Synthesis and magnetic properties of core-shell structured (NiCo)O(AFM)-NiCo(FM) magnetic nanoparticles

2002 ◽  
Vol 38 (5) ◽  
pp. 2595-2597 ◽  
Author(s):  
B. Jeyadevan ◽  
C.N. Chinnasamy ◽  
O. Perales-Perez ◽  
Y. Iwasaki ◽  
A. Hobo ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Nanoparticles ◽  
Core Shell

scholarly journals Magnetic Nanoparticles: Co@SiO2, Co@Au and Co@Pt

2017 ◽  
Vol 36 (4) ◽  
pp. 01 ◽  
Author(s):  
Vagner Sargentelli ◽  
Antônio A. P. Ferreira
Keyword(s):  
Magnetic Properties ◽  
Magnetic Nanoparticles ◽  
Shell Structures ◽  
Human Organism ◽  
Core Shell ◽  
Present Moment ◽  
Metallic Oxides ◽  
The Core ◽  
Structure Changes ◽  
And Control

Nanotechnology is the understanding and control f matter at dimensions of roughly 1 – 100 nm. At the nanoscale, the properties like electrical conductivity and mechanical strength are not the same as the materials with particles in dimensions much more than 100 nm. The electronic structure changes dramatically too. Between nanomaterials, there is recently a great number of works that investing as the synthesis as the properties of the magnetic nanoparticles. The interest in these materials is due to its magnetic applications. Some of more representative magnetic materials are the metallic oxides, as some ferrites. However, the ferrites are often obtained as mixture of some oxides, which implies that the magnetic properties are not always well defined and reproducible. Thus, the researches has been turned to use of the magnetic metals, between which the cobalt. The cobalt is investigated because its high magnetic susceptility. However, this transition metal is easily oxidate in air and is toxic to human organism. For this reason, it has looked for to effect synthesis involving core – shell structures, which no to allow the oxidation of the cobalt and prevent against its toxicity. Between the shells that come being obtained it is of silica and of gold. In addition, in if treating to catalysis in a general way, the price of the cobalt and its magnetic properties are adjusted for the attainment core – shell catalysts, Cocore@Ptshell, (Co@Pt). So, the aim of this article is to present and to do an analysis of the more representative synthetic route used until the present moment to obtain the core – shell structures: Co@SiO2, Co@Au and Co@Pt.

Fabrication and evaluation of molecularly imprinted magnetic nanoparticles for selective recognition and magnetic separation of lysozyme in human urine

The Analyst ◽  
2018 ◽  
Vol 143 (23) ◽  
pp. 5849-5856 ◽  
Author(s):  
Zulei Zhang ◽  
Hongmei Wang ◽  
Hailong Wang ◽  
Cuichen Wu ◽  
Mengli Li ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Nanoparticles ◽  
Magnetic Separation ◽  
Human Urine ◽  
Shell Structure ◽  
Good Stability ◽  
Selective Recognition ◽  
Core Shell ◽  
Molecularly Imprinted ◽  
Core Shell Structure

The Lyz-MMIPs displayed a uniform core–shell structure, favorable magnetic properties, good accessibility, and good stability and had a good affinity and excellent binding selectivity to Lyz.

Fabrication of core–shell CoFe2O4@HAp nanoparticles: a novel magnetic platform for biomedical applications

2019 ◽  
Vol 43 (34) ◽  
pp. 13584-13593 ◽  
Author(s):  
D. Karthickraja ◽  
S. Karthi ◽  
G. A. Kumar ◽  
D. K. Sardar ◽  
G. C. Dannangoda ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Nanoparticles ◽  
Biomedical Applications ◽  
Hydrothermal Process ◽  
Core Shell

Biocompatible core–shell CoFe2O4@HAp magnetic nanoparticles were successfully prepared by a simple two-step hydrothermal process, and their physicochemical and magnetic properties were studied.

scholarly journals Magnetic Nanoparticles with Core Shell: Macroscopic Model and Coercive Field

2010 ◽  
Vol 2010 ◽  
pp. 1-6 ◽  
Author(s):  
O. Hudak ◽  
M. Hudak
Keyword(s):  
Magnetic Properties ◽  
Magnetic Nanoparticles ◽  
Shell Structure ◽  
Coercive Field ◽  
Macroscopic Model ◽  
Core Shell ◽  
Qualitative Explanation ◽  
The Core ◽  
Core Shell Structure ◽  
Nonhomogeneous Structure

There exists nonhomogeneous structure in mechanosynthesized nanoparticles consisting of an ordered core surrounded by the shell. The shell may be structurally and magnetically disordered, or it may be ordered. These nanoparticles are found to be roughly spherical. We formulate the macroscopic model for the description of magnetic properties of nanoparticles with core-shell structure. The case of spheroids oriented in the same direction of polar axes is considered. There exits two coercive fields:HcγandHcψ. They are depending on quantitiesoandx, wherex=V2/(V1−2V2), ando=IF/IS, hereV1is the volume of the nanoparticle, andV2is the volume of the core.IFis the magnetization of the core, andISis the magnetization of the shell. There exists a transition from one type of the coercive field to another, changingxando. We have found qualitative explanation of observed enhancement of coercive field and of itsd-dependence inNiFe2O4nanoparticles.

Enhanced magnetic properties and MRI performance of bi-magnetic core–shell nanoparticles

RSC Advances ◽  
2016 ◽  
Vol 6 (81) ◽  
pp. 77558-77568 ◽  
Author(s):  
Fernando Arteaga Cardona ◽  
Esmeralda Santillán Urquiza ◽  
Patricia de la Presa ◽  
Silvia Hidalgo Tobón ◽  
Umapada Pal ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Nanoparticles ◽  
Contrast Agents ◽  
Magnetic Core ◽  
Mri Contrast Agents ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Mri Contrast ◽  
Core Shell Nanoparticles

Two sets of bi-magnetic, biocompatible Zn0.5Mn0.5Fe2O4@Fe3O4 core–shell nanoparticles with enhanced magnetic properties were prepared. These bi-magnetic nanoparticles have a vast potential as MRI contrast agents.

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.

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