Fabrication of ceramic particles from preceramic polymers using stop flow lithography
| Autor: | Paolo Colombo, Carlos J. Martinez, Alejandro M. Alcaraz, Johanna Schmidt |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Fabrication 02 engineering and technology 01 natural sciences law.invention law 0103 physical sciences Materials Chemistry Ceramic Oxycarbide Preceramic Pyrolysis Siloxane Stop-flow Composite material Fourier transform infrared spectroscopy Lithography 010302 applied physics chemistry.chemical_classification Polymer 021001 nanoscience & nanotechnology chemistry visual_art Ceramics and Composites visual_art.visual_art_medium Particle Photolithography 0210 nano-technology |
| Zdroj: | Journal of the European Ceramic Society. 41:3314-3320 |
| ISSN: | 0955-2219 |
| DOI: | 10.1016/j.jeurceramsoc.2020.11.045 |
| Popis: | Stop flow lithography (SFL) combines aspects of microfluidic and photolithography to continuously fabricate particles with uniform planar shapes as dictated by a mask. In this work we aim to expand the palette of materials suitable for SFL processing by investigating the use of UV-crosslinkable preceramic polymers to make ceramic particles. A commercially available methacrylated-polysiloxane was used as the preceramic polymer and was mixed with 2.5 wt% Irgacure 651 photoinitiator. A simple SFL system was assembled to continuously fabricate UV-crosslinked preceramic polymer particles in the shape of hexagons, triangles, and gears with diameters ranging from 100 to 200 μm and thicknesses of 74 μm +/- 4 μm. Particles were harvested from the excess preceramic solution, cleaned and then pyrolyzed at 1000 °C to transform them into silicon oxycarbide ceramic particles. Particle shape was maintained during pyrolysis despite a ∼80 % linear shrinkage due to the removal of acryl and methyl side groups, as confirmed via FTIR. After pyrolysis the outer diameters of the SiOC particles ranged from 20 to 40 μm with thicknesses of 10 μm–12 μm. Pyrolyzed particles were successfully recovered and dispersed in water. This work demonstrates a robust path for the fabrication of ceramic particles with specific shapes from preceramic polymers via SFL. |
| Databáze: | OpenAIRE |
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