Tracer Diffusion in Silica Inverse Opals

Cherdhirankorn, Thipphaya; Retsch, Markus; Jonas, Ulrich; Butt, Hans‐Jürgen; Koynov, Kaloian

doi:10.1021/la1002572

Cited by 36 publications

(34 citation statements)

References 75 publications

(106 reference statements)

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“…Both high order and disorder may be beneficial in different scenarios. For example, the ability to produce crystalline IO assemblies is critical for the creation of well‐defined porous networks with highly regular pathways for diffusion, which can be characterized experimentally and also theoretically modeled towards the rational design of catalytic architectures . Moreover, disorder may lead to the deterioration of certain beneficial properties, for example, when it suppresses the slow light effect, which otherwise would enhance light absorption for photocatalytic applications .…”

Section: Control Of Pore Connectivity and Disorder With Raspberry Parmentioning

confidence: 99%

Modular Design of Advanced Catalytic Materials Using Hybrid Organic–Inorganic Raspberry Particles

Shirman

Shneidman

et al. 2017

Adv Funct Materials

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Catalysis is one of the most sophisticated areas of materials research that encompasses a diverse set of materials and phenomena occurring on multiple length and time scales. Designing catalysts that can be broadly applied toward global energy and environmental challenges requires the development of universal frameworks for complex catalytic systems through rational and independent (or quasi-independent) optimization of multiple structural and compositional features. Toward addressing this goal, a modular platform is presented in which sacrificial organic colloids bearing catalytic nanoparticles on their surfaces self-assemble with matrix precursors, simultaneously structuring the resulting porous networks and fine-tuning the locations of catalyst particles. This strategy allows combinatorial variations of the material building blocks and their organization, in turn providing numerous degrees of freedom for optimizing the material's functional properties, from the nanoscale to the macroscale. The platform enables systematic studies and rational design of efficient and robust systems for a wide range of catalytic and photocatalytic reactions, as well as their integration into industrial and other real-life environments.

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Section: Control Of Pore Connectivity and Disorder With Raspberry Parmentioning

confidence: 99%

Modular Design of Advanced Catalytic Materials Using Hybrid Organic–Inorganic Raspberry Particles

Shirman

Shneidman

et al. 2017

Adv Funct Materials

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“…In principle, the hydrodynamic radii of fluorescent species can also be extracted from the coefficient of diffusion measured by FCS. However, since diluting to a nanomolar concentration is required for a proper use of FCS,38, 39 the same problems as for DLS were observed while diluting the system (data not shown), that is, the results were dependent on dilution.…”

Section: Resultsmentioning

confidence: 82%

Particle Formation in the Emulsion‐Solvent Evaporation Process

Staff¹,

Schaeffel²,

Turshatov³

et al. 2013

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The mechanism of particle formation from submicrometer emulsion droplets by solvent evaporation is revisited. A combination of dynamic light scattering, fluorescence resonance energy transfer, zeta potential measurements, and fluorescence cross-correlation spectroscopy is used to analyze the colloids during the evaporation process. It is shown that a combination of different methods yields reliable and quantitative data for describing the fate of the droplets during the process. The results indicate that coalescence plays a minor role during the process; the relatively large size distribution of the obtained polymer colloids can be explained by the droplet distribution after their formation.

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“…This in turn allows tuning the transport properties of IOs that are determined by a complex diffusion behavior. [26][27][28] For example, T. Cherdhirankorn et al [26] studied the diffusion of small fluorescent tracers in macro-mesoporous SiO 2 À IOs and identified three distinct diffusion modes: a) diffusion limited by the geometric constraints given by the macropores in the IO, b) slow diffusion inside the mesoporous matrix of the silica scaffold, and c) diffusion limited by adsorption on the pore walls. IOs are thus very useful model systems to study the transport properties of reactant molecules involved in heterogeneous catalytic reactions.…”

Section: Introductionmentioning

confidence: 99%

Hierarchical Silica Inverse Opals as a Catalyst Support for Asymmetric Molecular Heterogeneous Catalysis with Chiral Rh‐diene Complexes

et al. 2021

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The efficacy of heterogeneous catalysis relies heavily on diffusion and distribution of reactants within catalyst supports. However, the presence of confinement, essential for reaction selectivity, drastically slows down molecular transport. Here, macro-mesoporous silica inverse opal (SiO 2 À IO) films were used as a model system to study the rather unexplored molecular infiltration behavior using a probe molecule resembling a catalyst via confocal laser scanning microscopy (CLSM). CLSM analysis revealed homogeneous tracer distribution in SiO 2 À IO and attachment to both transport and mesopores. Bulk macro-mesoporous SiO 2 À IO support was used for the attachment of mono-and bis-functionalized chiral Rh-diene complexes, and the catalytic activity and selectivity with respect to the support was studied. Lower enantioselectivity was observed with the bis-functionalized ligand due to ligand entanglement and reduced accessibility of the active site, while the monofunctionalized ligand gave an excellent enantioselectivity of 94 %ee in the asymmetric 1,2-addition of triphenylboroxine to N-tosylimines and could be recycled up to three times.

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Tracer Diffusion in Silica Inverse Opals

Cited by 36 publications

References 75 publications

Modular Design of Advanced Catalytic Materials Using Hybrid Organic–Inorganic Raspberry Particles

Modular Design of Advanced Catalytic Materials Using Hybrid Organic–Inorganic Raspberry Particles

Particle Formation in the Emulsion‐Solvent Evaporation Process

Hierarchical Silica Inverse Opals as a Catalyst Support for Asymmetric Molecular Heterogeneous Catalysis with Chiral Rh‐diene Complexes

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