Back-and-forth micromotion of aqueous droplets in a dc electric field
Back-and-forth micromotion of aqueous droplets in a dc electric field
复制标题
直流电场中水滴的来回微运动
DOI：
10.1103/physreve.88.042918
复制
发表时间：
2013
期刊：
影响因子：
--
通讯作者：
Masahiro Takinoue and Kenichi Yoshikawa
中科院分区：
文献类型：
--
作者：
Tomo Kurimura;Masatoshi Ichikawa;Masahiro Takinoue and Kenichi Yoshikawa
最近，有报道称，油相中的水滴在100V的恒定直流电压下表现出有节奏的来回运动。在这里，我们证明了通过缩小实验系统的尺寸，成功地将诱导这种振荡的阈值电压降低到10V量级。值得注意的是，随着尺寸的减小，阈值电场呈非线性标度关系减小。我们推导了一个简单的理论模型来解释阈值电压对系统尺寸的依赖关系。该模型方程揭示了附加噪声的独特效应，通过实际实验定性地将其定性地描述为一种相干共振。我们的结果将为微流体和微机械设备中微米级自换向电机和执行器的结构提供洞察力。
Recently, it was reported that an aqueous droplet in an oil phase exhibited rhythmic back-and-forth motion under stationary dc voltage on the order of 100 V. Here, we demonstrate that the threshold voltage for inducing such oscillation is successfully decreased to the order of 10 V through downsizing of the experimental system. Notably, the threshold electric field tends to decrease with a nonlinear scaling relationship accompanied by the downsizing. We derive a simple theoretical model to interpret the system size dependence of the threshold voltage. This model equation suggests the unique effect of additional noise, which is qualitatively characterized as a coherent resonance by an actual experiment as a kind of coherent resonance. Our result would provide insight into the construction of micrometer-sized self-commutating motors and actuators in microfluidic and micromechanical devices.