Controlling uniform patterns by evaporation of multi-component liquid droplets in a confined geometry. Issue 13 (15th December 2020)

• Record Type: Journal Article
• Authors: Pyeon, Jeongsu; Kim, Hyoungsoo
• Is Part Of: Soft matter. Volume 17:Issue 13(2021)
• Page Start: 3578
• Page End: 3585
• Publication Date: 2020-12-15
• Subjects: Soft condensed matter -- Periodicals; 530.413
• DOI: 10.1039/d0sm01872d
• Languages: English
• ISSNs: 1744-683X

Abstract

Abstract : A drying multi-component liquid droplet in a confined geometry leaves a uniform dried pattern. The evaporated vapors are stagnated inside the closed chamber, which induce Marangoni effects that contribute to suppress the coffee-ring pattern. Abstract : Surface-coating technologies are important for a variety of applications, e.g. ink-jet printing, micro-electronic engineering and biological arrays. In this study, we introduce a novel idea to obtain uniform patterns with multi-component solution in a confined geometry. When a droplet of the multi-component liquid evaporates in the confined area, the evaporated vapors are stagnated inside the confined chamber where the evaporated liquid molecule is much heavier than the ambient air. These vapors change internal flow in the droplet by generating Marangoni effects during evaporation, which help to obtain uniform deposition. Finally, we show that a coffee-ring is totally suppressed and a uniformly dried pattern is achieved. For a potential application as display panels, we use quantum dots and create a uniform light-emitting layer.