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Influence of SiO2 Content on Wet-foam Stability for Creation of Porous Ceramics

  • Bhaskar, Subhasree (Institute of Processing and Application of Inorganic Materials, (PAIM), Department of Advanced Material Science and Engineering, Hanseo University) ;
  • Park, Jung Gyu (Institute of Processing and Application of Inorganic Materials, (PAIM), Department of Advanced Material Science and Engineering, Hanseo University) ;
  • Cho, Gae Hyung (Institute of Processing and Application of Inorganic Materials, (PAIM), Department of Advanced Material Science and Engineering, Hanseo University) ;
  • Seo, Dong Nam (Institute of Processing and Application of Inorganic Materials, (PAIM), Department of Advanced Material Science and Engineering, Hanseo University) ;
  • Kim, Ik Jin (Institute of Processing and Application of Inorganic Materials, (PAIM), Department of Advanced Material Science and Engineering, Hanseo University)
  • Received : 2014.07.29
  • Accepted : 2014.09.11
  • Published : 2014.09.30

Abstract

The thermodynamic instability of bubbles in wet-foam colloidal suspension is due to the substantial area of their gas/liquid interface. Several physical processes lead to gas diffusion from smaller to larger bubbles, resulting in a coarsening and Ostwald ripening of wet foam. This includes a narrowing of the bubble size distribution. The distribution and microstructure of porous ceramics, the adsorption free energy and Laplace pressure of $Al_2O_3$ particle-stabilized colloidal suspension, and $SiO_2$ content were investigated for tailoring the bubble size. Wet-foam stability of more than 80% is related to the degree of hydrophobicity with contact angles of $62-70^{\circ}$ achieved from the surfactant. The contact angle replaces part of the highly energetic interface and lowers the free energy of the system. This leads to an apparent increase in the surface tension (26-33 mN/m) of the colloidal suspension.

Acknowledgement

Supported by : National Research Foundation of Korea (NRF)

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