Dynamic Wetting Failure and Air Entrainment in Surfactant Solutions

Kumar 1434016这项研究专注于探索动态润湿，这是指最初与固体表面接触的某些液体(例如空气)被从固体表面推进的液体的置换。在涂布过程中，后退的流体是空气，它夹带到液体中可能是灾难性的，因为需要严格控制涂布的均匀性以确保产品的完整性。事实上，动态润湿失效的开始仍然是提高需要液体涂层的产品的当前制造速度的主要障碍之一。这是一项从根本上理解具有经济影响的实际应用的明确路径的建议。了解润湿失效，这是一种在制造带有涂层的材料中非常常见的过程，可能会对涂料行业产生影响。这是一项研究液体中存在表面活性剂分子时润湿过程失效的建议。虽然最近的研究认为牛顿液体不含任何表面活性剂，但实际上大多数涂层液体确实含有表面活性剂。然而，尽管表面活性剂在涂布过程中很重要，但人们对表面活性剂如何影响动态润湿失效和空气夹带却知之甚少。这项建议的目标是通过理论和实验相结合的方式来促进这一理解。

Kumar 1434016This research is focused on exploring dynamic wetting, which is the displacement of some fluid (for example, air) initially in contact with a solid surface by a liquid that advances over the surface. In coating processes the receding fluid is air, and its entrainment into the liquid can be catastrophic since stringent control of coating uniformity is required to ensure product integrity. Indeed, the onset of dynamic wetting failure remains one of the primary obstacles to improving upon current manufacturing speeds for products that require liquid-applied coatings. This is a proposal with a clear path for fundamental understanding to practical applications with economic impact. Understanding wetting failure, a process that is quite common in manufacturing materials with coatings, can have an impact in the coating industry.This is a proposal to study the failure of the wetting process when surfactant molecules are present in the liquid. While recent work considers Newtonian liquids without any surfactants, in practice most coating liquids do contain surfactants. However, despite the importance of surfactants in coating processes, there is little fundamental understanding of how surfactants influence dynamic wetting failure and air entrainment. The objective of this proposal is to advance this understanding using a combination of theory and experiment.