Drop spreading on superhydrophilic microdecorated surface
- Drop spreading on superhydrophilic microdecorated surface
- 김성진; 문명운; 이광렬; 장영수; 이대영; 김호영
- Micro&nano-structure; Drop spreading; Dynamic; Hydrophilic
- Issue Date
- Joint International symposia on 3rd Micro and Nano Technology
- It is well known that water drops spread almost perfectly on highly wettable smooth surfaces achieving
a contact angle of almost zero. When a hydrophilic surface has micro- and nano-textures, the water
drops also spread to form a thin liquid film. However, here we show that the dynamics of spreading on
micro/nanotextured hydrophilic surfaces are qualitatively different from those on smooth surfaces – the
spreading is no longer axisymmetric and the spreading rate is much enhanced exhibiting
“superhydrophilic” nature. We experimentally measure the spreading rate of water drops on
hydrophilic micropillar arrays with varying pillar heights and pitches. In addition to the enhanced
spreading velocity, we find two distinct spreading behaviors within an individual drop, i.e. bulk
spreading and precursor film propagation. Scaling laws are given for different types of spreading
behavior and compared with experiments.
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- KIST Publication > Conference Paper
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