2013
DOI: 10.1371/journal.pone.0057070
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Formation of Magnetite Nanoparticles at Low Temperature: From Superparamagnetic to Stable Single Domain Particles

Abstract: The room temperature co-precipitation of ferrous and ferric iron under alkaline conditions typically yields superparamagnetic magnetite nanoparticles below a size of 20 nm. We show that at pH  =  9 this method can be tuned to grow larger particles with single stable domain magnetic (> 20–30 nm) or even multi-domain behavior (> 80 nm). The crystal growth kinetics resembles surprisingly observations of magnetite crystal formation in magnetotactic bacteria. The physicochemical parameters required for mineralizati… Show more

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Cited by 112 publications
(83 citation statements)
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“…They can be handled by using an external magnetic field and thus directed to a specific area in the body where they then excrete the medicine, avoiding delivery to unwanted tissues. MNPs can be formed either from pure metals (cobalt, nickel, manganese and iron) or alloys and their oxides [32]. However, only the iron oxide MNPs have been approved for clinical use by the Food and Drug Administration due to their inherent properties [29].…”
Section: Antimicrobial Approaches Based On Nanotechnologymentioning
confidence: 99%
“…They can be handled by using an external magnetic field and thus directed to a specific area in the body where they then excrete the medicine, avoiding delivery to unwanted tissues. MNPs can be formed either from pure metals (cobalt, nickel, manganese and iron) or alloys and their oxides [32]. However, only the iron oxide MNPs have been approved for clinical use by the Food and Drug Administration due to their inherent properties [29].…”
Section: Antimicrobial Approaches Based On Nanotechnologymentioning
confidence: 99%
“…HRTEM analysis has produced a wealth of knowledge about the iron oxide formation in biological and synthetic systems alike. The "freeze and look" approach proved a very effective tool for evaluation of the complex synthetic pathways, notably the biomimetic formation of the nanoscale magnetite [165][166][167][168][170][171][172][173][174][175][176]. Importantly, the mechanism of biomimetic iron oxide formation remains unclear, largely because the analysis of the formed biomimetic solid is carried out either postsynthesis [6,21,22,34,44,78,177] or is performed on aliquots sampled during different stages of the growth process [165,166,171,173,[178][179][180][181][182].…”
Section: The Near In Situ Approachmentioning
confidence: 99%
“…Nanostructures exhibit unique physicochemical and biological properties, which makes them a favorable material for biomedical applications. 26,29 Nanoscale structures, or nanosized structures, can be used to carry drugs such as liposomes, synthetic and natural polymers, inorganic and metal NPs, dendrimers, silica, and carbon materials, as well as magnetic NPs (MNPs) 30,31 ( Figure 2). …”
mentioning
confidence: 99%