Gelation of Aluminum Hydroxide Sols

ALAIN C. PIERRE; DONALD R. UHLMANN

doi:10.1111/j.1151-2916.1987.tb04848.x

Gelation of Aluminum Hydroxide Sols

ALAIN C. PIERRE, DONALD R. UHLMANN

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Abstract

The gelation of aluminum hydroxide sols obtained from aluminum sec‐butoxide has been studied as a function of the conditions of preparation, including pH, temperature, and time of aging. The preceding studies of Yoldas have been extended in more acidic conditions, up to a molar proportion of 1.12 HNO₃ per Al(OC₄H₉)₃. It has been found that stable sols can easily be obtained by processing at any temperature between 20° and 90°C beyond a molar proportion of 0.28 HNO₃. The corresponding gels are suggested to have a boehmite‐like structure in which there is a metastable folding of the (020) layers at 20°C, and a stable unfolding at 80°C, the two structures coexisting at intermediate processing temperatures.

Original language	English (US)
Pages (from-to)	28-32
Number of pages	5
Journal	Journal of the American Ceramic Society
Volume	70
Issue number	1
DOIs	https://doi.org/10.1111/j.1151-2916.1987.tb04848.x
State	Published - Jan 1987

ASJC Scopus subject areas

Ceramics and Composites
Materials Chemistry

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10.1111/j.1151-2916.1987.tb04848.x

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AB - The gelation of aluminum hydroxide sols obtained from aluminum sec‐butoxide has been studied as a function of the conditions of preparation, including pH, temperature, and time of aging. The preceding studies of Yoldas have been extended in more acidic conditions, up to a molar proportion of 1.12 HNO3 per Al(OC4H9)3. It has been found that stable sols can easily be obtained by processing at any temperature between 20° and 90°C beyond a molar proportion of 0.28 HNO3. The corresponding gels are suggested to have a boehmite‐like structure in which there is a metastable folding of the (020) layers at 20°C, and a stable unfolding at 80°C, the two structures coexisting at intermediate processing temperatures.

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Gelation of Aluminum Hydroxide Sols

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