Self-assembly of iron oxide nanoparticles into oriented nanosheets by one-pot template-free synthesis at low pH

Guan, Ningning; Sun, Dejun; Xu, Jian

doi:10.1016/j.matlet.2009.02.046

Cited by 15 publications

(3 citation statements)

References 15 publications

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“…A previous study by Guan et al pointed out that the attachment of Fe 3 O 4 nanoparticles along (220) direction could be induced by the magnetic structure of fcc Fe 3 O 4 nanocrystals. 26 The perfect lattice match of these two nanoparticles (particle 1, 2 indicated by red circle in Fig. 3b) confirms the same orientation of adjacent nanoparticles in a small crystalline domain.…”

Section: Resultssupporting

confidence: 54%

Dipole-directed assembly of Fe₃O₄nanoparticles into nanorings via oriented attachment

Xing

Wang

2014

CrystEngComm

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We have developed a novel hydrothermal method to fabricate Fe 3 O 4 ring-like nanostructures via oriented attachment of Fe 3 O 4 nanoparticles through intermediate platelets with incorporation of inorganic salts. The obtained samples were characterized by X-ray diffraction (XRD) analysis, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), selective-area electron diffraction (SAED), high-resolution TEM (HRTEM) and vibrating-sample magnetometer (VSM). A reasonable mechanism based on the self-assembly of magnetic Fe 3 O 4 nanoparticles on graphene nanosheets using inorganic ions as crystal growth modifiers is proposed. The intrinsic dipoledipole interactions between the individual magnetic Fe 3 O 4 nanoparticles act as the driving force for nanoring formation. Saturation moment of the superparamagnetic Fe 3 O 4 nanorings is much higher than that of the corresponding disassembled nanoparticles. The enhancement of saturation moment is due to the oriented ring-like assembly with synergistic magnetism. This study could provide an additional tool for fabricating other nanostructures via oriented attachment.

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Section: Resultssupporting

confidence: 54%

Dipole-directed assembly of Fe₃O₄nanoparticles into nanorings via oriented attachment

Xing

Wang

2014

CrystEngComm

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“…In addition, results of control experiments showed that the presence of Fe 3 O 4 -associated organic substances was required for the generation of rod-like magnetite after the addition of noble metal precursor salts. It has been reported that, in the presence of externally added organic substances, Fe 3 O 4 nanoparticles can self-assemble into nanorods, nanowires or nanosheets without temple through the interplay and balance of dipolar force, electrostatic interaction and van der Waals force 16 41 42 . The self-assembly of Fe 3 O 4 nanoparticles into oriented nanosheets was achieved through using a hydrophilic terpolymer as stabilizer under low pH conditions 42 .…”

Section: Discussionmentioning

confidence: 99%

Microbial synthesis of Pd/Fe3O4, Au/Fe3O4 and PdAu/Fe3O4 nanocomposites for catalytic reduction of nitroaromatic compounds

Tuo

Liu

Dong

et al. 2015

Sci Rep

117

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Magnetically recoverable noble metal nanoparticles are promising catalysts for chemical reactions. However, the chemical synthesis of these nanocatalysts generally causes environmental concern due to usage of toxic chemicals under extreme conditions. Here, Pd/Fe3O4, Au/Fe3O4 and PdAu/Fe3O4 nanocomposites are biosynthesized under ambient and physiological conditions by Shewanella oneidensis MR-1. Microbial cells firstly transform akaganeite into magnetite, which then serves as support for the further synthesis of Pd, Au and PdAu nanoparticles from respective precursor salts. Surface-bound cellular components and exopolysaccharides not only function as shape-directing agent to convert some Fe3O4 nanoparticles to nanorods, but also participate in the formation of PdAu alloy nanoparticles on magnetite. All these three kinds of magnetic nanocomposites can catalyze the reduction of 4-nitrophenol and some other nitroaromatic compounds by NaBH4. PdAu/Fe3O4 demonstrates higher catalytic activity than Pd/Fe3O4 and Au/Fe3O4. Moreover, the magnetic nanocomposites can be easily recovered through magnetic decantation after catalysis reaction. PdAu/Fe3O4 can be reused in at least eight successive cycles of 4-nitrophenol reduction. The biosynthesis approach presented here does not require harmful agents or rigorous conditions and thus provides facile and environmentally benign choice for the preparation of magnetic noble metal nanocatalysts.

