Dataset supporting journal publication 'Towards accurate evaluation of pressure-induced Cassie-to-Wenzel wetting transition on superhydrophobic surfaces'

We investigated the Cassie-to-Wenzel wetting transition on superhydrophobic surfaces by compressing a droplet between two interfaces, monitoring the applied force, and simultaneously capturing the droplet shape using backlit imaging. Superhydrophobic surfaces were fabricated by etching micropillars into a silicon substrate and applying a low-surface-energy monolayer coating via chemical vapor deposition. This dataset contains experimentally measured time-dependent forces and corresponding images. The data were acquired using a strain gauge load cell connected to a 24-bit data acquisition system and an optical camera with a macro lens. Droplet compression was controlled with a linear stage driven by a piezoelectric inertia drive. The measurements were conducted at the Faculty of Mechanical Engineering, University of Ljubljana, Slovenia, between August 28 and September 24, 2024. This dataset can be used to calculate the Laplace pressure within the droplet, thereby determining the force exerted by the droplet on the surface. These calculations can be compared with the experimentally measured forces, providing valuable insights into the wetting transition mechanism.本研究通过在两个界面间压缩液滴、监测施加的作用力，并同步利用背光成像捕捉液滴形貌，对超疏水表面上的卡西-文泽尔润湿转变（Cassie-to-Wenzel wetting transition）展开了系统探究。 实验所用超疏水表面通过在硅基底上蚀刻微柱，并借助化学气相沉积（chemical vapor deposition）涂覆低表面能单分子层涂层制备得到。 本数据集包含实验测得的随时间变化的作用力数据与对应图像。数据采集采用连接24位数据采集系统的应变式测力传感器，以及搭载微距镜头的光学相机完成。液滴压缩过程由压电惯性驱动的线性位移台控制。 实验于2024年8月28日至9月24日期间，在斯洛文尼亚卢布尔雅那大学机械工程学院开展。 该数据集可用于计算液滴内部的拉普拉斯压强（Laplace pressure），进而确定液滴施加于表面的作用力。通过将计算结果与实验测得的作用力进行对比，可为润湿转变机制的研究提供有价值的见解。