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首页> 外文期刊>Langmuir: The ACS Journal of Surfaces and Colloids >Measurements of line tension for solid-liquid-vapor systems using drop size dependence of contact angles and its correlation with solid-liquid interfacial tension
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Measurements of line tension for solid-liquid-vapor systems using drop size dependence of contact angles and its correlation with solid-liquid interfacial tension

机译：使用接触角的液滴尺寸依赖性及其与固液界面张力的关系来测量固液蒸气系统的线张力

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According to the modified Young equation, one of the direct ways of measuring line tension for solid-liquid-vapor systems takes advantage of the dependence of the contact angle on the radius of curvature of the three-phase line. This approach was used to determine line tension measurements for six organic liquids on two different self-assembled monolayer (SAM) surfaces (mixed monolayers of methyl and carboxylic acid terminated alkanethiol on gold at two different composition levels). Low-rate advancing contact; angles were measured using Axisymmetric Drop Shape Analysis-Profile (ADSA-P). The general trend observed for each system was that the contact angle decreases as the radius of the three-phase line for the sessile drop increases from approximately 1 to 5 mm. It was found that the drop size dependence of contact angles can be interpreted as being due to a positive line tension. The line tension values are all in the order of 10(-6) J/m. Also a correlation was observed between the line tension and the solid-liquid interfacial tension for a series of liquids on each of the two surfaces. This observation conforms to the predictions from a phase rule discussion for capillary systems. [References: 52]
机译：根据修改后的杨氏方程，测量固-液-汽系统线张力的直接方法之一是利用接触角对三相线曲率半径的依赖性。该方法用于确定在两个不同的自组装单层（SAM）表面上的六种有机液体的线张力测量值（甲基和羧酸封端的链烷硫醇在金上的混合单层处于两个不同的组成水平）。低价提前联系;使用轴对称液滴形状分析轮廓（ADSA-P）测量角度。观察到的每个系统的总体趋势是，随着固着线的三相线的半径从大约1毫米增加到5毫米，接触角会减小。已经发现，接触角的液滴尺寸依赖性可以解释为是由于正线张力。线张力值均在10（-6）J / m左右。还观察到在两个表面中的每个表面上的一系列液体的线张力和固液界面张力之间的相关性。该观察结果符合关于毛细管系统的相位规则讨论的预测。 [参考：52]

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