Electrohydrodynamic forming of porous ceramic capsules from a preceramic polymer

Porous polymeric near-spherical capsules, similar to 3.6 mm in diameter, were prepared using an electrodydrodynamic process. These capsules were pyrolysed to porous ceramics, similar to 3 min in diameter. The ceramic capsules had interconnected pores of similar to 1.3 mu m in size,and large cells with a mean size of 28 mu m. The largerpores resemble the cells in a typical ceramic foam and were evenly distributed throughout the structure. A large proportion of the ceramic capsules contained 65-70% porosity, and their compressive strength was 0.2-0.4 MIN. (C) 2008 Elsevier B.V. All rights reserved.