Facile Adhesion-Tuning of Superhydrophobic Surfaces between "Lotus" and "Petal" Effect and Their Influence on Icing and Deicing Properties
Facile Adhesion-Tuning of Superhydrophobic Surfaces between "Lotus" and "Petal" Effect and Their Influence on Icing and Deicing Properties
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DOI：
10.1021/acsami.6b16444
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发表时间：
2017-03-08
影响因子：
9.5
通讯作者：
Losic, Dusan
中科院分区：
文献类型：
--
作者：
Nine, Md J.;Tran Thanh Tung;Losic, Dusan
超疏水（SH）表面的粘附行为是一个活跃的研究领域，涉及受控微滴传输、自清洁、除冰、生化分离、组织工程和集水等各种工程应用。在此，我们报告了一种简便的方法，通过改变聚二甲基硅氧烷（PDMS）的浓度来定时其气隙和粗糙度高度，从而控制 SH 表面特性上的液滴粘附、弹跳和滚动。在双尺度（纳米和微米颗粒）复合材料中最佳使用 PDMS（4-16 wt%）可以控制基质的比表面积 (SSA)、孔体积和粗糙度，从而很好地控制水滴和 SH 表面之间的粘附力。这些表面的滑动角度被调整为在2+/-1和87+/-2度之间变化，这归因于液滴和表面之间的接触类型从“点接触”到“面接触”的转变。我们进一步探索了这些低粘性和高粘性SH表面在结冰和除冰作用中的有效性，这为设计用于低温应用的高效、低成本的除冰表面提供了新的见解。具有较高孔体积的低粘附力（莲花效应）表面表现出相对优异的释冰性能，具有显着的结冰延迟能力，这主要归因于涂层基质中比高粘附力（花瓣效应）的SH基体具有更大的气隙。
Adhesion behavior of superhydrophobic (SH) surfaces is an active research field related to various engineering applications in controlled microdroplet transportation, self-cleaning, deicing, biochemical separation, tissue engineering, and water harvesting. Herein, we report a facile approach to control droplet adhesion, bouncing and rolling on properties of SH surfaces by timing their air-gap and roughness-height by altering the concentrations of poly dimethyl-siloxane (PDMS). The optimal use of PDMS (4-16 wt %) in a dual-scale (nano- and microparticles) composite enables control of the specific surface area (SSA), pore volume, and roughness of matrices that result in a well controlled adhesion between water droplets and SH surfaces. The sliding angles of these surfaces were tuned to be varied between 2 +/- 1 and 87 +/- 2 degrees, which are attributed to the transformation of the contact type between droplet and surface from "point contact" to "area contact". We further explored the effectiveness of these low and high adhesive SH surfaces in icing and deicing actions, which provides a new insight into design highly efficient and low-cost ice-release surface for cold temperature applications. Low adhesion (lotus effect) surface with higher pore-volume exhibited relatively excellent ice-release properties with significant icing delay ability principally attributed to the large air gap in the coating matrix than SH matrix with high adhesion (petal effect).