Effects of quaternary ammonium chlorides on the surface properties of precipitated silicas

In these studies, highly dispersed silicas were obtained. Studies on the su rface modification of hydrated silicas using cationic surfactants are descr ibed. The best modifiers were judged to be those that induced a change in t he silica surface from hydrophilic to hydrophobic. Physicochemical studies on the morphology and microstructure of the silicas obtained were carried o ut using transmission electron microscopy (TEM). Zeta potential, polydisper sity, particle size and the tendency to form primary and secondary agglomer ate structures were also determined.