Bulletin of the American Physical Society
2024 APS March Meeting
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session V00: Poster Session III (1pm-4pm CST)
1:00 PM,
Thursday, March 7, 2024
Room: Hall BC
Abstract: V00.00153 : Unexpected increase in droplet nanofriction on a lubricant-impregnated smooth surface.*
Presenter:
Ryo Sakai
(National Institute for Materials Science(NIMS), Chuo University)
Authors:
Ryo Sakai
(National Institute for Materials Science(NIMS), Chuo University)
Takashi Hiroi
(Shibaura Institute of Technology)
Ryota Tamate
(National Institute for Materials Science (NIMS))
Timothée Mouterde
(The University of Tokyo)
Mizuki Tenjimbayashi
(National Institute for Materials Science (NIMS), Chuo University)
Recently, our group reported a new type of liquid-repellent surface, namely SPLASH(surface with π-interaction liquid adsorption, smoothness, and hydrophobicity). SPLASH is one of the lubricant-impregnated surfaces, whose base layer is smooth. Our motivation is to understand the droplet friction on the SPLASH; however, measuring the accurate droplet friction has been difficult for the classical method due to extremely low droplet friction. Here, we accurately measured the droplet friction on SPLASH using a sensitive capillary cantilever measurement that enables the detection of droplet friction with sub-µN accuracy. It seemed that droplet friction showed typical friction behavior. However, dynamical friction was increasing when droplet was reaching the edge of substrate. Investigations revealed that the friction increase is due to the long-range force from the edge of the substrate. This work experimentally study the origin of the increase in dynamic friction.
*TIA Kakehashi, JSPS KAKENHI 21H01643
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