Schlüter, Florian
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Schlüter, Florian
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Schlüter, Florian
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Item type:Publication, Hierarchical emulsion based hybrid ceramics synthesized with different siloxane precursor and with embedded nickel nanoparticlesAn emulsion-based synthesis route for the generation of organo-silica-based monolithic hybrid ceramics with a high content of different organic groups and embedded nickel nanoparticles is presented. By this route hybrid ceramics with a hierarchical pore size distribution and tailorable surface characteristics can be obtained. Mixtures of methyl polysiloxane (MK), tetraethyl orthosilicate (TEOS) and (3-aminopropyl)triethoxysilane (APTES) with varying ratios are selected as precursors, cross-linked, and subsequently pyrolyzed at 500 or 600 °C. In this way monolithic emulsion based hybrid ceramics with three different organo-functionalized siloxane precursor can be synthesized. Additionally, by adding the metal precursor NiCl2, metal-containing emulsion-based hybrid ceramics can be achieved. By adjusting the oil/water ratio and using high- or low internal phase emulsions (HIPEs or LIPEs), controlled micro-, meso-, and macropore distributions are obtained. After pyrolysis, materials achieve specific BET surface areas of up to 550 m2/g. Adjustable surface characteristics in terms of hydrophobicity and hydrophilicity of the material surface by thermal decomposition behavior of precursors is demonstrated. Nickel is incorporated through the formation of complexes with APTES, resulting in well-distributed metal nanoparticles with average particle sizes between 35 and 69 nm. The material properties are pivotal features for catalysis and gas separation applications.journal articleBand:49292 98 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Surfactant assisted syntheses of monolithic hybrid ceramics with hierarchical porosityA surfactant assisted emulsion-based syntheses route is presented for obtaining organo-silica-based monolithic hybrid ceramics with a hierarchical pore size distribution and tailorable surface characteristics. Methyl polysiloxane (MK) and methyl-phenyl polysiloxane (H44) with varying mixing ratios are selected as precursors, cross-linked and subsequently pyrolyzed at 500 °C or 600 °C, respectively. By adjusting the oil/water ratio and by tailoring the surfactant concentration controlled micro and macropore distributions with mesoscopic cell windows are obtained. After pyrolysis, specific surface areas of up to 600 m2/g are achieved. In addition, due to the distinguished pyrolysis decomposition behavior of MK and H44, the adjustment of the surface characteristics in terms of hydrophobicity or hydrophilicity is demonstrated. The presented surfactant assisted emulsion-based process is hence highly suitable for tailoring pore size distribution and surface characteristics at the same time. Both material properties are pivotal features for catalysis and gas separation applications.journal articleBand:35Heft:1187 108