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Inhibation of crystal growth during drying in gels derived from a cheap, mixed metal oxide precursor

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Abstract

The influence of addition of small amounts of either citric acid or lactic acid on the formation of crystalline matter in dried gels derived from a multi-component industrial sol–gel silica precursor has been studied. The sols were water-based and had formic acid as the main acid constituent. A pronounced decrease in the extent of crystallization was observed for both acids, with citric acid being more effective than lactic acid. The results are discussed based on the complexation behavior of the corresponding acids under the studied conditions, and the complexation behavior in solution can be directly linked to the extent of crystallization in the dried gels. However, the sol–gel kinetics followed that expected for a purely silica-based sol, which suggests that the kinetics is mainly controlled by the silica portion of the sol. The results are suggested to be of importance for the industrial use of these sols as binders, as pronounced crystallization in the gels upon drying may lead to mechanical stresses, and thus to a decreased binder performance.

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Acknowledgments

The funding provided by Paroc Oy Ab and the Finnish Technology Development Agency, TEKES, is gratefully acknowledged.

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Authors and Affiliations

  1. Center for Functional Materials, Department of Physical Chemistry, Åbo Akademi University, Porthansgatan 3-5, 20500, Turku, Finland

    Janne Puputti, Qian Xu & Mika Lindén

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  1. Janne Puputti
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  2. Qian Xu
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  3. Mika Lindén
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Correspondence to Mika Lindén.

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Puputti, J., Xu, Q. & Lindén, M. Inhibation of crystal growth during drying in gels derived from a cheap, mixed metal oxide precursor. J Sol-Gel Sci Technol 47, 347–353 (2008). https://doi.org/10.1007/s10971-008-1785-1

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  • DOI: https://doi.org/10.1007/s10971-008-1785-1

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