液滴运动的几何门控定向控制

中文摘要 AI 辅助

我们探索了在弹性体基底（如聚二甲基硅氧烷，PDMS）上诱导水滴运动的新方法。我们的方法建立在已知现象之上，即当这些基底被硅油溶胀时，水滴能够轻易地在上面移动。虽然在PDMS薄膜上设计浅的开放通道和陷阱，通过沿两个正交方向倾斜基底来控制液滴轨迹是一种简单的方法，但该方法不适合同时操控多个液滴。为解决这一局限，我们引入了两种新方法。第一种方法利用平凹PDMS平台，其曲率半径显著大于液滴尺寸及其平移距离。当系统构型改变时，该弯曲基底能持续引导液滴沿弯曲测地线运动。第二种方法在PDMS上集成二极管式门控。这些门控通过在交联前将薄刚性板嵌入弹性体，随后在硅油中溶胀，在平坦或平凹PDMS薄膜上形成S形台阶，从而将液滴运动限制在单一方向。最后，我们展示了如何将这两种策略结合，以实现对单个和多个液滴的各种定向运动。

英文摘要

We explore new methods for inducing the movement of water droplets on elastomeric substrates, such as polydimethylsiloxane (PDMS). Our approach builds upon the well-known phenomenon that water droplets move easily across these substrates when swelled w,ith silicone oil. While designing shallow open channels and traps on a PDMS film offers a simple way to control a droplet's trajectory by tilting the substrate in two orthogonal directions, this method is poorly suited for manipulating multiple droplets simultaneously. To address this limitation, we introduce two new methods. The first method utilizes a plano-concave PDMS platform with a radius of curvature significantly larger than the size of the droplet and its translation distance. When the system's configuration is altered, this curved substrate consistently guides the droplet along a curved geodesic. The second method incorporates diode-like gates on the PDMS. These gates are created on either flat or plano-concave PDMS films by embedding thin, rigid plates into the elastomer prior to crosslinking, followed by swelling in silicone oil. This process generates sigmoidal steps that restrict droplet motion to a single direction. Finally, we demonstrate how combining these two strategies enables various forms of directed motion for both single and multiple droplets.

发表机构

• Lehigh University（利哈伊大学）

机构由 AI 辅助整理，请以论文原文为准。