Ferromagnetic ZnO-TiO2 Core-Shell Nanowire PhotoCatalyst with High Efficiency and Recyclability

2011 ◽  
Vol 90-93 ◽  
pp. 1702-1705
Author(s):  
Xi Zhang ◽  
Gang Xiang
Keyword(s):  
High Efficiency ◽  
Hole Concentration ◽  
Band Gaps ◽  
The Other ◽  
Band Edge ◽  
Core Shell ◽  
Hole Density ◽  
The Core ◽  
Recyclable Photocatalyst ◽  
Shell Nanowires

We demonstrate the design of the recyclable photocatalyst based on ferromagnetic (FM) ZnO- TiO2 core-shell nanowires (NWs). Since the band gaps and band edge energies of bulk ZnO and anatase TiO2 are equal to each other within about 45mV, TiO2 and ZnO can form an p-p+ heterojunction free of band discontinuities and with a built-in potential. The resulting radial field will increase hole density in the TiO2 layer while reduce hole concentration at the interface between the core and the shell, which in turn will decrease the rate of recombination in the photocatalytic TiO2, and hence increase the efficiency of photocatalyst. On the other hand, the NWs with FM cores can be easily collected and refreshed using solenoid and suitable for the recyclable usage of the NW catalyst

Effect of glycidyl methacrylate (GMA) on the stability of acrylic latex

e-Polymers ◽  
2008 ◽  
Vol 8 (1) ◽  
Author(s):  
Guangfeng Wu ◽  
Yue Tao ◽  
Hong Kang ◽  
Huixuan Zhang
Keyword(s):  
Experimental Data ◽  
Glycidyl Methacrylate ◽  
Sodium Dodecyl ◽  
The Other ◽  
Lower Amount ◽  
Core Shell ◽  
Acrylic Latex ◽  
The Core ◽  
Shell Particles ◽  
The Stability

AbstractThe stability of core-shell particles (CSPs) with butyl acrylate (BA) as the core and methyl methacrylate (MMA)/glycidyl methacrylate (GMA) mixture in various compositions as the shell was investigated by turbidity measurements. The experiments demonstrate that lower amount addition of GMA could not improve the latex stability. When the amount of GMA exceeded 2% of the total reactants, it began to improve the stability of the latex. With the increasing content of GMA, the latex became more and more stable. On the other hand, experimental data also show that the stability was improved by increasing the concentration of sodium dodecyl sulfate (SDS).

Regulating the electronic and optical properties of GaN/InN core/shell nanowires: A first-principles study

2020 ◽  
Vol 34 (25) ◽  
pp. 2050214 ◽  
Author(s):  
Chang Liu ◽  
Enling Li ◽  
Tuo Peng ◽  
Kaifei Bai ◽  
Yanpeng Zheng ◽  
...  
Keyword(s):  
Optical Properties ◽  
First Principles ◽  
Core Shell ◽  
First Principles Calculations ◽  
Electronic And Optical Properties ◽  
Gan Nanowires ◽  
The Core ◽  
Light Region ◽  
Calculation Results ◽  
Shell Nanowires

In this paper, electronic and optical properties of GaN/InN core/shell nanowires (CSNWs) have been theoretically investigated through the first principles calculations. The binding energy of In and N atoms on surface of six crystal planes along the [Formula: see text]-axis of GaN nanowires are all negative, which indicate that In and N atoms can be effectively deposited on the surface of GaN nanowires and preparing GaN/InN CSNWs is feasible theoretically. Calculation results of electronic properties indicate that the core/shell ratio and diameter of GaN/InN CSNWs have significant effect on the band structure, bandgap can be effectively adjusted when keeping the number of GaN layers unchanged and changing the number of InN layers. Moreover, with the increase in the number of InN layers, the absorption spectrum of GaN/InN CSNW has significant redshift and few weak absorption peaks appear in the visible light region.

scholarly journals Design of Dipole-Allowed Direct Band Gaps in Ge/Sn Core–Shell Nanowires

