The development of realistic multiphase nanoporous silica gel interfacial models provides insights into understanding glass-dissolution mechanisms, especially the residual dissolution rate and long-term corrosion behaviors of multicomponent borosilicate glasses. Silica gels have remained the major material used as a stationary phase for TLC. Dissolved silica clusters in water experienced an initial sharp increase and then reached equilibrium concentration at longer time. Higher network connectivity of the silica gel can regulate transport of ions and plays the role of passivation. It was found that the gel region exhibited an increase in Si–O network connectivity with time, consistent with recent NMR results, due to cross-linking of siloxane bonds in the gel and the dissolution of less connected groups into the water region. Fractal structures do not have a constant value for density it gradually. The short- and medium-range structures of the gel and the interfaces as well as water diffusion and silica dissolution behaviors were studied in detail. FRACTAL BEHAVIOR IN SILICA GEL CHEMISTRY In fractal theory a structure can be. Interfacial models that consist of bulk silica, nanoporous hydrated silica gel, and bulk water were constructed and their evolution was studied to understand the water–glass reaction fronts using the Reactive Force Field (ReaxFF)-based molecular dynamics simulations. Herein, a coupling between a grand canonical Monte Carlo and the parallel tempering methods is developed. Nanoporous silica gel structures and associated interfaces formed on the surface of silicate and borosilicate glasses play an important role in understanding the dissolution mechanisms of these glasses. The formation and ageing of gels is a complex issue that has to be resolved to investigate manifold synthetic materials, among them: porous materials such as cement, high-quality glass fiber, and geomaterials for radioactive waste sealing.

Silica gel structure