Bulletin of the American Physical Society
74th Annual Meeting of the APS Division of Fluid Dynamics
Volume 66, Number 17
Sunday–Tuesday, November 21–23, 2021; Phoenix Convention Center, Phoenix, Arizona
Session A29: Microscale Flows: Emulsions & Microscale Flows: Interfaces and Wetting
8:00 AM–9:57 AM,
Sunday, November 21, 2021
Room: North 229 A
Chair: Mehdi Molaei, university of pennsylvania
Abstract: A29.00006 : Molecular desorption by a moving contact line*
9:05 AM–9:18 AM
To answer this question, we use atomic force microscopy (AFM) as used before with good results . Thanks to this tools, nanoneedles (with a radius between 60 and 500 nm) are repeatedly dipped in droplets of 6 liquids and the capillary force which appears with the formation of a meniscus is measured.
As the contact line sweeps the nanoneedle surface, the capillary force increases by yielding to a more "hydrophilic" surface. We interpret this effect by the desorption atmospheric contaminants on the solid surface and show that the capillary force at the contact line is at the origin of the mecanism. The dynamic does not change with the liquid or the solid surface but the magnitude is very sensitive with the surface tension of the liquid. Our results open new outlooks on the comprehension of molecular effects at the contact line .
*IMFT -Université de Toulouse, CNRS-INPT-UPS, 31400 Toulouse France
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