ferromagnetism, physical phenomenon in which certain electrically uncharged materials strongly attract others. Two materials found in nature, lodestone (or magnetite, an oxide of iron, Fe 3 O 4) and iron, have the ability to acquire such attractive powers, and they are often called natural ferromagnets. They were discovered more than …Web

Magnetite occurs widely in natural environments in both inorganic and biogenic forms. Discrimination of the origin of magnetite has important implications, from searching for past microbial activity to interpreting paleomagnetic and environmental magnetic records in a wide range of settings. ... Synchrotron-based X-ray magnetic …Web

The iron oxide mineral magnetite (Fe3O4) is produced by various organisms to exploit magnetic and mechanical properties. ... On the basis of X-ray circular magnetic dichroism, hematite (α-Fe 2 O 3) was found as a precursor to magnetite in the same bacterial strain and was suggested to represent an outer layer around the nascent …Web

1. Introduction. Magnetite nanofluids are engineered colloidal suspension of magnetite nanoparticles in a basefluid, designed to be used in heat transfer applications such as cooling systems of microdevices [1].Recent studies have shown significant enhancement in the thermal conductivity of magnetite nanofluids when magnetic fields …Web

Spinel inclusions of different size in a magnetite grain of magnetite-dolomite-serpentine rock 991/61.8 (a); distribution of their equivalent circular diameter (b) and distribution of a typical equivalent circular diameter D char (average equivalent circular diameter of a grain fraction with the largest summary area) in the analyzed samples of ...Web

PDF | In this study, we demonstrate that optical magnetic circular dichroism (OMCD) in Faraday geometry can serve as an effective means of... | Find, read and cite all the research you need on ...Web

Measurements of magnetic circular dichroism in Fe 2p resonant photoemission and calculations based on a full-multiplet cluster model reveal the parameters of the electronic structure of Fe3O4. We ...Web

versatile magnetic imaging technique using visible light. Unlike most magnetic imaging techniques, photothermal magnetic circular dichroism (PT MCD) …Web

The scale bar is 100 nm. (b) Reconstructed phase distribution of (a) showing that each particle has a concentric circular magnetic field and a closed (that is, vortex) structure. The yellow and ...Web

A further mystery is how magnetite arrives in the brain in the first place: One study of the frontal cortex of 37 human brains suggests that we breathe in magnetite from the environment. But other ...Web

@article{osti_1601835, title = {An X-ray magnetic circular dichroism (XMCD) study of Fe ordering in a synthetic MgAl2O4 – Fe3O4 (spinel – magnetite) solid solution series; implications for magnetic properties and cation site ordering}, author = {Henderson, C. Michael B. and Pearce, Carolyn I. and Charnock, John M. and Charnock, John M. and …Web

An application of high pressure affects anomalously the behavior of magnetic and electronic properties of magnetite, ultimately leading to a structural phase transition above P ~ 25 GPa 10,11,12 ...Web

Roberts, A. P. et al. Searching for single domain magnetite in the 'pseudo-single-domain' sedimentary haystack: implications of biogenic magnetite preservation for sediment magnetism and ...Web

Here, we present new evidences from X-ray magnetic circular dichroism (XMCD) for element- and site-specific magnetic analyses that cobalt is incorporated in the spinel structure of the magnetosomes within Magnetospirillum magneticum AMB-1 through the replacement of Fe 2+ ions by Co 2+ ions in octahedral (O h) sites of magnetite.Web

Magnetite nanoparticles were synthesized by the coprecipitation method. Additionally, two composites of silica-coated magnetite nanoparticles were synthesized by the Stöber method. ... This study makes a significant contribution to the circular economy by providing an efficient method for recycling the yerba mate waste and a sustainable ...Web

Titanium or vanadium metals or their alloys are important industrial metals/alloys. Because these resources are in short supply, the investigation of potential titaniferous-vanadiferous deposits needs special attention to bridge the supply-demand gap. The study integrates geological, geochemical, remote sensing, and geophysical data for …Web

Fe K-edge x-ray magnetic circular dichroism of magnetite (Fe 3O 4) powders was measured with synchrotron radiation under variable pressure and temperature conditions in diamond anvil cell. The magnetic dichroism was observed to decrease discontinuously by 50% between 12 and 16 GPa, independent of temperature.Web

The surface of the magnetite core can be modified using any of the three approaches: (1) coating of the bare magnetic nanoparticles (MNPs) within a shell, which …Web

