Concentration- and pH-dependence of highly alkaline sodium silicate solutions
Journal article, 2011

In this study two routes for the gelation of water glass have been investigated; the destabilization by a change in pH and by an increase in concentration through evaporation. Both methods produce optically transparent, highly viscous, homogeneous solutions. The structure and dynamics of the solutions along the two routes have been investigated with Dynamic Light Scattering, 29Si-Nuclear Magnetic Resonance spectroscopy, viscosity measurements and infrared spectroscopy. We find that the two routes are fundamentally different. Increasing the concentration of the sodium silicate system leaves the silica speciation apparently unchanged. Lowering the pH leads to condensation reactions, thus a change in the silica speciation.

Gelation

Dynamic light scattering

29Si NMR

Water glass

Colloidal silica

Author

Jonas Nordström

Chalmers, Applied Physics, Condensed Matter Physics

Erik Nilsson

Chalmers, Chemical and Biological Engineering, Applied Surface Chemistry

Patrik Jarvoll Dae

Chalmers, Chemical and Biological Engineering

Moheb Nayeri

University of Gothenburg

Anders Palmqvist

Chalmers, Chemical and Biological Engineering, Applied Surface Chemistry

Johan Bergenholtz

University of Gothenburg

Aleksandar Matic

Chalmers, Applied Physics, Condensed Matter Physics

Journal of Colloid and Interface Science

0021-9797 (ISSN)

Vol. 356 1 37-45

Subject Categories

Physical Chemistry

Roots

Basic sciences

Areas of Advance

Materials Science

DOI

10.1016/j.jcis.2010.12.085

More information

Created

10/7/2017