ultrafine magnetite production
Welcome to the broken dawn

ultrafine magnetite production

Microbial production of ultrafine-grained magnetite by ...

Microbial production of ultrafine-grained magnetite by fermentation processes at room temperature. Roh Y(1), Kim Y, Lee S, Jang H, Suh Y. Author information: (1)Faculty of Earth Systems and Environmental Sciences, Chonnam National University, Gwangju 500-757, Korea.

Microbial production of ultrafine-grained magnetite ...

Sep 23, 1988  Unlike prior art production of magnetite using magnetotactic bacteria, GS-15 is able to produce large amounts of ultrafine-grained magnetite extracellularly under anaerobic conditions, allowing for easy separation and recovery of the magnetite without the need for rigorous control over oxygen tensions in the culture medium.

Anaerobic production of magnetite by a dissimilatory iron ...

The production of ultrafine-grained magnetite by magnetotactic bacteria in surficial aerobic sediments may contribute significantly to the natural remanent magnetism of sediments2-4. However, recent studies on iron reduction in anaerobic sediments suggested that bacteria can also generate magnetite in the absence of oxygen5.

Pure ultrafine magnetite from carbon steel wastes ...

Jan 01, 2019  This paper proposes a straightforward air-aqueous oxidation of St3 steel wastes for mass production of pure ultrafine magnetite. The characterization of the obtained product has been made by X-ray fluorescence analysis, X-ray diffraction, impedance spectroscopy, low-temperature nitrogen absorption method, Mössbauer spectroscopy and optical microscopy.

Anaerobic production of magnetite by a dissimilatory iron ...

Nov 19, 1987  The production of ultrafine-grained magnetite by magnetotactic bacteria in surficial aerobic sediments may contribute significantly to the natural remanent magnetism of sediments 2–4.

Microbial production of ultrafine-grained magnetite ...

Unlike prior art production of magnetite using magnetotactic bacteria, GS-15 is able to produce large amounts of ultrafine-grained magnetite extracellularly under anaerobic conditions, allowing for easy separation and recovery of the magnetite without the need for rigorous control over oxygen tensions in the culture medium.

Microbial Production of Ultrafine-Grained Magnetite by ...

Microbial Production of Ultrafine-Grained Magnetite by Fermentation Processes at Room Temperature November 2008 Journal of Nanoscience and Nanotechnology 8(10):5216-9

Pure ultrafine magnetite from carbon steel wastes ...

Jan 01, 2019  This paper proposes a straightforward air-aqueous oxidation of St3 steel wastes for mass production of pure ultrafine magnetite. The characterization of the obtained product has been made by X-ray fluorescence analysis, X-ray diffraction, impedance spectroscopy, low-temperature nitrogen absorption method, Mössbauer spectroscopy and optical microscopy.

Anaerobic production of magnetite by a dissimilatory iron ...

Nov 19, 1987  The production of ultrafine-grained magnetite by magnetotactic bacteria in surficial aerobic sediments may contribute significantly to the natural remanent magnetism of sediments 2–4.

US6083476A - Black ultrafine magnetite particles and ...

Black ultrafine magnetite particles of this invention have an FeO content of 31 to 35% and a particle size of 0.1 μm or less. A process for producing the black ultrafine magnetite particles comprises dispersing ultrafine magnetite particles with a particle size of 0.1 μm or less in water containing ferrous hydroxide, aging the dispersion of 90 to 200° C. at a free alkali concentration of 1 ...

Protein assisted hydrothermal synthesis of ultrafine ...

A facile and green route is presented for mass production of oriented magnetite porous fibers (with >96% in yield), based on the protein assisted hydrothermal method in citric aqueous solution. The magnetite fibers are nearly cylindrical in shape, several ten micrometres in length and 120 nm in mean diameter. The whole single fibers are packed by the ultrafine Fe 3 O 4 nanoparticles with ...

Ultrafine Magnetite Nanopowder: Synthesis ...

