A vesicle-aggregation-assembly approach to highly ordered mesoporous γ-alumina microspheres with shifted double-diamond networks

Liu, Yang; Teng, Wei; Chen, Gang; Zhao, Zaiwang; Zhang, Wei; Kong, Biao; Hozzein, Wael N.; Al-Khalaf, Areej A.; Deng, Yonghui; Zhao, Dongyuan

doi:10.1039/c8sc02967a

Cited by 23 publications

(28 citation statements)

References 58 publications

(34 reference statements)

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“…[ 25–27 ] For these materials, the syntheses were difficult to avoid the co‐assembly of the micelle–oligomer building units into macroscopic structures due to the thermodynamic instability of linear polymeric micelles. [ 25,28–35 ] To date, no example of monodispersed, ultrasmall hybrid nanoparticles with switchable components and controllable structural parameters has been reported yet by linear block copolymer micelles. Therefore, stabilizing these polymeric micelles for creating ultrasmall monodispersed hybrid nanoparticles still remains a great challenge.…”

Section: Introductionmentioning

confidence: 99%

General Synthesis of Ultrafine Monodispersed Hybrid Nanoparticles from Highly Stable Monomicelles

et al. 2021

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Ultrafine nanoparticles with organic–inorganic hybridization have essential roles in myriad applications. Over the past three decades, although various efforts on the formation of organic or inorganic ultrasmall nanoparticles have been made, ultrafine organic–inorganic hybrid nanoparticles have scarcely been achieved. Herein, a family of ultrasmall hybrid nanoparticles with a monodisperse, uniform size is synthesized by a facile thermo‐kinetics‐mediated copolymer monomicelle approach. These thermo‐kinetics‐mediated monomicelles with amphiphilic ABC triblock copolymers are structurally robust due to their solidified polystyrene core, endowing them with ultrahigh thermodynamic stability, which is difficult to achieve using Pluronic surfactant‐based micelles (e.g., F127). This great stability combined with a core–shell–corona structure makes the monodispersed monomicelles a robust template for the precise synthesis of ultrasmall hybrid nanoparticles with a highly uniform size. As a demonstration, the obtained micelles/SiO2 hybrid nanoparticles display ultrafine sizes, excellent uniformity, monodispersity, and tunable structural parameters (diameters: 24–47 nm and thin shell thickness: 2.0–4.0 nm). Notably, this approach is universal for creating a variety of multifunctional ultrasmall hybrid nanostructures, involving organic/organic micelle/polymers (polydopamine) nanoparticles, organic/inorganic micelle/metal oxides (ZnO, TiO2, Fe2O3), micelle/hydroxides (Co(OH)2), micelle/noble metals (Ag), and micelle/TiO2/SiO2 hybrid composites. As a proof of concept, the ultrasmall micelle/SiO2 hybrid nanoparticles demonstrate superior toughness as biomimetic materials.

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Section: Introductionmentioning

confidence: 99%

General Synthesis of Ultrafine Monodispersed Hybrid Nanoparticles from Highly Stable Monomicelles

et al. 2021

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“…The DD-CN solid has a pore diameter of 14 nm, on average, a high SSA of 131 m 2 g –1 with a pore volume up to 0.63 cm 3 g –1 , and an optical band gap of 2.8 eV. To our knowledge, DD-structured materials have so far been very rarely documented, with successful cases exclusively for SiO 2 , TiO 2 , , and Al 2 O 3 . Our study broadens the spectrum of DD-structured materials, as DD-CN may represent a bicontinuous organic semiconductor photocatalyst.…”

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confidence: 74%

“…To our knowledge, DDstructured materials have so far been very rarely documented, with successful cases exclusively for SiO 2 , 8 TiO 2 , 9,18 and Al 2 O 3 . 19 Our study broadens the spectrum of DD-structured materials, as DD-CN may represent a bicontinuous organic semiconductor photocatalyst. Polymeric g-CNs are of great interest in the application of photocatalytic water splitting owing to their high bulk moduli, low density, excellent chemical and thermal stability, and particularly visible-light-driven photocatalytic capability.…”

