2种液体间界面张力的动态测量

Dynamic measurement of the interfacial tension between two liquids

利用自制仪器对2种液体间界面张力进行动了动态测量,通过嵌套软件在计算机上实时记录测量过程中的电压值,避免了人工读数带来的实验测量误差,并绘制出相应的电压变化曲线.根据电压变化曲线对金属吊环在2种液体中的拉脱过程分4个阶段进行详细讨论,并通过受力分析建立了力平衡方程.以纯净水和硅油、纯净水和乙酸乙酯为样品,对其界面张力分别进行了实验测量.

The interfacial tension between two liquids was measured dynamically by self-made instrument.The voltage value was recorded by the embedded software on the computer.The experimental errors brought by the manual reading were avoided,and the corresponding voltage curve was drawn.According to the voltage curve,the moving process of the metal ring in two liquids was divided into four stages which was discussed in detail,and the force balance equations were also established by force analysis.In this paper,pure water and silicone oil,pure water and ethyl acetate were selected as samples and the interfacial tension were measured separately.