Magnetite (Fe 3 O 4 ) nanoparticles prepared by microwave-assisted hydrothermal synthesis have been characterized in terms of morphological and structural features. Electron micrographs collected in both scanning (SEM) and transmission (TEM) modes and evaluations of X-ray powder diffraction (XRD) patterns have indicated the achievement of a monodispersed crystallite structure with particles ...

Frontiers Ultrafine Magnetic Particles: A DIET-Proxy in ...

Other non-DIET reactions with Fe(III) reducing bacteria such as Geothrix with may also have a role in the production of magnetite (Klueglein et al., 2013) and there may be some syntrophy with Methanosaeta (Sutcliffe et al., 2018). Conclusion. Magnetic properties measurements revealed the ultrafine magnetic particles occurrence in a brownfield site.

[PDF] Anaerobic Production Of Magnetite By A Dissimilatory ...

The production of ultrafine-grained magnetite by magnetotactic bacteria in surficial aerobic sediments may contribute significantly to the natural remanent magnetism of sediments2–4. However, recent studies on iron reduction in anaerobic sediments suggested that bacteria can also generate magnetite in the absence of oxygen5.

Magnetite - Wikipedia

Magnetite is a mineral and one of the main iron ores, with the chemical formula Fe 3 O 4.It is one of the oxides of iron, and is ferrimagnetic; it is attracted to a magnet and can be magnetized to become a permanent magnet itself. It is the most magnetic of all the naturally occurring minerals on Earth. Naturally magnetized pieces of magnetite, called lodestone, will attract small pieces of ...

The formation of magnetite in the early Archean oceans ...

May 15, 2017  TEM characterization of the evolution of mineral phases from GR to magnetite in experiments of synthetic ferrihydrite reacted with Fe(II) under strictly anaerobic condition. (A) The formation of GR. (B) The emergence of ultrafine magnetite crystals after the dissolution of GR. (C) Magnetite on the spike rich matrix.

Microbial Production of Ultrafine-Grained Magnetite by ...

Oct 10, 2008  A method of producing magnetite nanoparticles was developed through culturing a microorganism designated Haejae-1, Shewanella sp., in the presence of glucose and akaganeite (β-FeOOH).Haejae-1 isolated from inter-tidal flat sediments was able to produce copious amount of ultrafine magnetite via glucose fermentation extracellularly under anaerobic conditions at room

The use of flotation to separate fine coal and ultrafine ...

@article{osti_110014, title = {The use of flotation to separate fine coal and ultrafine magnetite from dense-medium cyclone products}, author = {Polat, M and Klima, M S and Chander, S and Ahuja, G}, abstractNote = {A study was conducted to investigate the use of flotation in combination with dense-medium cycloning utilizing ultrafine ({minus}10 {micro}m) magnetite, as an integrated process for ...

Microbial Production of Ultrafine-Grained Magnetite by ...

Oct 10, 2008  A method of producing magnetite nanoparticles was developed through culturing a microorganism designated Haejae-1, Shewanella sp., in the presence of glucose and akaganeite (β-FeOOH).Haejae-1 isolated from inter-tidal flat sediments was able to produce copious amount of ultrafine magnetite via glucose fermentation extracellularly under anaerobic conditions at room

Anaerobic production of magnetite by a dissimilatory iron ...

Nov 19, 1987  The production of ultrafine-grained magnetite by magnetotactic bacteria in surficial aerobic sediments may contribute significantly to the natural remanent magnetism of sediments 2–4.

US6083476A - Black ultrafine magnetite particles and ...

Black ultrafine magnetite particles of this invention have an FeO content of 31 to 35% and a particle size of 0.1 μm or less. A process for producing the black ultrafine magnetite particles comprises dispersing ultrafine magnetite particles with a particle size of 0.1 μm or less in water containing ferrous hydroxide, aging the dispersion of 90 to 200° C. at a free alkali concentration of 1 ...

