Scalable Synthesis of Chestnut‐ Bur‐like Magnetic Capsules Loaded with Size‐Controlled Mono‐ or Bimetallic Cores

Choi, Won San; Koo, Hye Young; Kim, Dong‐Yu

doi:10.1002/adma.200601508

Cited by 40 publications

(39 citation statements)

References 33 publications

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“…Based on a conceptually similar approach, Choi et al have recently reported a versatile method to prepare a-Fe 2 O 3 (or silica, or a-Fe 2 O 3 /silica) capsules loaded with size-controlled monometallic (Au, Pt, Ag) or bimetallic (AuPt) cores. [314] The method involves several steps. First, metal nanoparticles are consecutively synthesized within the polyelectrolyte multilayers (PEMs) coated on melamine-formaldehyde (MF) templates by LBL technique (see Sec.…”

Section: Bottom-up Fabrication Of Nanorattlesmentioning

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: Bottom-up Fabrication Of Nanorattlesmentioning

confidence: 99%

Hollow Micro‐/Nanostructures: Synthesis and Applications

2008

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“…[44] Choi and co-workers have fabricated AuPt hybrid particles enclosed in a hematite hollow shell. [100] Still various rattle-structured hollow spheres have been prepared including homogeneous SiO 2 @SiO 2 , [108] or heterogeneous Pt@C, [109] Au@SiO 2 , [94,102,110] and a good number of others. These rattle-structured spheres mostly show a spherical morphology since they start from spherical templates.…”

Section: Core-in-hollow-shell Spheresmentioning

confidence: 99%

Hollow Micro/Nanomaterials with Multilevel Interior Structures

2009

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In this Review, recent achievements in the multilevel interior‐structured hollow 0D and 1D micro/nanomaterials are presented and categorized. The 0D multilevel interior‐structured micro/nanomaterials are classified into four main interior structural categories that include a macroporous structure, a core‐in‐hollow‐shell structure, a multishell structure, and a multichamber structure. Correspondingly, 1D tubular micro/nanomaterials are of four analogous structures, which are a segmented structure, a wire‐in‐tube structure, a multiwalled structure, and a multichannel structure. Because of the small sizes and complex interior structures, some special synthetic strategies that are different from routine hollowing methods, are proposed to produce these interior structures. Compared with the same‐sized solid or common hollow counterparts, these fantastic multilevel hollow‐structured micro/nanomaterials show a good wealth of outstanding properties that enable them broad applications in catalysis, sensors, Li‐ion batteries, microreactors, biomedicines, and many others.

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“…[13][14][15] The recent upsurge in reports of novel template-free or self-templated routes for the preparation of hollow particles [7][8][9][10] simultaneously underscores their importance and highlights the range of approaches that can be used for their synthesis. Notwithstanding these advances, templating against colloidal particles remains arguably the most effective, and certainly the most general, method for the preparation of hollow particles with a narrow size distribution and well-defined shape.…”

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confidence: 99%

“…In many cases incompatibility between the substrate and coating material requires prior surface modification/ functionalization before the coating step can be performed. [16,23] Numerous approaches, including sol-gel coating, [17,19b] surface adsorption, [14,16,20] chemical vapor deposition, [24] atomic layer deposition, [25] and layer-by-layer adsorption utilizing electrostatic interactions, [1,4,23] have been employed to uniformly coat templates. Among these approaches, sol-gel coating is commonly used for preparation of hollow oxide particles.…”

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confidence: 99%