Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Microscopic structure of electrowetting-driven transitions on
  superhydrophobic surfaces   We investigate directly at the microscale the morphology of the
electrowetting induced transition between the Cassie-Baxter and Wenzel states
for a water droplet on a superhydrophobic surface. Our experiments demonstrate
that the transition originates in a very narrow annular region near the
macroscopic contact line, which is first invaded by water and causes a thin
film of air to be entrapped below. At high applied voltages, a growing fraction
of microscopic air-pockets collapse, resulting in a partialWenzel state.
Modulations in the intensity of the light reflected from individual
micro-menisci clarify that the local contact angles near the filling transition
are close to the usual advancing values for contact lines on smooth surfaces.

11
The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
7
The categories of this paper are: hep-th
35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
13
The categories of this paper are: quant-ph
14
The categories of this paper are: math-ph
17
The categories of this paper are: q-fin
8
The categories of this paper are: hep-ex
30
The categories of this paper are: q-alg
23
The categories of this paper are: solv-int
10
The categories of this paper are: q-bio
25
The categories of this paper are: patt-sol
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con