期刊论文详细信息
JOURNAL OF COLLOID AND INTERFACE SCIENCE 卷:582
Viscoelastic liquid bridge breakup and liquid transfer between two surfaces
Article
Chen, H.1  Ponce-Torres, A.2,3  Montanero, J. M.2,3  Amirfazli, A.1 
[1] York Univ, Dept Mech Engn, Toronto, ON M3J 1P3, Canada
[2] Univ Extremadura, Dept Ingn Mecan Energet & Mat, E-06006 Badajoz, Spain
[3] Univ Extremadura, Inst Computac Cient Avanzada ICCAEx, E-06006 Badajoz, Spain
关键词: Liquid bridge;    Viscoelastic liquid;    Breakup;    Liquid transfer;    Contact line;    Printing;   
DOI  :  10.1016/j.jcis.2020.08.078
来源: Elsevier
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【 摘 要 】

We studied experimentally the breakup of liquid bridges made of aqueous solutions of Poly(acrylic acid) between two separating solid surfaces with freely moving contact lines. For polymer concentrations higher than a certain threshold (-30 ppm), the contact line on the surface with the highest receding con-tact angle fully retracts before the liquid bridge capillary breakup takes place at its neck. This means that all the liquid remains attached to the opposing surface when the surfaces are separated. This behavior occurs regardless of the range of liquid volume and stretching speed studied. Such behavior is very different from that observed for Newtonian liquids or non-Newtonian systems where contact lines are intentionally pinned. It is shown that this behavior stems from the competition between thinning of bridge neck (delayed by extensional thickening) and receding of contact line (enhanced by shear thinning) on the surface with lower receding contact angle. If the two surfaces exhibit the same wetting properties, the upper contact line fully retracts before the capillary breakup due to the asymmetry caused by gravity, and, therefore, all the liquid remains on the lower surface. (C) 2020 Published by Elsevier Inc.

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