报告人：Prof Gerald Fuller，Chemical Engineering, Stanford University, Stanford, CA 94305
时间：2018年12月4日（周二）10：00
地点： 广州市番禺区大学城外环西路230号，广州大学计算机实验楼709会议室
摘要：Foaming in liquids is ubiquitous in nature. Whereas the mechanism of foaming in aqueous systems has been thoroughly studied, nonaqueous systems have not enjoyed the same level of examination. Here we study the mechanism of foaming in a widely used class of nonaqueous liquids: lubricant base oils. Using a newly developed experimental technique, we show that the stability of lubricant foams can be evaluated at the level of single bubbles. The results obtained with this single bubble technique indicate that solutocapillary flows are central to lubricant foam stabilization. These soluto-capillary flows are shown to originate from the differential evaporation of multicomponent lubricants—an unexpected result given the low volatility of nonaqueous liquids. Further, we show that mixing of some combinations of different lubricant base oils, a common practice in the industry, exacerbates soluto-capillary flows and hence leads to increased foaming.
