Zero-valent iron core-iron oxide shell nanoparticles coated with silica and gold with high saturation magnetization

2021 ◽  
Author(s):  
Milad Mehdipour ◽  
Lucy O Gloag ◽  
Jiaxin Lian ◽  
Richard Tilley ◽  
John Justin Gooding
Keyword(s):  
Iron Oxide ◽  
Magnetic Nanoparticles ◽  
Saturation Magnetization ◽  
Zero Valent Iron ◽  
Oxide Shell ◽  
Iron Core ◽  
High Saturation Magnetization ◽  
Shell Nanoparticles ◽  
Magnetic Cores ◽  
New Type

A new type of gold-coated magnetic nanoparticles with a strongly magnetic zero-valent iron core-iron oxide shell as magnetic cores were synthesized. The small size of the magnetic cores and the...

Zero valent iron core–iron oxide shell nanoparticles as small magnetic particle imaging tracers

2020 ◽  
Vol 56 (24) ◽  
pp. 3504-3507 ◽  
Author(s):  
Lucy Gloag ◽  
Milad Mehdipour ◽  
Marina Ulanova ◽  
Kevin Mariandry ◽  
Muhammad Azrhy Nichol ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Magnetic Nanoparticle ◽  
Magnetic Particle ◽  
Zero Valent Iron ◽  
Oxide Shell ◽  
Iron Core ◽  
Shell Nanoparticles ◽  
Magnetic Particle Imaging ◽  
Nanoparticle Imaging ◽  
Particle Imaging

Zero valent iron core–iron oxide shell nanoparticles coated with a multi-phosphonate brush co-polymer are shown to be small and effective magnetic nanoparticle imaging tracers.

Application of novel iron core/iron oxide shell nanoparticles to sentinel lymph node identification

2015 ◽  
Author(s):  
Aidan Cousins ◽  
Douglas Howard ◽  
Anna M. Henning ◽  
Melanie R. M. Nelson ◽  
Richard D. Tilley ◽  
...  
Keyword(s):  
Lymph Node ◽  
Iron Oxide ◽  
Sentinel Lymph Node ◽  
Oxide Shell ◽  
Iron Core ◽  
Shell Nanoparticles ◽  
Sentinel Lymph Node Identification

Preparation and physical characterization of cobalt iron oxide magnetic nanoparticles loaded polyvinyl alcohol

2021 ◽  
pp. 089270572098557
Author(s):  
M Abu-Abdeen ◽  
O Saber ◽  
E Mousa
Keyword(s):  
Iron Oxide ◽  
Magnetic Nanoparticles ◽  
Polyvinyl Alcohol ◽  
Saturation Magnetization ◽  
Polymer Films ◽  
Magnetic Hysteresis ◽  
Thermal Method ◽  
Cobalt Iron Oxide ◽  
Cobalt Iron ◽  
Iron Oxide Magnetic Nanoparticles

A solvent thermal method which depends on a thermal process under critical temperature and pressure was used to prepare cobalt iron oxide magnetic nanoparticles with a molar ratio 2. The prepared particles were in the form of nanoparticles with diameter ranging from 5 to 10 nm and with amorphous structure. Magnetic hysteresis behavior with saturation magnetization 36.31 emu/g and coercivity 4 Oe were observed for the nanoparticles. Polyvinyl alcohol was loaded with different concentrations of cobalt iron oxide nanoparticles using casting technique. Hysteresis loops for the polymer films were observed and both the saturation magnetization and coercivity were increased from 0.36 to 16.03 emu/g and 115 to 293 Oe for samples containing 5 and 20 wt% of nanoparticles, respectively. The elastic modulus of films was increased from 2.7 to 4.9 GPa for unloaded and loaded samples with 20 wt%, respectively. The storage modulus of the polymer films was found to obey the percolation behavior.

Synthesis of PVP Coated Superparamagnetic Iron Oxide Nanoparticles with a High Saturation Magnetization

2019 ◽  
Vol 290 ◽  
pp. 301-306
Author(s):  
Osama Abu Noqta ◽  
Azlan Abdul Aziz ◽  
Adamu Ibrahim Usman
Keyword(s):  
Iron Oxide ◽  
Saturation Magnetization ◽  
Iron Oxide Nanoparticles ◽  
Superparamagnetic Iron Oxide ◽  
Superparamagnetic Iron Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
High Saturation Magnetization ◽  
One Pot ◽  
High Saturation ◽  
Size Of Particles

Superparamagnetic iron oxide nanoparticles (SPION) were synthesized by one pot coprecipitation method at room temperature in the presence of Polyvinylpyrrolidone (PVP). X-ray powder diffraction (XRD), transmission electron microscopy (TEM), and Vibrating Sample Magnetometer (VSM) were used to analysis the physicochemical properties of PVP-SPION. The XRD patterns confirmed that the structure of as-synthesized sample is magnetite with cubic structure system. In TEM results, the image of PVP-SPION displayed that the size of particles was 14.05 nm with narrower size distribution and also the PVP played important role to minimize the agglomeration of SPION. Finally, the high saturation magnetization value of PVP-SPION (53.0 emu/g) indicate the as-synthesized sample has a great potential as a contrast agent for MRI.

