Concentration- and pH-dependence of highly alkaline sodium silicate solutions
Artikel i vetenskaplig tidskrift, 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

Författare

Jonas Nordström

Chalmers, Teknisk fysik, Kondenserade materiens fysik

Erik Nilsson

Chalmers, Kemi- och bioteknik, Teknisk ytkemi

Patrik Jarvoll Dae

Chalmers, Kemi- och bioteknik

Moheb Nayeri

Göteborgs universitet

Anders Palmqvist

Chalmers, Kemi- och bioteknik, Teknisk ytkemi

Johan Bergenholtz

Göteborgs universitet

Aleksandar Matic

Chalmers, Teknisk fysik, Kondenserade materiens fysik

Journal of Colloid and Interface Science

0021-9797 (ISSN)

Vol. 356 37-45

Ämneskategorier

Fysikalisk kemi

Fundament

Grundläggande vetenskaper

Styrkeområden

Materialvetenskap

DOI

10.1016/j.jcis.2010.12.085