scholarly journals The vehicle braking systems as main source of inhalable airborne magnetite particles in trafficked areas

2022 ◽  
Vol 158 ◽  
pp. 106991
Author(s):  
Gabriel M. Ingo ◽  
Cristina Riccucci ◽  
Gianluca Pisani ◽  
Marianna Pascucci ◽  
Daniele D'Ercole ◽  
...  
Keyword(s):  
Magnetite Particles

A New Method for Direct Determination of the Recoilless Fraction with Application to Magnetic Nanoparticles

2002 ◽  
Vol 721 ◽  
Author(s):  
Monica Sorescu
Keyword(s):  
Room Temperature ◽  
Average Particle Size ◽  
Direct Determination ◽  
Average Particle ◽  
Lattice Method ◽  
Recoilless Fraction ◽  
Single Room ◽  
Magnetite Particles ◽  
Physical Mixtures

AbstractWe propose a two-lattice method for direct determination of the recoilless fraction using a single room-temperature transmission Mössbauer measurement. The method is first demonstrated for the case of iron and metallic glass two-foil system and is next generalized for the case of physical mixtures of two powders. We further apply this method to determine the recoilless fraction of hematite and magnetite particles. Finally, we provide direct measurement of the recoilless fraction in nanohematite and nanomagnetite with an average particle size of 19 nm.

Tuning the Magnetic Vortex State in Magnetite Nanodiscs for Remote Control of Biological Signalling

2019 ◽  
Author(s):  
Danijela Gregurec ◽  
Alexander W. Senko ◽  
Andrey Chuvilin ◽  
Pooja Reddy ◽  
Ashwin Sankararaman ◽  
...  
Keyword(s):  
Remote Control ◽  
Ion Channels ◽  
Ground State ◽  
Magnetic Particles ◽  
Colloidal Stability ◽  
Vortex State ◽  
Magnetic Vortex ◽  
Electron Holography ◽  
Dipole Interactions ◽  
Magnetite Particles

In this work, we demonstrate the application of anisotropic magnetite nanodiscs (MNDs) as transducers of torque to mechanosensory cells under weak, slowly varying magnetic fields (MFs). These MNDs possess a ground state vortex configuration of magnetic spins which affords greater colloidal stability due to eliminated dipole-dipole interactions characteristic of isotropic magnetic particles of similar size. We first predict vortex magnetization using micromagnetic stimulations in sub-micron anisotropic magnetite particles and then use electron holography to experimentally investigate the magnetization of MNDs 98–226 nm in diameter. When MNDs are coupled to MFs, they transition between vortex and in-plane magnetization allowing for the exertion of the torque on the pN scale, which is sufficient to activate mechanosensitive ion channels in cell membranes.<br>

Sorption of Water Soluble Organic Dyes on Magnetic Poly(oxy-2,6-dimethyl-1,4-phenylene)

1995 ◽  
Vol 60 (9) ◽  
pp. 1448-1456 ◽  
Author(s):  
Ivo Šafařík ◽  
Miroslava Šafaříková ◽  
Vlasta Buřičová
Keyword(s):  
Organic Compounds ◽  
Azo Dye ◽  
Organic Dyes ◽  
Water Soluble ◽  
Magnetic Composite ◽  
Water Solutions ◽  
Magnetite Particles

Magnetic composite based on poly(oxy-2,6-dimethyl-1,4-phenylene) (PODMP) was prepared by melting the polymer with ε-caprolactam in a presence of fine magnetite particles. Magnetic PODMP was used for sorption of water soluble organic compounds (dyes belonging to triphenylmethane, heteropolycyclic and azo dye groups) from water solutions. There were considerable differences in the binding of the dyes tested. In general, heteropolycyclic dyes exhibited the lowest sorption.

scholarly journals Application of modified green algae Nannochloropsis sp. as adsorbent in the simultaneous adsorption of Methylene Blue and Cu(II) cations in solution

2021 ◽  
Vol 31 (1) ◽  
Author(s):  
Buhani ◽  
Tri Agus Wijayanti ◽  
Suharso ◽  
Sumadi ◽  
Muslim Ansori
Keyword(s):  
Heavy Metals ◽  
Methylene Blue ◽  
Green Algae ◽  
Contact Time ◽  
Organic Dyes ◽  
Silica Matrix ◽  
Particle Coating ◽  
Adsorption Data ◽  
Magnetite Particles ◽  
Simultaneous Sorption

