Dual length scales: Chocolate (Cu) chip cookies

Nature often seems to use more than one length-scale of roughness - the Lotus leaf has small bumps on large bumps. Using photolithographic techniques and electrodeposition, it is possible to overlay large scale textured surfaces with small-scale roughness and see whether surfaces with multiple length scales shed water more effectively. In one experiment a "chocolate" chip cookie pattern was created using copper. Read more about the process in the publication below.

Publication

Additional Reading