The Effect of Synthesis Method on the Physico-Chemical Properties of Magnetite Iron Oxide Nanoparticles

2013 ◽  
Vol 701 ◽  
pp. 212-216
Author(s):  
Hussein Mohd Zobir ◽  
Samuri Nor Suzariana ◽  
Shaari Abdul Halim
Keyword(s):  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Ultrasonic Method ◽  
Synthesis Method ◽  
Chemical Properties ◽  
Superparamagnetic Iron Oxide ◽  
Average Diameter ◽  
Oxide Nanoparticles ◽  
Physico Chemical ◽  
Co Precipitation

Superparamagnetic iron oxide nanoparticles were synthesized using co-precipitation, hydrothermal and ultrasonic routes from Fe2+/Fe3+ions and NaOH. The average diameter for the sample prepared using co-precipitation, hydrothermal and ultrasonic method is 33, 9 and 30 nm, respectively with surface area of 85, 117 and 87 m2/g, respectively. Although the results showed all the magnetite nanoparticles were superparamagnetic, but their saturation magnetization and coercitivity are different, depending on the method of synthesis. This study shows that method of synthesis is important that influence the physico-chemical properties of the resulting magnetite iron oxide nanoparticles.

scholarly journals Magnetic Nanoparticles to Unique DNA Tracers – Effect of Functionalization on Physico-Chemical Properties.

2020 ◽  
Author(s):  
Anuvansh Sharma ◽  
Jan Willem Foppen ◽  
Abhishek Banerjee ◽  
Sawssen Slimani ◽  
Nirmalya Bachhar ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Quantitative Polymerase Chain Reaction ◽  
Chemical Properties ◽  
High Signal ◽  
Oxide Nanoparticles ◽  
Physico Chemical ◽  
Highly Sensitive ◽  
Co Precipitation ◽  
20 Nm

Abstract Limited number of potential tracers such as salts, isotopes and dyes, make study of hydrological processes a challenge. Traditional tracers find limited use due to lack of multipoint tracing and background noise, among others. DNA based tracers have been shown to have great potential enabling synthesis of ideally unlimited number of unique tracers besides being environmentally friendly, highly sensitive and capable of multipoint tracing. To prevent unintentional losses in the environment during application and easy recovery for analysis, we hereby report DNA encapsulation in silica containing magnetic cores (iron oxide) of two different shapes – spheres and cubes, in the size range 10-20 nm, synthesized using co-precipitation or thermal decomposition. Physico-chemical properties such as size, zeta potential, etc of the iron oxide nanoparticles have been optimized for different ligands and surfactants. We report for the first time the effect of surface coating on the magnetic properties of the iron oxide nanoparticles at each stage of functionalization, culminating in silica shells. Efficiency of encapsulation of three different dsDNA molecules has been studied using quantitative polymerase chain reaction (qPCR). Our results show that our DNA based magnetic tracers can be used for hydrological monitoring with easy recoverability and high signal amplification.

scholarly journals Magnetic Nanoparticles to Unique DNA Tracers: Effect of Functionalization on Physico-chemical Properties

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Anuvansh Sharma ◽  
Jan Willem Foppen ◽  
Abhishek Banerjee ◽  
Slimani Sawssen ◽  
Nirmalya Bachhar ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Quantitative Polymerase Chain Reaction ◽  
Chemical Properties ◽  
High Sensitivity ◽  
High Signal ◽  
Oxide Nanoparticles ◽  
Physico Chemical ◽  
Co Precipitation ◽  
20 Nm

Abstract To monitor and manage hydrological systems such as brooks, streams, rivers, the use of tracers is a well-established process. Limited number of potential tracers such as salts, isotopes and dyes, make study of hydrological processes a challenge. Traditional tracers find limited use due to lack of multiplexed, multipoint tracing and background noise, among others. In this regard, DNA based tracers possess remarkable advantages including, environmentally friendly, stability, and high sensitivity in addition to showing great potential in the synthesis of ideally unlimited number of unique tracers capable of multipoint tracing. To prevent unintentional losses in the environment during application and easy recovery for analysis, we hereby report DNA encapsulation in silica containing magnetic cores (iron oxide) of two different shapes—spheres and cubes. The iron oxide nanoparticles having size range 10–20 nm, have been synthesized using co-precipitation of iron salts or thermal decomposition of iron oleate precursor in the presence of oleic acid or sodium oleate. Physico-chemical properties such as size, zeta potential, magnetism etc. of the iron oxide nanoparticles have been optimized using different ligands for effective binding of dsDNA, followed by silanization. We report for the first time the effect of surface coating on the magnetic properties of the iron oxide nanoparticles at each stage of functionalization, culminating in silica shells. Efficiency of encapsulation of three different dsDNA molecules has been studied using quantitative polymerase chain reaction (qPCR). Our results show that our DNA based magnetic tracers are excellent candidates for hydrological monitoring with easy recoverability and high signal amplification. Graphic Abstract

