微水滴在油中溶解的表征
Characterization of the dissolution of water microdroplets in oil
摘要：
油包水乳液具有从化学技术到微流体的广泛应用，其中水滴的稳定性是至关重要的。在这里，我们使用一个可访问的和容易重现的实验装置描述和表征水在油中的溶解，这使得纳升大小的液滴不稳定，导致它们在几个小时的时间尺度内收缩和消失。该方法适用于制造用于结晶的微型反应器。我们测试了多种油及其与表面活性剂的组合，表现出广泛不同的溶解速率。我们推导出简单的分析方程，以确定产品的扩散系数和相对饱和密度的水在油中从测得的溶解数据。通过卡尔费休滴定法测定矿物油和硅油在水饱和前后的水分含量，计算出水在矿物油和硅油中的扩散系数
英文摘要：
Water in oil emulsions have a wide range of applications from chemical technology to microfluidics, where the stability of water droplets is of paramount importance. Here using an accessible and easily reproducible experimental setup we describe and characterize the dissolution of water in oil, which renders nanoliter-sized droplets unstable, resulting in their shrinkage and disappearance in a time scale of hours. This process has applicability in creating miniature reactors for crystallization. We test multiple oils and their combinations with surfactants exhibiting widely different rates of dissolution. We derived simple analytical equations to determine the product of the diffusion coefficient and the relative saturation density of water in oil from the measured dissolution data. By measuring the moisture content of mineral and silicone oils with Karl Fischer titration before and after saturating them with water, we calculated the diffusion coefficient of water in these two oils
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