Synthesis of Hydrophilic and Hydrophobic High Surface Area Xerogels at pHs below Silica Iso-electric Point

V. C. Menon, S. Komarneni, M. Park, M. Schmücker, H. Schneider

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

The synthesis of hydrophilic and hydrophobia high surface area (up to 1087 m2/cc) silica xerogels at pHs below 2 is demonstrated in this work. High surface area xerogels exhibit extremely fine microstructural features and fast gelation times (less than one hour). Contrary to conventional generalization that xerogels synthesized at low pH are polymeric, it is demonstrated that particulate xerogels can also be synthesized at pHs below 2. These xerogels are synthesized by the addition of large amounts of NH4OH and have relatively lower surface areas. The particulate nature of these xerogels is indicated by their opacity and from their coarse microstructural features as observed by TEM.

Original languageEnglish (US)
Pages (from-to)7-16
Number of pages10
JournalJournal of Sol-Gel Science and Technology
Volume11
Issue number1
DOIs
StatePublished - Jan 1 1998

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Chemistry(all)
  • Biomaterials
  • Condensed Matter Physics
  • Materials Chemistry

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