Cellular ceramics from emulsified suspensions of mixed particles
In this work concentrated alumina suspensions have been emulsified with decane using silica nanoparticles of a range of hydrophobicities as stabiliser giving rise to novel porous ceramic materials. The materials are characterized by open porosities between 49 and 61% and average cell sizes between 18 and 25 μm. Comparison with surfactant-stabilized emulsified suspensions is given. In particular, high temperature strength is a key property of the particle-stabilized materials.
KeywordsEmulsified suspension Pickering emulsion Cellular ceramic
The authors would like to thank DFG for funding this project within the Research Training Group 1375 ‘‘Nonmetallic Porous Structures for Physical–Chemical Functions’’ and Wacker-Chemie (Germany) for the supply of the fumed silica powders.
- 3.L.L. Hench, J. Wilson (eds.), Introduction to Bioceramics (World Scientific, Singapore, 1993)Google Scholar
- 8.M. Pulkin, D. Koch, G. Grathwohl, Silica effect on porous calcium phosphate ceramics from the freeze gelation route. Int. J. Appl. Ceram. Technol. (in press, corrected proof)Google Scholar
- 9.S. Barg, M.D.M. Innocentini, R.V. Meloni, W.S. Chacon, H. Wang, D. Koch, G. Grathwohl, Physical and high-temperature permeation features of double-layered cellular filtering membranes prepared via freeze casting of emulsified powder suspensions. J. Membr. Sci. 383, 35–43 (2011)CrossRefGoogle Scholar
- 19.S. Barg, Cellular ceramics via alkane phase emulsified powder suspensions, PhD Thesis in Production Engineering (University of Bremen, Bremen, 2010)Google Scholar
- 30.G.I. Taylor, The formation of emulsions in definable fields of flow, in Proceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character, vol. 146, no. 858 (1934), pp. 501–523Google Scholar
- 32.L.J. Gibson, M.F. Ashby, Cellular Solids: Structure & Properties (Cambridge University Press, Cambridge, 1997)Google Scholar