Shape-Controlled Growth and Shape-Dependent Cation Site Occupancy of Monodisperse Fe<sub>3</sub>O<sub>4</sub> Nanoparticles

Ho, Chien-Hsin; Tsai, Chun-An; Chung, Chia-Chi; Tsai, Chun-Ying; Chen, Fu‐Rong; Lin, Hong‐Ji; Lai, Chih‐Huang

doi:10.1021/cm102758u

Cited by 93 publications

(64 citation statements)

References 42 publications

(29 reference statements)

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“…Pure magnetite MNP synthesis under ambient conditions is notoriously difficult to control, with simple precipitations often resulting in a mixture of differently sized and shaped particles with other iron oxide contaminants. This situation can be improved somewhat by using more extreme processes, such as high-temperature incubations or capping surfactants, which favor certain MNP types (5,6). However, the use of toxic or organic reagents and extreme conditions comes with a high energy and monetary cost, and can limit the biocompatibility of the MNPs for subsequent applications.…”

mentioning

confidence: 99%

Self-assembled MmsF proteinosomes control magnetite nanoparticle formation in vitro

Rawlings

Bramble

Walker

et al. 2014

Proc. Natl. Acad. Sci. U.S.A.

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Magnetotactic bacteria synthesize highly uniform intracellular magnetite nanoparticles through the action of several key biomineralization proteins. These proteins are present in a unique lipidbound organelle (the magnetosome) that functions as a nanosized reactor in which the particle is formed. A master regulator protein of nanoparticle formation, magnetosome membrane specific F (MmsF), was recently discovered. This predicted integral membrane protein is essential for controlling the monodispersity of the nanoparticles in Magnetospirillum magneticum strain AMB-1. Two MmsF homologs sharing over 60% sequence identity, but showing no apparent impact on particle formation, were also identified in the same organism. We have cloned, expressed, and used these three purified proteins as additives in synthetic magnetite precipitation reactions. Remarkably, these predominantly α-helical membrane spanning proteins are unusually highly stable and water-soluble because they self-assemble into spherical aggregates with an average diameter of 36 nm. The MmsF assembly appears to be responsible for a profound level of control over particle size and iron oxide (magnetite) homogeneity in chemical precipitation reactions, consistent with its indicated role in vivo. The assemblies of its two homologous proteins produce imprecise various iron oxide materials, which is a striking difference for proteins that are so similar to MmsF both in sequence and hierarchical structure. These findings show MmsF is a significant, previously undiscovered, protein additive for precision magnetite nanoparticle production. Furthermore, the self-assembly of these proteins into discrete, soluble, and functional "proteinosome" structures could lead to advances in fields ranging from membrane protein production to drug delivery applications.MmsF | proteinosome | magnetite | magnetosome | in vitro precipitation M agnetic nanoparticles (MNPs) represent an area of intense research due to their diverse and pertinent applications across a range of disciplines and industries. Applications for MNPs include biomedical diagnostics and therapies (1-3), such as MRI contrast reagents, tumor hyperthermia treatments, and magnetically targeted drug delivery, as well as data storage (4) and biotechnology. However, specific magnetic and physical properties of MNPs are critical to the success of each application, with specific size and morphology (with a narrow distribution) being essential considerations. Pure magnetite MNP synthesis under ambient conditions is notoriously difficult to control, with simple precipitations often resulting in a mixture of differently sized and shaped particles with other iron oxide contaminants. This situation can be improved somewhat by using more extreme processes, such as high-temperature incubations or capping surfactants, which favor certain MNP types (5, 6). However, the use of toxic or organic reagents and extreme conditions comes with a high energy and monetary cost, and can limit the biocompatibility of the MNPs for subsequent app...

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mentioning

confidence: 99%

Self-assembled MmsF proteinosomes control magnetite nanoparticle formation in vitro

Rawlings

Bramble

Walker

et al. 2014

Proc. Natl. Acad. Sci. U.S.A.

