Ultrafine magnetic particles dispersed in silica: Characterization of cobalt iron citrate precursor and magnetic properties

2008 ◽  
Vol 43 (5) ◽  
pp. 1112-1118 ◽  
Author(s):  
Sagrario M. Montemayor ◽  
L.A. García-Cerda ◽  
J.R. Torres-Lubián ◽  
O.S. Rodríguez-Fernández
Keyword(s):  
Magnetic Properties ◽  
Magnetic Particles ◽  
Iron Citrate ◽  
Cobalt Iron ◽  
Citrate Precursor

Adsorption of Iron (II) Ion by Using Magnetite-Bentonite-Based Monolith from Water

2021 ◽  
Vol 892 ◽  
pp. 10-16
Author(s):  
Ismi Nurul ◽  
Syamsuddin Yanna ◽  
Adisalamun ◽  
Aulia Sugianto Veneza ◽  
Darmadi
Keyword(s):  
Magnetic Properties ◽  
Magnetic Particles ◽  
Solution Concentration ◽  
Iron Solution ◽  
Monolayer Adsorption ◽  
Coprecipitation Process ◽  
Non Linear ◽  
Magnetic Loading ◽  
Langmuir Constants

In this study, iron removal was carried out by the adsorption process as a well-known method of removing heavy metal. Natural bentonite with magnetic properties in a monolithic form or Magnetite-Bentonite-based Monolith (MBM) adsorbent was used as an adsorbent to remove Iron (II) ion from the aqueous solution. The magnetic properties of adsorbents are obtained by adding magnetite (Fe3O4), which is synthesized by the coprecipitation process. The characterization of magnetic properties was performed using the Vibrating Sample Magnetometer (VSM). VSM results showed that the magnetic particles were ferromagnetic. Adsorption efficiency, isotherm model, and adsorption kinetics were investigated in a batch system with iron solution concentration varied from 2 to 10 mg/L and magnetite loading at 2% and 5% w/w. The highest removal efficiency obtained reached 89% with a 5% magnetite loading. The best fit to the data was obtained with the Langmuir isotherm (non-linear) with maximum monolayer adsorption capacity (Qo) at 5% magnetic loading MBM adsorbent is 0.203 mg/g with Langmuir constants KL and aL are 2.055 L/g and 10.122 L/mg respectively. The pseudo-first-order (non-linear) kinetic model provides the best correlation of the experimental data with the rate of adsorption (k1) with magnetite loading 2% and 5%, respectively are 0.024 min-1 and 0.022 min-1.

Formation and Magnetic Characterization of Magnesium Oxide / Iron Nano Composite Particles

2011 ◽  
Vol 236-238 ◽  
pp. 1927-1930
Author(s):  
Yuan Yuan Kong ◽  
Hao Zhou
Keyword(s):  
Magnetic Properties ◽  
Magnetic Particles ◽  
Drug Carriers ◽  
Spherical Particles ◽  
Reactant Ratio ◽  
Nano Composite ◽  
Future Drug ◽  
Micro Morphology

Nano-sized composite magnetic particles MgO /Fe were in-situ combustion synthesized at 620°Cfor the Mg-70.9wt%Fe3O4 system. In this paper, we discussed the reactant ratio on the influence of micro-morphology and the magnetic properties of nanoparticles. It was indentified that: Mg(29.1wt%) was the suitable reactant ratio, the sintered composite spherical particles with mean diameter 40nm distributed evenly, particles had good soft magnetic properties, and it was the future drug carriers materials.

AEM analysis of crystallization in Ti-based amorphous alloys

1983 ◽  
Vol 41 ◽  
pp. 270-271
Author(s):  
A.R. Pelton ◽  
A.F. Marshall ◽  
Y.S. Lee
Keyword(s):  
Magnetic Properties ◽  
Amorphous Alloys ◽  
Amorphous Materials ◽  
Isothermal Annealing ◽  
Amorphous Matrix ◽  
Nucleation And Growth ◽  
Current Interest ◽  
Amorphous Films ◽  
Electrical And Magnetic Properties

Amorphous materials are of current interest due to their desirable mechanical, electrical and magnetic properties. Furthermore, crystallizing amorphous alloys provides an avenue for discerning sequential and competitive phases thus allowing access to otherwise inaccessible crystalline structures. Previous studies have shown the benefits of using AEM to determine crystal structures and compositions of partially crystallized alloys. The present paper will discuss the AEM characterization of crystallized Cu-Ti and Ni-Ti amorphous films.Cu60Ti40: The amorphous alloy Cu60Ti40, when continuously heated, forms a simple intermediate, macrocrystalline phase which then transforms to the ordered, equilibrium Cu3Ti2 phase. However, contrary to what one would expect from kinetic considerations, isothermal annealing below the isochronal crystallization temperature results in direct nucleation and growth of Cu3Ti2 from the amorphous matrix.

