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Multilayer Adsorption of Heptane Vapor at Water Drop Surfaces

机译:庚烷蒸气在水滴表面的多层吸附

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The measured dynamic surface tension of a water drop in air saturated by heptane vapor shows a sharp decrease from about 60 mN ma??1 to 40 mN ma??1, and less after a certain adsorption time. The observed adsorption kinetics is analyzed by a theoretical model based on multilayer adsorption of alkanes from the vapor phase at the water surface. The model assumes a dependence of the kinetic coefficients of adsorption and desorption on the surface coverage and in equilibrium it reduces to the classical Brunauera??Emmetta??Teller adsorption isotherm. The calculated time dependencies of adsorption and surface tension agree well with experimental data and predict a five-layer adsorption of heptane.
机译:在庚烷蒸气饱和的空气中,测得的水滴动态表面张力显示出从约60 mN ma·m-1急剧下降至40 mN ma·ma-1的急剧下降,并且在一定的吸附时间后减小。通过理论模型对观察到的吸附动力学进行了分析,该理论模型基于在水表面气相吸附烷烃的多层吸附。该模型假设吸附和解吸的动力学系数与表面覆盖率有关,并且在平衡状态下,还原为经典的Brunauera ?? Emmetta ?? Teller吸附等温线。计算的吸附时间和表面张力的时间依赖性与实验数据吻合得很好,并预测了庚烷的五层吸附。

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