| Summary: | 碩士 === 國立清華大學 === 工程與系統科學系 === 95 === Reversible electrowetting on super-hydrophobic lotus leaf mimetic surface has been demonstrated in this research.
Well-designed patterned thick photo resist AZ-9260 is for micro structures. Therefore, a thin parylene film is deposited and etched to form nano structures on micro structures. The hydrophobicity and hysteresis of the binary structures are about 160° and 3° by contact angle. However, if there are only micro or nano structures, the hysteresis of the hydrophobic surface will increase tremendously.
By removing the cover electrode from traditional EWOD, the chip has more flexibility on designing and sensing. This EWOD chip successfully demonstrates the droplet (about 7 μl) movement by applying a voltage 38 V.
In this research, the super-hydrophobic lotus leaf mimetic structures are substituted for Teflon on EWOD chip. The structures have three energy barriers, so the surface can keep small hysteresis and water contact angle is reversible after applying a specific voltage. The maximum contact angle difference is about 14° with a voltage 160 V. However, the reversibility of the surface will be failed if a voltage over 160 V is applied.
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