Topic
Magnetite
About: Magnetite is a research topic. Over the lifetime, 10277 publications have been published within this topic receiving 278071 citations.
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TL;DR: In this article, the preparation and analysis of a highly concentrated hydrophobic oleic acid-coated magnetite gel was described, which exhibited superparamagnetism with a saturation magnetization of 46.0 emu/g.
186 citations
TL;DR: It is found that HA can adsorb to magnetite particles hence modifying their surface charge status, and fast aggregation, independent of solution chemistry, took place when the pH is close to the point zero charge (PZC) and the ionic strength is above the critical coagulation concentration (CCC).
184 citations
TL;DR: In this paper, the geochemistry of magnetite from the Cretaceous Kiruna-type Los Colorados IOA deposit in Chile has been studied using laser ablation-inductively coupled plasma mass spectroscopy (LA-ICP-MS) transects and electron probe micro-analyzer (EPMA) wavelength-dispersive X-ray (WDX) spectrometry mapping.
183 citations
TL;DR: In this paper, the authors investigate mechanisms and biogeochemical processes occurring during magnetite reduction by the DIRB, Shewanella putrefaciens strains CN32 and MR-1.
182 citations
TL;DR: In this article, a new synthesis of the magnetic protein magnetoferritin was reported, where the number of stepwise cycles of the Fe(II)/oxidant additions produces biomimetic proteins with different iron loadings and concomitant changes in the size of the inorganic nanocores.
Abstract: A new synthesis of the magnetic protein magnetoferritin is reported. Addition of increments of Fe(II) to anaerobic solutions of the demetalated protein, apoferritin, at pH = 8.6 and 65 °C, followed by stoichiometric amounts of the oxidant trimethylamine-N-oxide (Me3NO), results in the formation of a dispersed magnetic bioinorganic nanocomposite. By limiting the Fe:protein ratio to not more than ∼140 atoms/protein molecule and the Fe(II):Me3NO ratio to 3:2 in each increment, ferrimagnetic nanocrystals of magnetite/maghemite (Fe3O4)/(γ-Fe2O3) are synthesized in the 8 nm diameter protein cage. Controlling the number of stepwise cycles of the Fe(II)/oxidant additions produces biomimetic proteins with different iron loadings (100, 260, 530, 1000, 2040, and 3150 Fe atoms/protein molecule) and concomitant changes in the size of the inorganic nanocores. Magnetoferritins prepared with less than 1000 Fe atoms/molecule were discrete nanocomposites with protein-encapsulated magnetic cores. Samples with higher iron lo...
182 citations