Synthesis of replica mesostructures by the nanocasting strategy

Yang, Haifeng; Zhao, Dongyuan

doi:10.1039/b414402c

Cited by 276 publications

(375 citation statements)

References 99 publications

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“…Secondly, the related hydrated metal nitrate precursors were introduced via highly enhanced host-guest interactions such as hydrogen bonding, Coulombic interactions, coordinating interactions, and van der Waals interactions. 53 Thirdly, the mesostructured pattern was formed and the guest materials crystallized using the thermal calcination method. Fourthly, the silica host was etched with a dilute NaOH aqueous solution in order to obtain the final mesostructured binary metal oxides.…”

Section: Template Removal and Preparation Of 3d Mesoporous Cuo X -Ceomentioning

confidence: 99%

Facile preparation of 3D ordered mesoporous CuOx–CeO2 with notably enhanced efficiency for the low temperature oxidation of heteroatom-containing volatile organic compounds

Chen

et al. 2013

RSC Adv.

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SBA-16 silica with intact surface hydroxyl groups was quickly obtained (5 min) via a fast-microwaveassisted method, and further adopted as an efficient template for the synthesis of three-dimensional (3D) ordered mesoporous CuO x -CeO 2 catalysts (htpCCx) through a simple and reproducible host-guest interaction. XRD, XPS, H 2 -TPR, and Raman results reveal that many of the Cu 2+ ions in htpCCx are incorporated into the CeO 2 lattice, leading to the formation of a Cu x Ce 12x O 22d solid solution, which produces a large number of oxygen vacancies and enhances the reducibility of the metal. The interaction of Cu and Ce is essential to the reaction as it maintains the Cu 2+ /Cu 1+ and Ce 4+ /Ce 3+ redox couples. The catalyst has a 3D mesostructure and possesses remarkably enhanced low-temperature activity for the combustion of epichlorohydrin. HtpCC20 has been identified as the most powerful catalyst for this reaction, with the reaction rate at 165 uC being about 6.3 and 33.3 times higher than those of catalysts synthesized using conventional incipient impregnation and thermal combustion methods, respectively. Furthermore, htpCC20 shows superior CO 2 selectivity (.99%) and stability (no deactivation occurs after 50 h reaction). It is believed that the dispersion of the active phase, density of surface active oxygen, and lowtemperature reducibility are the dominant factors governing the catalytic performance.

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Section: Template Removal and Preparation Of 3d Mesoporous Cuo X -Ceomentioning

confidence: 99%

Facile preparation of 3D ordered mesoporous CuOx–CeO2 with notably enhanced efficiency for the low temperature oxidation of heteroatom-containing volatile organic compounds

Chen

et al. 2013

RSC Adv.

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“…Which functional groups in the inorganic templates can have proper interactions with the precursor molecules? As reported previously, both the silanols located on hollowed out mesopore walls and the copolymers in surfactant/silica hybrid materials can coordinate with the guest molecules (75,89).…”

Section: ) Improving the Interaction Between Template And Precursormentioning

confidence: 78%

“…The most fascinating success is the replication of mesoporous carbon materials (75). However, other inorganic replicas are not as successful, that normally consist of disordered nanowires or nanoparticles without long-range periodicity owing to the partial loadings of precursors inside the mesopores and the fast growth of precursor molecules outside the mesopores (89). How to promote the filling of precursors into the hard templates is therefore an urgent task.…”

Section: Confined-space Assemblymentioning

confidence: 99%

“…How to promote the filling of precursors into the hard templates is therefore an urgent task. Recently, we summarize the work about the synthesis of the replicated mesostructures prepared by the hardtemplate approach of mesoporous silica (89). Evidently, improving the interactions between template and precursor and between precursors themselves are essential in the hard-template approach.…”

Section: Confined-space Assemblymentioning

confidence: 99%

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General Synthesis of Ordered Nonsiliceous Mesoporous Materials

Wan

Yang

Zhao

2008

ACS Symposium Series

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The design of ordered nonsiliceous mesoporous materials is illustrated based on the surfactant assembly and confinedspace growth. These materials include mesoporous metal oxides, polymers, and carbons with open framework structures, and single-crystal metal, metal oxide and carbon nanoarrays with replicated mesostructures. A generalized "acid-base pair" concept, which self-adjusts the acidity and homogeneity of the inorganic precursor, is proposed to prepare highly ordered mesoporous metal oxides, phosphates and borates, as well as mixed metal oxides and phosphates, with diverse structures. Mesoscopically ordered polymer frameworks with uniformly large pore sizes are derived from the self-assembly from organic templates and organic precursors. Heating these materials transforms them to homologous carbon frameworks. Microwave digested method is an efficient way to enhance the adsorption property of hard silica templates in fabricating ordered nonsiliceous single-crystal nanoarrays. The coordination of organic surfactants with metal ions is also a method to increase the interaction between hard templates and precursors. A one-step impregnation process is used to fabricate ordered silica monoliths with various metal oxide nanocrystals. Improving the interactions between the precursors themselves plays an essential role in replicating ordered mesoporous CdS, SiC and graphitized carbons. Preliminary applications in bone-forming materials, biosensors and electrodes are presented as well.

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“…During the last 20 years, a significant progress has been achieved in the field of ordered mesoporous silicas (OMSs) [1][2][3]. OMSs constitute an exciting field in materials chemistry due to many potential applications in catalysis, sensing, separation, and adsorption processes [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

SBA-15 silicas containing sucrose

Barczak

Oszust-Cieniuch

Borowski

et al. 2011

J Therm Anal Calorim

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Mesoporous silicas were synthesized by condensation of tetraethoxysilane (TEOS) in the presence of Pluronic P123 as a structure-forming agent, and sucrose as an auxiliary agent, to investigate the effect of sucrose and aging temperature on the final properties, particularly structure-adsorption characteristics. Obtained materials have been characterized by XRD, nitrogen sorption measurements SEM-EDX, TEM, thermogravimetry, and FT-IR. The obtained materials have well-developed porous structure-values of the specific surface area (S BET ) are in the range of 300-950 m 2 /g and the sizes of primary mesopores are in the range of 9-11 nm. It was established that S BET and ordering significantly decreases with an increasing content of sucrose in the initial mixture.

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Synthesis of replica mesostructures by the nanocasting strategy

Cited by 276 publications

References 99 publications

Facile preparation of 3D ordered mesoporous CuOx–CeO2 with notably enhanced efficiency for the low temperature oxidation of heteroatom-containing volatile organic compounds

Facile preparation of 3D ordered mesoporous CuOx–CeO2 with notably enhanced efficiency for the low temperature oxidation of heteroatom-containing volatile organic compounds

General Synthesis of Ordered Nonsiliceous Mesoporous Materials

SBA-15 silicas containing sucrose

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