One-Pot Template-Free Synthesis of Monodisperse and Single-Crystal Magnetite Hollow Spheres by a Simple Solvothermal Route

Zhu, Luping; Xiao, Hong‐Mei; Zhang, Weidong; Guo, Yang; Fu, Shao‐Yun

doi:10.1021/cg700861a

Cited by 232 publications

(118 citation statements)

References 78 publications

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“…Based on an illustrative drawing, it was argued that for solid spheres composed of numerous small particles, the small particles in the inner cores have high surface energies compared to those in the outer surfaces, because they can also be visualized as smaller spheres having a higher curvature. Although fundamental evidence in support of this mechanism is lacking, it has been shown to be applicable in many systems, including TiO 2 , [275][276][277] Cu 2 O, [278,279] ZnS and Co 3 O 4 , [280] Sb 2 S 3 , [281] Ti 1-x Sn x O 2 , [282] Fe 3 O 4 , [283] and ZnO. [284] Interestingly, in the synthesis of Cu 2 O hollow structures, [278,279] TiO 2 hollow spheres, however the product also contains significant fraction of fluorine.…”

Section: à3mentioning

confidence: 99%

Hollow Micro‐/Nanostructures: Synthesis and Applications

2008

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Hollow micro‐/nanostructures are of great interest in many current and emerging areas of technology. Perhaps the best‐known example of the former is the use of fly‐ash hollow particles generated from coal power plants as partial replacement for Portland cement, to produce concrete with enhanced strength and durability. This review is devoted to the progress made in the last decade in synthesis and applications of hollow micro‐/nanostructures. We present a comprehensive overview of synthetic strategies for hollow structures. These strategies are broadly categorized into four themes, which include well‐established approaches, such as conventional hard‐templating and soft‐templating methods, as well as newly emerging methods based on sacrificial templating and template‐free synthesis. Success in each has inspired multiple variations that continue to drive the rapid evolution of the field. The Review therefore focuses on the fundamentals of each process, pointing out advantages and disadvantages where appropriate. Strategies for generating more complex hollow structures, such as rattle‐type and nonspherical hollow structures, are also discussed. Applications of hollow structures in lithium batteries, catalysis and sensing, and biomedical applications are reviewed.

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Section: à3mentioning

confidence: 99%

Hollow Micro‐/Nanostructures: Synthesis and Applications

2008

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“…Several new sonochemical and solvothermal techniques have been reported to simplify the preparation of hollow structures. [8][9][10] However, nanosized phase-metastable materials are still difficult to obtain via these techniques. Multiferroic materials are compounds which exhibit (anti-)ferromagnetism (AFM/FM) and ferroelectricity (FE) simultaneously.…”

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confidence: 99%

Fabrication, magnetic, and ferroelectric properties of multiferroic BiFeO3 hollow nanoparticles

Cheng

Dou

et al. 2011

Journal of Applied Physics

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Hollow BiFeO 3 nanoparticles were synthesized by an electrospray route for the first time. The phase purity and structure have been investigated by x-ray diffraction and Raman spectroscopy. Transmission and scanning electron microscope investigations revealed that the as-obtained BiFeO 3 hollow spheres were polycrystalline, with a shell thickness of 35 nm. The formation mechanism can be possibly explained by Ostwald ripening. Raman spectra have verified decreased vibrational frequencies in BiFeO 3 nanoparticles. These hollow and core-shell multiferroicnanoparticles exhibit significantly enhanced ferromagnetism from 5 to 600 K due to a broken spiral spin structure. The ferroelectricity of hollow BiFeO 3 particles exhibits a lower switching electric field, which is confirmed by Kelvin probe force microscopy. Hollow BiFeO 3 nanoparticles were synthesized by an electrospray route for the first time. The phase purity and structure have been investigated by x-ray diffraction and Raman spectroscopy. Transmission and scanning electron microscope investigations revealed that the as-obtained BiFeO 3 hollow spheres were polycrystalline, with a shell thickness of 35 nm. The formation mechanism can be possibly explained by Ostwald ripening. Raman spectra have verified decreased vibrational frequencies in BiFeO 3 nanoparticles. These hollow and core-shell multiferroic nanoparticles exhibit significantly enhanced ferromagnetism from 5 to 600 K due to a broken spiral spin structure. The ferroelectricity of hollow BiFeO 3 particles exhibits a lower switching electric field, which is confirmed by Kelvin probe force microscopy.

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“…Recently, one template-free method to prepare Fe 3 O 4 hollow nanoparticles has been developed based on the inside-out Ostwald ripening Hu et al, 2009;Lin et al, 2012;Zhu et al, 2008). The plausible mechanism was supported by several experimental observations, considering the chemical conversion as an important factor for the hollowing process .…”

Section: +mentioning

confidence: 97%

Controlled Magnetic Properties of Iron Oxide-Based Nanoparticles for Smart Therapy

Kim

2016

KONA

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Magnetic nanoparticles provide a unique nanosystem for various smart therapy applications because of their biocompatibility, their nanostructures which can be prepared controllably to match with the interest of study and, specifically, their responses to an external magnetic field. Interests in utilizing magnetic nanoparticles for biomedical treatments originate from their external controllability of transportation and movement inside biological objects and magnetic heat generation which provide tremendous advantages for targeted drug delivery and controlled drug release as well as magnetic hyperthermia. Recent progress in synthesis and functionalization has led to the formation of various functional magnetic nanoparticles with controlled magnetic properties based on controlling their particle size, shape and composition. In this review, we focus on the synthesis, protection and functionalization of iron oxide-based magnetic nanoparticles in order to control magnetic properties of nanostructured systems. We also highlight the recent advances in the development of multifunctional therapeutic nanosystems combining magnetic nanoparticles and drugs as well as their superior efficacy in biomedical treatments with smart performance by including therapy and modulated drug delivery and release through magnetic heating.

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One-Pot Template-Free Synthesis of Monodisperse and Single-Crystal Magnetite Hollow Spheres by a Simple Solvothermal Route

Cited by 232 publications

References 78 publications

Hollow Micro‐/Nanostructures: Synthesis and Applications

Hollow Micro‐/Nanostructures: Synthesis and Applications

Fabrication, magnetic, and ferroelectric properties of multiferroic BiFeO3 hollow nanoparticles

Controlled Magnetic Properties of Iron Oxide-Based Nanoparticles for Smart Therapy

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