What is it about?
The paper demonstrates how liquid drops interact with thin liquid films. They found that drops can sometimes bounce off the film instead of spreading on it. This "contact bouncing" happens when drops have enough momentum. Using high-speed imaging, they observed the behavior of the gas layer between the drop and the film. Thicker films increased gas entrapment but also sped up gas removal, making contact and bouncing more likely. Drops that made contact during this process bounced off with minimal volume loss.
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Why is it important?
Understanding how drops interact with thin liquid films is crucial for improving industrial processes such as printing and coating, where precise fluid control is essential. This knowledge aids in the development of advanced materials with properties like waterproofing, anti-icing, and self-cleaning.
Read the Original
This page is a summary of: Drop Bouncing Dynamics on Ultrathin Films, Langmuir, August 2021, American Chemical Society (ACS),
DOI: 10.1021/acs.langmuir.1c01510.
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