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首页> 外文期刊>The Journal of Chemical Physics >Determination of the solid surface critical exponent beta(1) from contact-angle variation on approach to a wetting transition: Cyclohexane/aniline/quartz
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Determination of the solid surface critical exponent beta(1) from contact-angle variation on approach to a wetting transition: Cyclohexane/aniline/quartz

机译：从接触角度变化对润湿转变的接触角度的固体表面临界指数β（1）的测定：环己烷/苯胺/石英

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摘要

The three-phase contact angle (theta) for the system cyclohexane/aniline/quartz has been measured from drop shapes as a function of temperature on approach to the cyclohexane/aniline upper consolute solution temperature T-c. The experiments employed exacting criteria previously established for thermodynamic-quality measurements at fluid interfaces. A first-order wetting transition from partial wetting to complete wetting was observed at a temperature T-w, 2.12 K below Tc. The contact angle vanishes at Tw, scaling as cos theta similar to vertical bar T-T-c vertical bar(beta 1-mu) for T < T-w and cos theta = 1.0 for T-w < T < T-c. The experimental results give a value for beta(1) = 0.74 +/- 0.03, in agreement with theoretical calculations. The data clearly rule out higher order contributions to the change in the contact angle near the critical point for this system. These results are in marked contrast to previous measurements on this system from measurements of capillary rise and meniscus curvature. (C) 2016 AIP Publishing LLC.
机译：用于系统环己烷/苯胺/石英的三相接触角（θ）从下落形状作为温度的函数测量，作为环己烷/苯胺上部合作溶液温度T-C的温度。实验采用先前为流体界面处的热力学质量测量建立的严格标准。在温度T-W，2.12k低于TC的温度T-W中观察到从部分润湿到完全润湿的一阶润湿过渡。接触角在TW下消失，缩放为类似于T-W

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