Preparation Of Magnetic Iron Oxide Research Articles

Preparation of Magnetic Iron Oxide Incorporated Mesoporous Silica Hybrid Composites for pH and Temperature-Sensitive Drug Delivery

In clinical applications for cancer treatment, chemotherapy coupled with thermotherapy is highly considered. The development of multifunctional nanocomposite materials is an appealing strategy for use in various applications including biomedical applications. We present the preparation of dopamine-modified mesoporous silica material, in which magnetic iron oxide nanoparticles (FeNP) were grown onto the outer surface via the complexation of iron (Fe(III) and Fe(II)) ions with the dopamine groups modified on the silica hybrid and subsequent chemical reduction approaches. The prepared magnetic iron oxide incorporated with mesoporous silica hybrid composite nanoparticles (FeNP@MSHC NPs) had a large surface area (346 m2/g), pore size (3.2 nm), and pore volume (0.048 cm3/g). The formation of FeNP on the outer surface of the FeNP@MSHC NPs results in superparamagnetic characteristics. Furthermore, the prepared FeNP@MSHC NPs have a high drug (Dox) loading capacity (~62%) as well as pH- and temperature-responsive drug release efficiency. In addition, the MTT assay result shows the biocompatibility of the prepared FeNP@MSHC NPs. As a result, the FeNP@MSHC NPs could be utilized in cancer treatment for pH and temperature-sensitive delivery of chemotherapeutic agents to the target sites.

Preparation of magnetic iron Oxide coated on the surface of Cellulose nanocrystals by in-situ coprecipitation process

This study reported a single-step method for the fabrication of magnetic cellulose nanocrystals (MGCNCs) by coprecipitation iron oxide nanoparticle onto cellulose nanocrystals (CNCs). Cellulose nanocrystals (CNCs) were derived by hydrochloric acid hydrolysis (HCl 6 M, 25 mL/g cellulose) in the optimum condition at 90 °C for 90 min. Pure cellulose was isolated from Nypa fruticans branches, a popular tree in Vietnam. The structure and morphology of CNCs were characterized by crystallinity index, morphology and thermal stability. TEM images showed that the average fiber length of the nanocrystals was 410 nm with a diameter of 10 nm (aspect ratio of 41) and the crystallinity index of 85.2 % (by XRD). The as-prepared MGCNCs were characterized by Fourier transform infrared spectroscopy (FTIR), wide-angle X-ray diffraction measurement (XRD), thermal gravity analysis (TGA) and vibrating sample magnetometry (VSM). The results showed that the magnetic cellulose nanocrystals absorbed about 51 % w/w on CNCs surfaces with magnetic properties and the saturation magnetization of about 24 emu/g. Possessing the biocompatibility as well as paramagnetism, the magnetic cellulose nanocrystals were promising materials for environmental treatment.

Synthesis and Characteristics Nanocomposites of MCSHA and MHACS and Comparison of Adsorption of Methylene Blue with Adsorbents

In this research, magnetic iron oxide/chitosan/hydroxyapatite (MCSHA) and magnetic iron oxide/ hydroxyapatite/chitosan (MHACS) nanocomposites were synthesized and by two methods. Begin, the magnetic nanoparticles of iron oxide were prepared by applying iron 2 and iron 3 by co-precipitate. Then, in the first method, after making magnetic Iron Oxide, the magnetic Iron Oxide was combined with chitosan and finally synthesized with hydroxyapatite. In the 2th method, after the preparation of magnetic iron oxide, it was combined with hydroxyapatite and finally synthesized with chitosan. The adsorbents were characterized by Fourier transform infrared (FTIR) spectroscopy. With both adsorbents, the methylene blue dye removal did and separated adsorbed by a magnetic field external, and were compared by the ultraviolet- visible spectrophotometer. Then, the surface morphology and elemental analysis of the (MCSHA) were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD) pattern. Also, the magnetic field it was characterized by vibrating sample magnetometer (VSM) analysis. With regard to the percentage of removal above 1th method, it was used as an adsorbent magnetic iron oxide/chitosan/hydroxyapatite (MCSHA) to remove the methylene blue cationic dye from aqueous solution.

Preparation of Magnetic Iron Oxide Nanoparticles (MIONs) with Improved Saturation Magnetization Using Multifunctional Polymer Ligand.

