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What is the grow mechanism of magnetite nanoparticles? 


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The growth mechanism of magnetite nanoparticles involves various pathways and factors. One significant pathway is the formation of iron hydroxide Fe(OH)2 followed by its dehydration into lepidocrocite (γ-FeOOH), ultimately leading to magnetite formation . Another approach involves the addition of poly(arginine) to stabilize an amorphous ferrihydrite precursor, shifting the pathway to kinetic control and allowing for size and morphology control of magnetite nanoparticles . Additionally, the synthesis of iron oxide nanoparticles from organometallic precursors involves the formation of Fe-O-Fe bridges and radicals, leading to the growth of nanoparticles with different stoichiometries like wustite, magnetite, and maghemite . These diverse mechanisms highlight the complexity and versatility in controlling the growth of magnetite nanoparticles through various synthetic routes.

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The growth mechanism of magnetite nanoparticles involves co-precipitation with NaNO3 addition, leading to size reduction, crystallite phase formation, and decreased magnetization, as confirmed by XRD and VSM analysis.
The formation of magnetite nanoparticles involves the electrochemical generation of iron hydroxide Fe(OH)2 in the presence of oxygen, leading to lepidocrocite (γ-FeOOH) and subsequent dehydration.
The growth mechanism of magnetite nanoparticles involves stabilizing an amorphous ferrihydrite precursor with poly(arginine), shifting the pathway from thermodynamic to kinetic control, allowing for size and morphology control.
Not addressed in the paper.

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What are the different mechanisms of nanocrystal nucleation and growth?5 answersNanocrystal nucleation and growth can occur through different mechanisms. In the case of zirconia nanocrystals, nucleation is believed to occur through a second-order process, where small amorphous particles act as the source of nanocrystal growth. Gold nanocrystal growth involves the formation of poorly crystalline nanoparticles, which then undergo nanocrystallization through multiple exchanges of matter between a crystalline core and a disordered shell. The formation of nanocrystals of the charge transfer compound perylene:7,7′,8,8′-tetracyanoquinodimethane (TCNQ) can exhibit non-classical nucleation, with solid particles forming immediately and longer-range order appearing later. The nucleation and growth of platinum nanocrystals involve the formation and growth of amorphous clusters, followed by crystallization and growth of clusters, and the ripening of nanocrystals. These different mechanisms of nucleation and growth provide insights into the processes involved in the formation and evolution of nanocrystals.
What is the size of maghemite particle?5 answersThe size of maghemite particles varies depending on the synthesis method and conditions. In one study, the mean physical size of the nanoparticles was found to be 9.5 nm. Another study reported maghemite particles with sizes in the range of 2.5-5.6 nm. Additionally, a patent mentioned magnetite particles with a diameter between 10 and 50 nm. Furthermore, porous crystals of maghemite were obtained with inner grain sizes of 64±6 nm and 84±8 nm. These findings indicate that maghemite particles can have sizes ranging from a few nanometers to tens of nanometers.
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