TY - JOUR
T1 - Gelation of Aluminum Hydroxide Sols
AU - PIERRE, ALAIN C.
AU - UHLMANN, DONALD R.
PY - 1987/1
Y1 - 1987/1
N2 - 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.
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.
UR - http://www.scopus.com/inward/record.url?scp=0023157010&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0023157010&partnerID=8YFLogxK
U2 - 10.1111/j.1151-2916.1987.tb04848.x
DO - 10.1111/j.1151-2916.1987.tb04848.x
M3 - Article
AN - SCOPUS:0023157010
SN - 0002-7820
VL - 70
SP - 28
EP - 32
JO - Journal of the American Ceramic Society
JF - Journal of the American Ceramic Society
IS - 1
ER -