2016 ◽  
Vol 120 (49) ◽  
pp. 28169-28175 ◽  
Author(s):  
Elisabeth Pratidhina ◽  
Sunghyun Kim ◽  
K. J. Chang
Keyword(s):  
Band Gaps ◽  
Core Shell ◽  
Direct Band ◽  
Shell Nanowires

EFFECT OF ELECTRIC FIELD, TEMPERATURE AND CORE DIMENSIONS IN III–V COMPOUND CORE–SHELL NANOWIRES

NANO ◽  
2014 ◽  
Vol 09 (04) ◽  
pp. 1450051
Author(s):  
ASHWANI VERMA ◽  
BAHNIMAN GHOSH ◽  
AKSHAY KUMAR SALIMATH
Keyword(s):  
Monte Carlo ◽  
Electric Field ◽  
Spin Relaxation ◽  
Compound Semiconductor ◽  
Core Shell ◽  
Relaxation Length ◽  
The Core ◽  
Field Temperature ◽  
Simulation Results ◽  
Shell Nanowires

In this paper, we have used semiclassical Monte Carlo method to show the dependence of spin relaxation length in III–V compound semiconductor core–shell nanowires on different parameters such as lateral electric field, temperature and core dimensions. We have reported the simulation results for electric field in the range of 0.5–10 kV/cm, temperature in the range of 77–300 K and core length ranging from 2 nm to 8 nm. The spin relaxation mechanisms used in III–V compound semiconductor core–shell nanowire are D'yakonov–Perel (DP) relaxation and Elliott–Yafet (EY) relaxation. Depending upon the choice of materials for core and shell, nanowire forms two types of band structures. We have used InSb – GaSb core–shell nanowire and InSb – GaAs core–shell nanowire and nanowire formed by swapping the core and shell materials to show all the results.

scholarly journals Corrosion – inhibiting properties of molybdenum-containing pigments in coatings

2015 ◽  
Vol 63 (1) ◽  
pp. 14-28 ◽  
Author(s):  
Tereza Hájková ◽  
Andrea Kalendova
Keyword(s):  
Corrosion Protection ◽  
Particle Shape ◽  
High Efficiency ◽  
Industrial Applications ◽  
Core Shell ◽  
Pigment Volume Concentration ◽  
Content Type ◽  
The Core ◽  
Isometric Particle ◽  
Protection Of Metals

Purpose – This paper aims to synthesise anticorrosion pigments containing molybdenum for paints intended for corrosion protection of metals. Design/methodology/approach – The anticorrosion pigments were prepared by high-temperature solid-state synthesis from the appropriate oxides, carbonates and calcium metasilicate. Stoichiometric molybdates and core-shell molybdates with a non-isometric particle shape containing Ca, Sr, Zn, Mg and Fe were synthesised. The pigments were examined by X-ray diffraction analysis and scanning electron microscopy. Paints based on an epoxy resin and containing the substances at a pigment volume concentration of 10 volume per cent were prepared. The paints were subjected to physico-mechanical tests and to tests in corrosion atmospheres. The corrosion test results were compared to those of the paint with a commercial pigment, which is used in many industrial applications. Findings – The molybdate structure of each pigment prepared was elucidated. The core-shell molybdates exhibit a non-isometric particle shape. The pigments prepared were found to impart a very good anticorrosion efficiency to the paints. A high anticorrosion efficiency was found with the pigments Fe2(MoO4)3 and Fe2(MoO4)3/CaSiO3 and with Mg and Zn molybdates. Practical implications – The pigments can be used for the formulation of paints intended for the corrosion protection of metals. The pigments also improve the paints’ physical properties. Originality/value – The use of the pigments in anticorrosion paints for the protection of metals is new. The benefits include the use and the procedure of synthesis of the anticorrosion pigments which are free from heavy metals and are acceptable from the aspect of environmental protection. Moreover, the core-shell molybdates, whose high efficiency is comparable to that of the stoichiometric molybdates, have lower molybdenum contents.

