Skip to main content
SpringerLink
Log in

A calorimetric study of the ultrasound-stimulated hydrolysis of solventless TEOS-water mixtures

  • Published:
Journal of Sol-Gel Science and Technology Aims and scope Submit manuscript

Abstract

The kinetics of ultrasound-stimulated and HCl-catalyzed hydrolysis of solventless TEOS-water mixtures was studied as a function of temperature ranging from 10°C up to 65°C by means of flux calorimetry measurements. A specially designed device was utilized for this purpose. The exothermic peak arising few minutes after sonication began has been attributed mainly to the hydrolysis reaction. The overall hydrolysis process, which was measured through the irradiation time up to the hydrolysis peak, was found to be thermally activated, with an apparent activation energy ΔE=36.4 kJ/mol. The alcohol produced at the early hydrolysis due to sonication seems to further enhance the reaction, via a parallel autocatalytic path, which is controlled by a faster pseudo second order rate constant (k′). Our modeling yielded k′=6.3×10−2M−1min−1 at 20°C, which is in a reasonable agreement with the literature, and an activation energy ΔE=40.4 kJ/mol for the specific process of hydrolysis in presence of alcohol.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

References

  1. C.J. Brinker, J. Non-Cryst. Solids, 100, 31 (1988).

    Google Scholar 

  2. S.Y. Chang and T.A. Ring, J. Non-Cryst. Solids, 147&148, 56 (1992).

    Google Scholar 

  3. R.A. Assink and B.D. Kay, J. Non-Cryst. Solids, 99, 359 (1988).

    Google Scholar 

  4. F. Brunet and B. Cabane, J. Non-Cryst. Solids, 163, 211 (1993).

    Google Scholar 

  5. W.G. Klemperer and S.D. Ramamurthi, J. Non-Cryst. Solid, 121, 16 (1990).

    Google Scholar 

  6. T. Lours, J. Zarzycki, A. Craievich, D.I. Dos Santos, and M. Aegerter, J. Non-Cryst. Solids, 100, 207 (1988).

    Google Scholar 

  7. G. Orcel and L. Hench, J. Non-Cryst. Solids, 79, 177 (1986)

    Google Scholar 

  8. M. Tarasevich, Am. Ceram. Bull., 63, 500 (1984).

    Google Scholar 

  9. M. Ramirez-Del-Solar, N. De La Rosa-Fox, L. Esquivias, and J. Zarzicky, J. Non-Cryst. Solids, 121, 40 (1990).

    Google Scholar 

  10. M. Atik, PhD Thesis, Montpellier University (1990).

  11. R. Aelion, A. Loebel, and F. Eirich, J. Am. Chem. Society, 72(12), 5705 (1950).

    Google Scholar 

  12. J.M. García-Ruiz, A. Santos, and E.J. Alfaro, J. Cryst. Growth, 84, 555 (1987).

    Google Scholar 

Download references

Author information

Authors and Affiliations

  1. Departamento de Física, Universidade Estadual Paulista, UNESP, Campus de Rio Claro, Cx.P. 178, 13500-970, Rio Claro (SP), Brazil

    D. A. Donatti & D. R. Vollet

Authors
  1. D. A. Donatti
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. D. R. Vollet
    View author publications

    You can also search for this author in PubMed Google Scholar

Rights and permissions

Reprints and permissions

About this article

Cite this article

Donatti, D.A., Vollet, D.R. A calorimetric study of the ultrasound-stimulated hydrolysis of solventless TEOS-water mixtures. J Sol-Gel Sci Technol 4, 99–105 (1995). https://doi.org/10.1007/BF00491676

Download citation

  • Received:

  • Accepted:

  • Issue Date:

  • DOI: https://doi.org/10.1007/BF00491676

Keywords

Search

Navigation