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confidence: 83%

Ordered Bicontinuous Mesoporous Polymeric Semiconductor Photocatalyst

Chen

et al. 2020

ACS Nano

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Owning triply periodic minimal surfaces and three-dimensional (3D) interconnected pores, bicontinuous porous materials have drawn enormous attention due to their great academic interest and potential applications in many fields including energy and catalysis. However, their synthesis has remained a great challenge. Here, we demonstrate the synthesis of a bicontinuous porous organic semiconductor photocatalyst, which involves the preparation of SiO 2 with a shifted double diamond (DD) structure through solvent evaporation-induced self-assembly of a polystyrene-block-poly(ethylene oxide) diblock copolymer and tetraethyl orthosilicate, followed by SiO 2templated self-condensation of melamine monomers in a vacuum. Strikingly, the resultant DD-structured graphitic carbon nitride (g-CN) possesses two sets of 3D continuous mesopores with a mean diameter of 14 nm, which afford a high specific surface area of 131 m 2 g −1 and an optical band gap of 2.8 eV. Being a visible-light-driven photocatalyst, the bicontinuous mesoporous g-CN exhibits high catalytic activity for water splitting to generate H 2 (6831 μmol g −1 h −1 ) with excellent cycling stability. This study provides a protocol for the construction of ordered mesoporous materials containing 3D continuous channels, which holds promise for catalysis applications.

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“…The reduction of 4‐NP is an efficient removal route, and the reduction product 4‐aminophenol (4‐AP) is not only less toxic than 4‐NP but also a primarily useful chemical raw material. Hence, the conversion of 4‐NP into 4‐AP with NaBH 4 is widely used as a model reaction for evaluating the catalytic reduction activity of catalysts . The initial pale yellow aqueous solution of 4‐NP itself presents a strong UV absorption at ≈317 nm ( Figure a).…”

Section: Resultsmentioning

confidence: 99%

Fabrication of 3D Hierarchical Byttneria Aspera‐Like Ni@Graphitic Carbon Yolk–Shell Microspheres as Bifunctional Catalysts for Ultraefficient Oxidation/Reduction of Organic Contaminants

Liu

Wang

et al. 2018

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The search for earth‐abundant, low‐cost, recyclable, multifunctional as well as highly active catalysts remains the most pressing demand for heterogeneous catalytic elimination of pollutants in water environment remediation. Herein, a porous graphitic carbon‐encapsulated Ni nanoparticles (NPs) hybrid (Ni@GC) is designed/constructed by direct pyrolysis of a Ni‐based metal−organic framework (MOF) in N2. The resulting Ni@GC exhibits a unique 3D hierarchical byttneria aspera‐like yolk–shell structure with a high surface area, abundant active sites as well as good microwave (MW)‐absorbing performance. The outstanding MW‐driven oxidation of norfloxacin to inorganic molecules and direct catalytic reduction of 4‐nitrophenol to less toxic and more useful chemical raw material (4‐aminophenol) can originate from the synergistic effects, including the presence of both zero‐valent Ni NPs as the active center and graphitic carbon as the protective layer/electron acceptor as well as unique porous yolk‐void‐shell structure, which facilitates the MW energy‐harvesting and/or rapid mass transfer of the reactant/product in the channels and cavities. Accordingly, the localized surface plasmon resonance–excitation and electronic relay mechanism are proposed to account for the catalytic oxidation/reduction, respectively. This work provides a new strategy for the design/assembly of multifunctional metal@GC hybrids with a unique architecture and elucidates new opportunities for remediation of environmental water.

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A vesicle-aggregation-assembly approach to highly ordered mesoporous γ-alumina microspheres with shifted double-diamond networks

Abstract: Highly ordered mesoporous γ-alumina microspheres with a shifted double-diamond mesostructure have been synthesized via a vesicle-aggregation-assembly approach.

Cited by 23 publications

References 58 publications

General Synthesis of Ultrafine Monodispersed Hybrid Nanoparticles from Highly Stable Monomicelles

General Synthesis of Ultrafine Monodispersed Hybrid Nanoparticles from Highly Stable Monomicelles

Ordered Bicontinuous Mesoporous Polymeric Semiconductor Photocatalyst

Fabrication of 3D Hierarchical Byttneria Aspera‐Like Ni@Graphitic Carbon Yolk–Shell Microspheres as Bifunctional Catalysts for Ultraefficient Oxidation/Reduction of Organic Contaminants

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