Sonochemical Synthesis of Silica Coated Super Paramagnetic Iron Oxide Nanoparticles

2013 ◽  
Vol 756 ◽  
pp. 74-79 ◽  
Author(s):  
Bashiru Kayode Sodipo ◽  
Azlan Abdul Aziz

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.

2017 ◽  
Vol 105 (2) ◽  
Author(s):  
Gehan E. Sharaf El-Deen ◽  
Neama G. Imam ◽  
Refaat R. Ayoub

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


RSC Advances ◽  
2015 ◽  
Vol 5 (24) ◽  
pp. 18420-18428 ◽  
Author(s):  
A. B. Salunkhe ◽  
V. M. Khot ◽  
J. M. Ruso ◽  
S. I. Patil

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.


2008 ◽  
Vol 47-50 ◽  
pp. 1076-1079
Author(s):  
M.A. Do ◽  
H.J. Lee ◽  
J.H. Yeum ◽  
Y.M. Chang ◽  
H.D. Ghim ◽  
...  

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.


Materials ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 1793 ◽  
Author(s):  
Tomasz Strączek ◽  
Sylwia Fiejdasz ◽  
Damian Rybicki ◽  
Kamil Goc ◽  
Janusz Przewoźnik ◽  
...  

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.


2017 ◽  
Vol 41 (5) ◽  
pp. 2055-2061 ◽  
Author(s):  
Tokeer Ahmad ◽  
Ruby Phul ◽  
Nafeesa Khatoon ◽  
Meryam Sardar

Iron oxide nanoparticles (IONPs) were preparedviaa co-precipitation method and were then characterized and evaluated for their antibacterial activity after modification withOcimum sanctumleaf extract.


2017 ◽  
Vol 41 (3) ◽  
pp. 129-135
Author(s):  
Fatemeh Ebrahimi ◽  
Maryam Karimi ◽  
Hasan Sereshti ◽  
Mohsen Yousefifar

Superparamagnetic iron oxide nanoparticles are increasingly used in medical applications due to their unique physical properties. They are useful carriers for delivering antitumour drugs in targeted cancer treatment. In this study, amido acid-functionalised magnetic nanoparticles (AAFMNs) are used as drug-delivery vehicles for doxorubicine as an efficient tool for the treatment of cancer. Magnetic iron oxide nanoparticles were synthesised using a co-precipitation method. The prepared iron oxide nanoparticles were then functionalised with amido acid functional groups. Finally, the synthesised AAFMNs were used for the delivery of doxorubicine. AAFMNs were characterised by Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, thermogravimetric analysis and zeta potential. An in vitro-determined hydrodynamic diameter of ∼80 nm suggested their applicability for this purpose. The findings show that AAFMNs are a promising tool for potential magnetic drug delivery.


2015 ◽  
Vol 15 (5) ◽  
pp. 3870-3878 ◽  
Author(s):  
S. Vikram ◽  
M. Dhakshnamoorthy ◽  
R. Vasanthakumari ◽  
A. R. Rajamani ◽  
Murali Rangarajan ◽  
...  

2014 ◽  
Vol 5 ◽  
pp. 1472-1476 ◽  
Author(s):  
Bashiru Kayode Sodipo ◽  
Azlan Abdul Aziz

We report a sonochemical method of functionalizing superparamagnetic iron oxide nanoparticles (SPION) with (3-aminopropyl)triethoxysilane (APTES). Mechanical stirring, localized hot spots and other unique conditions generated by an acoustic cavitation (sonochemical) process were found to induce a rapid silanization reaction between SPION and APTES. FTIR, XPS and XRD measurements were used to demonstrate the grafting of APTES on SPION. Compared to what was reported in literature, the results showed that the silanization reaction time was greatly minimized. More importantly, the product displayed superparamagnetic behaviour at room temperature with a more than 20% higher saturation magnetization.


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