scholarly journals Novel magnetic core–shell Ce–Ti@Fe3O4 nanoparticles as an adsorbent for water contaminants removal

RSC Advances ◽  
2016 ◽  
Vol 6 (62) ◽  
pp. 56913-56917 ◽  
Author(s):  
Ahmad A. Markeb ◽  
Laura A. Ordosgoitia ◽  
Amanda Alonso ◽  
Antoni Sánchez ◽  
Xavier Font
Keyword(s):  
Fe3o4 Nanoparticles ◽  
Magnetic Core ◽  
Core Shell ◽  
Experimental Conditions ◽  
Water Contaminants ◽  
Contaminants Removal ◽  
Cerium Titanate

Magnetic core–shell Ce–Ti@Fe3O4 nanoparticles were synthesized by coating cerium titanate on magnetite under mild experimental conditions.

scholarly journals Synthesis and Characterization of a Fe3O4@PNIPAM-Chitosan Nanocomposite and Its Potential Application in Vincristine Delivery

Polymers ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1704
Author(s):  
Cynthia N. Hernández-Téllez ◽  
Ana G. Luque-Alcaraz ◽  
Maribel Plascencia-Jatomea ◽  
Hiram J. Higuera-Valenzuela ◽  
Mabeth Burgos-Hernández ◽  
...  
Keyword(s):  
Fe3o4 Nanoparticles ◽  
Release Kinetics ◽  
Magnetic Core ◽  
Systematic Evaluation ◽  
Solution Temperature ◽  
Core Shell ◽  
Particle Size And Morphology ◽  
Size And Morphology ◽  
Thermomagnetic Properties ◽  
Release Model

In this research, we conducted a systematic evaluation of the synthesis parameters of a multi-responsive core-shell nanocomposite (Fe3O4 nanoparticles coated by poly(N-isopropylacrylamide) (PNIPAM) in the presence of chitosan (CS) (Fe3O4@PNIPAM-CS). Scanning electron microscopy (SEM) was used to follow the size and morphology of the nanocomposite. The functionalization and the coating of Fe3O4 nanoparticles (Nps) were evaluated by the ζ-potential evolution and Fourier Transform infrared spectroscopy (FTIR). The nanocomposite exhibited a collapsed structure when the temperature was driven above the lower critical solution temperature (LCST), determined by dynamic light scattering (DLS). The LCST was successfully shifted from 33 to 39 °C, which opens the possibility of using it in physiological systems. A magnetometry test was performed to confirm the superparamagnetic behavior at room temperature. The obtained systems allow the possibility to control specific properties, such as particle size and morphology. Finally, we performed vincristine sulfate loading and release tests. Mathematical analysis reveals a two-stage structural-relaxation release model beyond the LCST. In contrast, a temperature of 25 °C promotes the diffusional release model. As a result, a more in-depth comprehension of the release kinetics was achieved. The synthesis and study of a magnetic core-shell nanoplatform offer a smart material as an alternative targeted release therapy due to its thermomagnetic properties.

scholarly journals Study on Photodegradation Activity of Fe3O4@SiO2@TiO2-Ce/rGO Magnetic Photocatalyst

2021 ◽  
Author(s):  
Weiyan Cao ◽  
Liu Xijun ◽  
Wang Yuwei ◽  
Zhang Yong ◽  
Han Xianxin ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Sol Gel ◽  
Magnetic Core ◽  
Nano Composites ◽  
Core Shell ◽  
Magnetic Composite ◽  
Composite Nanomaterials ◽  
Experimental Conditions ◽  
Magnetic Photocatalyst ◽  
Composite Photocatalyst

Abstract The magnetic core-shell Fe3O4@SiO2@TiO2-Ce/rGO composite nanomaterials were prepared by sol-gel method and hydrothermal method, composite photocatalyst doped with metal and loaded with graphene, the catalytic activity has been greatly improved. Under normal experimental conditions (pH = 7, [MB] = 10mg/L, magnetic composite photocatalyst concentration = 0.1g/50mL), Fe3O4@SiO2@TiO2-Ce/rGO nano-composites photocatalyst maximum degrade MB reaches 98.2% in 140 minutes.

scholarly journals Novel magnetic core-shell polypyrrole-Fe3O4 nanoparticles functionalized by peptides or albumin

ARKIVOC ◽  
2010 ◽  
Vol 2010 (10) ◽  
pp. 185-198 ◽  
Author(s):  
Alexandrina Nan ◽  
Izabell Craciunescu ◽  
Rodica Turcu ◽  
Ioan Bratu ◽  
Cristian Leostean ◽  
...  
Keyword(s):  
Fe3o4 Nanoparticles ◽  
Magnetic Core ◽  
Core Shell

MAGNETIC CORE SHELL NANOPARTICLES CHARACTERIZED BY X-RAY ABSORPTION AND MAGNETIC CIRCULAR DICHROISM

2007 ◽  
Vol 21 (18) ◽  
pp. 1179-1187 ◽  
Author(s):  
KAI FAUTH
Keyword(s):  
Magnetic Circular Dichroism ◽  
Magnetic Core ◽  
Careful Consideration ◽  
Core Shell ◽  
Valuable Insight ◽  
Shell Nanoparticles ◽  
Experimental Conditions ◽  
X Ray ◽  
Spectroscopic Tool ◽  
X Ray Absorption

