Preparation and magnetic properties of hollow nano-spheres of cobalt and cobalt oxide: Drastic cooling-field effects on remnant magnetization of antiferromagnet

Yoshikawa, Hideki; Hayashida, Kenta; Kozuka, Yasuharu; Horiguchi, Asami; Awaga, Kunio; Bandow, Shunji; Iijima, Sumio

doi:10.1063/1.1827329

Cited by 82 publications

(67 citation statements)

References 26 publications

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“…4 ) is formed due to the strong interactions between silica and nickel species. [50,51] After silica removal and reduction with H 2 at 450-500 8C, metallic Ni [50] or Ni-silica [51] [52,53] More recently, Xu and co-workers have reported synthesis of uniform hollow nanospheres of NiO, a-Fe 2 O 3 , ZnO, CuO and Ga 2 O 3 using carbonaceous polysaccharide nanospheres as hard templates by controlled precipitation followed by calcination. [54] The key to this controlled precipitation route appears to involve preferred heterogeneous precipitation on the template surface induced by slow release of hydroxyl anions from thermal decomposition of urea.…”

Section: Direct Chemical Depositionmentioning

confidence: 98%

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: Direct Chemical Depositionmentioning

confidence: 98%

Hollow Micro‐/Nanostructures: Synthesis and Applications

2008

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“…[9] In another example, Halas and co-workers have demonstrated that gold nanoshells greatly expand the spectral range of surface-plasmon-resonance (SPR) features. [10] Hollow metal nanostructures are often prepared by templating using existing entities such as silica beads, [11] polymer beads, [12] micelles [13] or by seed-mediated methods. [14] Recently, transmetallation reactions between hydrophobic silver nanoparticles and hydrophobic chloroaurate and chloroplatinate ions in chloroform were reported to result in the formation of hollow gold and platinum shell nanoparticles, respectively.…”

Section: Introductionmentioning

confidence: 99%

Uniform Magnetic Chains of Hollow Cobalt Mesospheres from One‐Pot Synthesis and Their Assembly in Solution

Guo

Fang

Wen

et al. 2007

Adv Funct Materials

192

145

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Magnetic chains up to 10 μm in length formed of hollow cobalt mesospheres (480–850 nm) with a 60 nm thick shell are synthesized by a new soft‐assembly protocol. The obtained chains show a saturation magnetization of 37.5 emu g–1, a remnant magnetization of 1.55 emu g–1, and a coercivity of ca. 66 Oe at 300 K. A possible mechanism for the formation of the chainlike hollow structures is proposed.

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“…The recent progress in fine processing technologies has enabled the fabrication of nanoscale materials with novel shapes [1,2,3,4,5,6,7,8,9]. A study of the basic properties of these materials is crucially important for many potential applications; it also helps to gain a new perspective on nanodevice modeling.…”

Section: Introductionmentioning

confidence: 99%

Novel scaling behavior of the Ising model on curved surfaces

2007

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We demonstrate the nontrivial scaling behavior of Ising models defined on (i) a donut-shaped surface and (ii) a curved surface with a constant negative curvature. By performing Monte Carlo simulations, we find that the former model has two distinct critical temperatures at which both the specific heat C(T ) and magnetic susceptibility χ(T ) show sharp peaks. The critical exponents associated with the two critical temperatures are evaluated by the finite-size scaling analysis; the result reveals that the values of these exponents vary depending on the temperature range under consideration. In the case of the latter model, it is found that static and dynamic critical exponents deviate from those of the Ising model on a flat plane; this is a direct consequence of the constant negative curvature of the underlying surface.

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Preparation and magnetic properties of hollow nano-spheres of cobalt and cobalt oxide: Drastic cooling-field effects on remnant magnetization of antiferromagnet

Cited by 82 publications

References 26 publications

Hollow Micro‐/Nanostructures: Synthesis and Applications

Hollow Micro‐/Nanostructures: Synthesis and Applications

Uniform Magnetic Chains of Hollow Cobalt Mesospheres from One‐Pot Synthesis and Their Assembly in Solution

Novel scaling behavior of the Ising model on curved surfaces

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