Large-Scale Dewetting via Surfactant-Laden Droplet Impact

Zhongyuan Ni, Fuqiang Chu, Yanhui Feng, Shuhuai Yao, Dongsheng Wen

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

The dewetting phenomenon of a liquid film in the presence of a surfactant exists in various natural, industrial, and biomedical processes but still remains mysterious in some specific scenarios. Here, we investigate the dewetting behavior of water films initiated by surfactant-laden droplet impact and show that the maximum dewetting diameter can even reach more than 50 times that of the droplet size. We identify the S-type variation of the dewetting area and demonstrate its correlation to the dynamic surface tension reduction. From a viewpoint of energy conversion, we attribute the dewetting to the released surface energy caused by the surfactant addition and establish a linear relation between the maximum dewetting and the surfactant concentration in the film, i.e.,dmax2∝cfilm, which agrees well with the experiments. These results may advance the physics of liquid film dewetting triggered by surfactant injection, which shall further guide practical applications.

Original languageEnglish
Pages (from-to)13729-13736
Number of pages8
JournalLangmuir
Volume37
Issue number46
DOIs
StatePublished - 23 Nov 2021
Externally publishedYes

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