Drop spreading on superhydrophilic microdecorated surface

Title
Drop spreading on superhydrophilic microdecorated surface
Authors
김성진문명운이광렬장영수이대영김호영
Keywords
Micro&nano-structure; Drop spreading; Dynamic; Hydrophilic
Issue Date
2010-03
Publisher
Joint International symposia on 3rd Micro and Nano Technology
Abstract
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.
URI
http://pubs.kist.re.kr/handle/201004/38736
Appears in Collections:
KIST Publication > Conference Paper
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