scholarly journals Droplet-based synthesis of homogeneous magnetic iron oxide nanoparticles

2018 ◽  
Vol 9 ◽  
pp. 2413-2420 ◽  
Author(s):  
Christian D Ahrberg ◽  
Ji Wook Choi ◽  
Bong Geun Chung
Keyword(s):  
Particle Size ◽  
Iron Oxide ◽  
Magnetic Nanoparticles ◽  
Size Distribution ◽  
Iron Oxide Nanoparticles ◽  
Residence Time ◽  
Medical Applications ◽  
Oxide Nanoparticles ◽  
Magnetic Iron Oxide Nanoparticles ◽  
Magnetic Iron Oxide

Nanoparticles have gained large interest in a number of different fields due to their unique properties. In medical applications, for example, magnetic nanoparticles can be used for targeting, imaging, magnetically induced thermotherapy, or for any combination of the three. However, it is still a challenge to obtain narrowly dispersed, reproducible particles through a typical lab-scale synthesis when researching these materials. Here, we present a droplet capillary reactor that can be used for the synthesis of magnetic iron oxide nanoparticles. Compared to conventional batch synthesis, the particles synthesized in our droplet reactor have a narrower size distribution and a higher reproducibility. Furthermore, we demonstrate how the particle size can be changed from 5.2 ± 0.9 nm to 11.8 ± 1.7 nm by changing the reaction temperature and droplet residence time in the droplet capillary reactor.

scholarly journals Controlled Synthesis of Magnetic Iron Oxide Nanoparticles: Magnetite or Maghemite?

Crystals ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 214 ◽  
Author(s):  
Sebastian P. Schwaminger ◽  
Christopher Syhr ◽  
Sonja Berensmeier
Keyword(s):  
Particle Size ◽  
Iron Oxide ◽  
Magnetic Nanoparticles ◽  
Iron Oxide Nanoparticles ◽  
Ion Concentration ◽  
Oxide Nanoparticles ◽  
Magnetic Iron Oxide Nanoparticles ◽  
Magnetic Iron Oxide ◽  
Synthesis Conditions ◽  
Synthesis Parameters

Today, magnetic nanoparticles are present in multiple medical and industrial applications. We take a closer look at the synthesis of magnetic iron oxide nanoparticles through the co-precipitation of iron salts in an alkaline environment. The variation of the synthesis parameters (ion concentration, temperature, stirring rate, reaction time and dosing rate) change the structure and diameter of the nanoparticles. Magnetic iron oxide nanoparticles are characterized by X-ray diffraction (XRD), Raman spectroscopy and transmission electron microscopy (TEM). Magnetic nanoparticles ranging from 5 to 16 nm in diameter were synthesized and their chemical structure was identified. Due to the evaluation of Raman spectra, TEM and XRD, the magnetite and maghemite nanoparticles can be observed and the proportion of phases and the particle size can be related to the synthesis conditions. We want to highlight the use of Raman active modes A1g of spinel structured iron oxides to determine the content of magnetite and maghemite in our samples. Magnetite nanoparticles can be derived from highly alkaline conditions even without establishing an inert atmosphere during the synthesis. The correlation between the particle properties and the various parameters of the synthesis was modelled with linear mixture models. The two models can predict the particle size and the oxidation state of the synthesized nanoparticles, respectively. The modeling of synthesis parameters not only helps to improve synthesis conditions for iron oxide nanoparticles but to understand crystallization of nanomaterials.