Sonochemical Synthesis of Silica Coated Super Paramagnetic Iron Oxide Nanoparticles

2013 ◽  
Vol 756 ◽  
pp. 74-79 ◽  
Author(s):  
Bashiru Kayode Sodipo ◽  
Azlan Abdul Aziz
Keyword(s):  
Iron Oxide ◽  
Silica Nanoparticles ◽  
Iron Oxide Nanoparticles ◽  
Ph Value ◽  
Superparamagnetic Iron Oxide ◽  
Silica Nanoparticle ◽  
Precipitation Method ◽  
Oxide Nanoparticles ◽  
Sonochemical Method ◽  
Co Precipitation

Superparamagnetic iron oxide nanoparticles (SPION) of sizes 5 to10 nm were synthesized by the co-precipitation method. They are coated with silica nanoparticles using sonication method. The SPION was produced under the optimum pH of 10, peptized in acidic medium and redispersed in water. The silica nanoparticles were produced through the Stöbermethod. Sonochemical coating of silica nanoparticle on the SPION was successfulat a pH value lower than 5. Otherwise, at higher pH value (but lower than point zero charge (PZC)), the SPION were found to be unstable. Fast hydrolysis of triethoxyvinylsilane(TEVS) shows that silica forms its own particles without coating onto the surfaces of the SPION. Under optimized experimental condition, sonochemical method of coating silica nanoparticles onto the SPION can be considered as an alternative for effective and prompt method that rely mainly on pH of the suspension.

Preparation, characterization and application of superparamagnetic iron oxide nanoparticles modified with natural polymers for removal of 60Co-radionuclides from aqueous solution

2017 ◽  
Vol 105 (2) ◽  
Author(s):  
Gehan E. Sharaf El-Deen ◽  
Neama G. Imam ◽  
Refaat R. Ayoub
Keyword(s):  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Superparamagnetic Iron Oxide ◽  
Superparamagnetic Iron Oxide Nanoparticles ◽  
Precipitation Method ◽  
Oxide Nanoparticles ◽  
Natural Polymers ◽  
Ft Ir ◽  
Co Precipitation ◽  
Ft Ir Spectroscopy

AbstractSuperparamagnetic iron oxide nanoparticles (IO-MNPs) coated with natural polymers, starch (IO-S MNPs) and dextrin (IO-D MNPs), were synthesized by modified co-precipitation method. IO and hybrid-IO-MNPs were characterized by XRD, SEM, HRTEM, FT-IR spectroscopy, vibrating sample magnetometer (VSM) and zeta potential (ZP). IO-S MNPs and IO-D MNPs have IO core-shell structure with core of 10.8 nm and 13.8 nm and shell of 7.5 nm and 5.9 nm, respectively. The efficiency of the hybrid IO-MNPs for sorption of

Synthesis and magnetostructural studies of amine functionalized superparamagnetic iron oxide nanoparticles

RSC Advances ◽  
2015 ◽  
Vol 5 (24) ◽  
pp. 18420-18428 ◽  
Author(s):  
A. B. Salunkhe ◽  
V. M. Khot ◽  
J. M. Ruso ◽  
S. I. Patil
Keyword(s):  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Superparamagnetic Iron Oxide ◽  
Superparamagnetic Iron Oxide Nanoparticles ◽  
Precipitation Method ◽  
Oxide Nanoparticles ◽  
Iron Ions ◽  
Amine Functionalized ◽  
Co Precipitation ◽  
New Generation

Superparamagnetic iron oxide nanoparticles are synthesized through the co precipitation method by using the new generation base diisopropylamine (DIPA) which electrostatically complexes with the iron ions, reduces them and subsequently caps the nanoparticles.

scholarly journals Superparamagnetic Iron Oxide Nanoparticles

2019 ◽  
Vol 5 (1) ◽  
pp. 307-309
Author(s):  
Kerstin Lüdtke-Buzug ◽  
Zuzana Penxová
Keyword(s):  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Direct Detection ◽  
Synthesis Method ◽  
Superparamagnetic Iron Oxide ◽  
Ultrasonic Waves ◽  
Superparamagnetic Iron Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Ultrasound Frequency

