S Aghdam Araz, Cebeci Fevzi Ç
Faculty of Engineering and Natural Sciences, Sabanci University, 34956 Istanbul, Turkey.
Sabanci University SUNUM Nanotechnology Research Centre, 34956 Istanbul, Turkey.
Langmuir. 2020 Nov 24;36(46):14145-14154. doi: 10.1021/acs.langmuir.0c02873. Epub 2020 Nov 10.
There has been increasing interest in recent years in identifying an ice-removal procedure that is low cost and scalable and consumes a negligible amount of energy in order to prevent catastrophic failures in outdoor structures. One of the potential solutions to the structural problems caused by frigid and icy conditions is the use of slippery liquid-infused porous surfaces (SLIPS) to effect passive ice removal using easy, economical, and energy-free means. This work takes advantage of the highly flexible layer-by-layer (LbL) technology to customize and design surfaces that have a high degree of roughness using negatively and positively charged polyelectrolytes and negatively charged silica nanoparticles (NPs). SEM (scanning electron microscopy) images represent the silica nanoparticles deposition on the surface of the thin film. The roughness of these thin films has been demonstrated by AFM (atomic force microscopy) investigation. The main characteristics of these surfaces are their high contact angle and low water contact angle hysteresis, which is achieved by the fluorinated lubricant that is infused in the pores of the films. The ice adhesion strength of the thin films was measured using a home-built normal mode tensile test in an environmental chamber, which confirmed the icephobicity of the surface as having an adhesion strength of less than 5 kPa, implying that this surface is an excellent candidate for passive removal of ice. The thin films were aged for up to 100 days, and the results showed that the thin film could reduce the ice adhesion strength by 65%, even after this period. The ice adhesion strength of the thin film after icing/deicing cycles showed that 80% of the icephobicity of the thin film had been preserved even after 50 cycles.
近年来，人们越来越关注确定一种低成本、可扩展且能耗可忽略不计的除冰程序，以防止户外结构发生灾难性故障。解决寒冷和结冰条件引起的结构问题的潜在解决方案之一是使用注入滑液的多孔表面（SLIPS），通过简单、经济且无能耗的方式实现被动除冰。这项工作利用高度灵活的逐层（LbL）技术，使用带负电荷和正电荷的聚电解质以及带负电荷的二氧化硅纳米颗粒（NPs）来定制和设计具有高度粗糙度的表面。扫描电子显微镜（SEM）图像显示了二氧化硅纳米颗粒在薄膜表面的沉积情况。这些薄膜的粗糙度已通过原子力显微镜（AFM）研究得到证实。这些表面的主要特征是其高接触角和低水接触角滞后，这是通过注入薄膜孔隙中的氟化润滑剂实现的。在环境试验箱中使用自制的正常模式拉伸试验测量了薄膜的冰粘附强度，结果证实该表面具有疏冰性，粘附强度小于5 kPa，这意味着该表面是被动除冰的极佳候选材料。薄膜老化长达100天，结果表明即使在此期间后，薄膜仍可将冰粘附强度降低65%。结冰/除冰循环后薄膜的冰粘附强度表明，即使经过50次循环，薄膜仍保留了80%的疏冰性。
