Abstract
Determination of surface tension by the Wilhelmy method is facilitated by having a zero contact angle between the Wilhelmy plate and the liquid phase. Compared to filter paper or platinum, nichrome was shown to exhibit minimal hysteresis between advancing and receding contact angles under several experimental conditions. Calibration with a series of solvents of known surface tension indicates that the receding contact angle is zero. Comparison of equilibrium spreading pressures for several lipids measured by the Wilhelmy and Langmuir methods showed proportionality with a slope near 1.0. Thus, nichrome is superior to other commonly used materials for measurements of surface tension at the gas-liquid interface.
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