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“…In this case, the formed monomer was more rapidly consumed and the formed MnFe 2 O 4 nanoparticles earlier entered into kinetic control growth process from thermodynamic control reaction. The typical spinel structure of ferrite nanocrystal is based on a face-centered cubic (fcc) model with three low-energy facets, {100}, {110}, and {111} [17] (Figure 3(b)). The {111} planes possess the highest surface energy.…”

Section: Resultsmentioning

confidence: 99%

Influence of Reaction Solvent on Crystallinity and Magnetic Properties of MnFe₂O₄Nanoparticles Synthesized by Thermal Decomposition

Song

Yan

Zhang

et al. 2016

Journal of Nanomaterials

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This study reports the synthesis of three kinds of manganese-doped magnetic ferrite nanoparticles (MnFe 2 O 4 ) in benzyl ether, octyl ether, and 1-octadecene by a simple and low cost thermal decomposition method. It was found that benzyl ether results in a dramatic improvement in nanoparticle crystallinity owing to its stronger reducibility compared to octyl ether and 1-octadecene, as demonstrated by X-ray diffraction and TEM measurements. Raman spectroscopy detection also indicated that the reducing solvent of benzyl ether was in favor of forming magnetite-like structure ferrite, while maghemite-like structured ferrite was obtained in octyl ether and 1-octadecene. The saturation magnetization ( ) of MnFe 2 O 4 synthesized in benzyl ether was 85 emu/g [Fe], which was 3 and 5 times larger than MnFe 2 O 4 synthesized in octyl ether and 1-octadecene, respectively. The specific absorption rate (SAR) of MnFe 2 O 4 nanoparticles synthesized in benzyl ether was 574 W/g, while MnFe 2 O 4 nanoparticles synthesized in octyl ether and 1-octadecene have had much smaller SAR of 76 and 33 W/g, respectively. MnFe 2 O 4 nanoparticles synthesized in benzyl ether also exhibit higher relaxivity ( 2 = 207 mM −1 s −1 ) than those synthesized in octyl ether and 1-octadecene ( 2 = 65 and 22 mM −1 s −1 ). It was obvious that MnFe 2 O 4 nanoparticles synthesized in reducing benzyl ether have higher crystallinity and thus higher , SAR, and 2 values, which can serve as a better candidate for hyperthermia and magnetic resonance imaging.

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“…Some irregular spherical-like crystals were obtained when the addition of alkali was increased to 12.5 mmol (Figure 3(d)). The sizes of the four products decreased upon increasing the alkali content, which should result from the fast nucleation and growth rate along different facets [23]. In addition, the results also reveal that, upon increasing the amount of OH − in the solution, the Fe 3 O 4 shapes transform into high-energy dodecahedrons.…”

Section: Effect Of Naoh Concentrationmentioning

confidence: 88%

Shape-Evolution and Growth Mechanism of Fe₃O₄Polyhedrons

Chen

Zhou

Xiong

et al. 2015

Advances in Materials Science and Engineering

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The shape evolution of spinel-structured Fe 3 O 4 was systematically investigated using a one-pot solvothermal route. Using FeCl 3 ⋅6H 2 O as the precursor, triangular and hexagonal plates, octahedrons, dodecahedrons, and spherical Fe 3 O 4 were obtained by selecting the adequate ration of NaOH, N 2 H 4 ⋅H 2 O, Fe 3+ , and EDTA. The slow nucleation and growth rate favor the formation of low energy plate-like products, and the spherical crystals are obtained as the result of extremely fast nucleation and growth rate. It is also suggested that the generating rate of Fe(II) reduced from Fe(III) probably affects the growth speed along different facets, further influencing the final size and shape of the produced crystals.

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Shape-Controlled Growth and Shape-Dependent Cation Site Occupancy of Monodisperse Fe₃O₄ Nanoparticles

Cited by 93 publications

References 42 publications

Self-assembled MmsF proteinosomes control magnetite nanoparticle formation in vitro

Self-assembled MmsF proteinosomes control magnetite nanoparticle formation in vitro

Influence of Reaction Solvent on Crystallinity and Magnetic Properties of MnFe₂O₄Nanoparticles Synthesized by Thermal Decomposition

Shape-Evolution and Growth Mechanism of Fe₃O₄Polyhedrons

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Shape-Controlled Growth and Shape-Dependent Cation Site Occupancy of Monodisperse Fe3O4 Nanoparticles

Cited by 93 publications

References 42 publications

Self-assembled MmsF proteinosomes control magnetite nanoparticle formation in vitro

Self-assembled MmsF proteinosomes control magnetite nanoparticle formation in vitro

Influence of Reaction Solvent on Crystallinity and Magnetic Properties of MnFe2O4Nanoparticles Synthesized by Thermal Decomposition

Shape-Evolution and Growth Mechanism of Fe3O4Polyhedrons

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Shape-Controlled Growth and Shape-Dependent Cation Site Occupancy of Monodisperse Fe₃O₄ Nanoparticles

Influence of Reaction Solvent on Crystallinity and Magnetic Properties of MnFe₂O₄Nanoparticles Synthesized by Thermal Decomposition

Shape-Evolution and Growth Mechanism of Fe₃O₄Polyhedrons