Synthesis of eucryptite spheres
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Eucryptite spheres with average diameters in the range 40–60 μm were synthesized using a newly developed sol-emulsion-gel approach. Unlike the conventional method, emulsions were prepared with aqueous powder suspensions. With this scheme, a large-scale production of eucryptite spheres, from suspensions with a solid content of 50–60wt%, is readily straightforward. We found that emulsions are formed in a narrow synthesis range determined by the large number of experimental parameters such as the composition of the suspension, the type/amount of the organic solvent and of the surfactant. Although the formation of eucryptite spheres is sensitive to a small variation in these parameters, we have established optimal synthesis conditions for their formation.
KeywordsSurfactant MgAl2O4 Span80 Solid Loading Magnesium Nitrate
The authors thank Prof. Dr. Bauer, head of the Institute, for her kind interest in this work. They gratefully acknowledge DFG (Deutsche Forschungsgemeinschaft) for a Research Fellowship. Thanks are also given to Dr. M. Uhlmann for performing the rheological measurements; H. Landeck for particle size measurements; Dr. V. Wilker for XRD measurements; Dr. W. Wiehe for SEM analysis (Central Analytical Laboratory, BTU Cottbus). G. Kunz is thanked for the technical support and P. Meinhardt for the friendly working atmosphere.
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