AbstractBiomass of algae is a very potent adsorbent for absorbing aqueous waste containing heavy metals and organic dyes. This study purposes to confirm the ability of adsorbents from green algae Nannochloropsis sp. modified with silica (ASN) and followed by coating magnetite particles (ASN-MPs) to absorb simultaneously the mixture of Methylene Blue (ME) and Cu(II) cations in aqueous solution. Simultaneous sorption of ME and Cu(II) cations to ASN and ASN-MPs was carried out by the batch method with the interaction pH condition 7, contact time 90 min, and initial concentrations of ME and Cu(II) cations (0.1–1.0 mM). Based on adsorption data, Cu(II) cations have a greater adsorption rate and capacity (qm) compared to ME at the same contact time and initial concentration. The adsorption capacity (qm) values of the bi-component ME and Cu(II) cation mixture in ASN and ASN-MPs were 1.39 × 10− 1 and 5.32 × 10− 1 mmol g− 1, respectively, with the binary Langmuir adsorption isotherm constant for Cu(II) cations greater than ME. Modified adsorbent from algae Nannochloropsis sp. with silica matrix and magnetite particle coating is an adsorbent that has a high effectiveness in the collective sorption of ME and Cu(II) cations. Therefore, these adsorbents can be used for the adsorption of cation mixtures of heavy metals and organic dyes that are cationic in solution.

Electrophoretic mobility of magnetite particles in high temperature water

2011 ◽  
Vol 66 (18) ◽  
pp. 4029-4035 ◽  
Author(s):  
Sonja Vidojkovic ◽  
Victor Rodriguez-Santiago ◽  
Mark V. Fedkin ◽  
David J. Wesolowski ◽  
Serguei N. Lvov
Keyword(s):  
High Temperature ◽  
Electrophoretic Mobility ◽  
High Temperature Water ◽  
Magnetite Particles ◽  
Temperature Water

Control of the morphology and size of magnetite particles with peptides mimicking the Mms6 protein from magnetotactic bacteria

2010 ◽  
Vol 343 (1) ◽  
pp. 65-70 ◽  
Author(s):  
Atsushi Arakaki ◽  
Fukashi Masuda ◽  
Yosuke Amemiya ◽  
Tsuyoshi Tanaka ◽  
Tadashi Matsunaga
Keyword(s):  
Magnetotactic Bacteria ◽  
Magnetite Particles

scholarly journals The Effect of Particle Concentration on the Heating Rate of Ferrofluids for Magnetic Hyperthermia

2015 ◽  
Vol 58 (1) ◽  
pp. 81-88 ◽  
Author(s):  
I. Malaescu ◽  
C. N. Marin ◽  
M. Bunoiu ◽  
P. C. Fannin ◽  
N. Stefu ◽  
...  
Keyword(s):  
Magnetic Susceptibility ◽  
Oleic Acid ◽  
Dilution Rate ◽  
Heating Rate ◽  
Particle Concentration ◽  
Magnetic Hyperthermia ◽  
Initial Sample ◽  
Frequency Field ◽  
Three Samples ◽  
Magnetite Particles

Abstract The complex magnetic susceptibility χ(f) = χ′(f) - i χ″(f), of a ferrofluid sample with magnetite particles dispersed in kerosene and stabilized with oleic acid, over the range 0.1 GHz to 6 GHz, was determined. The initial sample has been successively diluted with kerosene (with a dilution rate of 2/3), thus obtaining further three samples. Using the complex magnetic susceptibility measurements of each sample, the frequency field and particle concentration dependencies of the heating rate of the ferrofluid samples, were analyzed. The results show the possibility of using the heating rate of ferrofluid samples with different particle concentrations, in hyperthermia applications.

Use of magnetite particles as a contrast agent for MR imaging of the liver.

Radiology ◽  
1990 ◽  
Vol 174 (2) ◽  
pp. 357-360 ◽  
Author(s):  
Y Kawamura ◽  
K Endo ◽  
Y Watanabe ◽  
T Saga ◽  
T Nakai ◽  
...  
Keyword(s):  
Mr Imaging ◽  
Contrast Agent ◽  
Magnetite Particles

Magnetorheological behavior of magnetoactive elastomers filled with bimodal iron and magnetite particles

2017 ◽  
Vol 26 (3) ◽  
pp. 035019 ◽  
Author(s):  
Vladislav V Sorokin ◽  
Gennady V Stepanov ◽  
Mikhail Shamonin ◽  
Gareth J Monkman ◽  
Elena Yu Kramarenko
Keyword(s):  
Magnetite Particles
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