부산대학교 도서관

The antibubble has emerged as a promising tool for the microdroplet manipulation since the intermediate air film can protect the inner globule from external contaminants. Moreover, the antibubble structure allows the convenient package and release of microdroplets since the intermediate air film would not hinder the separation between the inner globule and the liquid surface. Despite the development of various methods for antibubble formation, the initial approach involving single drop impact on a free liquid surface has received limited attention in subsequent studies, partly due to the challenges in replicating this phenomenon in practical applications. This paper presents an experimental investigation into antibubble formation via single drop impact on a liquid surface. Experimental results imply that antibubble formation requires the droplet to penetrate deeply into the liquid bath before the intermediate air film collapses or the deformed liquid surface contracts. A theoretical analysis is introduced to emphasize the crucial role of the density difference between the droplet and the liquid bath. A higher density of the droplet results in an increased penetration speed into the liquid bath, facilitating the formation of antibubbles. Notably, this study repeats the experimental results reported by Hughes and Hughes in 1932. Moreover, the method provides a means to control antibubble parameters such as diameter and air film thickness. This control offers valuable insight for subsequent investigations on antibubbles, establishing a foundation for further exploration and application of this intriguing phenomenon. [ABSTRACT FROM AUTHOR]