TY - JOUR
AU - Zrínyi, M.
AB - Optically clear aluminosilicate gels of different chemical compositions (0–0.9 mole ratios of total Al/(Si + Al)) were prepared directly from solutions of inorganic aluminum salts, tetraethoxysilane, water and alcohol without the time-consuming sol forming. However, in these gels only 0–75% of total Al content was incorporated by chemical bonding into the gel network depending on the compositions of gels and the preparation conditions. The incorporation of aluminum atoms into the gel framework and the structure of wet gels were investigated by chemical analysis, 27Al magic angle spinning nuclear magnetic resonance, and small angle X-ray scattering. The present method may be most favourable for the preparation of aluminosilicate gels with 0.30–0.70 mole ratios of total Al/(Si + Al). At lower Al content acidic catalysis is required. Above 0.70 mole ratio homogeneous gels cannot be obtained by this method. The highest aluminum incorporation in homogeneous gel structures of various mole ratios of total Al/(Si + Al) was 0.53 mole ratio of bonded Al/(Si + Al) in contradiction to 0.1 mole ratio of Al/(Si + Al) achieved by traditional melting process of glass.
TI - Gelation of Aluminosilicate Systems Under Different Chemical Conditions
JF - Journal of Sol-Gel Science and Technology
DO - 10.1023/A:1011214116008
DA - 2004-10-07
UR - https://www.deepdyve.com/lp/springer-journals/gelation-of-aluminosilicate-systems-under-different-chemical-bMdxA0YKm5
SP - 147
EP - 156
VL - 21
IS - 3
DP - DeepDyve
ER -