Porous properties of polymeric Al2O3-SiO2 xerogels

Kiyoshi Okada, Jun Ichi Kaneda, Yoshikazu Kameshima, Atsuo Yasumori, Kenneth J D MacKenzie

Research output: Contribution to journalArticle

Abstract

Polymeric Al2O3-SiO2 xerogels with chemical compositions of 9.4, 25, 60 and 80 mol% Al2O3 were prepared by a sol-gel method and their porous properties were examined by N2 gas adsorption. Calculated amounts of aluminium nitrate nonahydrate (ANN) and tetraethylorthosilicate (TEOS) were dissolved in ethanol at a concentration of ANN+TEOS=0.3 mol/l with varying amount of added H2O, and hydrolyzed at 60°C for 1 month. The resulting wet gels were dried at 110°C then calcined at 300°C to remove residual nitrates and organic matter. The specific surface areas of the four xerogels changed greatly with H2O/TEOS but the relation was different in each xerogel. The pores in all these xerogels were less than 2 nm in radius and were thus very different from colloidal xerogels, i.e. they can be tuned between 1 and 30 nm by changing the preparation conditions. The differences in pore sizes are caused by the difference in the pH of the solution and also by the sedimentation conditions which form agglomerated structures.

Original languageEnglish
Pages (from-to)1945-1948
Number of pages4
JournalKey Engineering Materials
Issue number213 PART 3
Publication statusPublished - 2001
Externally publishedYes

    Fingerprint

Keywords

  • Alumina-silica gel
  • Polymeric gel
  • Porous properties
  • Water/silica ratio

ASJC Scopus subject areas

  • Ceramics and Composites
  • Chemical Engineering (miscellaneous)

Cite this

Okada, K., Kaneda, J. I., Kameshima, Y., Yasumori, A., & MacKenzie, K. J. D. (2001). Porous properties of polymeric Al2O3-SiO2 xerogels. Key Engineering Materials, (213 PART 3), 1945-1948.