Festoon instabilities of slightly volatile liquids during spreading

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Abstract
We have observed two stages in the spreading of large, flat, droplets of silicone oils (degree of polymerization N < 20) deposited on bare silicon wafers : i) at first, the drop contour is perfectly circular and the drop radius R increases with time as R∼t0.15, ii) below a critical thickness hc, a rim is formed at the contact line and the contour develops spectacular festoons. At the same time, the spreading speeds up and the radius increases as R∼t1/3. We have interpreted these results in terms of Marangoni driven instabilities induced by the surface tension gradient generated at the drop edge by liquid evaporation

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