AbstractThe direct detection of the spatial distribution of Superparamagnetic Iron Oxide Nanoparticles (SPIONs) as a tracer for Magnetic Particle Imaging (MPI) enables threedimensional functional images with high spatial and temporal resolution. The commercially available tracers have not been developed primarily for MPI. Therefore, they do not sufficiently contribute to the desired image quality. Hence, optimizing the SPIONs during the production process is of interest. A peculiarity of the here presented synthesis method - the alkaline coprecipitation - is that this process takes place under ultrasonic control. The use of ultrasound creates extraordinary reaction conditions through sonochemical phenomena, such as formation, growth and implosive collapse of cavitation bubbles within a liquid. In addition, the ultrasonic waves and the oscillation of the medium improve the mixing process and thus ensure the homogenization during the synthesis. The objective of this study is the variation of ultrasonic frequencies and the type of used dextran as coating material, to provide SPIONs with better performance for MPI and more suitable properties for in vivo application. The focus of the optimization is to increase the magnetite core size while simultaneously reducing the hydrodynamic size. The experiments have shown that both, the ultrasound frequency and the molecular weight of used dextran, influence the properties of the SPIONs.

Ultra-Small Superparamagnetic Iron Oxide Nanoparticles as MRI Contrast Enhancing Agents

2008 ◽  
Vol 47-50 ◽  
pp. 1076-1079
Author(s):  
M.A. Do ◽  
H.J. Lee ◽  
J.H. Yeum ◽  
Y.M. Chang ◽  
H.D. Ghim ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Superparamagnetic Iron Oxide ◽  
Particle Size Analysis ◽  
Superparamagnetic Iron Oxide Nanoparticles ◽  
Precipitation Method ◽  
Size Analysis ◽  
Oxide Nanoparticles ◽  
Co Precipitation

Ultrasmall superparamagnetic iron oxide nanoparticles (USPION) as magnetic resonance imaging were synthesized through a sonochemical co-precipitation method with poly (ethyleneimine) (PEI). The size of the USPION was controlled by poly (ethyleneimine) (PEI) contents, ultrasonic exposure time, and Na4OH concentration. The characteristics of PEI-USPION were studied by X-ray diffractometry, magnetic property measurement system, scanning electron microscopy, transmission electron microscopy, and particle size analysis. The PEI-USPION had an average size of 5~10nm with a narrow size distribution, a perfect magnetite crystal structure, and high saturation magnetization.

scholarly journals Dynamics of Superparamagnetic Iron Oxide Nanoparticles with Various Polymeric Coatings

Materials ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 1793 ◽  
Author(s):  
Tomasz Strączek ◽  
Sylwia Fiejdasz ◽  
Damian Rybicki ◽  
Kamil Goc ◽  
Janusz Przewoźnik ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Dynamic Properties ◽  
Excitation Frequency ◽  
Superparamagnetic Iron Oxide ◽  
Superparamagnetic Iron Oxide Nanoparticles ◽  
Precipitation Method ◽  
Oxide Nanoparticles ◽  
Magnetic Dynamics ◽  
Co Precipitation

In this article, the results of a study of the magnetic dynamics of superparamagnetic iron oxide nanoparticles (SPIONs) with chitosan and polyethylene glycol (PEG) coatings are reported. The materials were prepared by the co-precipitation method and characterized by X-ray diffraction, dynamic light scattering and scanning transmission electron microscopy. It was shown that the cores contain maghemite, and their hydrodynamic diameters vary from 49 nm for PEG-coated to 200 nm for chitosan-coated particles. The magnetic dynamics of the nanoparticles in terms of the function of temperature was studied with magnetic susceptometry and Mössbauer spectroscopy. Their superparamagnetic fluctuations frequencies, determined from the fits of Mössbauer spectra, range from tens to hundreds of megahertz at room temperature and mostly decrease in the applied magnetic field. For water suspensions of nanoparticles, maxima are observed in the absorption part of magnetic susceptibility and they shift to higher temperatures with increasing excitation frequency. A step-like decrease of the susceptibility occurs at freezing, and from that, the Brown’s and Néel’s contributions are extracted and compared for nanoparticles differing in core sizes and types of coating. The results are analyzed and discussed with respect to the tailoring of the dynamic properties of these nanoparticle materials for requirements related to the characteristic frequency ranges of MRI and electromagnetic field hyperthermia.

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