  The spreading dynamics of Newtonian liquids have been extensively studied in
hydrophilic and hydrophobic surfaces and its behavior has been extensively
explored over the last years. However, drop impact of Non-Newtonian liquids
still needs further study. Luu and Forterre (J. Fluid Mech., 632, 2009)
successfully found scaling laws for yield-stress fluids on hydrophilic
surfaces. They also uncovered interesting and yet unexplained regimes when the
impact was performed on a superhydrophobic surface. In this work, we perform
drop impact experiments on micro-patterned surfaces with two types of
non-Newtonian liquids: one showing shear-thickening behavior and another one
showing shear-thinning. Our results show that a typical shear-thickening liquid
as cornstarch -at least a the relatively low concentration of 30\%w/w- spreads
according to the scaling laws of Newtonian liquids, whereas visco-elastic
liquids as Carbopol behave as predicted by Luu and Forterre for impact on
hydrophilic surfaces, but show different scaling laws when they impact on
superhydrophobic surfaces.
