Articles
  • Influence of amphiphile on foam stability of Al2O3-SiO2 colloidal suspension to porous ceramics
  • Naboneeta Sarkara, Jung Gyu Parka, Dong Nam Seoa, Sangram Mazumdera, Ashish Pokhrelb, Christos G. Anezirisb and Ik Jin Kima,*
  • a Institute of Processing and Application of Inorganic Materials, (PAIM),Hanseo University # 360, Seosan-si, Chungnam, 356- 706, Korea b Institute of Ceramics, Glass and Construction Materials, Freiberg University, Agricolastrasse 17, 09599 Freiberg, Germany
Abstract
The stabilization of wet foam is very important to avoid the instability caused by the large interfacial area at gas-liquid interface of colloid suspension. Propionic acid, a short chain carboxylic acid is used as foam stabilizer, which acts by modifying the particle surface and increases the wet foam stability. The characterization of Al2O3-SiO2 foams, namely Laplace pressure, foam stability, air content and bubble size are explored by changing the concentration of the amphiphile. Macroporous Al2O3- SiO2 ceramics with open or closed cells, average pore size of less than 100 μm and porosities within 43 and 51% was prepared by direct foaming process. The sample sintered at 1300 oC for 1 hour showed an adsorption free energy of 0.9 × 107 to 2.0 × 108 kTs and a Laplace pressure of 0.63 to 0.85 mPa, highlighting good wet foam stability of approximately 80-90%.

Keywords: Porous ceramics, Direct foaming, Wet foam stability, Carboxylic acid, Laplace pressure, Adsorption free energy.

This Article

  • 2015; 16(4): 392-396

    Published on Aug 31, 2015

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