Laboratory of Surface Forces, A.N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninsky prosp. 31 bldg. 4, 119071 Moscow, Russia.
Laboratory of Surface Forces, A.N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninsky prosp. 31 bldg. 4, 119071 Moscow, Russia.
J Colloid Interface Sci. 2022 Mar;609:260-268. doi: 10.1016/j.jcis.2021.11.169. Epub 2021 Dec 4.
Loss of anti-icing properties of slippery liquid-infused porous surfaces (SLIPS) in conditions of repetitive shear stresses is the intrinsic process related to peculiarities of SLIPS structure.
The study of the evolution of the ice adhesion strength to superhydrophobic surfaces (SHS) and SLIPS during repetitive icing/de-icing cycles measured by a centrifugal method was supplemented with the estimation of change in capillary pressure inside the pores, and SEM analysis of the effect of multiple ice detachments on surface morphology.
Obtained data indicated that although for freshly prepared SLIPS, the ice shear adhesion strength at -25 °C was several times lower than for SHS, repetitive icing-deicing cycles resulted in dramatic SLIPS degradation. In contrast, SHS showed weak degradation at least during 50 cycles. Additional to the depletion of an impregnating oil layer, other mechanisms of SLIPS degradation were hypothesized and tested. It was shown that lower capillary pressure required to displace air by water from the surface texture for SLIPSs compared to SHSs resulted in deeper water/ice penetration inside the grooves. The accelerated destruction of the mechanical texture caused by the Rehbinder effect constitutes another mechanism of SLIPSs degradation.
在反复剪切应力的条件下，滑液浸润多孔表面 (SLIPS) 的抗结冰性能丧失是与 SLIPS 结构特点相关的内在过程。
通过离心法测量超疏水表面 (SHS) 和 SLIPS 在反复结冰/除冰循环过程中冰附着强度的演变，并补充了对多孔内部毛细压力变化的估计，以及对多次冰脱附对表面形貌影响的 SEM 分析。
所得数据表明，尽管对于新制备的 SLIPS，在 -25°C 时的冰剪切附着强度比 SHS 低几个数量级，但反复的结冰/除冰循环导致 SLIPS 严重降解。相比之下，SHS 在至少 50 次循环中表现出较弱的降解。除了消耗浸渍油层外，还假设并测试了其他 SLIPS 降解机制。结果表明，与 SHS 相比，SLIPS 表面纹理中用水分置换空气所需的较低毛细压力导致水/冰更深入地渗透到凹槽中。再加上 Rehbinder 效应引起的机械纹理的加速破坏，构成了 SLIPS 降解的另一个机制。
