Building block magneto-luminescent nanomaterials of iron-oxide/ZnS@LaF3:Ce3+,Gd3+,Tb3+ with green emission

2017 ◽  
Vol 5 (9) ◽  
pp. 2282-2290 ◽  
Author(s):  
Navadeep Shrivastava ◽  
L. U. Khan ◽  
Z. U. Khan ◽  
J. M. Vargas ◽  
O. Moscoso-Londoño ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Iron Oxide ◽  
External Magnetic Field ◽  
Building Block ◽  
Green Emission ◽  
Strong Green Emission ◽  
Uv Lamp

The bifunctional nanocomposite showing strong green emission of Tb3+ ions under a UV lamp (λ = 254 nm), with and without external magnetic field.

scholarly journals Targeted Delivery of Iron Oxide Nanoparticle-Loaded Human Embryonic Stem Cell-Derived Spherical Neural Masses for Treating Intracerebral Hemorrhage

2020 ◽  
Vol 21 (10) ◽  
pp. 3658
Author(s):  
Min Kyoung Kang ◽  
Tae Jung Kim ◽  
Young-Ju Kim ◽  
Lamie Kang ◽  
Jonghoon Kim ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Stem Cells ◽  
Stem Cell ◽  
Iron Oxide ◽  
External Magnetic Field ◽  
Targeted Delivery ◽  
Human Embryonic Stem Cell ◽  
Embryonic Stem ◽  
Iron Oxide Nanoparticle ◽  
Oxide Nanoparticle

This study evaluated the potential of iron oxide nanoparticle-loaded human embryonic stem cell (ESC)-derived spherical neural masses (SNMs) to improve the transportation of stem cells to the brain, ameliorate brain damage from intracerebral hemorrhage (ICH), and recover the functional status after ICH under an external magnetic field of a magnet attached to a helmet. At 24 h after induction of ICH, rats were randomly separated into three experimental groups: ICH with injection of phosphate-buffered saline (PBS group), ICH with intravenous injection of magnetosome-like ferrimagnetic iron oxide nanocubes (FION)-labeled SNMs (SNMs* group), and ICH with intravenous injection of FION-labeled SNMs followed by three days of external magnetic field exposure for targeted delivery by a magnet-embedded helmet (SNMs*+Helmet group). On day 3 after ICH induction, an increased Prussian blue-stained area and decreased swelling volume were observed in the SNMs*+Helmet group compared with that of the other groups. A significantly decreased recruitment of macrophages and neutrophils and a downregulation of pro-inflammatory cytokines followed by improved neurological function three days after ICH were observed in the SNMs*+Helmet group. Hemispheric atrophy at six weeks after ICH was significantly decreased in the SNMs*+Helmet group compared with that of the PBS group. In conclusion, we have developed a targeted delivery system using FION tagged to stem cells and a magnet-embedded helmet. The targeted delivery of SNMs might have the potential for developing novel therapeutic strategies for ICH.

Manipulation of Non-Magnetic Materials in Ferrofluid Containing Media

2005 ◽  
Vol 877 ◽  
Author(s):  
Derek Halverson ◽  
Ben Yellen ◽  
Gary Friedman
Keyword(s):  
Magnetic Field ◽  
Iron Oxide ◽  
External Magnetic Field ◽  
Magnetic Materials ◽  
Time Varying ◽  
Magnetic Islands ◽  
Iron Oxide Particles ◽  
Novel Method ◽  
Oxide Particles

AbstractA novel method is proposed whereby non-magnetic objects can be moved along a surface at the microscale and nanoscale. It uses a negative magnetophoretic force, explained in the caption for figure one, on the non-magnetic objects which results from stabilized 10nm diameter iron oxide particles (ferrofluid) being attracted to regions of field maxima around magnetic islands on a surface, which pushes the non-magnetic objects to regions of field minima. By varying an external magnetic field we can control where these minima are and thus control how objects will position themselves with static fields and by using rotating time varying fields we can control how they move across the surface. This method does not require the objects to be initially in contact with the surface, as they will be pulled down to the surface from solution. While this paper deals with beads, any arbitrarily shaped object should be manipuable using this method. Additionally, while we address non-magnetic objects in this work similar methods could easily manipulate objects that are magnetic.

