親水／疎水パターンによる自律的液滴移動に関する研究

概要

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This present paper is intended to show some experiments and discussion about autonomously motion of droplet on hydrophilic/hydrophobic-patterned substrate. An array of triangular PTFE works as specific pattern to have gradient wettability on a glass substrate. Water micro droplet can autonomously moved from hydrophobic region to hydrophilic region along the pattern. Both of pattern geometry and droplet size become the difference between success and failure of the droplet motion. Contact line geometries of water droplet allow us to estimate driving force and necessary condition for autonomously droplet motion. The obtained value is well consistent with the experimental results. The authors also apply multi-step motion by sandwiching in droplet between two patterned substrates. Another substrate changes in direction of droplet after initial motion on a substrate. The droplet position can be controlled with mm-scale resolution.
公益社団法人精密工学会の論文