Drop spreading on complex surfaces

Stapelbroek, Bram (2013) Drop spreading on complex surfaces.

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Abstract:In this thesis we study how the initial stage of drop spreading is in uenced by surface properties. For smooth, homogeneous surfaces the radius of the wetted area was pre- viously found to grow as the square root of time. We report that there is no in uence on this 1 2 power-law by the introduction of micron-sized pillars, chemical heterogene- ity or by viscoelasticity of the surface. However at later times, a deviation from the 1 2 power-law is observed. Despite the different types of complexities of the substrates, our results show that this deviation is universal and that data for different substrates can be collapsed when the cross-over times are synchronized. The cross-over time is found to depend on the equilibrium contact angle only, in contrast to previous work that suggested a different spreading exponent for each contact angle.
Item Type:Essay (Master)
Faculty:TNW: Science and Technology
Subject:33 physics
Programme:Applied Physics MSc (60436)
Link to this item:http://purl.utwente.nl/essays/63385
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