During the cutting process, both the concave width e and the
height of the convex h were fixed to be 100 m. The width of
convex varies between experiments to investigate the effect of
micro-structured surface on surface hydrophobic properties which
means the tilt angle for micro-structured surface is 90◦. The
convex width was selected to be 50 m, 75 m, 100 m, 125 m,
150 m, 200 m respectively.