scholarly journals Synthesis of oxime-based CO-releasing molecules, CORMs and their immobilization on maghemite nanoparticles for magnetic-field induced CO release

2016 ◽  
Vol 45 (18) ◽  
pp. 7605-7615 ◽  
Author(s):  
Hajo Meyer ◽  
Markus Brenner ◽  
Simon-P. Höfert ◽  
Tim-O. Knedel ◽  
Peter C. Kunz ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Maghemite Nanoparticles

Labile and intensely colored CORMs are stabilized in alginate–dextran composites.

Nano- and Microstructures of Magnetic Field-Guided Maghemite Nanoparticles in Diblock Copolymer Films

2014 ◽  
Vol 6 (7) ◽  
pp. 5244-5254 ◽  
Author(s):  
Yuan Yao ◽  
Ezzeldin Metwalli ◽  
Martin A. Niedermeier ◽  
Matthias Opel ◽  
Chen Lin ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Diblock Copolymer ◽  
Maghemite Nanoparticles ◽  
Copolymer Films

scholarly journals Effect Of Different Molecular Coating on The Heating Properties of Maghemite Nanoparticles

2021 ◽  
Author(s):  
Marco Sanna Angotzi ◽  
Valentina Mameli ◽  
Shankar Khanal ◽  
Miroslav Veverka ◽  
Jana Vejpravova ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Maghemite Nanoparticles ◽  
Alternate Magnetic Field

In this work, the effect of different molecular coatings on the alternate magnetic field-induced heating properties of 15 nm maghemite nanoparticles (NPs) in water dispersions was studied at different frequencies...

Facile Alignment of Carbon Nanotubes Mediated by Tethered Maghemite Nanoparticles

2010 ◽  
Vol 1258 ◽  
Author(s):  
Il Tae Kim ◽  
Grady A Nunnery ◽  
Karl I Jacob ◽  
Justin Schwartz ◽  
Xiaotao Liu ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Carbon Nanotubes ◽  
Iron Oxide ◽  
Glass Fibers ◽  
Sol Gel ◽  
Magnetic Characteristics ◽  
Sodium Dodecylbenzene Sulfonate ◽  
Maghemite Nanoparticles ◽  
Cellulose Nanowhiskers ◽  
3D Network

AbstractWe describe a novel, facile method for the alignment of multi-walled carbon nanotubes (MWNTs) in a magnetic field facilitated by the decoration of the MWNTs with monodisperse γ-Fe2O3 magnetic (maghemite) nanoparticles. The tethering of the nanoparticles was achieved by the attachment of γ-Fe2O3 nanoparticles that were synthesized using a modified sol-gel process, onto the carboxylate-activated MWNTs. Sodium dodecylbenzene sulfonate (NaDDBS) was used to prevent the formation of an iron oxide 3D network. Various characterization methods were employed to confirm the formation of homogeneously-distributed and nearly-monodispersed iron oxide nanoparticles, and show that they were indeed tethered to the walls of the MWNTs. The γ-Fe2O3 nanoparticles imparted magnetic characteristics to the MWNTs, which in turn, were oriented parallel to the direction of an externally-applied magnetic field. This facile alignment of MWNT could promote the enhancement of various properties, e.g. mechanical and electrical properties, of the resulting composites. Moreover, this facile alignment at low magnetic fields, made possible by the magnetization of the carbon nanotubes through the tethering of maghemite nanoparticles, may be applied to a variety of other useful nanofillers, such a glass fibers, clay nanoparticles and cellulose nanowhiskers.

scholarly journals Thermodiffusion anisotropy under magnetic field in ionic liquid-based ferrofluids

Soft Matter ◽  
2021 ◽  
Author(s):  
Thiago Fiuza ◽  
Mitradeep Sarkar ◽  
Jesse Cornelius Riedl ◽  
Andrejs Cebers ◽  
Fabrice Cousin ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Ionic Liquid ◽  
Interparticle Interaction ◽  
Maghemite Nanoparticles

Ferrofluids based on maghemite nanoparticles (NPs), typically 10 nm in diameter, are dispersed in an ionic liquid (1-ethyl 3-methylimidazolium bistriflimide - EMIM-TFSI). The average interparticle interaction is found repulsive by...

scholarly journals Removal of Residual Oil from Produced Water Using Magnetic Nanoparticles

