| Summary: | 碩士 === 國立臺灣大學 === 化學工程學研究所 === 90 === 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 stripes, the contact angle of the liquid drop would be determined by the three-phase contact line normal or parallel to the stripes. The three-phase contact line would be contorted or smooth along different directions of the stripe. The microcontact printing was applied to fabricate alternating and parallel hydrophobic and hydrophilic stripes of thiol self-assembled monolayers on gold surface . We found that the aggregation of silane molecules in the solvent would affect the quality of contact inking procedure , especially the stripe width is small. We also explored the effect of stripe width on the contact angle. It was found that when the three-phase contact line is parallel to the stripes, the contact angle is independent of the stripe width. On the other when the three-phase contact line is perpendicular to the stripes, the contact angle would be affected by the stripes width.
Key words: self assembled monolayer、microcontact printing 、three-phase contact line
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