Movies of water in model pores
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generated with VMD 1.8.1
Hydrogen bonds are drawn with a geometric criterion: 
 
     Given an atom D with a hydrogen H bonded to it and an atom
     A with no hydrogen bonded to it, a hydrogen bond exists between
     A and H iff the distance ||D-A|| < dist and the angle D-H-A < ang,
     where ang and dist are user defined.

I used:   Angle: 30 deg, dist: 3.9 A

I also use a moving average over positions over 4 frames to smooth out
movements. Thus it's not too wiggly but you don't see any real rotations
and the water molecules sometimes distort. 

file                  radius/nm   polarity   approx time
--------------------------------------------------------
0R055.mpg             0.55        non-polar  1.5 ns
D4R015.mpg            0.15        4 dipoles  3.5 ns
D4R015_short.mpg      0.15        4 dipoles  0.5 ns
D4R015surf.mpg        0.15        4 dipoles  2 ns 
D4R015surfbig.mpeg    0.15        4 dipole   2 ns (high res)
                    (with pore surface, red=-0.35e, blue=+0.35e)