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Tga and Dta Studies of Solvent-Exchanged Gels

Published online by Cambridge University Press:  21 February 2011

Kurt Leeb ,
Hildrun Durakpasa  and
Manfred W. Breiter
Kurt Leeb
Affiliation:
TU Wien, Institute of Technical Electrochemistry, 9 Getreidemarkt, 1060 Wien,Austria
Hildrun Durakpasa
Affiliation:
TU Wien, Institute of Technical Electrochemistry, 9 Getreidemarkt, 1060 Wien,Austria
Manfred W. Breiter
Affiliation:
TU Wien, Institute of Technical Electrochemistry, 9 Getreidemarkt, 1060 Wien,Austria
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Abstract

Sols were prepared in the system TMOS:H2O:SOLV:HC1 with molar ratios of 1:4:3:0.0005 for SOLV = MeOH, EtOH and DMF. The gelation and aging of these sols took place in cuvettes covered by parafilm. The gels were removed from the cuvettes 14 days after gelation. Solvent exchange was carried out in each of the three solvents for a period of 14 days. Starting with fresh solvent, the exchange was repeated three times.

TGA and DTA curves were taken with pieces of the original gels and of gels after the 2nd and 3rd solvent exchange. The TGA curves display a considerable weight loss in the temperature range of solvent evaporation. A small step is observed at higher temperatures if MeOH or EtOH represent the exchange solvent. The DTA curves allow a distinction what mixtures of solvents are present. The effectiveness of the solvent exchange can be evaluated.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 346: Symposium N – Better Ceramics Through Chemistry VI , 1994 , 255
Copyright
Copyright © Materials Research Society 1998

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References

REFERENCES

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