Preparation of Fine Ceramics by Soft Chemistry |
Susmita Santra, Girija Srinarayan and Panchanan Pramanik*
Pages: 115-124
DOI : 10.1080/0371750X.2010.11090827 |
Abstract |
Nanostructured ceramic oxides exhibit novel and appreciable mechanical, electrical and magnetic properties in comparison with the bulk counterparts and therefore offer many industrial applications. Most of the research in the field of nanoscience in the past two decades has been dedicated to the synthesis routes of the fine particles. This review presents an overview of the generally followed methods for the synthesis of fine ceramic oxides with special focus on the methods suitable for bulk production of fine ceramics, particularly on the methods developed by the authors. The method developed by the authors basically involves evaporation / flame pyrolysis of a precursor solution constituting the desired metal ions dispersed in a polymeric reagent (polyhydroxy-organics). Afterward the process has been improved involving metal ions complexed with a chelating agent (diethanolamine triethanolamine, inorganic acids such as citric/oxalic/tartaric acid, EDTA, etc) and simple polyhydroxy organic compound. These reagents (polymeric/chelating/organic) play a dual role of keeping the solution homogeneous preventing precipitation of metal ions from solution during pyrolysis, and acting as template for the formation of nanostructures during combustion. A number of single phase ceramic oxides with size ranging from 10-90 nm with a narrow particle size distribution have been synthesized by the developed methods and characterized. |
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