科研之友
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摘要
We investigate experimentally the dynamics of a liquid drop that impacts on a solid surface whose wettability is patterned at the microscopic scale. The target surface is patterned such that hydrophilic (hydrophobic) microscale spokes radiate from, the center on a hydrophobic (hydrophilic) background. Following the initial spreading stages, the drop recoils on the hydrophobic region while being arrested on the hydrophilic area, thereby resulting in a micropatterned liquid footprint. We also find that the fingering instability of the drop edge is affected by the wettability patterns in the initial spreading stages. The number of fingers depends on a combination of the impact Weber number and the number of spokes. We suggest that the present scheme of patterning liquid deposits at microscales could be exploited in various microfluidic applications.
- 出版日期2010-7
