scholarly journals The stability and catalytic activity of W13@Pt42 core-shell structure

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Jin-Rong Huo ◽  
Xiao-Xu Wang ◽  
Lu Li ◽  
Hai-Xia Cheng ◽  
Yan-Jing Su ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Shell Structure ◽  
Core Shell ◽  
Core Shell Structure ◽  
The Stability

Core–shell stability of nanoparticles plays an important role for overcoming the intestinal mucus and epithelium barrier

2016 ◽  
Vol 4 (35) ◽  
pp. 5831-5841 ◽  
Author(s):  
Min Liu ◽  
Lei Wu ◽  
Xi Zhu ◽  
Wei Shan ◽  
Lian Li ◽  
...  
Keyword(s):  
Shell Structure ◽  
Core Shell ◽  
The Core ◽  
Shell Stability ◽  
Intestinal Mucus ◽  
Core Shell Structure ◽  
The Stability

The stability of the core–shell structure plays an important role in the nanoparticles ability to overcome both the mucus and epithelium absorption barrier.

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.

Enhanced catalytic activity of cobalt nanoparticles encapsulated with an N-doped porous carbon shell derived from hollow ZIF-8 for efficient synthesis of nitriles from primary alcohols in water

2019 ◽  
Vol 21 (16) ◽  
pp. 4334-4340 ◽  
Author(s):  
Kang-kang Sun ◽  
Jia-lin Sun ◽  
Guo-Ping Lu ◽  
Chun Cai
Keyword(s):  
Catalytic Activity ◽  
Shell Structure ◽  
Cobalt Catalyst ◽  
Cobalt Nanoparticles ◽  
Core Shell ◽  
Efficient Synthesis ◽  
Primary Alcohols ◽  
Mild Conditions ◽  
Core Shell Structure ◽  
Unique Core

A cobalt catalyst derived from a unique core–shell structure based on hollow ZIF-8 and ZIF-67 is prepared for the synthesis of nitriles from alcohols in water under mild conditions.

Tuning the Band Structure of MoS2 via Co9S8@MoS2 Core–Shell Structure to Boost Catalytic Activity for Lithium–Sulfur Batteries

ACS Nano ◽  
2020 ◽  
Vol 14 (12) ◽  
pp. 17285-17294
Author(s):  
Boyu Li ◽  
Qingmei Su ◽  
Lintao Yu ◽  
Jun Zhang ◽  
Gaohui Du ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Band Structure ◽  
Shell Structure ◽  
Core Shell ◽  
Lithium Sulfur Batteries ◽  
Core Shell Structure ◽  
Lithium Sulfur

scholarly journals Design of Scorodite@Fe3O4 Core–Shell Materials and the Fe3O4 Shell Prevents Leaching of Arsenic from Scorodite in Neutral and Alkaline Environments

Coatings ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 523
Author(s):  
Yang Wang ◽  
Zhihao Rong ◽  
Xincun Tang ◽  
Shan Cao
Keyword(s):  
Photoelectron Spectroscopy ◽  
Shell Structure ◽  
Molar Ratio ◽  
Alkaline Solutions ◽  
Arsenic Content ◽  
Core Shell ◽  
X Ray ◽  
Core Shell Structure ◽  
The Stability ◽  
Fe3o4 Core

In recent years, arsenic pollution has seriously harmed human health. Arsenic-containing waste should be treated to render it harmless and immobilized to form a stable, solid material. Scorodite (iron arsenate) is recognized as the best solid arsenic material in the world. It has the advantages of high arsenic content, good stability, and a low iron/arsenic molar ratio. However, scorodite can decompose and release arsenic in a neutral and alkaline environment. Ferroferric oxide (Fe3O4) is a common iron oxide that is insoluble in acid and alkali solutions. Coating a Fe3O4 shell that is acid- and alkali-resistant on the surface of scorodite crystals will improve the stability of the material. In this study, a scorodite@Fe3O4 core–shell structure material was synthesized. The synthesized core–shell material was detected by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), Raman, and energy-dispersive X-ray spectroscopy (EDS) techniques, and the composition and structure were confirmed. The synthesis condition and forming process were analyzed. Long-term leaching tests were conducted to evaluate the stability of the synthesized scorodite@Fe3O4. The results indicate that the scorodite@Fe3O4 had excellent stability after 20 days of exposure to neutral and weakly alkaline solutions. The inert Fe3O4 shell could prevent the scorodite core from corrosion by the external solution. The scorodite@Fe3O4 core–shell structure material was suitable for the immobilization of arsenic and has potential application prospects for the treatment of arsenic-containing waste.

