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为了了解玻璃基底上平衡态液滴接触角特性,采用实验和理论相结合的方法分析了玻璃基底表面水滴平衡时应满足的热力学条件,得到了液滴汽-液界面形状以及平衡态接触角大小。分析发现,玻璃基底上平衡态液滴接触角是与三相接触线压力相关的热力学参数,当三相接触线曲率一定时,平衡态液滴接触角随三相接触线处压比的增加而增大.同时,考虑到固-液界面吸附特性,根据平衡态时系统亥姆霍兹自由能最小这一热力学判据可以预测出液滴平衡接触角大小,结果和实验值吻合。
In order to understand the characteristics of the contact angle of the equilibrated droplets on the glass substrate, the thermodynamic conditions that should be satisfied in the water droplet equilibrium on the glass substrate surface were analyzed by the combination of experimental and theoretical methods. The shape of the droplet vapor-liquid interface and the equilibrium contact angle . It is found that the contact angle of the equilibrium droplet on the glass substrate is the thermodynamic parameter related to the pressure of the three-phase contact line. When the curvature of the three-phase contact line is constant, the contact angle of the equilibrium droplet increases with the pressure ratio at the three-phase contact line In the meantime, taking into account the adsorption characteristics of the solid-liquid interface, the equilibrium contact angle of the droplet can be predicted according to the thermodynamic criterion of minimum Helmholtz free energy in the equilibrium state, and the result agrees well with the experimental data.