This paper describes the preparation of ultra-small magnetic iron oxide (Fe3O4) nanoparticles (MIONs) coated with water-soluble thioether end-functionalized polymer ligand pentaerythritol tetrakis 3-mercaptopropionate-polymethacrylic acid (PTMP-PMAA). The MIONs were prepared by co-precipitation of aqueous iron precursor solution at a high temperature. The polymer modified MIONs were characterized by dynamic light scattering (DLS), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), X-ray powder diffraction (XRD), thermogravimetric analysis (TGA), and vibrating sample magnetometery (VSM). It was found that these MIONs were successfully modified by this water-soluble polymer ligand with a fairly uniform size and narrow size distribution. The dried powder of MIONs could be stored for a long time and re-dispersed well in water without any significant change. Additionally, the polymer concentration showed a significant effect on size and magnetic properties of the MIONs. The saturation magnetization was increased by optimizing the polymer concentration. Furthermore, the 3-(4,5-dimethylthiazol-2-yl)-2-5-diphenyltetrazolium bromide (MTT)-assay demonstrated that these MIONs were highly biocompatible and they could be successfully coupled with fluorescent dye Rhodamine due to the formation of amide bond between carboxylic acid groups of MIONs and amine groups of dye. The obtained results indicated that these multifunctional MIONs with rich surface chemistry exhibit admirable potential in biomedical applications.

Preparation of Magnetic Iron Oxide by Hydrothermal Method

Abstract. Iron oxide particles with spherical, date-pit like, or polyhedron morphology were obtained by hydrothermal method. The morphology, thermal analysis, crystal structure of the products was characterized by FESEM, thermogravimetry (TG), X-ray diffraction (XRD), respectively. The measured results reveal that the product of three different shapes is hematite (α-Fe2O3).

Synthesis and characterization of elemental iron and iron oxide nano/microcomposite particles by thermal decomposition of ferrocene

AbstractThe unique chemical and physical properties of the nano and microscale materials have led to important roles in the several scientific and technological fields. The magnetic nano/microparticles are of great interest because of its potential applications in, e.g., hyperthermia, magnetic resonance imaging (MRI), catalytic applications, etc. The decomposition of iron pentacarbonyl is one of the most common methods for the preparation of magnetic iron oxide and iron nanoparticles. However, Fe(CO)5 is severely toxic and alternative precursors should be used. Here, we describe the recent advances in the synthesis and characterization of the elemental iron and iron oxide nano/microcomposite particles by the thermal decomposition of ferrocene. The described synthesis process is based on simple nontoxic approaches including, for example, a solventless process. The particle size and size distribution as well as their composition, crystallinity, shape, and magnetic properties can be controlled via the synthesis conditions.

Magnetic Fe3O4 Nanoparticles: Synthesis and Application in Water Treatment

Magnetic separation is based on the exertion of a magnetic field to selectively collect the magnetic responsive materials. With the development of nanotechnology, magnetic separations based on nanomaterials have found various applications largely benefited from the size effect and synthetic advancement in their preparation. In this review the synthetic methods for the preparation of magnetic iron oxide (Fe3O4) nanoparticles including co-precipitation, hydrothermal and solvothermal synthesis, microemulsion, and sonochemical hydrolysis are discussed. Problems related to the nanoparticle preparation such as broad size distribution, easy aggregation and difficulties in surface functionalization are summarized and directions for improvement are pointed out. Furthermore, a summary on the application of magnetic iron oxide nanoparticles in water treatment is given including heavy metal ions removal, residue pesticide determination and removal, absorption of toxic water soluble molecules, and oily water treatment, and their new application potential is addressed specifically as a novel draw agent for forward osmosis. Finally, the perspectives and problems related to the application of iron oxide nanoparticles in water treatment are given. This review is of interest to both nanomaterial research scientists and water treatment engineers Keywords: Magnetic nanoparticle, Fe3O4, synthesis, application, water treatment, forward osmosis, nanotechnology, bioanalysis, nanoparticles, maghemite (Fe2O3), Fe-Cu solid solution, Micro-emulsion, cyclohexane, sonicating duration, silanization