A review of principles and applications of magnetic ...

ultrafine magnetic particles Liqun Luo, Anh V Nguyen PII: S1383-5866(16)31055-3 ... Please note that during the production process ... interaction between two spherical paramagnetic fine particles or two magnetite ultrafine particles. 2.1 External forces

[PDF] Anaerobic Production Of Magnetite By A Dissimilatory ...

The production of ultrafine-grained magnetite by magnetotactic bacteria in surficial aerobic sediments may contribute significantly to the natural remanent magnetism of sediments2–4. However, recent studies on iron reduction in anaerobic sediments suggested that bacteria can also generate magnetite in the absence of oxygen5.

The use of flotation to separate fine coal and ultrafine ...

@article{osti_110014, title = {The use of flotation to separate fine coal and ultrafine magnetite from dense-medium cyclone products}, author = {Polat, M and Klima, M S and Chander, S and Ahuja, G}, abstractNote = {A study was conducted to investigate the use of flotation in combination with dense-medium cycloning utilizing ultrafine ({minus}10 {micro}m) magnetite, as an integrated process for ...

The formation of magnetite in the early Archean oceans ...

May 15, 2017  TEM characterization of the evolution of mineral phases from GR to magnetite in experiments of synthetic ferrihydrite reacted with Fe(II) under strictly anaerobic condition. (A) The formation of GR. (B) The emergence of ultrafine magnetite crystals after the dissolution of GR. (C) Magnetite on the spike rich matrix.

Continuous production of nanosized magnetite through low ...

Geological processes, such as burial, can lead to remagnetization in rocks due to neoformed magnetic minerals that have passed a critical volume, called blocking volume. In this study, we designed a heating experiment for claystones obtained from the Paris Basin (France), in the 50-130°C temperature range, in order to simulate lt;4 km burial remagnetization. At a given temperature, remanence ...

Facile production of ultra-fine silicon nanoparticles ...

As a result of the SiNP production steps, we obtain two intermediate materials: a (HSiO 1.5) n polymer precursor and a silicon-silica composite, and ultimately ultra-fine silicon nanoparticles. The (HSiO 1.5 ) n polymer precursor in the form of a white powder as a result of thermal processing, is transformed into a dark brown solid.

Magnetite Formation During Microbial Dissimilatory Iron ...

During the initial studies with these Fe(III)-reducing organisms it was discovered that ultrafine-grained magnetite is an endproduct of dissimilatory Fe(III) reduction. Keywords Sedimentary Environment Ferric Iron Band Iron Formation Magnetotactic Bacterium Anaerobic Sediment

Inorganic Formation of Ultrafine-Grained Magnetite ...

Abstract. Within the last 15–20 years, an increasing number of environmental scientists have become interested in investigating the magnetic properties of a range of earth surface materials, from atmospheric dusts, soils, and all kinds of sediments — deep-sea, lacustrine, estuarine, terrestrial —, to organic tissues of insects, fish, even Man.

Perspective of Fe3O4 Nanoparticles Role in Biomedical ...

In order to achieve this aim, the dispersed ultra-fine magnetite particles should be stabilized in aqueous or other organic fluids [17, 18]. Generally, the fabrication of magnetic fluid is divided into two steps: the first step is the magnetic nanoparticles synthesis process and the second one is the stabilization of particles in the fluid by ...

Magnetite pollution nanoparticles in the human brain PNAS

Sep 27, 2016  Abstract. Biologically formed nanoparticles of the strongly magnetic mineral, magnetite, were first detected in the human brain over 20 y ago [Kirschvink JL, Kobayashi-Kirschvink A, Woodford BJ (1992) Proc Natl Acad Sci USA 89(16):7683–7687]. Magnetite can have potentially large impacts on the brain due to its unique combination of redox activity, surface charge, and strongly magnetic

Copyright © 2021.Company name All rights reserved.Dawn Broken