Synthesis and microstructure of conformal coatings on particulates

1997 ◽  
Vol 501 ◽  
Author(s):  
K. Rajan ◽  
P. Sajgalik ◽  
R. K. Singh ◽  
D. Kumar ◽  
J. Fitz-Gerald
Keyword(s):  
The Other ◽  
Core Shell ◽  
The Core ◽  
Crystallographic Characteristic ◽  
Synthesis Strategy ◽  
Conformal Coatings ◽  
Interface Structures ◽  
Individual Particles ◽  
Outer Coating

ABSTRACTIn this paper we present an overview of two very different approaches to the synthesis of composite particulates which result in a “core-shell” type structure. It is shown that both these synthesis approaches result in very characteristic interface structures between the outer coating and the host particles. One synthesis strategy is to use laser ablation deposition on individual particles and the other is to “coat” particles ‘in-situ’ by taking advantage of solid state diffusional transformations. Examination of the interface between the outer shell and the core of the particle shows that textured or toptactical growth occurs and it is suggested that this unique crystallographic characteristic may be responsible for the properties offered by these engineered particulates. The applications of such engineered particulates is also discussed.

Mechanical properties of Ge/Si core-shell nanowires under a uniaxial tension

2006 ◽  
Vol 958 ◽  
Author(s):  
Y. Yano ◽  
T. Nakajima ◽  
K. Shintani
Keyword(s):  
Mechanical Properties ◽  
Molecular Dynamics ◽  
Molecular Dynamics Simulation ◽  
Dynamics Simulation ◽  
Single Atom ◽  
Core Shell ◽  
The Core ◽  
Young’S Moduli ◽  
Vegard’S Law ◽  
Shell Nanowires

ABSTRACTThe mechanical properties of Si/Ge core-shell nanowires under a unixial tension are studied using molecular-dynamics simulation. The effects of anisotropy and the fraction of the core atoms on the Young's moduli of the core-shell nanowires are examined. The values of their Young's moduli deviate from those calculated using Vegard's law. Single atom chains are formed at the final stages of elongation of the nanowires.

Polyoxometalate-based metal–organic framework-derived bimetallic hybrid materials for upgraded electrochemical reduction of nitrogen

2020 ◽  
Vol 22 (18) ◽  
pp. 6157-6169 ◽  
Author(s):  
Xinming Wang ◽  
Zemin Feng ◽  
Boxin Xiao ◽  
Jingxiang Zhao ◽  
Huiyuan Ma ◽  
...  
Keyword(s):  
Hybrid Materials ◽  
Hybrid Material ◽  
Shell Structure ◽  
High Efficiency ◽  
Metal Organic Framework ◽  
Core Shell ◽  
Ambient Conditions ◽  
The Core ◽  
Metal Organic ◽  
Core Shell Structure

The core–shell structure of the Fe1.89Mo4.11O7/FeS2@C hybrid material exhibits high-efficiency electrocatalytic NRR activity and stability under ambient conditions.

GROWTH AND CHARACTERIZATION OF SILICON CARBIDE NANOWIRES

2004 ◽  
Vol 11 (04n05) ◽  
pp. 373-378 ◽  
Author(s):  
BYOUNGTAE PARK ◽  
YONGHWAN RYU ◽  
KIJUNG YONG
Keyword(s):  
Hydrofluoric Acid ◽  
Carbothermal Reduction ◽  
Direct Synthesis ◽  
Synthesis Method ◽  
Core Shell ◽  
The Core ◽  
Sic Nanowires ◽  
Solid Liquid ◽  
Shell Nanowires

A simple, direct synthesis method was used to grow the core-shell SiC - SiOx nanowires by heating the NiO catalyzed silicon substrate. The carbothermal reduction of WO3 by C provided a reductive environment to synthesize the crystalline SiC nanowires covered with the SiO x sheath in the growth temperature of 1000–1100°C. After hydrofluoric acid (HF) etching, the cubic β- SiC nanowires were extracted from the core-shell nanowires in large quantities. A solid-liquid-solid (SLS) mechanism was proposed for the growth of the core-shell SiC - SiO x nanowires.

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