  The present study reports the formation of self-assembled droplet pattern on
the PDMS polymer coated over grooved side of DVD under saturated vapours of
alcohols. Comparison of the results with breath figures formed over
unconstrained side of DVD is made. Four different environments namely methanol,
ethanol, 2-propanol and n-butanol are used for the analysis. It is observed
that the pattern formation occurs with methanol and ethanol vapours and not
with 2-propanol and n-butanol. The difference is pattern formation with
different alcohols is attributed to the variation in chain length and the
presence of hydrophobic groups in alcohols, as given by Traube's rule. The
distortion of patterns over constrained surface is attributed to the depinning
of contact lines.
