Characterization of as-synthesized FeCo magnetic nanoparticles by coprecipitation method

2013 ◽  
Vol 113 (17) ◽  
pp. 17A313 ◽  
Author(s):  
Jinu Kim ◽  
Jinbae Kim ◽  
Jongryoul Kim ◽  
Ki Hyeon Kim
Keyword(s):  
Magnetic Nanoparticles ◽  
Coprecipitation Method

Effect of Temperature on Fe3O4 Magnetic Nanoparticles Prepared by Coprecipitation Method

2014 ◽  
Vol 900 ◽  
pp. 172-176 ◽  
Author(s):  
Ji Mei Niu ◽  
Zhi Gang Zheng
Keyword(s):  
Magnetic Nanoparticles ◽  
Coprecipitation Method ◽  
Effect Of Temperature ◽  
Vibrating Sample Magnetometer ◽  
X Ray Diffraction ◽  
X Ray ◽  
Magnetic Carriers ◽  
Average Grain Size ◽  
Or Gene ◽  
Block Temperature

The Fe3O4 magnetic nanoparticles obtained by the aqueous coprecipitation method are characterized systematically using scanning electron microscope, X-ray diffraction and vibrating sample magnetometer. These magnetic nanoparticles are spheric, dispersive, and have average grain size of 50 nm. The size and magnetic properties of Fe3O4 nanoparticles can be tuned by the reaction temperature. All samples exhibit high saturation magnetization (Ms=53.4 emu·g-1) and superparamagnetic behavior with a block temperature (TB) of 215K. These properties make such Fe3O4 magnetic nanoparticles worthy candidates for the magnetic carriers of targeted-drug or gene therapy in future.

scholarly journals Adsorption Studies on Magnetic Nanoparticles Functionalized with Silver to Remove Nitrates from Waters

Water ◽  
2021 ◽  
Vol 13 (13) ◽  
pp. 1757
Author(s):  
Yesica Vicente-Martínez ◽  
Manuel Caravaca ◽  
Antonio Soto-Meca ◽  
Miguel Ángel Martín-Pereira ◽  
María del Carmen García-Onsurbe
Keyword(s):  
Magnetic Nanoparticles ◽  
Nitrate Content ◽  
Adsorption Efficiency ◽  
Experimental Conditions ◽  
Dependent Behavior ◽  
Before And After ◽  
Naoh Solution ◽  
High Concentrations ◽  
Interference Studies

This paper presents a novel procedure for the treatment of contaminated water with high concentrations of nitrates, which are considered as one of the main causes of the eutrophication phenomena. For this purpose, magnetic nanoparticles functionalized with silver (Fe3O4@AgNPs) were synthesized and used as an adsorbent of nitrates. Experimental conditions, including the pH, adsorbent and adsorbate dose, temperature and contact time, were analyzed to obtain the highest adsorption efficiency for different concentration of nitrates in water. A maximum removal efficiency of 100% was reached for 2, 5, 10 and 50 mg/L of nitrate at pH = 5, room temperature, and 50, 100, 250 and 500 µL of Fe3O4@AgNPs, respectively. The characterization of the adsorbent, before and after adsorption, was performed by energy dispersive X-ray spectroscopy, scanning electron microscopy, Brunauer-Emmett-Teller analysis and Fourier-transform infrared spectroscopy. Nitrates can be desorbed, and the adsorbent can be reused using 500 µL of NaOH solution 0.01 M, remaining unchanged for the first three cycles, and exhibiting 90% adsorption efficiency after three regenerations. A deep study on equilibrium isotherms reveals a pH-dependent behavior, characterized by Langmuir and Freundlich models at pH = 5 and pH = 1, respectively. Thermodynamic studies were consistent with physicochemical adsorption for all experiments but showed a change from endothermic to exothermic behavior as the temperature increases. Interference studies of other ions commonly present in water were carried out, enabling this procedure as very selective for nitrate ions. In addition, the method was applied to real samples of seawater, showing its ability to eliminate the total nitrate content in eutrophized waters.

scholarly journals Production and characterization of chitooligosaccharides by the fungal chitinase Chit42 immobilized on magnetic nanoparticles and chitosan beads: selectivity, specificity and improved operational utility

RSC Advances ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 5529-5536
Author(s):  
Peter E. Kidibule ◽  
Jessica Costa ◽  
Andrea Atrei ◽  
Francisco J. Plou ◽  
Maria Fernandez-Lobato ◽  
...  
Keyword(s):  
Magnetic Nanoparticles ◽  
Industrial Application ◽  
Chitosan Beads

Chitin-active enzymes are of great biotechnological interest due to the wide industrial application of chitinolytic materials.

Curcuminoids-conjugatiked multicore magnetic nanoparticles: design and characterization of a potential theranostic nanoplatform

2021 ◽  
pp. 160448
Author(s):  
Evelyn C.S. Santos ◽  
Jamili A. Cunha ◽  
Marcel G. Martins ◽  
Bianca M. Galeano-Villar ◽  
Richard J. Caraballo-Vivas ◽  
...  
Keyword(s):  
Magnetic Nanoparticles

scholarly journals Low temperature solventless synthesis and characterization of Ni and Fe magnetic nanoparticles

2012 ◽  
Vol 48 (66) ◽  
pp. 8237 ◽  
Author(s):  
Liis Seinberg ◽  
Shinpei Yamamoto ◽  
Ruwan Gallage ◽  
Masahiko Tsujimoto ◽  
Yoji Kobayashi ◽  
...  
Keyword(s):  
Magnetic Nanoparticles ◽  
Low Temperature ◽  
Synthesis And Characterization ◽  
Solventless Synthesis
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