In our previous studies, we investigated the performance of a novel pneumatic planar magnetic separator (PMS) for the dry beneficiation of a selected magnetite ore. In the present study, we have extended the studies on the PMS with the focus on investigating how various PMS processing flowsheet configurations influence its …Web

In this study, we demonstrate that optical magnetic circular dichroism (OMCD) in Faraday geometry can serve as an effective means of characterizing the valence electronic structure of magnetic oxide systems. Molecular-beam-epitaxy-grown magnetite thin film single crystals served as the test sample. The dominant spin channels of optical …Web

Goethite (FeO(OH)), hematite (Fe 2 O 3), and magnetite (Fe 3 O 4) are commercially valuable minerals which can be synthesized using Fe-rich salts or are formed naturally by geological processes (Akinwekomi et al., 2017, Duuring et al., 2018, Ali et al., 2016). These minerals are used in a number of fields (biomedicine, agriculture, and ...Web

the magnetite mineral has been attracting much interest in the eld of biomedical, water treatment, magnetic sensing probes, bio sensors, and catalysis due to its unique crystal-line polymorph's structure from the bivalent and trivalent iron ions (Campos et al. 2015). The interesting potential applications of magnetite mineral have inspired numer-Web

The Ag modified magnetite NPs synthesized by the thermal decomposition of the of Fe(NO 3) 3 ·9H 2 O and AgNO 3 mixture have been studied with X-ray diffraction, …Web

The essence of particle motion is stress, and different stress is the reason for different particle motion trajectories. Based on this theory, the magnetite particle stress at six typical representative points of the three-product magnetic separation column is studied, and the relationship between the rising-water flow velocity and the magnetic field …Web

Chiral Nematic Cellulose Nanocrystals-Magnetite Nanocomposite Films Displaying Magnet-modulated Circular Dichroism Activity Download PDF. Ping Li 1, Xu Yu 2 & Yan Xu 1 133 ... A Practical Guide to Magnetic Circular Dichroism Spectroscopy, John Wiley & Sons, New York, 2007.Web

The purpose of the present experimental study is to investigate the forced magneto-convection of the Fe 3 O 4 /H 2 O ferrofluid flowing along smooth and dimpled tubes implemented with alternating magnetic field (B = 0.16 T and f = 5 Hz). All experiments were carried out for the working fluids pure water and ferrofluid with 1.0% volume fraction …Web

At ambient conditions magnetite crystallizes in the inverse spinel cubic structure (Fig. 1 ), containing Fe 3+ ions in the sites with …Web

At H = 0.007 T, the magnetite circle shrunk, while the quartz particles contacted the magnetite particles in the circular chain. At H = 0.011 T, the circular chain became a compact coagulate, in which the quartz particles were really entrained. The degree of the wrapping depends on magnetic field intensity.Web

In this study, we demonstrate that optical magnetic circular dichroism (OMCD) in Faraday geometry can serve as an effective means of characterizing the valence electronic structure of magnetic ...Web

Circular dichroism (CD) is a standard method for the analysis of biomolecular conformation. It is very reliable when applied to molecules, but requires relatively large amounts of solution.Web

Assuming that this was all magnetite, magnetite occupied at least 1.95% of the surface. This is comparable to the value of 3.7 ± 1.7 vol.% for the nine samples in the sample catcher-C, analyzed ...Web

Magnetite pellets were present in both spinel and magnetite areas, where the particle size of spinel area was less than 0.4 μm, while that of magnetite area was 0.5–3 μm. Most magnetite islands were roughly circular. The outer composite structure of magnetite was a relatively dense layer, but it had many arches and pores.Web

Magnetite. 54–56 Nanomagnetite-supported in the field of heterogeneous catalysts are established as a multipurpose materials for heterogeneous catalysis field for fulfillment separation and recycling of costly and rare catalysts at the wide scale of usage. ... Not only small-molecule, circular polarization of light can also be used as a ...Web

Two circular 2.5 cm diameter epoxy grain mounts containing between 200 and 203 randomly selected magnetite grains (0.25–2.0 mm) from the ferromagnetic fraction were prepared from six stream sediment samples (see Fig. 2 for geographic locations). Two epoxy grain mounts were also prepared with 603 magnetite grains randomly selected …Web

Shahsavar et al. [29] analyzed the irreversibilities of water-magnetite/CNT flow within the eccentric annulus and noticed that Rayleigh numbers and nanoparticle concentration amplify the hear transportation. Related circular convective nanofluid flows are traced in [[30], [31], [32]].Web