Design and Preparation of Rubber Ideal Filler

2006 ◽  
Vol 11-12 ◽  
pp. 525-528 ◽  
Author(s):  
Jian Jun Zhou ◽  
Ya Kang Liu ◽  
Wei Zhao ◽  
You Ping Wu ◽  
Li Qun Zhang
Keyword(s):  
Shell Structure ◽  
Styrene Butadiene Rubber ◽  
Cross Linking ◽  
Core Shell ◽  
Butadiene Rubber ◽  
Seeded Emulsion Polymerization ◽  
Polymeric Particles ◽  
Core Shell Structure ◽  
The Stability ◽  
Styrene Butadiene

Since rubber was applied in people’s normal life, researchers have started to exploit the rubber reinforcing techniques and the relative mechanism. Developing high-effective, simple and economical reinforcing methods and fillers are the emphasis of rubber industry, technology and science. In this paper a rubber ideal filler (IF) is shown. This IF is a kind of composite with core-shell structure which was synthesized by seeded emulsion polymerization. It used styrene (St), polybutadiene oligomer (PBD) as monomers and divinyl benzene (DVB) as cross-linking agent. The effect of the amount of cross-linking agent, concentration of emulsifier and initiator on the stability of the emulsion was studied. The morphology of the latex particles with core-shell structure was characterized by high resolution SEM (ESEM) and DSC (Tg). The results showed that cross-linking polymeric particles exhibited strong reinforcing effect on styrene-butadiene rubber (SBR).

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

scholarly journals Bimetallic Au-Pd nanoparticles supported on silica with tunable core@shell structure: Enhanced catalytic activity of Pd(core)-Au(shell) over Au(core)-Pd(shell)

2021 ◽  
Author(s):  
Gauravjyoti Dutta Kalita ◽  
Podma Pollov Sarmah ◽  
Golap Kalita ◽  
Pankaj Das
Keyword(s):  
Catalytic Activity ◽  
Shell Structure ◽  
Pd Nanoparticles ◽  
Metal Salts ◽  
Core Shell ◽  
Core Shell Structure

A facile ligand-assisted approach of synthesizing bimetallic Au-Pd nanoparticles supported on silica with tuneable core@shell structure is presented. Manoeuvring the addition sequence of metal salts, both Aucore-Pdshell (Au@Pd-SiO2) and Pdcore-Aushell...

Preparation and Exothermic Characterization of Hydroxyl-Terminated Polybutadiene(HTPB)-Coated Aluminum Nanopowders

2011 ◽  
Vol 694 ◽  
pp. 189-194 ◽  
Author(s):  
Kai Jin Huang ◽  
Chao Dong Tan ◽  
Chang Sheng Xie
Keyword(s):  
Shell Structure ◽  
Pure Oxygen ◽  
Core Shell ◽  
Hydrophilic Nature ◽  
Hydrophobic Nature ◽  
Core Shell Structure ◽  
The Stability

The HTPB-coated aluminum nanopowders were prepared by using horizontally-mounted kneading machine. The HTPB-coated aluminum nanopowders were characterized by TEM, XRD and FTIR. The exothermic characterization of the HTPB-coated aluminum nanopowders was analysized by simultaneous TG-DSC. The results show that the HTPB-coated aluminum nanopowders have a core-shell structure and the release heat enthalpy in pure oxygen is 4.954KJ/g at 542.7°C. The stability of HTPB-coated aluminum nanopowders excelled Al2O3-passivated aluminum nanopowders due to the hydrophobic nature of HTPB and the hydrophilic nature of Al2O3.

Preparation and Exothermic Characterization of Dioctyl Sebacate (DOS)-Coated Aluminum Nanopowders

2011 ◽  
Vol 79 ◽  
pp. 65-70 ◽  
Author(s):  
Kai Jin Huang ◽  
Chao Dong Tan
Keyword(s):  
Shell Structure ◽  
Pure Oxygen ◽  
Core Shell ◽  
Hydrophilic Nature ◽  
Hydrophobic Nature ◽  
Dioctyl Sebacate ◽  
Core Shell Structure ◽  
The Stability

The DOS-coated aluminum nanopowders were prepared by using a kneader. The DOS-coated aluminum nanopowders were characterized by TEM, XRD and FTIR. The exothermic characterization of the DOS-coated aluminum nanopowders was analysized by simultaneous TG-DSC. The results show that the DOS-coated aluminum nanopowders have a core-shell structure and the release heat enthalpy in pure oxygen is 4.955KJ/g at 529.2°C. The stability of DOS-coated aluminum nanopowders excels Al2O3-passivated aluminum nanopowders due to the hydrophobic nature of DOS and the hydrophilic nature of Al2O3.

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