Ionic liquids-infused slippery surfaces for condensation and hot water repellency
Ionic liquids-infused slippery surfaces for condensation and hot water repellency
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DOI：
10.1016/j.cej.2018.03.045
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发表时间：
2018-07
影响因子：
15.1
通讯作者：
Xuehao Wang;C. Gu;Longhu Wang;Jiaxun Zhang;J. Tu
中科院分区：
文献类型：
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作者：
Xuehao Wang;C. Gu;Longhu Wang;Jiaxun Zhang;J. Tu
具有疏水性和有效冷凝的功能表面在学术研究和实际应用中都引起了极大的兴趣。两种不同链长的1-烷基-3-甲基咪唑六氟磷酸盐离子液体（[CnmIm][PF6]，n = 4（[BmIm][PF6]），n = 8（[OmIm][PF 6]））分别注入到由（Ni，Co）-（CO 3）0.5（OH）0.11H2O纳米锥阵列构成的多孔表面（NiCo-NCA），旨在生产具有稳定非润湿性能的光滑表面（SS）。在离子液体注入之前，NiCo-NCA表面被低表面能材料官能化以赋予超疏水性。改性的NiCo-NCA的超疏水性在高达约240 °C的热处理后由于表面上裂纹的形成而变得无效。然而，由于注入流体的自修复能力和热稳定性，在注入IL的样品中可以保持光滑表面，随后进行相同的热处理。此外，热水滴是排斥的离子液体注入的SS，而钉在超疏水表面上。与超疏水表面相比，注入离子液体的表面更容易使凝结水滴成核。由于[OmIm][PF 6]的粘度较高，冷凝水和热水滴在[OmIm][PF 6]注入的SS上的滑动速度比在[BmIm][PF 6]注入的SS上的滑动速度慢。同时，注入离子液体的SS可以承受物理损伤和液滴撞击。注入离子液体的自组装膜在热液自清洁和高效液滴控制方面显示出良好的应用前景。
Functional surfaces that enable both hot water repellency and effective condensation have attracted great interest in both academic research and practical applications. Two kinds of 1-alkyl-3-methylimidazolium hexafluorophosphate ionic liquids (ILs) with different chain lengths ([CnmIm][PF6], n = 4 ([BmIm][PF6]), n = 8 ([OmIm][PF6])) are respectively infused into the porous surface constructed by nanocone arrays of (Ni,Co)-(CO3)0.5(OH)0.11H2O (NiCo-NCA), aiming to produce slippery surfaces (SSs) with stable non-wetting performance. Before the ILs infusion, the NiCo-NCA surface is functionalized by low surface energy material for conferring superhydrophobicity. The superhydrophobicity of the modified NiCo-NCA becomes ineffective after the heat treatment up to about 240 °C due to the formation of cracks on the surface. However, the slippery surfaces can be maintained in the ILs-infused samples followed by the same heat treatment due to the self-healing ability and thermal stability of the infused fluids. Moreover, hot water droplets are repellent on the ILs-infused SSs while pinned on the superhydrophobic surface. The nucleation process of condensing water droplets is easier on the ILs-infused SSs than that on the superhydrophobic surface. The sliding speed of the condensed water and the hot water droplets on the [OmIm][PF6]-infused SS are slower than those on the [BmIm][PF6]-infused SS due to the higher viscosity of [OmIm][PF6]. As well, the ILs-infused SSs can endure physical damage and impacting droplet. The ILs-infused SSs shows promise potential applications in hot liquid self-cleaning and high efficiency droplet manipulation.