Periodic Mesoporous Organosilica Hollow Spheres with Tunable Wall Thickness

Djojoputro, H.; Zhou, Xinran; Qiao, Shi Zhang; Wang, Luyao; Yu, Chengzhong; Lu, Gao Qing

doi:10.1021/ja0607537

Cited by 270 publications

(207 citation statements)

References 17 publications

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“…Recently, Lu and co-workers reported a vesicle-liquid-crystal dual templating method for producing hollow spheres of periodic mesoporous organosilica (PMO) with tunable wall thickness. [201] Micelles or vesicles have also been utilized as soft templates to synthesize hollow spheres of other materials, such as carbon, [206] metal oxides, [207][208][209][210][211][212] as well as some metals. [213][214][215][216] Xu et al have recently prepared novel multishelled Cu 2 O hollow spheres with single-crystalline shell structure via a simple CTAB vesicle templating route in aqueous solution (see Fig.…”

Section: Reviewmentioning

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: Reviewmentioning

confidence: 99%

Hollow Micro‐/Nanostructures: Synthesis and Applications

2008

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“…[1][2][3][4][5] A typical and important class of organosilica nanostructures is hollow nanospheres. 5 Compared with silica hollow nanospheres, organosilica hollow nanospheres (OHNs) combine the advantages of organic domains and inorganic building blocks and they are more easily modified through chemical transformation of the organic groups in the hybrid framework. The fabrication of organosilicas in nanospherical morphology has attracted much research attention because of their potential applications in catalysis, drug delivery, and protection materials for biomolecules.…”

Section: Introductionmentioning

confidence: 99%

Tunable Assembly of Organosilica Hollow Nanospheres

et al. 2009

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Hollow nanospheres with a particle size of less than 25 nm have been successfully fabricated using an ethylene-, phenylene-, and 1,4-diethylphenylene-bridging silane precursor with F127 as a soft template under an acidic medium. As the size and flexibility of the bridging organic group increases, it is more and more difficult for the formation of hollow nanospheres. The organic additive, 1,3,5-trimethylbenzene, could finely tune the particle size of the nanosphere from 12 to 25 nm. It was found that silane precursors with hydrophobicity and slow hydrolysis rate favor the formation of hollow nanospheres and hydrophilic silane precursors such as tetramethoxysilane induce the formation of mesostructured bulk materials. Under the current synthesis conditions, carefully tuning the interaction between templates and silica species, organosilica hollow nanospheres with controlled composition can be successfully obtained.

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“…Especially, papers dealing with surfactant-templated synthesis of vesicle-like hollow silica particles have increased dramatically because of the distinguished advantages of these materials, such as low density, high surface area and surface permeability, and potential applications in encapsulation, controlled release of drugs, catalysis, separation, and so forth. [13][14][15][16][17][18][19] Lipid vesicles play very important roles in the studies of models for biomembranes and vehicles for drug and gene delivery. [20,21] There were few works reporting the creation of hollow silica particles by using lipid vesicles as templates.…”

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confidence: 99%

The Effect of Template Phase on the Structures of As‐Synthesized Silica Nanoparticles with Fragile Didodecyldimethylammonium Bromide Vesicles as Templates

Zhang

Liu

et al. 2007

Advanced Materials

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In recent years, the synthesis of organized inorganic materials has attracted enormous attention in the chemistry and material communities due to their potential applications and great benefits in understanding biomineralization processes. [1][2][3][4][5] Template synthesis is an effective means to construct organized inorganic materials. A series of templates, including lyotropic liquid crystals, [6][7][8][9] block copolymers, [10] microemulsions, [11] and polymer latex particles [12] have been chosen to prepare organized inorganic materials with different components and morphologies. Especially, papers dealing with surfactant-templated synthesis of vesicle-like hollow silica particles have increased dramatically because of the distinguished advantages of these materials, such as low density, high surface area and surface permeability, and potential applications in encapsulation, controlled release of drugs, catalysis, separation, and so forth. [13][14][15][16][17][18][19] Lipid vesicles play very important roles in the studies of models for biomembranes and vehicles for drug and gene delivery. [20,21] There were few works reporting the creation of hollow silica particles by using lipid vesicles as templates. For instance, German et al. synthesized hollow silica nanoparticles by using unilamellar dimethyldioctadecylammonium bromide (DODAB) vesicles as the templates.[14] The understanding of silica nanoparticles formation that occurs in lipid vesicle solutions is of quite general importance for the template synthesis of organized inorganic materials and comprehension of biomineralization processes. In addition, phase transition is one of important properties for lipids; [22] therefore, it is interesting to investigate the effect of template phase on the synthesis of organized inorganic materials. However, to the best of our knowledge, few works concerned the effect of the lipid phase on the structures of the products. [23] In this communication, diverse silica nanoparticles were synthesized with tetraethylorthosilicate (TEOS) as the silica source by the direction of fragile didodecyldimethylammonium bromide (DDAB) vesicles. More interestingly, it was found that the phase of DDAB vesicles greatly influenced the structures of the as-synthesized silica nanoparticles. The DDAB vesicles in aqueous dispersions exhibit a gel to liquid-crystalline phase transition at temperature of 16°C, [24] i.e., the main phase transition temperature (T m ) of DDAB vesicles is 16°C. The experimental results indicate that the template phase is a crucial factor for the structure of the resulting silica nanoparticles. When the reaction temperature (at around 20°C) was higher than T m of DDAB vesicles in aqueous solution, the majority of the silica nanoparticles were solid spheres, meanwhile some hollow spheres existed. However, when the reaction temperature (at around 8°C) was lower than T m , the prepared silica nanoparticles were mostly hollow spheres. Moreover, the performed experiments confirm that the typical silica nanoparticles are...

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Periodic Mesoporous Organosilica Hollow Spheres with Tunable Wall Thickness

Cited by 270 publications

References 17 publications

Hollow Micro‐/Nanostructures: Synthesis and Applications

Hollow Micro‐/Nanostructures: Synthesis and Applications

Tunable Assembly of Organosilica Hollow Nanospheres

The Effect of Template Phase on the Structures of As‐Synthesized Silica Nanoparticles with Fragile Didodecyldimethylammonium Bromide Vesicles as Templates

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