scholarly journals Green synthesis and characterization of hexaferrite strontium-perovskite strontium photocatalyst nanocomposites

2020 ◽  
Vol 43 (1) ◽  
pp. 26-42 ◽  
Author(s):  
Zahra Hajian Karahroudi ◽  
Kambiz Hedayati ◽  
Mojtaba Goodarzi
Keyword(s):  
Magnetic Properties ◽  
Green Synthesis ◽  
Sol Gel ◽  
Synthesis Method ◽  
Combustion Method ◽  
Lemon Juice ◽  
X Ray Diffraction ◽  
X Ray ◽  
Auto Combustion

AbstractThis study presents a preparation of SrFe12O19– SrTiO3 nanocomposite synthesis via the green auto-combustion method. At first, SrFe12O19 nanoparticles were synthesized as a core and then, SrTiO3 nanoparticles were prepared as a shell for it to manufacture SrFe12O19–SrTiO3 nanocomposite. A novel sol-gel auto-combustion green synthesis method has been used with lemon juice as a capping agent. The prepared SrFe12O19–SrTiO3 nanocomposites were characterized by using several techniques to characterize their structural, morphological and magnetic properties. The crystal structures of the nanocomposite were investigated via X-ray diffraction (XRD). The morphology of SrFe12O19– SrTiO3 nanocomposite was studied by using a scanning electron microscope (SEM). The elemental composition of the materials was analyzed by an energy-dispersive X-ray (EDX). Magnetic properties and hysteresis loop of nanopowder were characterized via vibrating sample magnetometer (VSM) in the room temperature. Fourier transform infrared spectroscopy (FTIR) spectra of the samples showed the molecular bands of nanoparticles. Also, the photocatalytic behavior of nanocomposites has been checked by the degradation of azo dyes under irradiation of ultraviolet light.

Structure Characterization of Amorphous CoxGd1−x Nanowires and Magnetic Properties of Their Arrays

2009 ◽  
Vol 113 (39) ◽  
pp. 16934-16938 ◽  
Author(s):  
S. Y. Liu ◽  
A. K. Soh ◽  
L. Hong ◽  
L. Lu
Keyword(s):  
Magnetic Properties ◽  
Structure Characterization

scholarly journals Preparation and Characterization of Magnetic Chitosan Microcapsules

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Xiaopeng Xiong ◽  
Yong Wang ◽  
Weiwei Zou ◽  
Jiangjiang Duan ◽  
Yun Chen
Keyword(s):  
Magnetic Properties ◽  
Strong Interaction ◽  
Liquid Paraffin ◽  
Hollow Microspheres ◽  
Composite Particles ◽  
Cross Link ◽  
Magnetic Chitosan ◽  
Starting Solution ◽  
Dense Shell

By dispersing aqueous precipitant in liquid paraffin to prepare a W/O emulsion then adding chitosan (CS) solution, CS microcapsules have been successfully prepared. It is a facile way to prepare polymer microcapsules by using aqueous precipitant or nonsolvent as template, which avoids the removal of template and would free from the necessity to cross-link the microcapsule as usual methods to directly form dense shell. The hollow feature of the obtained materials is revealed. The diameter of the microcapsules ranges from severalμm to over 100 μm. Magnetic CS microcapsules have been prepared in this way when Fe3+and Fe2+were mixed with CS to prepare a mixture starting solution. The appearance and microstructure of the composite microcapsules were studied. The results indicate that the formed Fe3O4nanoparticles are embedded in the CS matrix evenly due to strong interaction between the Fe3O4nanoparticles and the CS molecules. The Fe3O4content and the magnetic properties of the composite microcapsule were measured. The composite microcapsules were calcined in air at 700°C to prepare pure inorganic hollow microspheres. It is general to prepare hollow polymeric or composite particles by using this method.

Electrochemical and spectroelectrochemical characterization of newly synthesized manganese, cobalt, iron and copper phthalocyanines

2013 ◽  
Vol 87 ◽  
pp. 554-566 ◽  
Author(s):  
Mürsel Arıcı ◽  
Duygu Arıcan ◽  
Ahmet Lütfi Uğur ◽  
Ali Erdoğmuş ◽  
Atıf Koca
Keyword(s):  
Cobalt Iron ◽  
Copper Phthalocyanines
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