Little Adjustments Significantly Simplify the Gram-Scale Synthesis of High-Quality Iron Oxide Nanocubes

Kampferbeck, Michael; Klauke, Lea R.; Weller, Horst; Voßmeyer, Tobias

doi:10.1021/acs.langmuir.1c01456

Cited by 4 publications

(2 citation statements)

References 48 publications

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“…Based on the gathered information, it was possible to determine the most frequently obtained form of the structures containing FeO (Table 2). This form is FeO NPs produced for biomedical applications via various chemical or physical routes, but not naturally originated, since this iron oxide compound is metastable under normal conditions [42, [74][75][76][77][78][79][80].…”

Section: Mechanisms Of Iron Oxide Formationmentioning

confidence: 99%

Diversity of Iron Oxides: Mechanisms of Formation, Physical Properties and Applications

Гареев

2023

Magnetochemistry

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Iron oxide compounds have naturally formed during the whole of Earth’s history. Synthetic compositions with iron oxides are produced with the use of various techniques and widely used for scientific and applied purposes. This review considers an attempt to classify all the information on different iron oxide compound formation mechanisms and intended applications in biomedicine, catalysis, waste remediation, geochemistry, etc. All the literature references analyzed were divided into several groups by their number of included iron oxide compounds: compositions containing only one compound (e.g., magnetite or wüstite), including various polymorphs of iron(III) oxide (α-, β-, γ-, ε-, ζ-, δ-Fe2O3); compositions with two different distinguishable iron oxide phases (e.g., maghemite and hematite); compositions containing non-crystalline phases (amorphous iron oxide or atomic clusters); and compositions with mixed iron oxide phases (indistinguishable separate iron oxide phases). Diagrams on the distribution of the literature references between various iron oxide compounds and between various applications were built. Finally, the outlook on the perspectives of further iron oxide studies is provided.

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Section: Mechanisms Of Iron Oxide Formationmentioning

confidence: 99%

Diversity of Iron Oxides: Mechanisms of Formation, Physical Properties and Applications

Гареев

2023

Magnetochemistry

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“…Therefore, in materials such as nanowire arrays fabricated by the cylinder-forming BCPs, the cross-section of each single nanowire in the arrays is evidently circular. However, in recent years, large amounts of novel nanomaterials with nanostructure units having noncircular cross-sections are coming forth and showing a trend of rapid development. − Compared with nanostructure units that have circular cross-sections, nanostructure units with noncircular cross-sections, such as nanocube and rectangular nanobar (Figure b), have two unique features: (1) nanostructure units with noncircular cross-sections have shape anisotropies (e.g., square cross-section in Figure b), hence have different confined states of surface electrons and different surface plasmonic resonance features due to different curvatures on their surfaces; (2) nanostructure units with shape anisotropies can display various relative arrangements such as edge-to-edge, edge-to-corner, and corner-to-corner arrangements (Figure c), which apparently do not exist in nanostructure units with circular cross-sections. Both different confined states of the surface electrons and different relative arrangements endow materials possessing shape anisotropic nanostructure units with novel properties and functions.…”

Section: Introductionmentioning

confidence: 99%

Rectangular Cylinders Formed by Compositionally Bidisperse ABC Triblock Terpolymer Blends: A Self-Consistent Field Theory Study

et al. 2021

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Compared with traditional cylinders that have circular cross-sections, cylinders with rectangular cross-sections can endow nanomaterials with various novel optical properties and functions. In this work, the formation of the rectangular cylinders self-assembled by compositionally bidisperse ABC triblock terpolymer blends has been investigated via numerical simulations based on self-consistent field theory. The specially designed blending systems are composed of two types of linear ABC triblock terpolymers that have the same total chain lengths and the middle B block chain lengths, but different chain lengths of the side A/C blocks. By tuning the chain length fractions and the interactions between different blocks, rectangular cylinders with a fourfold symmetry pattern were successfully obtained in our simulations. Each rectangular phase domain is self-assembled together by the short and long side blocks of the same species. The simulation results indicate that the selective aggregation of the short side blocks determines the formation of the rectangular cylindrical phase, i.e., the short side blocks prefer to aggregate at the four corners within a rectangular cylindrical phase domain. This simulation result reveals a formation mechanism that is different from the mechanism proposed in previous experiments [Asai et al. ACS Macro Lett., 2014, 3, 166−169]. Moreover, under different middle B block chain length fractions, phase diagrams as a function of the interaction parameter between different blocks and the short side block chain length fraction have been constructed. The phase diagrams show that the parameter window of the rectangular cylinders is considerably expanded by increasing the chain length fraction of the middle B blocks. Our simulation works can provide a theoretical basis for molecular design to regulate and fabricate nanomaterials with nontraditional phase domains in future experiments.

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Magnetic Tunability via Control of Crystallinity and Size in Polycrystalline Iron Oxide Nanoparticles

Nguyen,

Deng,

Lee

et al. 2024

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Iron oxide nanoparticles (IONPs) are widely used for biomedical applications due to their unique magnetic properties and biocompatibility. However, the controlled synthesis of IONPs with tunable particle sizes and crystallite/grain sizes to achieve desired magnetic functionalities across single‐domain and multi‐domain size ranges remains an important challenge. Here, a facile synthetic method is used to produce iron oxide nanospheres (IONSs) with controllable size and crystallinity for magnetic tunability. First, highly crystalline Fe3O4 IONSs (crystallite sizes above 24 nm) having an average diameter of 50 to 400 nm are synthesized with enhanced ferrimagnetic properties. The magnetic properties of these highly crystalline IONSs are comparable to those of their nanocube counterparts, which typically possess superior magnetic properties. Second, the crystallite size can be widely tuned from 37 to 10 nm while maintaining the overall particle diameter, thereby allowing precise manipulation from the ferrimagnetic to the superparamagnetic state. In addition, demonstrations of reaction scale‐up and the proposed growth mechanism of the IONSs are presented. This study highlights the pivotal role of crystal size in controlling the magnetic properties of IONSs and offers a viable means to produce IONSs with magnetic properties desirable for wider applications in sensors, electronics, energy, environmental remediation, and biomedicine.

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Little Adjustments Significantly Simplify the Gram-Scale Synthesis of High-Quality Iron Oxide Nanocubes

Cited by 4 publications

References 48 publications

Diversity of Iron Oxides: Mechanisms of Formation, Physical Properties and Applications

Diversity of Iron Oxides: Mechanisms of Formation, Physical Properties and Applications

Rectangular Cylinders Formed by Compositionally Bidisperse ABC Triblock Terpolymer Blends: A Self-Consistent Field Theory Study

Magnetic Tunability via Control of Crystallinity and Size in Polycrystalline Iron Oxide Nanoparticles

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