scholarly journals Coupled hard–soft spinel ferrite-based core–shell nanoarchitectures: magnetic properties and heating abilities

2020 ◽  
Vol 2 (8) ◽  
pp. 3191-3201 ◽  
Author(s):  
Marco Sanna Angotzi ◽  
Valentina Mameli ◽  
Claudio Cara ◽  
Anna Musinu ◽  
Claudio Sangregorio ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Shell Thickness ◽  
Spinel Ferrite ◽  
Magnetic Core ◽  
Core Shell ◽  
Core Size ◽  
Shell Nanostructures

The heating abilities of bi-magnetic core–shell nanostructures are studied depending on core size, nature of the shell, and shell thickness.

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.

Magnetic Properties of Fe3O4/CoFe2O4 Composite Nanoparticles with Core/Shell Architecture

2020 ◽  
Vol 65 (10) ◽  
pp. 904
Author(s):  
V. O. Zamorskyi ◽  
Ya. M. Lytvynenko ◽  
A. M. Pogorily ◽  
A. I. Tovstolytkin ◽  
S. O. Solopan ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Spinel Ferrite ◽  
Composite Nanoparticles ◽  
Core Shell ◽  
Cofe2o4 Nanoparticles ◽  
Core Diameter ◽  
The Core ◽  
Shell Particles ◽  
Interface Parameters ◽  
Shell Composite

Magnetic properties of the sets of Fe3O4(core)/CoFe2O4(shell) composite nanoparticles with a core diameter of about 6.3 nm and various shell thicknesses (0, 1.0, and 2.5 nm), as well as the mixtures of Fe3O4 and CoFe2O4 nanoparticles taken in the ratios corresponding to the core/shell material contents in the former case, have been studied. The results of magnetic research showed that the coating of magnetic nanoparticles with a shell gives rise to the appearance of two simultaneous effects: the modification of the core/shell interface parameters and the parameter change in both the nanoparticle’s core and shell themselves. As a result, the core/shell particles acquire new characteristics that are inherent neither to Fe3O4 nor to CoFe2O4. The obtained results open the way to the optimization and adaptation of the parameters of the core/shell spinel-ferrite-based nanoparticles for their application in various technological and biomedical domains.

scholarly journals Exchange-biased hybrid γ-Fe2O3/NiO core–shell nanostructures: three-step synthesis, microstructure, and magnetic properties

2019 ◽  
Vol 21 (22) ◽  
pp. 11967-11976 ◽  
Author(s):  
Xue-Min He ◽  
Chuang-Wei Zhang ◽  
Fang-Fang Guo ◽  
Shi-Ming Yan ◽  
Yong-Tao Li ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Core Shell ◽  
Synthetic Process ◽  
Shell Nanostructures ◽  
Microstructure And Magnetic Properties

The synthetic process of γ-Fe2O3/NiO core–shell nanostructures.

Synthesis of Core–Shell Nanostructures of Co3O4@SiO2 with Controlled Shell Thickness (5–20 nm) and Hollow Shells of Silica

2011 ◽  
Vol 11 (4) ◽  
pp. 3405-3413 ◽  
Author(s):  
Sonalika Vaidya ◽  
Pallavi Thaplyal ◽  
K. V. Ramanujachary ◽  
S. E. Lofland ◽  
Ashok K. Ganguli
Keyword(s):  
Shell Thickness ◽  
Core Shell ◽  
Shell Nanostructures ◽  
20 Nm

Facile one-step synthesis of plasmonic/magnetic core/shell nanostructures and their multifunctionality

2012 ◽  
Vol 22 (21) ◽  
pp. 10779 ◽  
Author(s):  
Yunxia Zhang ◽  
Hualin Ding ◽  
Yanyan Liu ◽  
Shusheng Pan ◽  
Yuanyuan Luo ◽  
...  
Keyword(s):  
Magnetic Core ◽  
Core Shell ◽  
Shell Nanostructures ◽  
One Step

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.

Formation of bismuth iron oxide based core–shell structures and their dielectric, ferroelectric and magnetic properties

2019 ◽  
Vol 7 (5) ◽  
pp. 1280-1291 ◽  
Author(s):  
Alaka Panda ◽  
R. Govindaraj ◽  
R. Mythili ◽  
G. Amarendra
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Magnetic Properties ◽  
Iron Oxide ◽  
Shell Structures ◽  
Core Shell ◽  
Bismuth Iron Oxide ◽  
The Core ◽  
Shell Nanostructures ◽  
Transmission Electron

Bismuth and iron oxides subjected to ball milling followed by controlled annealing treatments showed the formation of core–shell nanostructures with Bi2Fe4O9 as the core and a shell of BiFeO3 and Bi25FeO40 phases as deduced based on the analysis of transmission electron microscopy results.

Effect of silica shell thickness of Fe3O4–SiOx core–shell nanostructures on MRI contrast

2013 ◽  
Vol 15 (3) ◽  
Author(s):  
Hrushikesh M. Joshi ◽  
Mrinmoy De ◽  
Felix Richter ◽  
Jiaqing He ◽  
P. V. Prasad ◽  
...  
Keyword(s):  
Shell Thickness ◽  
Silica Shell ◽  
Core Shell ◽  
Mri Contrast ◽  
Shell Nanostructures
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