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“…Biomolecule-induced colloidal assembly plays an increasingly important role in biomedical applications due to the integration of unique physiochemical properties of nanoparticles (NPs) and bio-functions of proteins, enzymes, and DNA. − Among them, aggregates from the building block of magnetic nanocrystals functionalized with the protein corona exhibited high potential as a pivotal tool for both fundamental research and application-oriented research, such as biodetection and tissue engineering. − The ability to manipulate the anisotropic self-assembly of a colloidal system in the presence of protein has opened up an emerging route toward the development of smart materials with designable properties. , To date, a majority of colloidal assemblies with a threadlike morphology based on the magnetic NPs have been frequently realized through one of the typical external stimuli magnetic forces in a solution environment, in which the NP can be aligned along the magnetic force lines. − Instead, for tuning the anisotropic self-assembly behavior of small-size gold NPs and iron oxide nanocrystals, several categories of molecular interactions involving the interplay of anisotropic dipolar forces, electrostatic interaction, hydrophobic interaction, intramolecular hydrogen bonds, and isotropic van der Waals forces have been studied in the past decade. − So far, there has been no report to identify the effect of the functionalized NP–protein interaction and protein intermolecular interaction on the robust anisotropic self-assembly of magnetic nanospheres to form tens of microns anisotropic colloidal assembly (TMACA).…”

Section: Introductionmentioning

confidence: 99%

Path-Dependent Anisotropic Colloidal Assembly of Magnetic Nanocomposite–Protein Complexes

Pei

Wang

et al. 2022

Langmuir

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Anisotropic self-assembly of nanoparticles (NPs) stems from the fine-tuning of their surface functionality and NP interaction. Strategies involving ligand interaction, protein interaction, and external stimulus have been developed. However, robust construction of monodispersed magnetic NPs to tens of microns of anisotropically aligned colloidal assembly triggered by adsorbed protein intermolecular interaction is yet to be elucidated. Here, we present the NP–protein interaction, magnetic force, and protein corona intermolecular interaction serially but independently induced path-dependent self-assembly of 100 nm Fe3O4@SiO2 nanocomposites. Dynamic formation of the micron-sized anisotropic magnetic assembly was reproducibly realized in a continuous medium in a controllable manner. Formation of the primary globular clusters upon the unique NP–protein complexes with the help of ions acts as the prerequisite for the anisotropic colloidal assembly, followed by the magnetic force-driven pre-organization and protein intermolecular electrostatic interaction-mediated elongation. The protein concentration rather than the protein original structure plays a more pivotal role in the NP–protein interaction and subsequent colloidal assembly process. Two typical serum proteins fibrinogen and bovine serum albumin enable formation of the anisotropic colloidal assembly but with a different subtle morphology. Furthermore, the obtained micron-sized magnetic colloidal assembly can be dissociated rapidly by adding a negative electrolyte in the medium due to the interference in the NP–protein interaction. However, the self-assembly process can be recycled based on the dissociated colloidal assembly.

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Self-assembly of iron oxide nanoparticles into oriented nanosheets by one-pot template-free synthesis at low pH

Cited by 15 publications

References 15 publications

Dipole-directed assembly of Fe₃O₄nanoparticles into nanorings via oriented attachment

Dipole-directed assembly of Fe₃O₄nanoparticles into nanorings via oriented attachment

Microbial synthesis of Pd/Fe3O4, Au/Fe3O4 and PdAu/Fe3O4 nanocomposites for catalytic reduction of nitroaromatic compounds

Path-Dependent Anisotropic Colloidal Assembly of Magnetic Nanocomposite–Protein Complexes

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Self-assembly of iron oxide nanoparticles into oriented nanosheets by one-pot template-free synthesis at low pH

Cited by 15 publications

References 15 publications

Dipole-directed assembly of Fe3O4nanoparticles into nanorings via oriented attachment

Dipole-directed assembly of Fe3O4nanoparticles into nanorings via oriented attachment

Microbial synthesis of Pd/Fe3O4, Au/Fe3O4 and PdAu/Fe3O4 nanocomposites for catalytic reduction of nitroaromatic compounds

Path-Dependent Anisotropic Colloidal Assembly of Magnetic Nanocomposite–Protein Complexes

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Dipole-directed assembly of Fe₃O₄nanoparticles into nanorings via oriented attachment

Dipole-directed assembly of Fe₃O₄nanoparticles into nanorings via oriented attachment