Macroporous Ceramics from Particle-Stabilized Wet Foams

We present a novel direct-foaming method to produce macro-porous ceramics using particles instead of surfactants as stabil-izers of the wet foams. This method allows for the fabrication of ultra-stable wet foams that resist coarsening upon drying and sintering. Macroporous ceramics of various chemical compos-itions with open or closed cells, average cell sizes ranging from 10 to 300 lm and porosities within 45 % and 95%, can be easily prepared using this new approach. The sintered foams show high compressive strengths of up to 16 MPa in alumina foams with porosities of 88%. I