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.

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.

Microstructure and magnetic properties of SiO2/FeCoNiSi0.25 high-entropy alloy with a core/shell structure

2021 ◽  
Vol 290 ◽  
pp. 129399
Author(s):  
Shaofeng Yang ◽  
Jianan Wen ◽  
Fangyang Zhang ◽  
Jingyi Xie ◽  
Jiao Mo ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Shell Structure ◽  
High Entropy Alloy ◽  
Core Shell ◽  
High Entropy ◽  
Core Shell Structure ◽  
Microstructure And Magnetic Properties

Characterization of Fe3O4@CS@NMDP magnetic nanoparticles with core–shell structure prepared by chemical cross-linking method

2017 ◽  
Vol 10 (05) ◽  
pp. 1750056 ◽  
Author(s):  
Huiping Shao ◽  
Jiangcong Qi ◽  
Tao Lin ◽  
Yuling Zhou ◽  
Fucheng Yu
Keyword(s):  
Magnetic Nanoparticles ◽  
Shell Structure ◽  
High Performance ◽  
Cross Linking ◽  
Composite Particles ◽  
Core Shell ◽  
The Core ◽  
Targeting Delivery ◽  
Core Shell Structure ◽  
Chemical Cross Linking

The core–shell structure composite magnetic nanoparticles (NPs), Fe3O4@chitosan@nimodipine (Fe3O4@CS@NMDP), were successfully synthesized by a chemical cross-linking method in this paper. NMDP is widely used for cardiovascular and cerebrovascular disease prevention and treatment, while CS is of biocompatibility. The composite particles were characterized by an X-ray diffractometer (XRD), a Fourier transform infrared spectroscopy (FT-IR), a transmission electron microscopy (TEM), a vibrating sample magnetometers (VSM) and a high performance liquid chromatography (HPLC). The results show that the size of the core–shell structure composite particles is ranging from 12[Formula: see text]nm to 20[Formula: see text]nm and the coating thickness of NMDP is about 2[Formula: see text]nm. The saturation magnetization of core–shell composite NPs is 46.7[Formula: see text]emu/g, which indicates a good potential application for treating cancer by magnetic target delivery. The release percentage of the NMDP can reach 57.6% in a short time of 20[Formula: see text]min in the PBS, and to 100% in a time of 60[Formula: see text]min, which indicates the availability of Fe3O4@CS@NMDP composite NPs for targeting delivery treatment.

Preparation and magnetic properties of SrFe12O19/SiO2 nanocomposites with core–shell structure

2007 ◽  
Vol 61 (11-12) ◽  
pp. 2187-2190 ◽  
Author(s):  
Wuyou Fu ◽  
Haibin Yang ◽  
Qingjiang Yu ◽  
Jing Xu ◽  
Xiaofen Pang ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Shell Structure ◽  
Core Shell ◽  
Sio2 Nanocomposites ◽  
Core Shell Structure

Novel core-shell structure polyacrylamide-coated magnetic nanoparticles synthesized via photochemical polymerization

2006 ◽  
Vol 201 (1-2) ◽  
pp. 250-254 ◽  
Author(s):  
Hanwen Sun ◽  
Jun Hong ◽  
Fanzong Meng ◽  
Peijun Gong ◽  
Jiahui Yu ◽  
...  
Keyword(s):  
Magnetic Nanoparticles ◽  
Shell Structure ◽  
Core Shell ◽  
Photochemical Polymerization ◽  
Core Shell Structure

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%.

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