scholarly journals Hyperthermia Efficiency of Magnetic Nanoparticles in Dense Aggregates of Cerium Oxide/Iron Oxide Nanoparticles

2018 ◽  
Vol 8 (8) ◽  
pp. 1241 ◽  
Author(s):  
Cindy Yadel ◽  
Aude Michel ◽  
Sandra Casale ◽  
Jerome Fresnais
Keyword(s):  
Iron Oxide ◽  
Magnetic Nanoparticles ◽  
Iron Oxide Nanoparticles ◽  
Absorption Rate ◽  
Specific Absorption Rate ◽  
Oxide Nanoparticles ◽  
Strong Impact ◽  
Heating Efficiency ◽  
Nanoparticles Dispersion

Iron oxide nanoparticles are intended to be used in bio-applications for drug delivery associated with hyperthermia. However, their interactions with complex media often induces aggregation, and thus a detrimental decrease of their heating efficiency. We have investigated the role of iron oxide nanoparticles dispersion into dense aggregates composed with magnetic/non-magnetic nanoparticles and showed that, when iron oxide nanoparticles were well-distributed into the aggregates, the specific absorption rate reached 79% of the value measured for the well-dispersed case. This study should have a strong impact on the applications of magnetic nanoparticles into nanostructured materials for therapy or catalysis applications.

scholarly journals Designing Iron Oxide Nanoparticles for Image Guided Thermal Medicine Applications

2019 ◽  
Author(s):  
Hattie Ring ◽  
Sheng Tong ◽  
Zhe Gao ◽  
Navid Manuchehrabadi ◽  
Kaiyi Jiang ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Iron Oxide ◽  
Field Strength ◽  
Iron Oxide Nanoparticles ◽  
Absorption Rate ◽  
Specific Absorption Rate ◽  
Oxide Nanoparticles ◽  
Image Guided ◽  
The Magnetic Field ◽  
The Ideal

This work evaluates MRI relaxation and the specific absorption rate properties of iron oxide nanoparticles (IONPs) as a function of diameter (6-32 nm). We conclude that the ideal IONP diameter for image guided heating applications is dependent on the magnetic field strength of the MRI for the intended application. <br>

Quantifying intra- and extracellular aggregation of iron oxide nanoparticles and its influence on specific absorption rate

Nanoscale ◽  
2016 ◽  
Vol 8 (35) ◽  
pp. 16053-16064 ◽  
Author(s):  
Seongho Jeon ◽  
Katie R. Hurley ◽  
John C. Bischof ◽  
Christy L. Haynes ◽  
Christopher J. Hogan
Keyword(s):  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Absorption Rate ◽  
Specific Absorption Rate ◽  
Oxide Nanoparticles ◽  
Specific Absorption

scholarly journals Controlling structural and magnetic properties of IONPs by aqueous synthesis for improved hyperthermia

RSC Advances ◽  
2017 ◽  
Vol 7 (22) ◽  
pp. 13159-13170 ◽  
Author(s):  
Debora Bonvin ◽  
Alla Arakcheeva ◽  
Angel Millán ◽  
Rafael Piñol ◽  
Heinrich Hofmann ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Iron Oxide ◽  
Saturation Magnetization ◽  
Iron Oxide Nanoparticles ◽  
Absorption Rate ◽  
Specific Absorption Rate ◽  
Oxide Nanoparticles ◽  
Aqueous Synthesis ◽  
Vacancy Ordering ◽  
Structural And Magnetic Properties

Introducing a hydrothermal step after coprecipitation leads to iron oxide nanoparticles with higher vacancy ordering, saturation magnetization and specific absorption rate.

scholarly journals Designing Iron Oxide Nanoparticles for Image Guided Thermal Medicine Applications

2019 ◽  
Author(s):  
Hattie Ring ◽  
Sheng Tong ◽  
Zhe Gao ◽  
Navid Manuchehrabadi ◽  
Kaiyi Jiang ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Iron Oxide ◽  
Field Strength ◽  
Iron Oxide Nanoparticles ◽  
Absorption Rate ◽  
Specific Absorption Rate ◽  
Oxide Nanoparticles ◽  
Image Guided ◽  
The Magnetic Field ◽  
The Ideal

This work evaluates MRI relaxation and the specific absorption rate properties of iron oxide nanoparticles (IONPs) as a function of diameter (6-32 nm). We conclude that the ideal IONP diameter for image guided heating applications is dependent on the magnetic field strength of the MRI for the intended application. <br>

scholarly journals Iron Oxide Nanorings and Nanotubes for Magnetic Hyperthermia: The Problem of Intraparticle Interactions

Nanomaterials ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1380
Author(s):  
Raja Das ◽  
Javier Alonso Masa ◽  
Vijaysankar Kalappattil ◽  
Zohreh Nemati ◽  
Irati Rodrigo ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Magnetic Nanoparticles ◽  
Absorption Rate ◽  
Specific Absorption Rate ◽  
Magnetic Nanostructures ◽  
Hysteresis Loops ◽  
Magnetic Hyperthermia ◽  
Magnetic Interactions ◽  
Effective Anisotropy ◽  
Heating Efficiency