scholarly journals Synthesis of nano-zirconium-iron oxide supported by activated carbon composite for the removal of Sb(v) in aqueous solution

RSC Advances ◽  
2021 ◽  
Vol 11 (49) ◽  
pp. 31131-31141
Author(s):  
Yanjun Liu ◽  
Lingda Meng ◽  
Kai Han ◽  
Shujuan Sun
Keyword(s):  
Magnetic Field ◽  
Aqueous Solution ◽  
Activated Carbon ◽  
Iron Oxide ◽  
External Magnetic Field ◽  
Carbon Composite ◽  
Liquid Separation ◽  
Highly Effective ◽  
Solid Liquid ◽  
Solid Liquid Separation

The adsorbent was highly effective in the removal of Sb(v). The adsorbent easily achieved solid–liquid separation under the action of an external magnetic field.

scholarly journals Electrochemical Performance of Iron Oxide Nanoflakes on Carbon Cloth under an External Magnetic Field

Metals ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 939
Author(s):  
Lei Geng ◽  
Zenglai Gao ◽  
Qibo Deng
Keyword(s):  
Magnetic Field ◽  
Iron Oxide ◽  
External Magnetic Field ◽  
Electrochemical Performance ◽  
Electrochemical Properties ◽  
Room Temperature ◽  
Aqueous Electrolyte ◽  
Carbon Cloth ◽  
Polarization Phenomenon ◽  
The Magnetic Field

In this work, the iron oxide (Fe2O3) nanoflakes on carbon cloth (Fe2O3@CC) were triumphantly prepared and served as the electrode of supercapacitors. By applying an external magnetic field, we first find that the magnetic field could suppress the polarization phenomenon of electrochemical performance. Then, the influences of the mono-/bi-valent cations on the electrochemical properties of the Fe2O3@CC were investigated under a large external magnetic field (1 T) in this work. The chemical valences of the cations in the aqueous electrolytes (LiNO3 and Ca(NO3)2) have almost no influences on the specific capacitance at different scan rates. As one of important parameters to describe the electrochemical properties, the working potential window of the Fe2O3@CC electrode was also investigated in this work. The broad potential window in room-temperature molten salt (LiTFSI + LiBETI (LiN(SO2CF3)2 + LiN(SO2C2F5)2)) has been obtained and reached 1.2 V, which is higher than that of the traditional aqueous electrolyte (~0.9 V).

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.

Behavior of magnetic particles in hamster lungs: estimates of clearance and cytoplasmic motility

1983 ◽  
Vol 55 (4) ◽  
pp. 1196-1202 ◽  
Author(s):  
P. Gehr ◽  
J. D. Brain ◽  
I. Nemoto ◽  
S. B. Bloom
Keyword(s):  
Magnetic Field ◽  
Iron Oxide ◽  
External Magnetic Field ◽  
External Field ◽  
Magnetic Particles ◽  
Relaxation Rates ◽  
Syrian Golden Hamsters ◽  
Relaxation Measurements ◽  
Particle Clearance ◽  
Relaxation Magnetization

Ferrimagnetic particles suspended in saline were instilled intratracheally into the lungs of Syrian golden hamsters. The particles were magnetized and aligned by applying an external magnetic field. Upon removal of the external field, the particles produced a remanent magnetic field from the lungs which decayed due to random misalignment of the particles (relaxation). Magnetization and relaxation measurements were performed immediately after instillation, then repeatedly during the first 24 h, and finally at intervals of several days up to 30 days after the instillation. The size of the initial remanent magnetic field immediately following each external magnetization is a measure of the amount of iron oxide in the lungs. It decreased with time, reflecting particle clearance. The rate of relaxation increased steeply during the first 12 h after the instillation and decreased slowly between the 5th and 30th day. Changes in the location of particles from extracellular to intracellular sites and movements from ectoplasmic to endoplasmic sites within cells may be responsible for the observed changes in relaxation rates with time.

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.

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