Magnetic Fe3O4 Nanoparticles: Synthesis and Application in Water Treatment

Magnetic separation is based on the exertion of a magnetic field to selectively collect the magnetic responsive materials. With the development of nanotechnology, magnetic separations based on nanomaterials have found various applications largely benefited from the size effect and synthetic advancement in their preparation. In this review the synthetic methods for the preparation of magnetic iron oxide (Fe3O4) nanoparticles including co-precipitation, hydrothermal and solvothermal synthesis, microemulsion, and sonochemical hydrolysis are discussed. Problems related to the nanoparticle preparation such as broad size distribution, easy aggregation and difficulties in surface functionalization are summarized and directions for improvement are pointed out. Furthermore, a summary on the application of magnetic iron oxide nanoparticles in water treatment is given including heavy metal ions removal, residue pesticide determination and removal, absorption of toxic water soluble molecules, and oily water treatment, and their new application potential is addressed specifically as a novel draw agent for forward osmosis. Finally, the perspectives and problems related to the application of iron oxide nanoparticles in water treatment are given. This review is of interest to both nanomaterial research scientists and water treatment engineers

Synthesis and characterization of Fe and Fe 3O 4 nanoparticles by thermal decomposition of triiron dodecacarbonyl

Magnetic nanoparticles possess numerous potential applications, e.g., hyperthermia, magnetic resonance imaging (MRI), catalytic applications, etc. Decomposition of iron pentacarbonyl is one of the most common methods for preparation of magnetic iron oxide and iron nanoparticles. However, Fe(CO) 5 is severely toxic and alternative precursors should be used. The present manuscript presents a new simple method for preparation of iron oxide and iron nanoparticles, by thermal decomposition of Fe 3(CO) 12 in diethylene glycol diethyl ether with oleic acid as a stabilizer. The obtained magnetite (Fe 3O 4) nanoparticles were annealed at 300, 700 and 900 °C under inert atmosphere. The annealing temperature allowed control of size and size distribution of the nanoparticles, as well as their composition, crystallinity and magnetic properties. The as-prepared nanoparticles and the nanoparticles annealed at 300 °C are superparamagnetic with blocking temperatures of 22 and ∼140 K, respectively, while the nanoparticles annealed at 700 and 900 °C are ferromagnetic. The nanoparticles annealed at 900 °C are composed of pure Fe as the major phase (90%) and Fe 3O 4. Characterization of the obtained nanoparticles has been accomplished by routine methods such as transmission electron microscopy, powder X-ray diffraction, superconducting quantum interference, elemental analysis and Mössbauer spectroscopy.

Some Physicochemical Aspects of Nanoparticulate Magnetic Iron Oxide Colloids in Neat Water and in the Presence of Poly(vinyl alcohol)

The preparation of magnetic iron oxide colloids directly from the coprecipitation of Fe (2+) and Fe (3+) species at different temperatures may lead to crystallites of higher size as the temperature of the reaction increases. On the other hand, dynamic light scattering investigations and dielectric measurements rather point to the similar colloidal size of the entities existing in their aqueous or solid-state dispersions, irrespective of the size of the primary nanocrystallites. Significant enhancement of the stability of the colloids, even in the presence of high electrolyte concentrations, is furnished after the addition of relatively small amounts of poly(vinyl alcohol), and the stabilization mechanism is discussed in terms of the various forces participating in the system. The experimental results suggest that the increased colloidal stability is triggered from the particles' decrease of velocity rather than from steric (entropic) effects originating from polymer absorption.

The preparation of magnetic iron oxide

Two methods for the preparation of magnetic iron oxide starting from FeSO 4 · 7H 2O are described. The traditional method involves preparation of Fe(OH) 2 seed material, conversion of the seed to acicular γ-FeOOH crystals, dehydration of the crystals to α-Fe 2O 3, hydrogen reduction of Fe 2O 3 to magnetite, and finally reoxidation of magnetite particles to γ-Fe 2O 3. Magnetic iron oxide particles thus obtained, after a total processing time of about 25 h, have a coercivity between 330 and 380 Oe. The other method, known as the direct method, involves fewer steps, a shorter overall processing time, and yields magnetic iron oxide having an equivalent or higher coercivity value. A sample from the seed preparation solution is recrystallized at 250 °C, yielding a product, γ-Fe 2O 3, which has a coercivity value of 320 Oe. In another procedure the seed is prepared in the presence of H 2O 2 as the oxidizing agent and recrystallized at 300 °C for 2 h to yield γ-Fe 2O 3 having 390 Oe coercivity.

磁性酸化鉄の合成

磁性酸化鉄の合成