Jones, TB Fowler, JD Chang, YS Kim, CJ 2024-01-21T08:11:30Z 2024-01-21T08:11:30Z 2021-09-03 2003-09-02 0743-7463 https://pubs.kist.re.kr/handle/201004/138238 Electrowetting and dielectrophoretic actuation are potentially important microfluidic mechanisms for the transport, dispensing, and manipulation of liquid using simple electrode structures patterned on a substrate. These two mechanisms are, respectively, the low- and high-frequency limits of the electromechanical response of an aqueous liquid to an electric field. The Maxwell stress tensor and an RC circuit model are used to develop a simple predictive model for these electromechanics. The model is tested by measuring electric-field-induced pressure changes within an aqueous droplet trapped between two parallel, disk-shaped electrodes immersed in a bath of immiscible, insulating oil. The experiment is an adaptation of Quincke's original bubble method for measuring the dielectric constant of a liquid. For AC voltages lower than similar to100 V-rms, the pressure data largely conform to the square-law predictions of the model. At higher voltages, this square-law behavior is no longer evident, a result consistent with the well-known contact angle saturation effect. Pressure data obtained with DC electric fields are not consistent with either the lowest frequency data (10 Hz) or with the model. English AMER CHEMICAL SOC WATER FILMS ACTUATION FIELDS Frequency-based relationship of electrowetting and dielectrophoretic liquid microactuation Article 10.1021/la0347511 1 LANGMUIR, v.19, no.18, pp.7646 - 7651 LANGMUIR 19 18 7646 7651 scie scopus 000185086500075 2-s2.0-0141830020 Chemistry, Multidisciplinary Chemistry, Physical Materials Science, Multidisciplinary Chemistry Materials Science Article WATER FILMS ACTUATION FIELDS electrowetting