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首页> 外文期刊>Environmental Science & Technology >Dissolution-Induced Contact Angle Modification in Dense Nonaqueous Phase Liquid/Water Systems
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Dissolution-Induced Contact Angle Modification in Dense Nonaqueous Phase Liquid/Water Systems

机译：浓非水相液/水系统中溶解诱导的接触角修正

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The contact angle between DNAPL, water, and aquifer material interfaces influences the spatial distribution of DNAPLs as they infiltrate into the aquifer, and may ultimately influence their remediation. The objective of this work was to evaluate the effects of dissolution on contact angle. Just as physically retracting a sessile drop reduces its contact angle with a surface, it was speculated that dissolution could cause contact angles to be reduced. Long-term dissolution experiments were conducted over the course of days to weeks, examining the dissolution of sessile drops of two DNAPLs, trichloroethylene (TCE) and tetrachloroethylene (PCE), in water and low concentration surfactant solutions, on glass surfaces. Experiments found that dissolution led to a continuous decrease of contact angle measured through the DNAPL drop, in most cases to near 0°, far lower than angles achievable through measurements of receding contact angles for the same systems. Pinning of drop contact diameter was observed in most experiments. A model developed on the basis of the Bashforth-Adams equation to predict the effect of dissolution on contact angle for drops with a pinned contact diameter showed very good agreement with experimental observations.
机译：DNAPL，水和含水层材料界面之间的接触角会影响DNAPL渗入含水层的空间分布，并可能最终影响其修复。这项工作的目的是评估溶出度对接触角的影响。正如物理上缩回无柄液滴会降低其与表面的接触角一样，据推测溶解会导致接触角减小。在几天到几周的时间内进行了长期溶解实验，检查了两种DNAPL（三氯乙烯（TCE）和四氯乙烯（PCE））在玻璃表面上在水和低浓度表面活性剂溶液中的固溶性。实验发现，溶解会导致通过DNAPL下降测量的接触角连续减小，在大多数情况下接近0°，远低于通过测量相同系统后退接触角可获得的角度。在大多数实验中都观察到液滴接触直径的固定。基于Bashforth-Adams方程开发的模型可预测溶出度对固定接触直径的液滴的接触角的影响，该模型与实验结果非常吻合。

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