Iron Oxide Shell as the Oxidation-Resistant Layer in SmCo5@Fe2O3 Core–Shell Magnetic Nanoparticles

2007 ◽  
Vol 7 (1) ◽  
pp. 356-361 ◽  
Author(s):  
Xiaowei Teng ◽  
Hong Yang
Keyword(s):  
Iron Oxide ◽  
Magnetic Nanoparticles ◽  
Iron Pentacarbonyl ◽  
Trioctylphosphine Oxide ◽  
Oxide Shell ◽  
Ambient Conditions ◽  
Exchange Biasing ◽  
Antiferromagnetic Layer ◽  
Co Nanoparticles ◽  
Resistant Layer

This paper presents a synthesis of magnetic nanoparticles of samarium cobalt alloys and the use of iron oxide as a coating layer to prevent the rapid oxidation of as-made Sm–Co nanoparticles. The colloidal nanoparticles of Sm–Co alloys were made in octyl ether using samarium acetylacetonate and dicobalt octacarbonyl as precursors in a mixture of 1,2-hexadecanediol, oleic acid, and trioctylphosphine oxide (TOPO). Such Sm–Co nanoparticle could be readily oxidized by air and formed a CoO antiferromagnetic layer. Exchange biasing was observed for the surface oxidized nanoparticles. In situ thermal decomposition of iron pentacarbonyl was used to create iron oxide shells on the Sm–Co nanoparticles. The iron oxide shell could prevent Sm–Co nanoparticles from rapid oxidation upon the exposure to air at ambient conditions.

scholarly journals Key Parameters on the Microwave Assisted Synthesis of Magnetic Nanoparticles for MRI Contrast Agents

2017 ◽  
Vol 2017 ◽  
pp. 1-13 ◽  
Author(s):  
Maria Eugênia Fortes Brollo ◽  
Sabino Veintemillas-Verdaguer ◽  
Cesar Menor Salván ◽  
Maria del Puerto Morales
Keyword(s):  
Iron Oxide ◽  
Magnetic Nanoparticles ◽  
Contrast Agents ◽  
Saturation Magnetization ◽  
Synthesis Method ◽  
Mri Contrast Agents ◽  
Microwave Assisted Synthesis ◽  
Organic Media ◽  
Experimental Conditions ◽  
Microwave Assisted

Uniform iron oxide magnetic nanoparticles have been synthesized using a microwave assisted synthesis method in organic media and their colloidal, magnetic, and relaxometric properties have been analyzed after its transference to water and compared with those nanoparticles prepared by thermal decomposition in organic media. The novelty of this synthesis relies on the use of a solid iron oleate as precursor, which assures the reproducibility and scalability of the synthesis, and the microwave heating that resulted in being faster and more efficient than traditional heating methods, and therefore it has a great potential for nanoparticle industrial production. The effect of different experimental conditions such as the solvent, precursor, and surfactant concentration and reaction time as well as the transference to water is analyzed and optimized to obtain magnetic iron oxide nanoparticles with sizes between 8 and 15 nm and finally colloids suitable for their use as contrast agents on Magnetic Resonance Imaging (MRI). The r2 relaxivity values normalized to the square of the saturation magnetization were shown to be constant and independent of the particle size, which means that the saturation magnetization is the main parameter controlling the efficiency of these magnetic nanoparticles as MRI T2-contrast agents.

Iron Oxide Composite Nanoparticles and Sensing Properties

2005 ◽  
Vol 900 ◽  
Author(s):  
Lingyan Wang ◽  
Xiajing Shi ◽  
Sakienah Mahs ◽  
Jeongku Choi ◽  
Karan Sarup ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Oxide Shell ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Fe Oxide ◽  
Sensing Properties ◽  
Volatile Organic ◽  
Unique Aspect ◽  
Core Shell Nanoparticles ◽  
Piezoelectric Devices

ABSTRACTThis paper reports findings of an investigation of the synthesis of monolayer-capped iron oxide and core (iron oxide)-shell (gold) nanocomposite and their assembly towards thin films as sensing materials. Pre-synthesized and size-defined iron oxide nanoparticles were used as seeding materials for the reduction of gold precursors, which was shown to be effective for coating the iron oxide cores with gold shells (Fe oxide@Au). The unique aspect of our synthesis is the formation of Fe oxide@Au core-shell nanoparticles with controllable surface properties. By controlling the reaction temperatures and manipulating the capping agent properties and solution compositions, the size, shape, composition, and monodispersity can be tailored. The core-shell nanoparticles were shown to form molecularly-mediated thin film assemblies using molecular mediators. The sensing properties of the nanostructures on piezoelectric devices were examined for the detection of volatile organic compounds. The preliminary results have provided important insights into the design of core-shell nanocomposites as sensing materials.

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