Magnetic interactions can play an important role in the heating efficiency of magnetic nanoparticles. Although most of the time interparticle magnetic interactions are a dominant source, in specific cases such as multigranular nanostructures intraparticle interactions are also relevant and their effect is significant. In this work, we have prepared two different multigranular magnetic nanostructures of iron oxide, nanorings (NRs) and nanotubes (NTs), with a similar thickness but different lengths (55 nm for NRs and 470 nm for NTs). In this way, we find that the NTs present stronger intraparticle interactions than the NRs. Magnetometry and transverse susceptibility measurements show that the NTs possess a higher effective anisotropy and saturation magnetization. Despite this, the AC hysteresis loops obtained for the NRs (0–400 Oe, 300 kHz) are more squared, therefore giving rise to a higher heating efficiency (maximum specific absorption rate, SARmax = 110 W/g for the NRs and 80 W/g for the NTs at 400 Oe and 300 kHz). These results indicate that the weaker intraparticle interactions in the case of the NRs are in favor of magnetic hyperthermia in comparison with the NTs.

Evaluation of Surface-modified Superparamagnetic Iron Oxide Nanoparticles to Optimize Bacterial Immobilization for Bio-separation with the Least Inhibitory Effect on Microorganism Activity

2020 ◽  
Vol 10 (2) ◽  
pp. 166-174
Author(s):  
Mehdi Khoshneviszadeh ◽  
Sarah Zargarnezhad ◽  
Younes Ghasemi ◽  
Ahmad Gholami
Keyword(s):  
Iron Oxide ◽  
Amino Acid ◽  
Magnetic Nanoparticles ◽  
Iron Oxide Nanoparticles ◽  
Surface Coating ◽  
Superparamagnetic Iron Oxide ◽  
Superparamagnetic Iron Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Surface Charges ◽  
Surface Modified

Background: Magnetic cell immobilization has been introduced as a novel, facile and highly efficient approach for cell separation. A stable attachment between bacterial cell wall with superparamagnetic iron oxide nanoparticles (SPIONs) would enable the microorganisms to be affected by an outer magnetic field. At high concentrations, SPIONs produce reactive oxygen species in cytoplasm, which induce apoptosis or necrosis in microorganisms. Choosing a proper surface coating could cover the defects and increase the efficiency. Methods: In this study, asparagine, APTES, lipo-amino acid and PEG surface modified SPIONs was synthesized by co-precipitation method and characterized by FTIR, TEM, VSM, XRD, DLS techniques. Then, their protective effects against four Gram-positive and Gram-negative bacterial strains including Enterococcus faecalis, Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa were examined through microdilution broth and compared to naked SPION. Results: The evaluation of characterization results showed that functionalization of magnetic nanoparticles could change their MS value, size and surface charges. Also, the microbial analysis revealed that lipo-amino acid coated magnetic nanoparticles has the least adverse effect on microbial strain among tested SPIONs. Conclusion: This study showed lipo-amino acid could be considered as the most protective and even promotive surface coating, which is explained by its optimizing effect on cell penetration and negligible reductive effects on magnetic properties of SPIONs. lipo-amino acid coated magnetic nanoparticles could be used in microbial biotechnology and industrial microbiology.

scholarly journals Role of hydration and micellar shielding in tuning the structure of single crystalline iron oxide nanoparticles for designer applications

Nano Select ◽  
2021 ◽  
Author(s):  
Ramis Arbi ◽  
Amr Ibrahim ◽  
Liora Goldring‐Vandergeest ◽  
Kunyu Liang ◽  
Greg Hanta ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Single Crystalline

Effect of aluminum doped iron oxide nanoparticles on magnetic properties of the polyacrylonitrile nanofibers

2017 ◽  
Vol 37 (2) ◽  
pp. 135-141
Author(s):  
Armin Ourang ◽  
Soheil Pilehvar ◽  
Mehrzad Mortezaei ◽  
Roya Damircheli
Keyword(s):  
Magnetic Properties ◽  
Iron Oxide ◽  
Magnetic Nanoparticles ◽  
Iron Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Negative Interaction ◽  
Magnetic Nanofibers

Abstract In this work, polyacrylonitrile (PAN) was electrospun with and without magnetic nanoparticles (aluminum doped iron oxide) and was turned into magnetic nanofibers. The results showed that nanofibers diameter decreased from 700 nm to 300 nm by adding nanoparticles. Furthermore, pure PAN nanofibers were indicated to have low magnetic ability due to polar bonds that exist in their acrylonitrile groups. Obviously by adding only 4 wt% of the nanoparticles to PAN nanofibers, magnetic ability soared by more than 10 times, but at a higher percentage, it was shown to change just a little due to negative interaction among nanoparticles. This event relates to antiferromagnetically coupling of nanoparticles due to incomplete dispersion at higher percentage.

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