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Highly-closed/-Open Porous Ceramics with Micro-Beads by Direct Foaming

  • Jang, Woo Young (Institute of Processing and Application of Inorganic Materials (PAIM), Department of Advanced Materials Science and Engineering, Hanseo University) ;
  • Seo, Dong Nam (Institute of Processing and Application of Inorganic Materials (PAIM), Department of Advanced Materials Science and Engineering, Hanseo University) ;
  • Park, Jung Gyu (Institute of Processing and Application of Inorganic Materials (PAIM), Department of Advanced Materials Science and Engineering, Hanseo University) ;
  • Kim, Hyung Tae (Engineering Ceramics Team, Korea Institute of Ceramic Engineering and Technology (KICET)) ;
  • Lee, Sung Min (Engineering Ceramics Team, Korea Institute of Ceramic Engineering and Technology (KICET)) ;
  • Kim, Suk Young (School of Materials Science & Engineering, Yeungnam University) ;
  • Kim, Ik Jin (Institute of Processing and Application of Inorganic Materials (PAIM), Department of Advanced Materials Science and Engineering, Hanseo University)
  • Received : 2016.08.05
  • Accepted : 2016.10.31
  • Published : 2016.11.30

Abstract

This study reports on wet-foam stability with respect to porous ceramics from a particle-stabilized colloidal suspension that is achieved through the addition of polymethyl methacrylate (PMMA) using a wet process. To stabilize the wet foam, an initial colloidal suspension of $Al_2O_3$ was partially hydrophobized by the surfactant propyl gallate (2 wt.%) and $SiO_2$ was added as a stabilizer. The influence of the PMMA content on the bubble size, pore size, and pore distribution in terms of the contact angle, surface tension, adsorption free energy, and Laplace pressure are described in this paper. The results show a wet-foam stability of more than 83%, which corresponds to a particle free energy of $2.7{\times}10^{-12}J$ and a pressure difference of 61.1 mPa for colloidal particles with 20 wt.% of PMMA beads. It was possible to control the uniform distribution of the open/closed pores by increasing the PMMA content and by adding thick struts, leading to the achievement of a higher-stability wet foam for use in porous ceramics.

Keywords

References

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