Preparation of sodium borosilicates using sodium silicate and boric acid

OBUT A., Girgin I.

JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY, vol.39, no.2, pp.79-83, 2006 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 39 Issue: 2
  • Publication Date: 2006
  • Doi Number: 10.1007/s10971-006-8974-6
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.79-83
  • Keywords: aqueous sodium silicate, boric acid, sodium borosilicate, sol-gel synthesis, SOL-GEL, GLASSES, NA2O-B2O3-SIO2
  • Hacettepe University Affiliated: Yes


The gelling behaviour of an aqueous sodium silicate solution with boric acid was investigated for different initial compositions and solid sodium borosilicate samples were obtained by drying the gels at 100 degrees C, 225 degrees C and 450 degrees C. The chemical composition, dissolution, pH, loose-packed bulk density, B.E.T. surface area, moisture, size distribution and XRD/IR patterns of the sodium borosilicate particles were determined. The minimum gelling times were observed at pH values between 9-10 and although no gels were obtained using HCl at pH = 11, the silicate solution was gelled with boric acid suggesting borate ions promote the formation of siloxane network and behave as a crosslinking agent.