Synthesis of iron oxide nanoparticles in a continuous flow spiral microreactor and Corning® advanced flow™ reactor

2018 ◽  
Vol 7 (1) ◽  
pp. 1-11 ◽  
Author(s):  
Prashant L. Suryawanshi ◽  
Shirish H. Sonawane ◽  
Bharat A. Bhanvase ◽  
Muthupandian Ashokkumar ◽  
Makarand S. Pimplapure ◽  
...  
Keyword(s):  
Particle Size ◽  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Continuous Flow ◽  
Xrd Analysis ◽  
Resonance Spectroscopy ◽  
Oxide Nanoparticles ◽  
Flow Rates ◽  
Nanometer Size Range ◽  
Co Precipitation

AbstractIn the present work, synthesis of iron oxide nanoparticles (NPs) using continuous flow microreactor (MR) and advanced flow™ reactor (AFR™) has been investigated with evaluation of the efficacy of the two types of MRs. Effect of the different operating parameters on the characteristics of the obtained NPs has also been investigated. The synthesis of iron oxide NPs was based on the co-precipitation and reduction reactions using iron (III) nitrate precursor and sodium hydroxide as reducing agents. The iron oxide NPs were characterized using transmission electron microscopy (TEM), Fourier transform infrared spectroscopy, and X-ray diffraction (XRD) analysis. The mean particle size of the obtained NPs was less than 10 nm at all flow rates (over the range of 20−60 ml/h) in the case of spiral MR, while, in the case of AFR™, the particle size of NPs was below 20 nm with no specific trend observed with the operating flow rates. The XRD and TEM analyses of iron oxide NPs confirmed the crystalline nature and nanometer size range, respectively. Further, magnetic properties of the synthesized iron oxide NPs were studied using electron spin resonance spectroscopy; the resonance absorption peak shows theg-factor values as 2.055 and 2.034 corresponding to the magnetic fields of 319.28 and 322.59 mT for MR and AFR™, respectively.

scholarly journals Magnetic Properties and SAR for Gadolinium-Doped Iron Oxide Nanoparticles Prepared by Hydrothermal Method

Crystals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1153
Author(s):  
Heba Kahil ◽  
Ahmed Faramawy ◽  
Hesham El-Sayed ◽  
Adel Abdel-Sattar
Keyword(s):  
Iron Oxide ◽  
Hydrothermal Method ◽  
Iron Oxide Nanoparticles ◽  
Photoelectron Spectroscopy ◽  
Pure Iron ◽  
Xrd Analysis ◽  
Solubility Limit ◽  
Great Promise ◽  
Oxide Nanoparticles ◽  
Pure Iron Oxide

This study is an attempt to produce gadolinium-doped iron oxide nanoparticles for the purpose of utilization in magnetic fluid hyperthermia (MFH). Six gadolinium-doped iron oxide samples with varying gadolinium contents ( were prepared using the hydrothermal method and high vapor pressure to incorporate gadolinium ions in the iron oxide structure. The samples were indexed as , with varying from 0.0 to 0.1. The results reveal that gadolinium ions have a low solubility limit in the iron oxide lattice (x = 0.04). The addition of gadolinium caused distortion in the produced maghemite phase and formation of other phases. Based on X-ray diffraction (XRD) analysis and photoelectron spectroscopy (XPS), it was observed that gadolinium mostly crystalized as gadolinium hydroxide, for gadolinium concentrations above the solubility limit. The measured magnetization values are consistent with the formed phases. The saturation magnetization values for all gadolinium-doped samples are lower than the undoped sample. The specific absorption rate (SAR) for the pure iron oxide samples was measured. Sample GdIO/0.04, pure iron oxide doped with gadolinium, showed the highest potential to produce heat at a frequency of 198 kHz. Therefore, the sample is considered to hold great promise as an MFH agent.

Size distribution of magnetic iron oxide nanoparticles using Warren–Averbach XRD analysis

2012 ◽  
Vol 73 (7) ◽  
pp. 867-872 ◽  
Author(s):  
S. Mahadevan ◽  
S.P. Behera ◽  
G. Gnanaprakash ◽  
T. Jayakumar ◽  
J. Philip ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Size Distribution ◽  
Iron Oxide Nanoparticles ◽  
Xrd Analysis ◽  
Oxide Nanoparticles ◽  
Magnetic Iron Oxide Nanoparticles ◽  
Magnetic Iron Oxide

scholarly journals Nanocatalysis in continuous flow: supported iron oxide nanoparticles for the heterogeneous aerobic oxidation of benzyl alcohol

2013 ◽  
Vol 15 (6) ◽  
pp. 1530 ◽  
Author(s):  
David Obermayer ◽  
Alina M. Balu ◽  
Antonio A. Romero ◽  
Walter Goessler ◽  
Rafael Luque ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Benzyl Alcohol ◽  
Iron Oxide Nanoparticles ◽  
Continuous Flow ◽  
Aerobic Oxidation ◽  
Oxide Nanoparticles ◽  
Oxidation Of Benzyl Alcohol ◽  
Supported Iron

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.

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