Li Yufeng, Liu Junyan, Dong Jialong, Du Yufeng, Han Jinchun, Niu Yuanyuan
College of Electrical and Power Engineering, Taiyuan University of Technology, Taiyuan 030024, China.
SEDIN Engineering Co., Ltd., Taiyuan 030000, China.
Nanomaterials (Basel). 2024 Dec 9;14(23):1978. doi: 10.3390/nano14231978.
Although understanding the wetting behavior of solid surfaces is crucial for numerous engineering applications, the mechanisms driving the motion of Wenzel drops on rough surfaces remain incompletely clarified. In this study, the contact angle and contact angle hysteresis of Wenzel drops on superhydrophobic surfaces are investigated from a thermodynamic perspective. The free energy of the system is theoretically analyzed, thereby determining the equilibrium contact angle. Based on the sessile drop method, the relationship between the free energy barrier and the drop volume is calculated quantitatively, enabling the determination of advancing and receding contact angles under zero free energy barrier conditions. The theoretical calculations agree well with the experimental data. These findings enhance the understanding of the interfacial interactions between Wenzel drops and superhydrophobic surfaces.
尽管了解固体表面的润湿行为对于众多工程应用至关重要，但粗糙表面上文泽尔液滴运动的驱动机制仍未完全阐明。在本研究中，从热力学角度研究了超疏水表面上文泽尔液滴的接触角和接触角滞后。对系统的自由能进行了理论分析，从而确定平衡接触角。基于静置液滴法，定量计算了自由能垒与液滴体积之间的关系，从而能够确定零自由能垒条件下的前进接触角和后退接触角。理论计算与实验数据吻合良好。这些发现增进了对文泽尔液滴与超疏水表面之间界面相互作用的理解。
