The movie shows the dynamics of a drop composed of 2000 water molecules (red and white spheres) on top of a glass slab (yellow and magenta in blue box). The starting configuration corresponds to a water disc and the system was computer-simulated for 2 nanoseconds. The water contact angle (WCA), the angle between the tangent of the water droplet and the solid surface, characterize the affinity between water and glass. The WCA value can be reproduced by computer simulations.
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http://www.ks.uiuc.edu/Research/silica/
The movie was made for demonstration purposes, so the contact angle wasn't measured.
See Eduardo R. Cruz-Chu, Aleksei Aksimentiev, and Klaus Schulten. Water-silica force field for simulating nanodevices. Journal of Physical Chemistry B, 110:21497-21508, 2006, for more on this subject including contact angle.
tcbguiuc 2 years ago
how much the contact angle was?
checkmatedeepblue 2 years ago