Abstract
This study reports on the wet-foam stability of porous ceramics that are formed from a particle-stabilized colloidal suspension for which the direct-foaming method is used. To stabilize the wet foam, an initial colloidal suspension of silicon carbide (SiC) was partially hydrophobized by the surfactant octylamine (12.5 wt.%). The influence of the binder content on the wet-foam stability in terms of the air content, bubble size, contact angle, surface tension, surface-free energy, Laplace pressure, and relative bubble size is described in this paper. The results show a wet-foam stability of more than 95% that corresponds to an air content of 87.8%, an increase of the adsorption free energy from 3.0 × 10−5 to nearly 7.5 × 10−5 J, a Laplace pressure increase from 0.16 to 0.20 mPa, and a relative bubble size of 1.3 for the colloidal particles with a 20 wt% binder content. The uniform distribution of the highly open/interconnected pores could be controlled with thick struts and an increasing of the binder content up to 20 wt%, leading to the achievement of a higher-stability wet foam with respect to the porous ceramic.
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This research was financially supported by Hanseo University, and it was conducted under the framework of the research and development program of the Korea Institute of Energy Research (B6-2455).
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Jang, W.Y., Park, J.G., Basnet, B. et al. Highly porous SiC ceramics from particle-stabilized suspension. J Aust Ceram Soc 53, 657–665 (2017). https://doi.org/10.1007/s41779-017-0077-z
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DOI: https://doi.org/10.1007/s41779-017-0077-z