| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Thommes, Matthias
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (12/12 displayed)
- 2024Development and application of a novel model based on percolation theory for advanced pore network characterization by physical adsorption
- 2024Catalyst Supraparticles: Tuning the Structure of Spray‐Dried Pt/SiO2 Supraparticles via Salt‐Based Colloidal Manipulation to Control their Catalytic Performancecitations
- 2023Poly(ethylene oxide)-block-poly(hexyl acrylate) Copolymers as Templates for Large Mesopore Sizes─A Detailed Porosity Analysiscitations
- 2023Substituting fossil-based with bio-based chemicals: the case of limonene as a greener pore expander for micellar templated silicacitations
- 2022Spray‐Drying and Atomic Layer Deposition: Complementary Tools toward Fully Orthogonal Control of Bulk Composition and Surface Identity of Multifunctional Supraparticlescitations
- 2021Characterization of Hierarchically Ordered Porous Materials by Physisorption and Mercury Porosimetry—A Tutorial Reviewcitations
- 2021Porosimetry for Thin Films of Metal–Organic Frameworkscitations
- 2019Characterization and adsorption-based applications of nanoporous materials
- 2017Development of Intracrystalline Mesoporosity in Zeolites through Surfactant-Templatingcitations
- 2017Recent advances in the textural characterization of hierarchically structured nanoporous materialscitations
- 2012Mapping the location of grafted PNIPAAM in mesoporous SBA-15 silica using gas adsorption analysis.citations
- 2012Mapping the location of grafted PNIPAAM in mesoporous SBA-15 silica using gas adsorption analysiscitations
Places of action
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article
Poly(ethylene oxide)-block-poly(hexyl acrylate) Copolymers as Templates for Large Mesopore Sizes─A Detailed Porosity Analysis
Abstract
<p>Mesoporous materials with defined pore geometry act as important models for porous substances being applied in various fields of materials research due to their large surface area─from catalysis to coatings and from solar cells to batteries and capacitors. Thus, understanding structure-property relationships requires the capability of deliberately and precisely tuning the mesoporosity, i.e., pore diameter, connectivity, and wall thickness. However, especially for the interesting pore size range between 35 and 70 nm, only a few convenient block copolymer templates are available using micellar self-assembly. In this study, we synthesized poly(ethylene oxide)-block-poly(hexyl acrylate) copolymers (PEO-b-PHA) by a supplemental activator reducing agent atom transfer radical polymerization (SARA ATRP) and employed them as soft templates for the preparation of ordered mesoporous metal oxide powders with spherical mesopores of ca. 40 nm in diameter, as shown by scanning electron microscopy (SEM), scanning transmission electron microscopy (STEM), and small-angle X-ray scattering (SAXS). With the aid of argon physisorption, STEM-based tomography, and time-of-flight secondary ion mass spectrometry (ToF-SIMS), we performed in-depth elucidation of pore shape and their mutual connection. In the case of mesoporous silica, 40 nm spherical mesopores are connected to 3-4 adjacent pores by 15 nm pore windows as well as 1-2 nm-sized micropores. These micropores seem to originate from single PEO chains penetrating the 17 nm thick pore wall. Compared to such mesoporous silica, mesoporous, crystalline zirconia possesses significantly higher pore accessibility. Furthermore, we prepared a set of PEO-b-PHA block copolymers with different block lengths, showing that mainly the PHA block length governs the mesopore size and thus enables mesopore size tuning. These results highlight that PEO-b-PHA is a promising template for the preparation of mesoporous metal oxides (in particular, crystalline ones) with tailored mesopore sizes, which enables systematic studies on property-porosity relationships.</p>