Surface modification to produce hydrophobic nano-silica particles using sodium dodecyl sulfate as a modifier

Nano silica particle was modified to produce hydrophobic surface with contact angle of 107° using the water soluble SDS as a modifier through a new route. The grafted density reached 1.82-2 nm. Brønsted acid sites supply proton to react with SDS via generating carbocation, forming a Si-O-C structure.