Department of Applied Physics, Chalmers University of Technology, Gothenburg, Sweden.
J Colloid Interface Sci. 2011 Apr 1;356(1):37-45. doi: 10.1016/j.jcis.2010.12.085. Epub 2011 Jan 5.
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, (29)Si-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.
通过 pH 值的变化和通过蒸发增加浓度来使水玻璃不稳定。这两种方法都产生了光学透明、高粘度、均相的溶液。我们使用动态光散射、（29）硅核磁共振波谱、粘度测量和红外光谱研究了两种方法的溶液结构和动力学。我们发现这两种方法从根本上是不同的。增加硅酸钠体系的浓度显然不会改变二氧化硅的形态。降低 pH 值会导致缩合反应，从而改变二氧化硅的形态。
