Thermochemical control of oil droplet motion on a solid substrate

Song, Chaeyeon; Kim, Kipom; Lee, Kyuyong; Pak, Hyuk Kyu
August 2008
Applied Physics Letters;8/25/2008, Vol. 93 Issue 8, p084102
Academic Journal
Through the thermochemical control of a liquid droplet on a solid substrate, we investigated the motion of the droplet and the underlying mechanism. Depending on the contact angle of the running droplet on the substrate with a chemical gradient coating, we observed two different behaviors for the droplet under local laser heating: reversing for a contact angle larger than a critical value (∼90°) and passing for a smaller value. The motion at the laser heating position was found to be closely related to the contact angle change, indicating that capillary flow plays an important role in the thermally induced motion of the droplet.


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