After the nano-silica is dispersed into a liquid, the appearance varies from white milky to colorless and transparent according to different dispersion systems. From the detection point of view, the system with D90 <100nm is visually transparent in appearance. The dispersion of nanometers is a worldwide technical problem. The good news is that certain techniques have emerged that use certain nanoparticles to dissolve into a monodispersed state. One of them is nano silica.

Regarding the color of nano-silica, it seems that there are more than three factors. One of the varieties is, for example: our company's fumed silica, after using anti-agglomeration technology, is transparent in various systems. But the liquid method has the difference between light blue and colorless.
The difference between the nano-silica transparent dispersion and the silica sol is roughly as follows: the solvents of the two are different, the silica sol has only an aqueous system, and the nano-silica has a variety of solvent systems. In the same aqueous system, silica sol is more sensitive to the pH change of acid and alkali, and the change of pH will make it gel faster; while the transparent dispersion of nano-silica is not sensitive. Adjusted from 1-14, no gelation was found after standing for many days. Now the surface-modified silica sol can maintain stability when the pH value changes around '7', but if AL, Zn, Ca ions are introduced into the system, the silica sol gels quickly and the nano silica is dispersed The fluid remained stable. This is a chemical method to distinguish the two, which is more effective. There is another simple method. If the water-based sample is colorless and transparent, and does not have blue or blue-white opalescence, it can basically be determined as a transparent dispersion of nano-silica.
SAT NANO can supply nano silica silicon oxide dispersion for customers to do different research, if you have any enquiry, please feel free to contact us.