• Role of dopant cations in the gelation behaviour of silica sols

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      https://www.ias.ac.in/article/fulltext/boms/017/06/0999-1004

    • Keywords

       

      Silica sol; sol-gel transition; dopant cations

    • Abstract

       

      Gelation times of tetraethyl orthosilicate-derived sols containing selected di- to tetravalent cations as dopants were noted at different temperatures (15°–50°C). An analysis of these data, in conjunction with relevant published information, led to the tentative conclusions that (i) unhydrolyzed cations in bare form linked negatively charged silicate polymers in sols, thereby accelerating gelation and (ii) hydrolyzed cations retarded the process by offering molecular size-related hindrance and competition for the available water for hydrolysis.

    • Author Affiliations

       

      A Patra1 D Ganguli1

      1. Sol-Gel Laboratory, Central Glass & Ceramic Research Institute, Calcutta - 700 032, India
    • Dates

       
  • Bulletin of Materials Science | News

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