Shek Alvin C M, Semprebon Ciro, Panter Jack R, Kusumaatmaja Halim
Department of Physics, Durham University, Durham DH1 3LE, U.K.
Department of Mathematics, Physics and Electrical Engineering, Northumbria University, Newcastle upon Tyne NE1 8ST, U.K.
Langmuir. 2021 Jan 19;37(2):908-917. doi: 10.1021/acs.langmuir.0c03220. Epub 2021 Jan 4.
We numerically study two-component capillary bridges formed when a liquid droplet is placed in between two liquid-infused surfaces (LIS). In contrast to commonly studied one-component capillary bridges on noninfused solid surfaces, two-component liquid bridges can exhibit a range of different morphologies where the liquid droplet is directly in contact with two, one, or none of the LIS substrates. In addition, the capillary bridges may lose stability when compressed due to the envelopment of the droplet by the lubricant. We also characterize the capillary force, maximum separation, and effective spring force and find that they are influenced by the shape and size of the lubricant ridge. Importantly, these can be tuned to increase the effective capillary adhesion strength by manipulating the lubricant pressure, Neumann angle, and wetting contact angles. As such, LIS are not only "slippery" parallel to the surface, but they are also "sticky" perpendicular to the surface.
我们对当液滴置于两个注液表面（LIS）之间时形成的双组分毛细桥进行了数值研究。与在未注液固体表面上常见的单组分毛细桥不同，双组分液桥可以呈现出一系列不同的形态，其中液滴直接与两个、一个或不与任何一个LIS基底接触。此外，由于润滑剂对液滴的包裹，毛细桥在压缩时可能会失去稳定性。我们还对毛细力、最大分离度和有效弹簧力进行了表征，发现它们受润滑剂脊的形状和尺寸影响。重要的是，通过控制润滑剂压力、纽曼角和润湿接触角，可以对这些参数进行调整以提高有效毛细粘附强度。因此，LIS不仅在平行于表面的方向上是“光滑的”，而且在垂直于表面的方向上也是“粘性的”。
