Advances in Microporous and Mesoporous Solids—Highlights of Recent Progress

Stein, Andreas

doi:10.1002/adma.200300007

Cited by 733 publications

(395 citation statements)

References 105 publications

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“…The incoherent (relaxation) contribution R 2 solid is generally expected to be much smaller than R 2 ResDip in the solid state, due to low molecular mobilities. We hypothesize that, in the critical exchange regime, R 2 ′ may be dominated by the chemical-exchange contribution, R 2 exch , and thus have more liquid-like character.…”

Section: Resdipmentioning

confidence: 99%

“…Mesostructured and mesoporous inorganic solids have specific properties that make them attractive for a wide range of potential applications in catalysis, 1 separations, 2 or optoelectronics. 3,4 The properties of these solids depend on their compositions, structures, and dynamics, often across several length scales, which are challenging to characterize, understand, and control.…”

Section: Introductionmentioning

confidence: 99%

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Dynamics and Disorder in Surfactant-Templated Silicate Layers Studied by Solid-State NMR Dephasing Times and Correlated Line Shapes

et al. 2008

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Section: Resdipmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dynamics and Disorder in Surfactant-Templated Silicate Layers Studied by Solid-State NMR Dephasing Times and Correlated Line Shapes

et al. 2008

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“…71 Therefore, novel approaches are in urgent need for controllable synthesis of PMOs with desired morphology and structure. Some excellent reviews have been published describing the developments in the fields of synthesis and applications of mesoporous materials.…”

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confidence: 99%

Functionalized periodic mesoporous organosilicas for catalysis

et al. 2009

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Periodic mesoporous organosilicas (PMOs), one of most advanced organic-inorganic hybrid materials, have attracted much research attention because of their combined advantages of ordered mesoporous structure and fusion of organic and inorganic fragments within the pore wall. PMOs with diverse mesostructures, morphologies and compositions have emerged in the past few years, and shown unprecedented properties. Recent years have seen the great progress in the controlled synthesis of functionalized PMOs towards specific application demands, particularly in catalysis. This Feature Article describes selected examples of the synthesis of functionalized PMOs for catalytic applications in the past few years.

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“…However, this approach does not work to prepare silica systems with similar porous structures [15]. To date, only hard template routes, such as colloidal crystals, have been successfully used in the construction of macro-mesoporous materials [4]. It remains a challenge to find a facile and efficient route to the fabrication of hierarchically ordered macro-mesostructures.…”

Section: Introductionmentioning

confidence: 99%

Macro–mesoporous silicas complex and the carbon replica

Bao

et al. 2007

Microporous and Mesoporous Materials

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Novel macroporous silicas with ordered mesoporous wall structures (~15 nm in pore size) have been synthesized by finely balancing the emulsification of the oil phase with the self-assembly of the amphiphilic block copolymers. The nanocasting method was used to produce hierarchically ordered macro-mesoporous carbon materials. These porous materials have potential applications in catalysis, sorption, separation, etc.Keywords: Hierarchy; Macro-mesoporous; Silica; Carbon; Emulsion; Hydrophobic-hydrophilic balance IntroductionSince the first report of self-assembled mesoporous silicas [1], great efforts have been made to construct inorganic hierarchical structures [2], especially materials with multimodal porosity [3], which is of great importance in the fields of controlled drug-delivery, catalysis, adsorption, and other energy-related applications. Various approaches have been invented for the fabrication of multimodal porous materials, which are well summarized in recent review papers [4,5]. Emulsion templating has been considered one of the most promising routes to produce macroporous materials with tunable pore sizes from 50 nm to a few micrometers [6]. The introduction of macroporosity into mesoporous materials by emulsion templating, however, was found to be far more difficult than expected [7]. For example, for the amphiphilic block copolymers involved emulsion systems [8], strong interactions between oil phase and amphiphilic block copolymers, especially when large amounts of oil (e.g., TMB) was used, often leads to the destruction of mesoscale ordering, forming a lamellar [9] or mesocellular foam (MCF) structures eventually [10]. On the other hand, systems with weaker oil-surfactant interactions are not easily emulsified. As a result, very large hollow spheres (a few micrometers in diameter) with mesoporous walls were obtained, in which high intrusion energy (high stir speed) was often involved [11]. In other works, vesicle structures [12], giant surfactant superstructures [13,14], even bubbles etc. have been used to assist in the construction of macro-mesoporous materials. Su et al. [14] have synthesized a set of hierarchically macro-mesoporous metal oxide in a single surfactant system, in which the templating of giant surfactant superstructures (from unreacted excess surfactant) is responsible for the formation of channel-like macropore systems. However, this approach does not work to prepare silica systems with similar porous structures [15]. To date, only hard template routes, such as colloidal crystals, have been successfully used in the construction of macro-mesoporous materials [4]. It remains a challenge to find a facile and efficient route to the fabrication of hierarchically ordered macro-mesostructures. Our previous studies show that different alkanes have different interactions with P123 amphiphilic block copolymer. By tuning the initial reaction temperatures and compositions of the synthetic mixture, control of inorganic-organic micelle arrangements may be achieved. As a result, mesopor...

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Advances in Microporous and Mesoporous Solids—Highlights of Recent Progress

Cited by 733 publications

References 105 publications

Dynamics and Disorder in Surfactant-Templated Silicate Layers Studied by Solid-State NMR Dephasing Times and Correlated Line Shapes

Dynamics and Disorder in Surfactant-Templated Silicate Layers Studied by Solid-State NMR Dephasing Times and Correlated Line Shapes

Functionalized periodic mesoporous organosilicas for catalysis

Macro–mesoporous silicas complex and the carbon replica

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