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Surface tension is an important parameter of liquid surface properties. In order to improve the accuracy and stability of the parameter measurement, full-profile fitting pendent drop method is utilized in this article, and algorithm to determine the initial value in two-dimensional optimization is improved. Moreover, the error function is modified via a weighting factor, which reduces the influence of droplet profile deviation point to the surface tension measurement. At 25℃ and a standard atmospheric pressure, the improved full-profile fitting method is used to calculate the surface tension of water and ethanol. The final results show that the stability and repeatability of the improved full-profile fitting pendent drop method is much better than the previous method, which effectively verifies the feasibility and superiority of the improved method.

Improvements on full-profile fitting pendent drop method used for surface tension measurement