Conclusions
Dealing with n-alcohols where n = 1,2,…,5 the Marangoni
forces acting on the drop dominate the dissolution and overpower
the cohesive forces between the molecules. This results in the
drop being completely dissolved within a fraction of a second.
For n = 10 and higher the molecule-to-molecule bonds of the drop
mask any Marangoni forces present. It is in the intermediate range
where n = 6 – 9 that the cohesive and Marangoni forces are
dually expressed in the visible dissolution of the drops. It is
in this range of n-alcohols that allow the drop to remain whole
long enough for Marangoni forces to be observed and dissolve enough
for there to be reasonable surface tension gradients. This is
where the dissolution takes on such unique observable characteristics
as the boomerang breakup, the divorce, and fingering.
|