BakhshandehSeraji R, Palasantzas G
Department of Physics, Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands.
Phys Rev E. 2023 Nov;108(5-1):054801. doi: 10.1103/PhysRevE.108.054801.
The pull-off adhesion force was measured by atomic force microscopy in sphere-plate geometry in water where a capillarylike behavior develops due to nanobubbles and was compared to the corresponding capillary adhesion in air. The sphere and the plate were coated with gold, and the pull-off adhesion force was measured as a function of the evolving surface roughness of the plate, and the retraction velocity of the interacting surfaces. In absolute magnitude, the pull-off force in air is larger than that in liquid by an order of magnitude or more, but in both cases, the pull-off force follows a monotonic decrease with increasing roughness. However, the relative decrement of the adhesion force in water was approximately 300%, and significantly higher than that in air for the same change of the rms roughness in the range ∼7-14 nm. Finally, the adhesion force in water shows a relatively complex dependence on the retraction velocity of the interacting surfaces as the roughness increases due to possible deformation of the nanobubbles and the bridges they form between the surfaces.
通过原子力显微镜在水的球-板几何结构中测量拉脱粘附力，在这种情况下，由于纳米气泡会出现类似毛细管的行为，并将其与空气中相应的毛细管粘附力进行比较。球体和平板均涂有金，测量拉脱粘附力作为平板不断变化的表面粗糙度以及相互作用表面回缩速度的函数。在绝对值上，空气中的拉脱力比液体中的大一个数量级或更多，但在两种情况下，拉脱力都随着粗糙度的增加而单调下降。然而，对于均方根粗糙度在约7-14纳米范围内的相同变化，水中粘附力的相对下降约为300%，且明显高于空气中的下降。最后，随着粗糙度增加，由于纳米气泡及其在表面之间形成的桥可能发生变形，水中的粘附力对相互作用表面的回缩速度表现出相对复杂的依赖性。
