Morphology-controlled synthesis of monodispersed graphitic carbon coated core/shell structured Ni/NiO nanoparticles with enhanced magnetoresistance

2015 ◽  
Vol 17 (48) ◽  
pp. 32398-32412 ◽  
Author(s):  
M. Patange ◽  
S. Biswas ◽  
A. K. Yadav ◽  
S. N. Jha ◽  
D. Bhattacharyya
Keyword(s):  
Magnetic Properties ◽  
Sol Gel ◽  
Graphitic Carbon ◽  
Core Shell ◽  
Controlled Synthesis ◽  
Nio Nanoparticles ◽  
Precursor Method ◽  
Carbon Coated

Graphitic carbon coated core/shell structured Ni/NiO nanoparticles were synthesized by a sol–gel type chemical precursor method and their structural, morphological and magnetic properties were evaluated.

Synthesis and Magnetic Properties of FePt Nanoparticles with Hard Nonmagnetic Shells

2007 ◽  
Vol 7 (1) ◽  
pp. 350-355 ◽  
Author(s):  
Shishou Kang ◽  
Shifan Shi ◽  
G. X. Miao ◽  
Zhiyong Jia ◽  
David E. Nikles ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Crystallographic Orientation ◽  
Sol Gel ◽  
Molar Ratio ◽  
Core Shell ◽  
Fept Nanoparticles ◽  
Shell Nanoparticles ◽  
Spherical Core ◽  
Size And Morphology ◽  
Core Shell Nanoparticles

Chemically synthesized FePt nanoparticles were coated with nonmagnetic SiO2 and MnO shells by sol–gel and polyol processes. TEM images show that the FePt/SiO2 nanoparticles exhibit a thick spherical shell. The size and morphology of the MnO shell can be controlled by changing the reaction temperature, the molar ratio of surfactants/Mn(acac)2, and/or the concentration of precursor. The morphology of the MnO shell can be either spherical-like or cubic-like, depending on whether the molar ratio of surfactants/Mn(acac)2 is less than or larger than 2. From XRD measurements, the spherical core/shell nanoparticles exhibit 3D random crystallographic orientation, while the cubic core/shell nanoparticles prefer (200) texture. The magnetic moment of FePt particles can be enhanced by coating with SiO2 and MnO shells. Furthermore, the agglomeration of FePt particles upon the thermal annealing can be significantly inhibited with SiO2 and MnO shells.

scholarly journals High Photocatalytic Activity of Fe3O4-SiO2-TiO2Functional Particles with Core-Shell Structure

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Chenyang Xue ◽  
Qiang Zhang ◽  
Junyang Li ◽  
Xiujian Chou ◽  
Wendong Zhang ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Photocatalytic Activity ◽  
Shell Structure ◽  
Sol Gel ◽  
High Photocatalytic Activity ◽  
Core Shell ◽  
Large Area ◽  
Uniform Size ◽  
Functional Nanoparticles ◽  
Core Shell Structure

This paper describes a novel method of synthesizing Fe3O4-SiO2-TiO2functional nanoparticles with the core-shell structure. The Fe3O4cores which were mainly superparamagnetic were synthesized through a novel carbon reduction method. The Fe3O4cores were then modified with SiO2and finally encapsulated with TiO2by the sol-gel method. The results of characterizations showed that the encapsulated 700 nm Fe3O4-SiO2-TiO2particles have a relatively uniform size distribution, an anatase TiO2shell, and suitable magnetic properties for allowing collection in a magnetic field. These magnetic properties, large area, relative high saturation intensity, and low retentive magnetism make the particles have high dispersibility in suspension and yet enable them to be recovered well using magnetic fields. The functionality of these particles was tested by measuring the photocatalytic activity of the decolouring of methyl orange (MO) and methylene blue (MB) under ultraviolet light and sunlight. The results showed that the introduction of the Fe3O4-SiO2-TiO2functional nanoparticles significantly increased the decoloration rate so that an MO solution at a concentration of 10 mg/L could be decoloured completely within 180 minutes. The particles were recovered after utilization, washing, and drying and the primary recovery ratio was 87.5%.

Proteic sol-gel synthesis, structure and magnetic properties of Ni/NiO core-shell powders

2018 ◽  
Vol 44 (6) ◽  
pp. 6152-6156 ◽  
Author(s):  
Rinaldo M. Silva ◽  
Rafael A. Raimundo ◽  
Willian V. Fernandes ◽  
Sandro M. Torres ◽  
Vinícius D. Silva ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Sol Gel ◽  
Core Shell ◽  
Sol Gel Synthesis

Size-controlled Synthesis and Magnetic Properties of FePt/PbS Core/Shell Nanoparticles

2016 ◽  
Vol 45 (1) ◽  
pp. 78-80 ◽  
Author(s):  
Shinpei Yamamoto ◽  
Yoshihiro Kusano
Keyword(s):  
Magnetic Properties ◽  
Core Shell ◽  
Controlled Synthesis ◽  
Shell Nanoparticles ◽  
Core Shell Nanoparticles ◽  
Size Controlled

