Droplet Self-Propulsion on Slippery Liquid-Infused Surfaces with Dual-Lubricant Wedge-Shaped Wettability Patterns.
Droplet Self-Propulsion on Slippery Liquid-Infused Surfaces with Dual-Lubricant Wedge-Shaped Wettability Patterns.
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DOI：
10.1021/acs.langmuir.3c02205
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发表时间：
2023-11-07
期刊：
影响因子：
3.9
通讯作者：
Kusumaatmaja, Halim
中科院分区：
文献类型：
--
作者：
Pelizzari, Michele;McHale, Glen;Armstrong, Steven;Zhao, Hongyu;Ledesma-Aguilar, Rodrigo;Wells, Gary G.;Kusumaatmaja, Halim
杨氏方程是固体表面润湿性概念的基础。它通过三相接触线处的局部平衡定义固体表面上液滴的接触角。最近，液体杨氏定律接触角的概念被开发出来，用于描述不混溶液体液滴对光滑液体注入多孔表面（SLIPS）的润湿性。在这项工作中，我们提出了一种制造双亲性 SLIP 表面的新方法，并展示了如何通过两种不同润滑液体的宏观楔形图案来利用复合 SLIPS 的润湿性。特别是，我们报告了基于光刻图案化 Teflon AF1600 涂层和超疏水涂层（Glaco Mirror Coat Zero）的硅基底上复合液体表面的开发，其中后者选择性地从前者去湿。这会形成一个图案化的基底表面，并优先润湿匹配的液体：含氟聚合物 PTFE 与全氟化油 Krytox 以及疏水性二氧化硅基 GLACO 与橄榄油（或其他矿物油或硅油）。这使我们能够连续地用两种不同的油吸收我们的图案化固体基材，并产生复合液体润滑剂表面，其中油作为薄膜隔离到由图案化定义的单独区域中。我们说明了宏观楔形图案 SLIP 表面能够实现低摩擦液滴自推进。最后，我们制定了一个分析模型，该模型捕获了液滴运动与两个液体润滑剂域的润湿性和楔形张角的函数关系。这使我们能够得出各种物理和几何参数之间的比例关系。这项工作介绍了一种创建图案化液体润滑剂表面的新方法，演示了此类表面上的长距离液滴自推进，并揭示了液滴与液体表面之间的相互作用。
Young’s equation is fundamental to the concept of the wettability of a solid surface. It defines the contact angle for a droplet on a solid surface through a local equilibrium at the three-phase contact line. Recently, the concept of a liquid Young’s law contact angle has been developed to describe the wettability of slippery liquid-infused porous surfaces (SLIPS) by droplets of an immiscible liquid. In this work, we present a new method to fabricate biphilic SLIP surfaces and show how the wettability of the composite SLIPS can be exploited with a macroscopic wedge-shaped pattern of two distinct lubricant liquids. In particular, we report the development of composite liquid surfaces on silicon substrates based on lithographically patterning a Teflon AF1600 coating and a superhydrophobic coating (Glaco Mirror Coat Zero), where the latter selectively dewets from the former. This creates a patterned base surface with preferential wetting to matched liquids: the fluoropolymer PTFE with a perfluorinated oil Krytox and the hydrophobic silica-based GLACO with olive oil (or other mineral oils or silicone oil). This allows us to successively imbibe our patterned solid substrates with two distinct oils and produce a composite liquid lubricant surface with the oils segregated as thin films into separate domains defined by the patterning. We illustrate that macroscopic wedge-shaped patterned SLIP surfaces enable low-friction droplet self-propulsion. Finally, we formulate an analytical model that captures the dependence of the droplet motion as a function of the wettability of the two liquid lubricant domains and the opening angle of the wedge. This allows us to derive scaling relationships between various physical and geometrical parameters. This work introduces a new approach to creating patterned liquid lubricant surfaces, demonstrates long-distance droplet self-propulsion on such surfaces, and sheds light on the interactions between liquid droplets and liquid surfaces.
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影响因子：
4.6
作者：
Edwards AMJ;Ruiz-Gutiérrez É;Newton MI;McHale G;Wells GG;Ledesma-Aguilar R;Brown CV
通讯作者：
Brown CV
影响因子：
1.8
作者：
Lafuma, A.;Quere, D.
通讯作者：
Quere, D.
影响因子：
41.2
作者：
Binks, Bernard P.;Murakami, Ryo
通讯作者：
Murakami, Ryo
影响因子：
17.1
作者：
Dai, Xianming;Stogin, Birgitt Boschitsch;Wong, Tak-Sing
通讯作者：
Wong, Tak-Sing
受控液滴传输到具有多梯度的高粘附表面上的目标
影响因子：
4.6
作者：
Deng S;Shang W;Feng S;Zhu S;Xing Y;Li D;Hou Y;Zheng Y
通讯作者：
Zheng Y