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

Surface active magnetic iron oxide nanoparticles for extracting metal nanoparticles across an aqueous–organic interface

2019 ◽  
Vol 7 (34) ◽  
pp. 10623-10634 ◽  
Author(s):  
Meenakshi Verma ◽  
Kultar Singh ◽  
Mandeep Singh Bakshi
Keyword(s):  
Iron Oxide ◽  
Magnetic Nanoparticles ◽  
Metal Nanoparticles ◽  
Iron Oxide Nanoparticles ◽  
Gemini Surfactants ◽  
Oxide Nanoparticles ◽  
Magnetic Iron Oxide Nanoparticles ◽  
Magnetic Iron Oxide ◽  
Surface Active

Highly surface active magnetic nanoparticles (Fe3O4 NPs) were synthesized by using tetraalkylammonium and imidazolium Gemini surfactants.

scholarly journals Nanocomposites comprised of homogeneously dispersed magnetic iron-oxide nanoparticles and poly(methyl methacrylate)

2018 ◽  
Vol 9 ◽  
pp. 1613-1622 ◽  
Author(s):  
Sašo Gyergyek ◽  
David Pahovnik ◽  
Ema Žagar ◽  
Alenka Mertelj ◽  
Rok Kostanjšek ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Magnetic Nanoparticles ◽  
Methyl Methacrylate ◽  
Iron Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Magnetic Iron Oxide Nanoparticles ◽  
Uniform Loading ◽  
Magnetic Iron Oxide ◽  
Induced Hyperthermia ◽  
Pmma Matrix

Nanocomposites with a high, uniform loading of magnetic nanoparticles are very desirable for applications such as electromagnetic shielding and cancer treatment based on magnetically induced hyperthermia. In this study, a simple and scalable route for preparing nanocomposites with a high, uniform loading of magnetic nanoparticles is presented. The magnetic iron-oxide nanoparticles were functionalized with a methacrylate-based monomer that copolymerized in a toluene solution with the methyl methacrylate (MMA) monomer. The resulting suspension of magnetic nanoparticles decorated with poly(methyl methacrylate) (PMMA) chains in toluene were colloidal, even in the presence of a magnetic field gradient. Nanocomposites were precipitated from these suspensions. The transmission electron microscopy investigation of the prepared nanocomposites revealed that the magnetic nanoparticles were homogeneously dispersed in the PMMA matrix, even in amounts up to 53 wt %. The uniform dispersion of the nanoparticles in the PMMA matrix was attributed to the good solvation of the grafted PMMA chains from the magnetic nanoparticles by the PMMA chains of the matrix. The nanocomposites were superparamagnetic and exhibited large values for the saturation magnetization of up to 36 emu/g. Moreover, the nanocomposite with the largest amount of incorporated nanoparticles exhibited relatively large values for the specific power loss when subjected to alternating magnetic fields, giving this material great potential for the magnetically induced hyperthermia-based treatment of cancer.

Deep Eutectic Solvent Electrolysis for Preparing Water-Soluble Magnetic Iron Oxide Nanoparticles

Nanoscale ◽  
2021 ◽  
Author(s):  
Haiyang Jia ◽  
Jiawei Sun ◽  
Meng Dong ◽  
Hui Dong ◽  
Hongtao Zhang ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Magnetic Nanoparticles ◽  
Iron Oxide Nanoparticles ◽  
Deep Eutectic Solvent ◽  
Water Soluble ◽  
Oxide Nanoparticles ◽  
Magnetic Iron Oxide Nanoparticles ◽  
Magnetic Iron Oxide

Magnetic iron oxide nanoparticles have been proven versatile applications in biomedicine. Although numerous strategies have been developed to synthsize hydrophilic magnetic nanoparticles, it is still a challenge in quantity and...

scholarly journals Facile non-hydrothermal synthesis of oligosaccharide coated sub-5 nm magnetic iron oxide nanoparticles with dual MRI contrast enhancement effects

2014 ◽  
Vol 2 (33) ◽  
pp. 5344-5351 ◽  
Author(s):  
Jing Huang ◽  
Liya Wang ◽  
Xiaodong Zhong ◽  
Yuancheng Li ◽  
Lily Yang ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Magnetic Nanoparticles ◽  
Hydrothermal Synthesis ◽  
Contrast Enhancement ◽  
Hydrothermal Method ◽  
Iron Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Magnetic Iron Oxide Nanoparticles ◽  
Mri Contrast ◽  
Magnetic Iron Oxide

A simple non-hydrothermal method was developed for synthesizing sugar coated 3 nm magnetic nanoparticles with dual T1–T2 MRI contrast enhancement and fast clearance.

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