The Study of the Line Tension at a Model Heterogeneous Surface Consisting of Hydrophobic and Hydrophilic Strips
Date Issued
2004
Date
2004
Author(s)
Chen, Young-Zih
DOI
zh-TW
Abstract
Abstract
If a liquid drop is placed on a solid surface, the contact angle would be affected by the surface energy. If a liquid drop is placed on a specific surface consisting of alternating and parallel hydrophobic and hydrophilic strip, the contact angle of the liquid drop would be determined by the three-phase contact line normal or parallel to the strip . the three-phase contact line would be contorted or smooth along different directions of the strips. The microcontact printing was applied to fabricate alternating and parallel hydrophobic and hydrophilic of thiol self-assembled monolayers on gold surface. We also explored the effect of strip width on the contact angle. Finally, modified Cassie equation was applied to calculate the line tension value when three-phase contact line is perpendicular to the strips. It is found that the value of line tension are of the order of 10-6J/m for water surface tension.
Key word : self-assembled monolayers、microcontact printing、three-phase contact line、line tension
Subjects
自聚性單分子膜
三相線
前進角
線張力
微觸印刷
self-assembled monolayers
line tension
microcontact printing
three-phase contact line
Type
thesis
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ntu-93-R91524080-1.pdf
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