Capping Groups Induced Size and Shape Evolution of Magnetite Particles Under Hydrothermal Condition and their Magnetic Properties

Song, Li; Qin, Tipeng; Pei, Wenli; Ren, Yuping; Zhang, Yudong; Esling, Claude; Zuo, Liang

doi:10.1111/j.1551-2916.2009.02928.x

Cited by 22 publications

(14 citation statements)

References 27 publications

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“…Common polymers include polyethyleneimine (PEI), poly(ethylene glycol) (PEG), poly(vinylpyrrolidone) (PVP), poly(acrylic acid) (PAA) and poly(vinyl alcohol) (PVA) [23,55,57]. Small molecules containing halides, small polymers and solvents are also used for coordination of specific crystal planes [55,58]. Here, the functional groups have to be considered as they affect the size, shape and magnetic properties of the crystals [23,58].…”

Section: Synthesis Of Shape Anisotropic Nanoparticlesmentioning

confidence: 99%

Shape Anisotropic Iron Oxide-Based Magnetic Nanoparticles: Synthesis and Biomedical Applications

Andrade

Veloso

Castanheira

2020

IJMS

129

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Research on iron oxide-based magnetic nanoparticles and their clinical use has been, so far, mainly focused on the spherical shape. However, efforts have been made to develop synthetic routes that produce different anisotropic shapes not only in magnetite nanoparticles, but also in other ferrites, as their magnetic behavior and biological activity can be improved by controlling the shape. Ferrite nanoparticles show several properties that arise from finite-size and surface effects, like high magnetization and superparamagnetism, which make them interesting for use in nanomedicine. Herein, we show recent developments on the synthesis of anisotropic ferrite nanoparticles and the importance of shape-dependent properties for biomedical applications, such as magnetic drug delivery, magnetic hyperthermia and magnetic resonance imaging. A brief discussion on toxicity of iron oxide nanoparticles is also included.

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Section: Synthesis Of Shape Anisotropic Nanoparticlesmentioning

confidence: 99%

Shape Anisotropic Iron Oxide-Based Magnetic Nanoparticles: Synthesis and Biomedical Applications

Andrade

Veloso

Castanheira

2020

IJMS

129

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“…The ZnFe x Co 2− x O 4 series solid‐solutions were prepared by a sol–gel method and subsequent heat treatment at 600 °C. The X‐ray diffraction (XRD) patterns of the as‐synthesized ZnFe x Co 2− x O 4 in Figure a show that all of the samples have a typical spinel structure . With more Co 3+ ions replaced by the Fe 3+ (varying x from 0 to 2), all diffraction peaks gradually shift to lower angles, implying slightly larger ionic radius of Fe 3+ compared to Co 3+ in the spinel lattice.…”

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confidence: 99%

Control of Catalytic Activity of Nano‐Au through Tailoring the Fermi Level of Support

Liu

Chen

et al. 2019

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Nanoparticles of noble metals dispersed on solid support have been extensively utilized for catalyzing chemical reactions for energy conversion, environmental remediation, and chemical industry for their remarkable catalytic performance. [1][2][3][4] To maneuver the catalytic performance of these materials, tremendous efforts have been focused on the control of metal nanoparticles, including size and shape, [5][6][7] composition, [8] and chemical ordering. [9] At the meantime, the influence of the support on catalytic properties maximizing the number of active sites accessible for reaction have been well recognized. For example, the size distribution [10] and structural stability [11] of metal nanoparticles could be adjusted via the selection of the support. Furthermore, encapsulation of the metals by support species under high temperature treatment are widely observed, which finally results in the establishment of the classical strong metal-support interaction (SMSI). [12] However, the physicochemical interaction between metal and support cannotThe catalytic properties of nanometals are strongly dependent on their electronic states which, are influenced by the interaction with the supports. However, a precise manipulation of the electronic interaction is lacking, and the nature of the interaction is still ambiguous. Herein, using Au/ZnFe x Co 2−x O 4 (x = 0-2) as a model system with continuously tuned Fermi levels of supports, the electronic structure of the Au catalyst can be precisely controlled by changing the Fermi level of the support, which arises from the charge redistribution between the two phases. A higher Fermi level of ZnFe 2 O 4 support makes nano-Au negatively charged and thus facilitates the oxidation of CO, and in contrast, a lower Fermi level of ZnCo 2 O 4 support makes nano-Au positively charged and is preferential to the oxidation of benzyl alcohol. This work represents a solid step towards exploration of advanced catalysts with deliberate design of electronic structure and catalytic properties.

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“…After testing the SiO 2 creep, the feasibility of exploiting SiO 2 creep for nanostructuring was studied in a SiO 2 –Fe 3 O 4 nanocomposite. First, Fe 3 O 4 core particles were prepared by hydrothermal synthesis from FeCl 3 ·6H 2 O (Wako Pure Chemical Industries, Japan) and FeCl 2 ·4H 2 O (Wako Pure Chemical Industries) . Here, FeCl 3 ·6H 2 O (1.39 g) and FeCl 2 ·4H 2 O (0.57 g) were dissolved in 5 mL of water mixed with 5 g of ethylene glycol to obtain a precursor.…”

Section: Methodsmentioning

confidence: 99%

“…First, Fe 3 O 4 core particles were prepared by hydrothermal synthesis from FeCl 3 Á6H 2 O (Wako Pure Chemical Industries, Japan) and FeCl 2 Á4H 2 O (Wako Pure Chemical Industries). 13 Here, FeCl 3 Á6H 2 O (1.39 g) and FeCl 2 Á4H 2 O (0.57 g) were dissolved in 5 mL of water mixed with 5 g of ethylene glycol to obtain a precursor. Adding aqueous NaOH (5.0 g in 8 mL water) to the precursor led to precipitation of the reactants.…”

Section: Methodsmentioning

confidence: 99%

Nanocomposite Derived from Core–Shell Nanoparticles via Creep Deformation of an Amorphous Silica Layer Below its Glass Transition Temperature

2013

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The microstructural design of ceramics is relevant to tune their properties. Nanostructuring can drastically modify ceramic properties because of enhanced interfacial effects, although the creation of such structures in ceramics is still challenging because of the interfacial reaction and grain growth at elevated temperatures during sintering. Here, we demonstrate densification of core-shell nanoparticles consisting of Fe 3 O 4 (core particle, 20 nm diameter) and SiO 2 (shell layer, 2 nm thick) with over 90% of theoretical density below 500°C, which was achieved by facilitating plastic flow of amorphous SiO 2 under high pressure below its glass transition temperature. Thus, grain growth of the core nanoparticles was strongly suppressed, and the core nanoparticles remained separated by an amorphous layer in the final microstructure reflecting the original core-shell nanostructure. We also analyzed the densification behavior on the basis of a power law creep model, and estimated the pressures required to attain full density.

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Capping Groups Induced Size and Shape Evolution of Magnetite Particles Under Hydrothermal Condition and their Magnetic Properties

Cited by 22 publications

References 27 publications

Shape Anisotropic Iron Oxide-Based Magnetic Nanoparticles: Synthesis and Biomedical Applications

Shape Anisotropic Iron Oxide-Based Magnetic Nanoparticles: Synthesis and Biomedical Applications

Control of Catalytic Activity of Nano‐Au through Tailoring the Fermi Level of Support

Nanocomposite Derived from Core–Shell Nanoparticles via Creep Deformation of an Amorphous Silica Layer Below its Glass Transition Temperature

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