Reversing Gels and Water Soluble Colloids from Aminosiloxanes

T. Suratwala, K. Davidson, Z. Gardlund, D. Collins, D. R. Uhlmann

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


The unique sol/gel behavior of an organic/inorganic hybrid material synthesized from 3-aminopropyltriethoxysilane (3AS) and tetramethoxysilane (TMOS) is discussed and examined. The addition of H2O to a mixture of a basic (3AS) and an acidic (TMOS) alkoxide leads to rapid gel formation. This wet gel reverses to a sol upon heating which is attributed to the dissolution of siloxane bonds between the surfaces of colloidal particles in the gel. The reversed sol dries to an optically transparent solid which is water soluble. The water solubility and the stability of these colloidal particles are described by their aminopropyl/silanol surface and the electrostatic interactions between them using DLVO theory.

Original languageEnglish (US)
Pages (from-to)553-558
Number of pages6
JournalJournal of Sol-Gel Science and Technology
Issue number1-3
StatePublished - Jan 1998


  • 3-aminopropyltriethoxysilane
  • Colloids
  • DLVO theory
  • Reversible gel
  • Tetramethoxysilane
  • Water soluble silica

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • General Chemistry
  • Biomaterials
  • Condensed Matter Physics
  • Materials Chemistry


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