Shape Control and Associated Magnetic Properties of Spinel Cobalt Ferrite Nanocrystals

Song, Qi; Zhang, Z. John

doi:10.1021/ja049931r

Cited by 783 publications

(518 citation statements)

References 22 publications

(22 reference statements)

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“…The blocking temperature and saturation magnetization of cobalt ferrites show the same volume dependencies for both spherical and cubic shapes. However, coercivity of cubes is considerably lower as compared to that of spheres, due to a larger external surface [54] .…”

Section: Effect Of Np Shapementioning

confidence: 97%

Application of alternative energy forms in catalytic reactor engineering

Houlding

Rebrov

2012

Green Processing and Synthesis

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This review provides a general overview of recent applications of magnetic nanoparticles for controlled radiofrequency (RF) heating in catalytic synthesis, mass transfer enhancement in laminar fl ow and magnetic separation. By directly delivering RF energy to magnetic materials, issues such as long heating periods and energy losses can be minimized. The main mechanisms of RF heating are briefl y reviewed. The effect of nanoparticles size, shape and composition on the effi ciency of RF heating is discussed. RF energy has been shown to be effective in many applications, however, it is still not used in chemicals due to high equipment costs.

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Section: Effect Of Np Shapementioning

confidence: 97%

Application of alternative energy forms in catalytic reactor engineering

Houlding

Rebrov

2012

Green Processing and Synthesis

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“…The particle size was determined by the amount of precursor; i.e., a higher concentration of acetylacetonates led to larger ferrite nanocrystals. Whereas Song et al started from spherical CoFe 2 O 4 seed particles 8 nm in diameter ( Figure 1a) and transformed them into cubelike nanocrystallites with an edge length of 10 nm (Figure 1b) by adjusting the heating rate, 25 Zeng et al systematically varied the surfactant-to-iron acetylacetonate ratio, which resulted in cubelike (Figure 1c (Figure 1e). 12 In the case of titania nanorods, the synthesis involved the solvothermal reaction of titanium butoxide, linoleic acid, triethylamine, and cyclohexane.…”

Section: Nonaqueous Sol-gel Routes To Metal Oxide Nanoparticlesmentioning

confidence: 99%

Nonaqueous Sol–Gel Routes to Metal Oxide Nanoparticles

2007

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Sol-gel routes to metal oxide nanoparticles in organic solvents under exclusion of water have become a versatile alternative to aqueous methods. In comparison to the complex aqueous chemistry, nonaqueous processes offer the possibility of better understanding and controlling the reaction pathways on a molecular level, enabling the synthesis of nanomaterials with high crystallinity and well-defined and uniform particle morphologies. The organic components strongly influence the composition, size, shape, and surface properties of the inorganic product, underlining the demand to understand the role of the organic species at all stages of these processes for the development of a rational synthesis strategy for inorganic nanomaterials.

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“…Given that the electrochemical properties of spinel-type transition metal oxides are highly sensitive to their material characteristics, a large number of low-temperature synthesis procedures have been developed for the fabrication of spinel-type transition metal oxides with controlled composition, crystal structures, surface morphologies, and porous structures. 50,[81][82][83][84][85][86][87][88] Although Section 3 provides details of the preparation of spinel-type transition metal oxides and their applications in specific ESSs, here, we highlight the most recent progress in the synthesis of spinel-type transition metal oxides with controlled phases and porous/morphological characteristics.…”

Section: General Aspects Of Spinel-type Transition Metal Oxidesmentioning

confidence: 99%

Porous nanoarchitectures of spinel-type transition metal oxides for electrochemical energy storage systems

Park

Kim

et al. 2015

Phys. Chem. Chem. Phys.

144

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. (2015). Porous nanoarchitectures of spinel-type transition metal oxides for electrochemical energy storage systems. Physical Chemistry Chemical Physics, 17 (46), 30963-30977. Porous nanoarchitectures of spinel-type transition metal oxides for electrochemical energy storage systems AbstractTransition metal oxides possessing two kinds of metals (denoted as AxB3-xO4, which is generally defined as a spinel structure; A, B = Co, Ni, Zn, Mn, Fe, etc.), with stoichiometric or even non-stoichiometric compositions, have recently attracted great interest in electrochemical energy storage systems (ESSs). The spinel-type transition metal oxides exhibit outstanding electrochemical activity and stability, and thus, they can play a key role in realising cost-effective and environmentally friendly ESSs. Moreover, porous nanoarchitectures can offer a large number of electrochemically active sites and, at the same time, facilitate transport of charge carriers (electrons and ions) during energy storage reactions. In the design of spinel-type transition metal oxides for energy storage applications, therefore, nanostructural engineering is one of the most essential approaches to achieving high electrochemical performance in ESSs. In this perspective, we introduce spinel-type transition metal oxides with various transition metals and present recent research advances in material design of spinel-type transition metal oxides with tunable architectures (shape, porosity, and size) and compositions on the micro-and nano-scale. Furthermore, their technological applications as electrode materials for next-generation ESSs, including metal-air batteries, lithium-ion batteries, and supercapacitors, are discussed. The spinel-type transition metal oxides exhibit outstanding electrochemical activity and stability, and thus, they can play a key role in realising cost-effective and environmentally friendly ESSs. Moreover, porous nanoarchitectures can offer a large number of electrochemically active sites and, at the same time, facilitate transport of charge carriers (electrons and ions) during energy storage reactions. In the design of spinel-type transition metal oxides for energy storage applications, therefore, nanostructural engineering is one of the most essential approaches to achieving high electrochemical performance in ESSs. In this perspective, we introduce spinel-type transition metal oxides with various transition metals and present recent research advances in material design of spinel-type transition metal oxides with tunable architectures (shape, porosity, and size) and compositions on the micro-and nano-scale.Furthermore, their technological applications as electrode materials for next-generation ESSs, including metal-air batteries, lithium-ion batteries, and supercapacitors, are discussed.

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Shape Control and Associated Magnetic Properties of Spinel Cobalt Ferrite Nanocrystals

Cited by 783 publications

References 22 publications

Application of alternative energy forms in catalytic reactor engineering

Application of alternative energy forms in catalytic reactor engineering

Nonaqueous Sol–Gel Routes to Metal Oxide Nanoparticles

Porous nanoarchitectures of spinel-type transition metal oxides for electrochemical energy storage systems

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