modifier shell thickness on toughening PVC

2004 ◽  
Vol 44 (10) ◽  
pp. 1885-1889 ◽  
Author(s):  
Juh-Shyong Lee ◽  
Feng-Chih Chang
Keyword(s):  
Shell Thickness ◽  
Core Shell ◽  
The Core ◽  
Impact Modifier

Preparation, Characterization and Visible-Light Catalytic Activity of Core-Shell Structure NiFe2O4@TiO2 Ferrite Nanoparticles

2016 ◽  
Vol 680 ◽  
pp. 272-277
Author(s):  
Zhou Li Lu ◽  
Peng Zhao Gao ◽  
Rui Xue Ma ◽  
Yu Kun Sun ◽  
Dong Yun Li
Keyword(s):  
Catalytic Activity ◽  
Visible Light ◽  
Shell Structure ◽  
Shell Thickness ◽  
Spinel Ferrite ◽  
Sol Gel ◽  
Magnetic Core ◽  
Core Shell ◽  
Calcination Temperatures ◽  
Core Shell Structure

The core-shell structure NiFe2O4@TiO2 nanoparticles was successfully prepared using a sol-gel method, the influence of shell thickness and calcination temperatures on the composition, microstructure, magnetic properties and visible-light catalytic activity of the nanoparticles was studied by XRD, TEM, Uv–vis, vibrating sample magnetometer, etc. Results showed the main composition of core in NiFe2O4@TiO2 was spinel ferrite, and the shell was anatase TiO2, and theshell thickness increased significantly with the increase of TiO2 content, ranging from 10nm to 50nm. The Ms and Mr of nanoparticles decreased with the increase of TiO2 content, and no obvious reaction between the magnetic core and shell occurred; visible-light degradation percent of NiFe2O4@TiO2 nanoparticles increased along with the increase of TiO2 content, whereas the recovery rate of it decreased. Degradation percent and the recovery percent of NiFe2O4@TiO2-50 still reached 93.7% and 90.5%, even after 10 cycle times, respectively, possessing the excellent long-term stability.

scholarly journals Design and fabrication of 125I seeds for brachytherapy using capillary-based microfluidic technique

Nukleonika ◽  
2021 ◽  
Vol 66 (2) ◽  
pp. 55-60
Author(s):  
Yuan Wang ◽  
Miao Zhang ◽  
Tong Song ◽  
Zhenqi Chang
Keyword(s):  
Monte Carlo ◽  
Dose Distribution ◽  
Core Shell ◽  
Core Size ◽  
The Core ◽  
125I Seeds ◽  
Transport Code ◽  
Core Shell Structure ◽  
Brachytherapy Source ◽  
Microfluidic Technique

Abstract A new kind of 125I seeds with a core-shell structure were synthesized by an easy assembling–disassembling coaxial capillaries microfluidic device. The dose distribution of a 125I brachytherapy source fabricated by arranging six 125I seeds collinearly within a cylindrical titanium capsule was simulated by modelling the source in a water phantom using Monte Carlo N-Particle Transport code. The influence of the motion and the core size of the 125I seeds on the dose distribution was also studied in this work.

scholarly journals Stress Distribution in Microregion of Core–Shell Structure Lightweight Aggregate Concrete

Buildings ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 540
Author(s):  
Meng Zhu ◽  
Lihua Zhang ◽  
Weilong Wang ◽  
Hongping Zhang ◽  
Wenjin Xing
Keyword(s):  
Stress Distribution ◽  
Shell Structure ◽  
Shell Thickness ◽  
Lightweight Aggregate ◽  
Thickness Ratio ◽  
Core Shell ◽  
Distribution Analysis ◽  
Failure Resistance ◽  
The Core ◽  
Core Shell Structure

An in-depth understanding of the effect of cordierite/belite core–shell structure lightweight aggregate (CSLWA) on the mechanical performance of LWA concrete (LWAC) is critical for improving the failure resistance of LWAC. In this study, the stress distribution of the microregion in CSLWA was systematically investigated via a finite element analysis to explore its effect on the mechanical properties of LWAC. In detail, the material components, core–shell thickness ratio, porosity and width of interfacial transition zone (ITZ), and absence or presence of interfacial bonding zone (IBZ) were considered during the stress distribution analysis of the microregion of LWAC. The results showed that a reduction in the material components, with a high-elastic modulus in the core, a decrease in the core–shell thickness ratio, and the formation of the core–shell IBZ are beneficial for optimizing the stress distribution of the microregion and alleviating the stress concentration phenomenon of LWAC. Moreover, due to the continuous hydration of belite shell, the ITZ of CSLWA becomes increasingly dense, thus the stress distribution is more uniform than that of ordinary LWAC, indicating that CSLWA exhibits the potential to improve the failure resistance of LWAC. This study helps to develop an understanding of the role played by the core–shell structure in improving the toughness of LWAC, and provides a new solution and methodology for improving the brittleness of LWAC.

Dependence of Relaxation Time on the Core Size Two-Phase Nanoparticles Magnetite/Titanomagnetite

2015 ◽  
Vol 752-753 ◽  
pp. 418-421
Author(s):  
Ilia Iliushin ◽  
Leonid Afremov ◽  
Sergey Anisimov
Keyword(s):  
Relaxation Time ◽  
Blocking Temperature ◽  
Exchange Constant ◽  
Core Shell ◽  
Core Size ◽  
Shell Nanoparticles ◽  
Two Phase ◽  
The Core ◽  
Core Shell Nanoparticles ◽  
Model Nanoparticles

In this paper, depending of the blocking temperature on magnetite core size for core/shell nanoparticles has been carried out using our theoretical model. Nanoparticles has size of 100nm, and magnetite core increases from 0nm to 100nm. Systems were studied with different values of exchange constant. The data obtained indicate that exchange constant increases the blocking temperature. However, the sign of the constant does not matter.

scholarly journals Tuning the Core–Shell Structure of Au144@Fe2O3 for Optimal Catalytic Activity for CO Oxidation

2018 ◽  
Vol 148 (8) ◽  
pp. 2315-2324
Author(s):  
Michelle Lukosi ◽  
Chengcheng Tian ◽  
Xinyi Li ◽  
Shannon M. Mahurin ◽  
Harry M. Meyer ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Co Oxidation ◽  
Shell Structure ◽  
Core Shell ◽  
The Core ◽  
Core Shell Structure
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