期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 356, 期 1, 页码 37-45出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2010.12.085
关键词
Water glass; Gelation; Colloidal silica; Dynamic light scattering; Si-29 NMR
资金
- Swedish National Graduate School in Materials Science
- Foundation for Strategic Research
- Swedish Research Council
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, Si-29-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. (C) 2011 Elsevier Inc. All rights reserved.
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