Ratcheting motion of liquid drops on gradient surfaces.

@article{Daniel2004RatchetingMO,
  title={Ratcheting motion of liquid drops on gradient surfaces.},
  author={Susan Daniel and Sanjoy Sircar and Jill Gliem and Manoj K Chaudhury},
  journal={Langmuir : the ACS journal of surfaces and colloids},
  year={2004},
  volume={20 10},
  pages={4085-92}
}
The motions of liquid drops of various surface tensions and viscosities were investigated on a solid substrate possessing a gradient of wettability. A drop of any size moves spontaneously on such a surface when the contact angle hysteresis is negligible; but it has to be larger than a critical size in order to move on a hysteretic surface. The hysteresis can, however, be reduced or eliminated with vibration that allows the drop to sample various metastable states, thereby setting it to the path… CONTINUE READING
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