Controlled Synthesis of Core-Shell Structure SiO2 /NaGdF4:Eu3+ Magnetic and Optical Bifunctional Composite

2014 ◽  
Vol 936 ◽  
pp. 359-363
Author(s):  
Yan Li Wu ◽  
Min Liao ◽  
Hai Xin Ding ◽  
Ru Chun Yang ◽  
Dan Dan Xiong ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Shell Structure ◽  
Photo Luminescence ◽  
Core Shell ◽  
Controlled Synthesis ◽  
X Ray Diffraction ◽  
X Ray ◽  
The Core ◽  
Core Shell Structure ◽  
Shell Composite

The SiO2/NaGdF4:Eu3+ core/shell composite was prepared by a template-mediated method, making monodispersed SiO2 as core and NaGdF4:Eu colloids as shell, the morphology and the core-shell structure of the resulting particles were analyzed by SEM,X-ray diffraction, and the photo-luminescence and magnetic properties of the microspheres were investigated too. The results shows the composite have great potential to be used as homogeneous magnetic/optical bifunctional material.

Controlled synthesis of V2O5/MWCNT core/shell hybrid aerogels through a mixed growth and self-assembly methodology for supercapacitors with high capacitance and ultralong cycle life

2015 ◽  
Vol 3 (30) ◽  
pp. 15692-15699 ◽  
Author(s):  
Yingjie Wu ◽  
Guohua Gao ◽  
Huiyu Yang ◽  
Wenchao Bi ◽  
Xing Liang ◽  
...  
Keyword(s):  
Self Assembly ◽  
Sol Gel ◽  
Three Dimensional ◽  
Cycle Life ◽  
Core Shell ◽  
Controlled Synthesis ◽  
One Pot ◽  
High Capacitance ◽  
Sol Gel Process ◽  
Hybrid Aerogels

Three-dimensional V2O5/MWCNT core/shell hybrid aerogels were controllably synthesized through a mixed growth and self-assembly methodology in a one-pot sol–gel process.

Microstructural and magnetic properties of core-shell FeSiAl composites with Ni0.4Zn0.45Co0.15Fe2O4 layer by sol-gel method

2021 ◽  
pp. 167774
Author(s):  
Jianchuan Chen ◽  
Haishan Guo ◽  
Xiaoxi Zhong ◽  
Jiayu Fu ◽  
Shengjiang Huang ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Sol Gel ◽  
Core Shell ◽  
Gel Method ◽  
Sol Gel Method

Synthesis and magnetic properties of carbon-coated Ni/SiO2 core/shell nanocomposites

2009 ◽  
Vol 52 (1) ◽  
pp. 31-34 ◽  
Author(s):  
NuJiang Tang ◽  
LiYa Lü ◽  
Wei Zhong ◽  
ChakTong Au ◽  
YouWei Du
Keyword(s):  
Magnetic Properties ◽  
Core Shell ◽  
Carbon Coated

scholarly journals Abstract P-8:Fe2O3-SiO2-Au Core-Shell Nanoparticles for Theranostics

2021 ◽  
Vol 11 (Suppl_1) ◽  
pp. S14-S14
Author(s):  
Vadim Samardak ◽  
Mukhamad Sobirov ◽  
Aleksei Ognev ◽  
Alexander Samardak ◽  
Thomas Koo ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Coercive Force ◽  
Magnetic Measurements ◽  
Sol Gel ◽  
Magnetic Core ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Au Nps ◽  
Two Samples ◽  
Core Shell Nanoparticles

Background: Core-shell nanoparticles (NPs) Fe3O4-SiO2 covered with Au grains due to their unique magnetic, biological, optical and mechanical properties are promising nanostructured material especially in biomedical field. Magnetic core allows controlling the position of NPs, SiO2 shell makes them biocompatible and decrease magnetostatic interactions between them, and Au NPs on the surface allow creating additional matrix around them and using such systems as controlled nanocontainers in tasks of drug delivery, magnetic resonance imaging and target cancer cell therapy. Methods: Inner magnetic core of the NPs was synthesized using polyol method, a 3-step process which resulting in magnetite NPs with hydrophilic surface. Shell was made by covering Fe3O4 particles in surfactant and growing SiO2 on top of them by sol-gel method. Covering core-shell NPs with 3.5 nm Au seed grains using monosilane and their further growth to control diameter. Structural properties were studied using TEM and Dual Beam SEM. Magnetic properties were investigated using LakeShore VSM 7400 magnetometer. Results: Two samples with different concentration of Au NPs were investigated. SEM observations show that core-shell Fe3O4-SiO2 are spherical with average diameter of 200 nm and Au NPs with diameter of 15 nm are evenly dispersed on their surface. Magnetic measurements showed that different concentration of Au NPs results in different coercive forces of the sample. Decreasing the temperature to 77 K showed up to 6 times increase of coercive force and slight increase in magnetization. Conclusion: Biocompatible magnetic nanoparticles are critical advances in biomedical applications. In this work, we studied the morphology of the samples, demonstrated the change of coercive force of NPs with different Au concentration and investigated their magnetic properties in low temperatures.

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