By Edited by Pietro VINCENZINI World Academy of Ceramics and National Research Council, Italy Co-edited by Michele DONDI CNR-ISTEC, Italy
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Extra resources for 12th INTERNATIONAL CERAMICS CONGRESS PART G Proceedings of the 12 th International Ceramics Congress, part of CIMTEC 2010- 12 th International Ceramics Congress and 5th Forum on New Materials Montecatini Terme, Italy, June 6-11, 2010
Fig. 2 shows the fractional mass gain rates in Stage II (Stage II gradient) plotted against firing temperature. It can be seen that the fractional mass gain rates for samples fired at 700 oC and 800 oC are nearly the same. The Stage II gradient has its maximum value in the firing range 700-800 oC. As the firing temperature is increased, the Stage II gradient decreases. Figure 2. Variation of the fractional mass gain rate (Stage II gradient) with firing temperature for fired kaolin. Pietro VINCENZINI and Michele DONDI 41 A sharp drop in the fractional mass gain rate was noticed for samples fired at 900 oC.
The initial template can be removed and replaced in the interlamellar spaces by different types of silane, being covalently grafted to the solid by reaction with the surface silanols. The lamellar stacking periodicity remains after this modification. The surfactant extraction can lead in significant grafting of isopropanol if the solid is simply refluxed in isopropanol, which have the effect of preserving the periodicity of the lamellar stacking. The surfactant extraction in an Soxhlet equipment avoid this reaction, with the effect of platelets organization collapsing.
Moreover, it has been demonstrated that both moisture expansion and mass gain of freshly fired clays follow a two-stage process, each stage being linear with (time)1/4 . One of the main applications of this discovery has been a new dating method for archeological ceramics called Pietro VINCENZINI and Michele DONDI 39 “rehydroxylation (RHX) dating” which is based on the measurement of the mass gain rate in a reheated material . As a consequence of the direct relationship between moisture expansion and mass gain, we believe that studies of mass gain can help in revealing the underlying mechanisms of moisture expansion, the associated phenomenon, in fired clay ceramics.