An allegedly anomalous behaviour of aqueous dispersions of silica has attracted continually a great attention from Thomas Graham’s time. However, even recent coagulation experiments with apparently well-defined colloidal silica spheres are not interpretable when their surface is assumed intact in contact with water. In fact, various explanations such as a hairy layer of polysilicic acid and the hydration layer on the silica surface are well-known but not proven accompaniments of the hydration process. It has been previously suggested (Skvarla, J., Langmuir, 29:8809–8824, 2013 ) basing on a combination of the soft-sphere model of colloids, surface charge data, and the Flory-Donnan theory that a swellable polyelectrolyte gel-like layer develops inherently on the surface of highly charged silica in aquoeus KCl solutions. Here, we support this rationalization by extending the coagulation analysis. Results are also discussed from the standpoint of approaches associated with the traditional and extended DLVO theories.

中文翻译：

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二氧化硅水溶胶凝结行为的统一分析——当胶体和聚合物科学相遇时

据称，二氧化硅水分散体的异常行为一直引起托马斯·格雷厄姆时代的极大关注。然而，当它们的表面被假定与水接触时完好无损时，即使是最近使用明显定义明确的胶体二氧化硅球体的凝结实验也无法解释。事实上，诸如聚硅酸的毛状层和二氧化硅表面上的水化层等各种解释是众所周知的，但并未证实水化过程的伴随物。基于胶体的软球模型、表面电荷数据和 Flory-Donnan 理论，先前有人建议 (Skvarla, J., Langmuir, 29:8809–8824, 2013)在 KCl 水溶液中，在高电荷二氧化硅表面上固有地形成类似层。这里，我们通过扩展凝血分析来支持这种合理化。还从与传统和扩展 DLVO 理论相关的方法的角度讨论了结果。