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Studies of mechanism of silica polymerization reactions in the combination of silica sol and potassium sodium waterglass via isothermal heat conduction microcalorimetry

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Abstract

Isothermal heat conduction microcalorimetry was adopted as a novel characterization method to investigate the polymerization processes of silica when the combination of silica sol and potassium sodium silicate was stirred at 25.0, 35.0, and 45.0 °C. Thermodynamic and kinetic parameters were simultaneously obtained. The enthalpy change was greater at each higher temperature. The reaction orders (m, n) instantaneously varied, up and down in an alternate manner. At 25.0, 35.0, and 45.0 °C, the rate constants were different; the maximum rate constant occurred at 25.0 °C. These phenomena reflect a two-stage oligomeric mechanism of silica monomers. The measurements of particle size showed the complex chemical composition of aqueous silicates, which can be qualitatively designated by the particle size distribution in two parts. The results further indicate that the colloidal particles in the mixed silica sol and silicates first dissolved. Then the “active” silica in the silicates redeposited to make a distinct particle size distribution influenced by K+ and Na+ ions as well as by temperature.

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Abbreviations

M :

The molar ratio of silica to alkali metal oxide in silicates

Q T :

Total enthalpy change for a mixing reaction when it has gone to completion (J)

ΔH :

Changes in enthalpy (kJ mol−1)

A mol :

The initial number of moles of CH83–125 silica sol (mol)

B mol :

The initial number of moles of potassium sodium silicate (mol)

[A]0 :

The initial molar concentration of CH83–125 silica sol (mol dm−3)

[B]0 :

The initial molar concentration of potassium sodium silicate (mol dm−3)

V :

The total volume of CH83–125 silica sol and potassium sodium silicate (dm3)

Φ:

Heat flow (mW)

q :

Heat output (J)

k :

Rate constant ((mol dm−3)1−m−n s−1)

m :

The reaction order of CH83–125 silica sol

n :

The reaction order of potassium sodium silicate

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant No. 50673080).

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  1. School of Materials Science and Engineering, Wuhan University of Technology, 430070, Wuhan, People’s Republic of China

    Hebao Tian, Chaocan Zhang, Lili Wu & Yanjun Chen

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  1. Hebao Tian
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  2. Chaocan Zhang
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Correspondence to Chaocan Zhang.

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Tian, H., Zhang, C., Wu, L. et al. Studies of mechanism of silica polymerization reactions in the combination of silica sol and potassium sodium waterglass via isothermal heat conduction microcalorimetry. J Therm Anal Calorim 101, 959–964 (2010). https://doi.org/10.1007/s10973-010-0697-9

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  • DOI: https://doi.org/10.1007/s10973-010-0697-9

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