X-ray absorption spectroscopy is a powerful spectroscopic tool in analytical nanoscience. Its application to nanoparticles with core shell geometry requires careful consideration, in particular when quantitative evaluations are attempted. The present article shows that well chosen experimental conditions, supported by Monte Carlo simulations of X-ray absorption allow a detailed analysis of experimental data and provide valuable insight into magnetic properties of transition metal and alloy nanoparticles.

scholarly journals Fabrication of copper(II)-coated magnetic core-shell nanoparticles Fe3O4@SiO2-2-aminobenzohydrazide and investigation of its catalytic application in the synthesis of 1,2,3-triazole compounds

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
H. Rajabi-Moghaddam ◽  
M. R. Naimi-Jamal ◽  
M. Tajbakhsh
Keyword(s):  
High Efficiency ◽  
Click Reaction ◽  
Magnetic Core ◽  
Core Shell ◽  
Isatoic Anhydride ◽  
Shell Nanoparticles ◽  
Triazole Derivatives ◽  
Catalytic Application ◽  
Ft Ir ◽  
Core Shell Nanoparticles

AbstractIn the present work, an attempt has been made to synthesize the 1,2,3-triazole derivatives resulting from the click reaction, in a mild and green environment using the new copper(II)-coated magnetic core–shell nanoparticles Fe3O4@SiO2 modified by isatoic anhydride. The structure of the catalyst has been determined by XRD, FE-SEM, TGA, VSM, EDS, and FT-IR analyzes. The high efficiency and the ability to be recovered and reused for at least up to 6 consecutive runs are some superior properties of the catalyst.

scholarly journals Removal of Cd(II) from Micro-Polluted Water by Magnetic Core-Shell Fe3O4@Prussian Blue

Molecules ◽  
2021 ◽  
Vol 26 (9) ◽  
pp. 2497
Author(s):  
Xinxin Long ◽  
Huanyu Chen ◽  
Tijun Huang ◽  
Yajing Zhang ◽  
Yifeng Lu ◽  
...  
Keyword(s):  
Prussian Blue ◽  
Co Adsorption ◽  
Magnetic Core ◽  
Diameter Distribution ◽  
Polluted Water ◽  
Core Shell ◽  
Freundlich Model ◽  
Rate Limiting Step ◽  
Rate Limiting

A novel core-shell magnetic Prussian blue-coated Fe3O4 composites (Fe3O4@PB) were designed and synthesized by in-situ replication and controlled etching of iron oxide (Fe3O4) to eliminate Cd (II) from micro-polluted water. The core-shell structure was confirmed by TEM, and the composites were characterized by XRD and FTIR. The pore diameter distribution from BET measurement revealed the micropore-dominated structure of Fe3O4@PB. The effects of adsorbents dosage, pH, and co-existing ions were investigated. Batch results revealed that the Cd (II) adsorption was very fast initially and reached equilibrium after 4 h. A pH of 6 was favorable for Cd (II) adsorption on Fe3O4@PB. The adsorption rate reached 98.78% at an initial Cd (II) concentration of 100 μg/L. The adsorption kinetics indicated that the pseudo-first-order and Elovich models could best describe the Cd (II) adsorption onto Fe3O4@PB, indicating that the sorption of Cd (II) ions on the binding sites of Fe3O4@PB was the main rate-limiting step of adsorption. The adsorption isotherm well fitted the Freundlich model with a maximum capacity of 9.25 mg·g−1 of Cd (II). The adsorption of Cd (II) on the Fe3O4@PB was affected by co-existing ions, including Cu (II), Ni (II), and Zn (II), due to the competitive effect of the co-adsorption of Cd (II) with other co-existing ions.

scholarly journals Multifunktionale bakterielle Nanomagnete für Biotechnologie und Medizin

BIOspektrum ◽  
2021 ◽  
Vol 27 (4) ◽  
pp. 442-444
Author(s):  
Frank Mickoleit ◽  
Sabine Rosenfeldt ◽  
Anna S. Schenk ◽  
Dirk Schüler ◽  
René Uebe
Keyword(s):  
Particle Production ◽  
Magnetotactic Bacteria ◽  
Magnetic Core ◽  
High Yield ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Magnetospirillum Gryphiswaldense ◽  
Core Shell Nanoparticles ◽  
Genetic Toolkit ◽  
The Way

AbstractBacterial magnetosomes represent magnetic core-shell nanoparticles biomineralized by magnetotactic bacteria like Magnetospirillum gryphiswaldense. The establishment of fermentation regimes for high-yield particle production, standardized isolation procedures as well as the development of a genetic toolkit for the generation of “tailored” particles might soon pave the way for the application of engineered magnetosomes in the biomedical and biotechnological field.

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