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Influence of amphiphile on foam stability of Al2O3-SiO2 colloidal suspension to porous ceramics
Naboneeta Sarkar,박정규,서동남,Sangram Mazumder,Ashish Pokhrel,Christos G. Aneziris,김익진 한양대학교 세라믹연구소 2015 Journal of Ceramic Processing Research Vol.16 No.4
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 ℃ 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%.