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 paper, a simple precipitation route was developed to synthesize magnetite (Fe3O4) nanoparticles with controlled size without any requirement of calcination step at high temperatures.
164 citations
TL;DR: In this article, a magnetite powder composed of uniform sub-micrometer spherical particles has been successfully synthesized by a hydrothermal method at low temperature, which shows a stable and reversible capacity of over 900 mAhg −1 during up to 60 cycles and good rate capability.
163 citations
TL;DR: These crystalline nanoarchitectures of iron oxide that exhibit superparamagnetic behavior while still retaining the desirable bicontinuous pore-solid networks and monolithic nature of an aerogel are developed.
Abstract: We have developed crystalline nanoarchitectures of iron oxide that exhibit superparamagnetic behavior while still retaining the desirable bicontinuous pore−solid networks and monolithic nature of an aerogel. Iron oxide aerogels are initially produced in an X-ray-amorphous, high-surface-area form, by adapting recently established sol−gel methods using Fe(III) salts and epoxide-based proton scavengers. Controlled temperature/atmosphere treatments convert the as-prepared iron oxide aerogels into nanocrystalline forms with the inverse spinel structure. As a function of the bathing gas, treatment temperature, and treatment history, these nanocrystalline forms can be reversibly tuned to predominantly exhibit either Fe3O4 (magnetite) or γ-Fe2O3 (maghemite) phases, as verified by electron microscopy, X-ray and electron diffraction, microprobe Raman spectroscopy, and magnetic analysis. Peak deconvolution of the Raman-active Fe−O bands yields valuable information on the local structure and vacancy content of the va...
163 citations
TL;DR: Strong sorption of the hydrophobic organic contaminant phenanthrene to the activated carbon or biochar surfaces was maintained following magnetite impregnation, while phenol sorption was diminished, probably due to enhanced carbon oxidation.
163 citations
TL;DR: In this article, the authors measured initial magnetic susceptibility χ0 in grown and natural magnetite crystals ranging from 0.09 μm to 6 mm in grain size and found that the presented initial susceptibilities are essentially independent of grain size.
162 citations