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Synergistic effects of the tip effect and electric adsorption on the enhanced electrowetting-on-dielectric performance of structured ZnO surfaces
CrystEngComm ( IF 2.6 ) Pub Date : 2020/02/27 , DOI: 10.1039/d0ce00047g Jian Wang 1, 2, 3, 4, 5 , Jianwen Zhang 1, 2, 3, 4, 5 , Xinyu Pei 1, 2, 3, 4, 5 , Shu Liu 1, 2, 3, 4, 5 , Fei Ning 1, 2, 3, 4, 5 , Yan Li 1, 2, 3, 4, 5 , Chengwei Wang 1, 2, 3, 4, 5
CrystEngComm ( IF 2.6 ) Pub Date : 2020/02/27 , DOI: 10.1039/d0ce00047g Jian Wang 1, 2, 3, 4, 5 , Jianwen Zhang 1, 2, 3, 4, 5 , Xinyu Pei 1, 2, 3, 4, 5 , Shu Liu 1, 2, 3, 4, 5 , Fei Ning 1, 2, 3, 4, 5 , Yan Li 1, 2, 3, 4, 5 , Chengwei Wang 1, 2, 3, 4, 5
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To improve the spreading ability of a water droplet on a structured surface, the tip effect is proposed to enhance the local electric field near the cone tip under the application of voltage, and further increases the horizontal force on the water droplet. Thus, a vertical-standing ZnO nanocone array was designed and prepared on a Zn substrate by a simple one-step hydrothermal method, and the cone tip was modulated from a spiculate nanocone to nanorod through adjusting the hydrothermal time and temperature. Experimentally, the electrowetting-on-dielectric (EWOD) responses of the prepared ZnO nanocone array were measured, and the contact angle (CA) modulation under the application of voltage below 30 V reached a value of 89° due to the synergistic effects of the tip effect and electric adsorption. Theoretically, the electric field distribution in the nanocone array was simulated by using the finite element method, and the nanocone array was optimized to enhance the local electric field near the nanocone tip and to suppress the wetting transition from the Cassie state to the Wenzel state. The work is very beneficial to the achievement of a spontaneous switchable EWOD with large CA modulation on the structured surface.
中文翻译：
尖端效应和电吸附对结构化ZnO表面增强的介电电润湿性能的协同效应
为了提高水滴在结构化表面上的扩散能力，提出了尖端效应以在施加电压的情况下增强圆锥形尖端附近的局部电场，并进一步增大对水滴的水平力。因此，通过简单的一步式水热法设计并制备了垂直放置的ZnO纳米锥阵列，并通过调节水热时间和温度将锥尖从针状纳米锥调制为纳米棒。实验上，测量了制备的ZnO纳米锥阵列的电介质上电润湿（EWOD）响应，并且由于30V以下的协同作用，在施加电压低于30 V时，接触角（CA）调制达到89°的值。尖端效应和电吸附。从理论上讲 利用有限元方法模拟了纳米锥阵列中的电场分布，并对纳米锥阵列进行了优化，以增强纳米锥尖端附近的局部电场，并抑制了从卡西态到温泽尔态的润湿转变。这项工作对于在结构化表面上实现具有大CA调制的自发可切换EWOD非常有益。
更新日期：2020-03-30
中文翻译：
尖端效应和电吸附对结构化ZnO表面增强的介电电润湿性能的协同效应
为了提高水滴在结构化表面上的扩散能力，提出了尖端效应以在施加电压的情况下增强圆锥形尖端附近的局部电场，并进一步增大对水滴的水平力。因此，通过简单的一步式水热法设计并制备了垂直放置的ZnO纳米锥阵列，并通过调节水热时间和温度将锥尖从针状纳米锥调制为纳米棒。实验上，测量了制备的ZnO纳米锥阵列的电介质上电润湿（EWOD）响应，并且由于30V以下的协同作用，在施加电压低于30 V时，接触角（CA）调制达到89°的值。尖端效应和电吸附。从理论上讲 利用有限元方法模拟了纳米锥阵列中的电场分布，并对纳米锥阵列进行了优化，以增强纳米锥尖端附近的局部电场，并抑制了从卡西态到温泽尔态的润湿转变。这项工作对于在结构化表面上实现具有大CA调制的自发可切换EWOD非常有益。
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