Self-assembled microstructured polymeric and ceramic surfaces

Woiton, Michael; Heyder, Madeleine; Laskowsky, Alexandra; Stern, Edda; Scheffler, Michael; Brabec, Christoph J.

doi:10.1016/j.jeurceramsoc.2011.03.001

Cited by 16 publications

(9 citation statements)

References 22 publications

(22 reference statements)

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“…Such netlike structures have been observed before in coatings in the system of MK and H62C. [34,35] It is assumed that these netlike structures are a result of demixing processes of the both preceramic polymers. Elementary analysis in EDX measurements (results not shown) indicate that the matrix is formed out of MK and the alumina filler and that the dispersed phase is formed out of H62C, because the dispersed phase shows a higher amount of Carbon in comparison to the matrix.…”

Section: Contact Angle and Surface Structuresupporting

confidence: 54%

Tailored Surface Properties of Ceramic Foams for Liquid Multiphase Reactions

et al. 2017

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Open cellular ceramic foams are prepared using the replica method. In a second step, these foams are coated with a pre-ceramic or polymer-derived ceramic coating, respectively. Polymer-to-ceramic transformation is studied by SEM with respect to the microstructure, functional groups are characterized by Raman microscopy, density and porosity are determined by pycnometer measurements as well as the surface free energy by means of contact angle measurements. By pyrolysis at different temperatures between 403 and 1273 K, the surface wettability is adjusted in a wide range from hydrophilic to hydrophobic due to the release of organic groups from the pre-ceramic polymers in terms of polymer-toceramic transformation. Coated foams are tested in a new potential application: as reactor internals to increase the liquid-liquid interface area in a homogeneously catalyzed multiphase system. As model reaction, a reactive extraction of an organic dye was used and the influence of the surface energy of the foam on the phase dispersion/reaction rate is discussed. The coated foams are able to increase the reaction rate to an extent depending on the surface wettability.

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Section: Contact Angle and Surface Structuresupporting

confidence: 54%

Tailored Surface Properties of Ceramic Foams for Liquid Multiphase Reactions

et al. 2017

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“…To get a deeper understanding of the structure forming process and parameters relevant for the control of the netlike structure, the solubility of the preceramic polymers in different organic solvents was investigated (Woiton et al 2011). It was found that a poly(methyl silsesquioxane), PMS, and a poly(methyl phenyl silsesquioxane), PMPS, are immiscible, which results in a demixing process during evaporation of the methanol in filler-free coating systems.…”

Section: Control Of Surface Area By Demixing and Dewetting Transitionsmentioning

confidence: 99%

“…In filler-containing systems, the filler size and the type of filler play an important role for the structure forming process, and it was found that dewetting of the preceramic polymer from the filler particles is the major driving force for the structure formation. More details might be found in (Woiton 2011). …”

Section: Control Of Surface Area By Demixing and Dewetting Transitionsmentioning

confidence: 99%

Ceramics for Sustainable Energy Technologies with a Focus on Polymer-Derived Ceramics

Konegger

Torrey

Flores

et al. 2014

Novel Combustion Concepts for Sustainable Energy Development

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Due to their high hardness, high temperature stability, and high chemical stability, ceramic materials have significant uses and potential in existing and emerging sustainable technologies. In this paper, we provide a thorough overview of ceramics in a variety of sustainable applications. This is followed by a detailed discussion of an emerging process to make ceramics called polymer (or precursor)-derived ceramics. It is shown that due to the versatility of this process in making a wide range of shapes-fibers, coatings, and porous ceramics, this is an attractive route to make ceramics that will be a critical element in the next generation of sustainable technologies.

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“…2.2.2. To get a deeper understanding of the structure forming process and parameters relevant for the control of the netlike structure, the solubility of the preceramic polymers in different organic solvents was investigated (Woiton et al 2011). An example of the structure of such a coating is shown in Fig.…”

Section: Control Of Surface Area By Demixing and Dewetting Transitionsmentioning

confidence: 99%