scholarly journals Electrostatically modulated magnetophoretic transport of functionalised iron-oxide nanoparticles through hydrated networks

Nanoscale ◽  
2020 ◽  
Vol 12 (19) ◽  
pp. 10550-10558 ◽  
Author(s):  
Stephen Lyons ◽  
Eoin P. Mc Kiernan ◽  
Garret Dee ◽  
Dermot F. Brougham ◽  
Aoife Morrin
Keyword(s):  
Magnetic Field ◽  
Iron Oxide ◽  
Magnetic Nanoparticles ◽  
External Magnetic Field ◽  
Field Gradient ◽  
Iron Oxide Nanoparticles ◽  
Magnetic Field Gradient ◽  
Polymer Networks ◽  
Oxide Nanoparticles

Factors that determine magnetophoretic transport of magnetic nanoparticles (MNPs) through hydrated polymer networks under the influence of an external magnetic field gradient were studied.

scholarly journals Iron Oxide Nanoparticles for Magnetic Hyperthermia

SPIN ◽  
2019 ◽  
Vol 09 (02) ◽  
pp. 1940001 ◽  
Author(s):  
N. A. Usov
Keyword(s):  
Magnetic Field ◽  
Iron Oxide ◽  
Magnetic Nanoparticles ◽  
Iron Oxide Nanoparticles ◽  
Stochastic Equation ◽  
Sharp Decrease ◽  
Dipole Interaction ◽  
Magnetic Hyperthermia ◽  
Alternating Magnetic Field ◽  
Oxide Nanoparticles

Assemblies of magnetic nanoparticles show a great potential for application in biomedicine, particularly, magnetic hyperthermia. However, to achieve desired therapeutic effect in magnetic hyperthermia, the assembly of nanoparticles should have a sufficiently high specific absorption rate (SAR) in alternating magnetic field of moderate amplitude and frequency. Using the Landau–Lifshitz stochastic equation, it is shown that dilute assemblies of iron oxide nanoparticles of optimal diameters are capable of providing SAR of the order of 400–600[Formula: see text]W/g in alternating magnetic field with the amplitude [Formula: see text][Formula: see text]Oe in the frequency range f = 300–500[Formula: see text]kHz. Unfortunately, in dense clusters of magnetic nanoparticles, which are often formed in a biological medium, there is a sharp decrease in SAR due to the influence of strong magneto-dipole interaction of closest nanoparticles. To overcome this difficulty, it is suggested covering the nanoparticles with nonmagnetic shells of sufficient thickness or using non-single-domain nanoparticles being in magnetization curling states.

Exploiting shape-selected iron oxide nanoparticles for the destruction of robust bacterial biofilms – active transport of biocides via surface charge and magnetic field control

Nanoscale ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 4328-4333
Author(s):  
Rachel Nickel ◽  
Mohammad Reza Kazemian ◽  
Yaroslav Wroczynskyj ◽  
Song Liu ◽  
Johan van Lierop
Keyword(s):  
Magnetic Field ◽  
Iron Oxide ◽  
Magnetic Nanoparticles ◽  
Surface Charge ◽  
Iron Oxide Nanoparticles ◽  
Active Transport ◽  
Bacterial Biofilms ◽  
Oxide Nanoparticles ◽  
Field Control

Biocide-loaded magnetic nanoparticles actively transport biocides through bacterial biofilms, with biocide loading and particle efficacy improved for non-spherical shapes such as cubes and tetrapods.

Synthesis and characterization of iron oxide nanoparticles grown via a non-conventional chemical method using an external magnetic field

2019 ◽  
Vol 242 ◽  
pp. 13-16 ◽  
Author(s):  
J. Arenas-Alatorre ◽  
S. Tehuacanero C. ◽  
O. Lukas ◽  
A. Rodríguez-Gómez ◽  
R. Hernández Reyes ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Iron Oxide ◽  
External Magnetic Field ◽  
Iron Oxide Nanoparticles ◽  
Chemical Method ◽  
Synthesis And Characterization ◽  
Oxide Nanoparticles

scholarly journals Synthesis and Characterization of Amorphous Iron Oxide Nanoparticles by the Sonochemical Method and Their Application for the Remediation of Heavy Metals from Wastewater