SPE Journal ◽  
2020 ◽  
Vol 25 (05) ◽  
pp. 2482-2495
Author(s):  
Jared Theurer ◽  
Oluwatobi Ajagbe ◽  
Jhouly Osorio ◽  
Rida Elgaddafi ◽  
Ramadan Ahmed ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Water Treatment ◽  
Water Samples ◽  
Large Scale ◽  
Oil Content ◽  
Produced Water ◽  
Maghemite Nanoparticles ◽  
Residual Oil ◽  
Produced Water Treatment ◽  
Feasible Option

Summary Recent studies have shown encouraging results using amine-coated magnetite (Fe3O4) nanoparticles to remove residual oil from produced water using a magnetic field. However, the manufacturing of magnetite nanoparticles requires an expensive coating operation, which limits the application of this technology in large-scale treatment operations. The goal of this study is to develop a simple, efficient, and economically feasible method for removing oil from produced water using nanoparticles. Iron oxide nanoparticles are biocompatible and even safely used in medical applications. This study focuses on the removal of residual oil from produced water using uncoated, recyclable, and less expensive maghemite (γ-Fe2O3) nanoparticles. These particles have shown the potential for removing oil layers from the surface of water. However, they have not been tested for their capability of removing emulsified and dissolved oil from produced water. In this study, commercial and synthesized maghemite nanoparticles were used. The maghemite nanoparticles were synthesized using the coprecipitation process. Laboratory-synthesized produced water samples with high oil concentration (1,000 ppm) were prepared by mixing medium oil with brine [1,180 ppm sodium chloride (NaCl) solution]. The nanoparticles were dispersed in 3% NaCl brine (w/w) at varying concentrations (0.31 to 5 mg/cm3) to form different nanosuspensions. Subsequently, the nanosuspensions were mixed with synthesized produced water for 10 minutes. When a magnetic field was applied to the mixture, a clear separation of the nanoparticles was observed within seconds. Residual oil in the samples was measured using nondispersive infrared spectroscopy. Oil content analysis confirmed the successful (99.9%) removal of oil from laboratory-synthesized water samples. For the real produced water samples, results showed a reduction of oil content to an undetectable level (i.e., less than 0.1 ppm). The ease of nanoparticle collection and washing after subsequent water treatments further demonstrates the feasibility of magnetic nanoparticle (MNP)-based separations for large-scale use in produced water treatment operations. The unique finding of this study is the elimination of one additional step of synthesizing (amine coating) MNPs. Direct use of uncoated maghemite nanoparticles with high oil removal efficiency can reduce produced water treatment costs and promote this technology as an economically feasible option within the industry.

Magnetic-field strengths from optical polarization data

1967 ◽  
Vol 31 ◽  
pp. 381-383
Author(s):  
J. M. Greenberg
Keyword(s):  
Magnetic Field ◽  
Optical Polarization ◽  
Polarization Data ◽  
Term Model ◽  
Source Of Information ◽  
Field Strengths

Van de Hulst (Paper 64, Table 1) has marked optical polarization as a questionable or marginal source of information concerning magnetic field strengths. Rather than arguing about this–I should rate this method asq+-, or quarrelling about the term ‘model-sensitive results’, I wish to stress the historical point that as recently as two years ago there were still some who questioned that optical polarization was definitely due to magnetically-oriented interstellar particles.

Observing the galactic magnetic field

1967 ◽  
Vol 31 ◽  
pp. 375-380
Author(s):  
H. C. van de Hulst
Keyword(s):  
Magnetic Field ◽  
Fair Agreement ◽  
Solar Neighbourhood ◽  
Galactic Magnetic Field ◽  
The Magnetic Field

Various methods of observing the galactic magnetic field are reviewed, and their results summarized. There is fair agreement about the direction of the magnetic field in the solar neighbourhood:l= 50° to 80°; the strength of the field in the disk is of the order of 10-5gauss.

Structure in the radiation of the galactic disk

1967 ◽  
Vol 31 ◽  
pp. 355-356
Author(s):  
R. D. Davies
Keyword(s):  
Magnetic Field ◽  
Galactic Disk ◽  
Galactic Magnetic Field ◽  
Measured Polarization

Observations at various frequencies between 136 and 1400 MHz indicate a considerable amount of structure in the galactic disk. This result appears consistent both with measured polarization percentages and with considerations of the strength of the galactic magnetic field.

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