Evaporation of sessile droplets containing non-volatile solutes dispersed in a volatile solvent leaves behind ring-like solid stains. As the volatile species evaporates, pinning of the contact line gives rise to capillary flows that transport non-volatile solutes to the contact line. This phenomenon, called the coffee-ring effect, compromises the overall performance of industrially relevant manufacturing processes involving evaporation such as printing, biochemical analysis, manufacturing of nano-structured materials through colloidal and macromolecular patterning. Various approaches have been developed to suppress this phenomenon, which is otherwise difficult to avoid. The coffee-ring effect has also been leveraged to prepare new materials through convection induced assembly. This review underlines not only the strategies developed to suppress the coffee-ring effect but also sheds light on approaches to arrive at novel processes and materials. Working principles and applicability of these strategies are discussed together with a critical comparison.

包含分散在挥发性溶剂中的非挥发性溶质的无蒂液滴的蒸发留下环状固体污渍。随着挥发性物质的蒸发，接触线的钉扎会引起毛细流，从而将非挥发性溶质传输到接触线。这种被称为咖啡环效应的现象损害了与工业相关的制造过程的整体性能，这些过程涉及蒸发，例如印刷，生化分析，通过胶体和大分子图案制造纳米结构材料。已经开发出各种方法来抑制这种现象，否则很难避免这种现象。通过对流诱导组装，还利用了咖啡环效应来制备新材料。这篇综述不仅强调了抑制咖啡环效应的策略，而且还阐明了实现新颖工艺和材料的方法。讨论了这些策略的工作原理和适用性，并进行了严格的比较。