Directionally aligned macroporous SiOC via freeze casting of preceramic polymers
- Creators
- Naviroj, M.
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Miller, S. M.
- Colombo, P.
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Faber, K. T.
Abstract
A commercially available polysiloxane was used as a preceramic polymer for solution freeze casting to obtain directionally aligned porous silicon oxycarbide. We show how choice of solvent, polymer concentration, and freezing rate can affect the final pore network of the freeze-cast ceramic. Solvents of cyclohexane and camphene resulted in dendritic pores, while tert-butyl alcohol (TBA) produced intersecting cellular pores in the freeze-cast ceramic. Characterization of pore size distribution by mercury intrusion porosimetry of ceramics produced from cyclohexane–polysiloxane solutions with varying polymer concentrations and freezing rates demonstrated trends consistent with solidification theory. Fourier transform infrared spectroscopy and X-ray diffraction were employed to confirm that the freeze-casting process resulted in silicon oxycarbide of comparable chemistry and crystallinity to that produced via traditional preceramic polymer processing techniques.
Additional Information
© 2015 Elsevier Ltd. Received 24 January 2015; received in revised form 11 February 2015; accepted 14 February 2015; Available online 9 March 2015. This work was financially supported by the National Science Foundation (DMR-1411218). This work made use of the EPIC facility (NUANCE Center-Northwestern University), which has received support from the MRSEC program (NSF DMR-1121262) at the Materials Research Center; the Nanoscale Science and Engineering Center (NSF EEC–0647560) at the International Institute for Nanotechnology; and the State of Illinois, through the International Institute for Nanotechnology. This work also made use of the Optical Microscopy and Metallography Facility and the J.B. Cohen X-ray Diffraction Facility at the Materials Research Center of Northwestern University (National Science Foundation's MRSEC program, DMR-1121262). FT-IR work was performed in the Keck-II facility of NUANCE Center at Northwestern University. The NUANCE Center is supported by NSEC (NSF EEC–0647560), MRSEC (NSF DMR-1121262), the Keck Foundation, the State of Illinois, and Northwestern University. S.M.M. was supported by a NASA Space Technology Research Fellowship.Additional details
- Eprint ID
- 57612
- Resolver ID
- CaltechAUTHORS:20150518-140317330
- DMR-1411218
- NSF
- DMR-1121262
- NSF
- EEC-0647560
- NSF
- State of Illinois
- W. M. Keck Foundation
- Northwestern University
- NASA
- Created
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2015-05-18Created from EPrint's datestamp field
- Updated
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2021-11-10Created from EPrint's last_modified field