Document Detail


Driving Droplet by Scale Effect on Microstructured Hydrophobic Surfaces.
MedLine Citation:
PMID:  23140387     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
A new type of water droplet transportation mechanism on microstructured hydrophobic surface is proposed and investigated experimentally and theoretically - water droplet could be driven by scale effect under disturbance and vibration, which is different from the traditional contact angle-gradient based method. Scale-gradient microstructured hydrophobic surface is fabricated in which the area fraction is kept constant, but the scales of the micro-pillars are monotonic changed. When additional water or horizontal vibration is applied, the original water droplet could move unidirectionally to the direction from the small scale to the large scale. A new model with line tension energy developed very recently could be used to explain these phenomena. When compared with the traditional contact angle-gradient smooth surface, it is also found that dynamic contact angle decreases with increasing the scale of the micro-pillars along the moving direction under disturbance. These new findings will deepen our understanding of the relationship between topology and dynamic wetting properties, and could be very helpful to design liquid droplet transportation device in microfluidic systems.
Authors:
Pengfei Hao; Cunjing Lv
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-11-11
Journal Detail:
Title:  Langmuir : the ACS journal of surfaces and colloids     Volume:  -     ISSN:  1520-5827     ISO Abbreviation:  Langmuir     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-11-12     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9882736     Medline TA:  Langmuir     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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