The addition of titania sol to talc particles changed their aspect ratio to more than double during wet mechanical delamination in a ball mill. The role of titania sol was suspected to initiate the cleavage by adsorbing preferentially on the periphery of the talc particles. The optimum dose of titania sol was 0.1 wt %, which resulted in an aspect ratio about 90 with particle thickness ca. 0.1 mu m.