Nanomaterials ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 1551
Author(s):  
Virendra Kumar Yadav ◽  
Daoud Ali ◽  
Samreen Heena Khan ◽  
Govindhan Gnanamoorthy ◽  
Nisha Choudhary ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Electron Microscopy ◽  
Heavy Metals ◽  
Iron Oxide ◽  
Fly Ash ◽  
External Magnetic Field ◽  
Iron Oxide Nanoparticles ◽  
Batch Adsorption ◽  
Oxide Nanoparticles ◽  
Sonochemical Method

Nanoparticles have gained huge attention in the last decade due to their applications in electronics, medicine, and environmental clean-up. Iron oxide nanoparticles (IONPs) are widely used for the wastewater treatment due to their recyclable nature and easy manipulation by an external magnetic field. Here, in the present research work, iron oxide nanoparticles were synthesized by the sonochemical method by using precursors of ferrous sulfate and ferric chloride at 70 °C for one hour in an ultrasonicator. The synthesized iron oxide nanoparticles were characterized by diffraction light scattering (DLS), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), electron diffraction spectroscopy (EDS), high-resolution transmission electron microscopy (HRTEM) and vibrating sample magnetometer (VSM). The FTIR analysis exhibits characteristic absorption bands of IONPs at 400–800 cm−1, while the Raman spectra showed three characteristic bands at 273, 675, and 1379 cm−1 for the synthesized IONPs. The XRD data revealed three major intensity peaks at two theta, 33°, 35°, and 64° which indicated the presence of maghemite and magnetite phase. The size of the spherical shaped IONPs was varying from 9–70 nm with an average size of 38.9 nm while the size of cuboidal shaped particle size was in microns. The purity of the synthesized IONPs was confirmed by the EDS attached to the FESEM, which clearly show sharp peaks for Fe and O, while the magnetic behavior of the IONPs was confirmed by the VSM measurement and the magnetization was 2.43 emu/g. The batch adsorption study of lead (Pb) and chromium (Cr) from 20% fly ash aqueous solutions was carried out by using 0.6 mg/100 mL IONPs, which exhibited maximum removal efficiency i.e., 97.96% and 82.8% for Pb2+ and Cr ions, respectively. The fly ash are being used in making cements, tiles, bricks, bio fertilizers etc., where the presence of fly ash is undesired property which has to be either removed or will be brought up to the value of acceptable level in the fly ash. Therefore, the synthesized IONPs, can be applied in the elimination of heavy metals and other undesired elements from fly ash with a short period of time. Moreover, the IONPs that have been used as a nanoadsorbent can be recovered from the reaction mixture by applying an external magnetic field that can be recycled and reused. Therefore, this study can be effective in all the fly ash-based industries for elimination of the undesired elements, while recyclability and reusable nature of IONPs will make the whole adsorption or elimination process much economical.

Effect of External Magnetic Field on IV 99mTc-Labeled Aminosilane-Coated Iron Oxide Nanoparticles

2015 ◽  
Vol 40 (2) ◽  
pp. e104-e110 ◽  
Author(s):  
Mauro Liberatore ◽  
Mario Barteri ◽  
Valentina Megna ◽  
Piera D’Elia ◽  
Stefania Rebonato ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Iron Oxide ◽  
External Magnetic Field ◽  
Iron Oxide Nanoparticles ◽  
Oxide Nanoparticles

External Magnetic Field-Enhanced Chemo-Photothermal Combination Tumor Therapy via Iron Oxide Nanoparticles

2017 ◽  
Vol 9 (19) ◽  
pp. 16581-16593 ◽  
Author(s):  
Xiaomeng Guo ◽  
Wei Li ◽  
Lihua Luo ◽  
Zuhua Wang ◽  
Qingpo Li ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Iron Oxide ◽  
External Magnetic Field ◽  
Iron Oxide Nanoparticles ◽  
Tumor Therapy ◽  
Oxide Nanoparticles

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.

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