Cobalt oxide hollow nanoparticles derived by bio-templating

Kim, Jae-Woo; Choi, Sang H.; Lillehei, Peter T.; Chu, Sang-Hyon; King, Glen C.; Watt, Gerald D.

doi:10.1039/b505097a

Cited by 89 publications

(68 citation statements)

References 51 publications

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“…[93] While silica and latex particles are the most commonly used templates in hard templating synthesis, numerous other particles have also been explored, including noble metals, [94,95] quantum dots, [96] CaCO 3 , [97,98] and biomolecules. [99,100] Additionally, many novel templating methods based on other shellforming strategies have been reported for preparing hollow spheres of different materials. In particular, preparation of hollow particles by sonochemical deposition has been demonstrated in several works.…”

Section: Other Strategies and Templatesmentioning

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: Other Strategies and Templatesmentioning

confidence: 99%

Hollow Micro‐/Nanostructures: Synthesis and Applications

2008

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“…A synthesis of ferrimagnetic ferritin (γ-Fe 2 O 3 ) was achieved by a chemical remineralization procedure [7,8] with the assistance of H 2 O 2 oxidant in 3-[(1,1-dimethyl-2-hydroxyethyl)amino]-2-hydroxypropanesulfonic acid(AMPSO) buffer (pH 8.5) at 65 o C under N 2 gas. Biomineralization of other metals (i.e., Co [9,11], Mn [12][13][14], Ni [15], and Pd [16]), semiconductors (CdS) [17], and metal-oxo-anions composites [18] into the ferritin cavity has also been reported. Wong et al demonstrated the magnetic transition from superparamagnetic to ferromagnetic CoPt cored ferritin [19][20].…”

Section: Introductionmentioning

confidence: 99%

Electrochemically controlled reconstitution of immobilized ferritins for bioelectronic applications

Kim

Choi

Lillehei

et al. 2007

Journal of Electroanalytical Chemistry

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“…have been widely employed as templates to fabricate structural functional inorganic materials. The nano-particles, 12,13 two-dimensional arrays of nanoparticles, 14,15 nanowires, 16,17 nanotubes, 18 nanospheres 19 and other nanostructured complex architectures 20 have been achieved by the facile biotemplate approach. Particularly, some macroscopical bio-templates with micro-/nanoscale structures, such as insect wings, plant leaves, 4,21 and silk fibers, 2,22 have also been used as templates to fabricate functional inorganic materials with novel architectures, which may find potential applications to catalysis, magnetism, separation, gas sensors, electrical and optical devices and so on.…”

Section: Introductionmentioning

confidence: 99%

Morphology‐controlled Synthesis of SiO₂ Hierarchical Structures Using Pollen Grains as Templates

Guan¹,

Zhang²,

Lu³

et al. 2008

Chin. J. Chem.

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Rape-, sweet potato-and camellia-pollen-templated SiO 2 hierarchical structures with species-specific surface morphologies were prepared through a facile surface sol-gel and succedent calcination process. Various-morphology SiO 2 replicas with complex structures, such as about 50-µm-length and 20-µm-width high-fidelity ellipsoidal replicas with about 5-µm uniform meshes, about 40-µm spheres with 2-µm taper-like protuberances and 15-µm spheres with troughs, were obtained from using rape-, sweet potato-and camellia pollen grains as templates, respectively. The results of N 2 adsorption-desorption isotherms indicate that both rape-and camellia-pollentemplated SiO 2 replicas show type IV-like isotherm with the characteristics of mesoporosity and corresponding Brunauer-Emmett-Teller (BET) surface areas are 10.5 and 5.2 m 2 •g -1 , respectively. The Barrett-Joyner-Halenda (BJH) pore size distribution of the rape-pollen-templated SiO 2 replicas presents smaller pores centered at 3.6 nm and bigger pores centered at 8.6 nm with a broad distribution whereas the camelliapollen-templated SiO 2 replicas display narrow BJH pore size distribution centered at 20 nm. The biofabrication procedure using ubiquitous, inexpensive and environment-friendly pollen grains as a biotemplate holds a promise as a simple route to construct controlled complex porous oxides via simple chemical methods.

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Cobalt oxide hollow nanoparticles derived by bio-templating

Abstract: We present here the first fabrication of hollow cobalt oxide nanoparticles produced by a protein-regulated site-specific reconstitution process in aqueous solution and describe the metal growth mechanism in the ferritin interior.

Cited by 89 publications

References 51 publications

Hollow Micro‐/Nanostructures: Synthesis and Applications

Hollow Micro‐/Nanostructures: Synthesis and Applications

Electrochemically controlled reconstitution of immobilized ferritins for bioelectronic applications

Morphology‐controlled Synthesis of SiO₂ Hierarchical Structures Using Pollen Grains as Templates

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Cobalt oxide hollow nanoparticles derived by bio-templating

Abstract: We present here the first fabrication of hollow cobalt oxide nanoparticles produced by a protein-regulated site-specific reconstitution process in aqueous solution and describe the metal growth mechanism in the ferritin interior.

Cited by 89 publications

References 51 publications

Hollow Micro‐/Nanostructures: Synthesis and Applications

Hollow Micro‐/Nanostructures: Synthesis and Applications

Electrochemically controlled reconstitution of immobilized ferritins for bioelectronic applications

Morphology‐controlled Synthesis of SiO2 Hierarchical Structures Using Pollen Grains as Templates

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Morphology‐controlled Synthesis of SiO₂ Hierarchical Structures Using Pollen Grains as Templates