气泡长大技术测定表面活性剂溶液的动表面张力

MEASURING DYNAMIC SURFACE TENSION OF SURFACTANT SOLUTIONS BY USING GROWING BUBBLE METHOD

在理论分析的基础上,采用计算机图像采集技术,实时记录气泡的长大过程,用图像分析技术确定气泡边缘形状,即采用局部阈值的边缘跟踪算法识别气泡的边缘井进行优化,建立了根据气泡图像测定动表面张力的实验装置,可直接测量动表面张力随时间的变化.测定了十二烷基硫酸钠溶液的动表面张力.

A technique for measuring dynamic surface tensions, which is based on the theoretical analysis on a growing bubble, is proposed. The growing process of the bubble is captured by video-image technique. An edge-tracing algorithm using a local threshold and profile optimization is applied to determining the shape of the growing bubble. A device for measuring the dynamic surface tension from the profile of a growing bubble is set up, so that the dynamic surface tension can be determined directly as a function of time. The dynamic surface tensions of sodium dodecyl sulfate (SDS) solutions are also measured.