Tuning contact line dynamics on slippery silicone oil grafted surfaces for sessile droplet evaporation.
Tuning contact line dynamics on slippery silicone oil grafted surfaces for sessile droplet evaporation.
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在湿滑的硅油移植表面上调整接触线动力学，以蒸发无柄液滴。
DOI：
10.1038/s41598-023-50579-2
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发表时间：
2024-01-19
影响因子：
4.6
通讯作者：
中科院分区：
文献类型：
--
作者：
控制液滴蒸发的动力学对于许多基础和工业应用至关重要。到目前为止，在光滑表面上报道的三种主要蒸发模式是恒定接触半径（CCR）、恒定接触角（CCA）和混合模式。先前报道的用于控制液滴蒸发的方法包括通过表面涂覆对表面进行化学或物理改性。这些通常需要复杂的多阶段处理，这最终能够实现类似的液滴-表面相互作用。通过利用不同硅油接枝制造参数引起的最外表面的物理化学性质的变化，可以控制蒸发动力学和不同蒸发模式的持续时间。在接枝一层油之后，固有的亲水性硅表面（接触角（CA）<$60 °）转变为具有低接触角滞后（CAH）的疏水性表面（CA <$108 °）。CAH可以在1°和20°之间调节，这取决于制造参数，例如油粘度、体积、沉积方法以及层数，这反过来又控制不同蒸发模式的持续时间。此外，蒸发过程中粘滑行为的发生和强度可以通过所采用的硅油接枝程序来额外控制。这些研究结果提供了指导方针，通过最大限度地减少或最大限度地增加接触线初始钉扎，粘滑和/或恒定接触角模式的蒸发控制液滴表面的相互作用。我们得出结论，这里报道的简单且可扩展的硅油接枝涂层通过赋予无钉扎表面能力而提供与光滑液体注入多孔表面（SLIPS）、准液体表面（QLS）和/或光滑全憎共价附着液体（SOCAL）表面类似的功能，并且具有用于自清洁表面或均匀颗粒沉积的巨大潜力。
Controlling the dynamics of droplet evaporation is critical to numerous fundamental and industrial applications. The three main modes of evaporation so far reported on smooth surfaces are the constant contact radius (CCR), constant contact angle (CCA), and mixed mode. Previously reported methods for controlling droplet evaporation include chemical or physical modifications of the surfaces via surface coating. These often require complex multiple stage processing, which eventually enables similar droplet-surface interactions. By leveraging the change in the physicochemical properties of the outermost surface by different silicone oil grafting fabrication parameters, the evaporation dynamics and the duration of the different evaporation modes can be controlled. After grafting one layer of oil, the intrinsic hydrophilic silicon surface (contact angle (CA) ≈ 60°) is transformed into a hydrophobic surface (CA ≈ 108°) with low contact angle hysteresis (CAH). The CAH can be tuned between 1° and 20° depending on the fabrication parameters such as oil viscosity, volume, deposition method as well as the number of layers, which in turn control the duration of the different evaporation modes. In addition, the occurrence and strength of stick–slip behaviour during evaporation can be additionally controlled by the silicone oil grafting procedure adopted. These findings provide guidelines for controlling the droplet-surface interactions by either minimizing or maximising contact line initial pinning, stick–slip and/or constant contact angle modes of evaporation. We conclude that the simple and scalable silicone oil grafted coatings reported here provide similar functionalities to slippery liquid infused porous surfaces (SLIPSs), quasi-liquid surfaces (QLS), and/or slippery omniphobic covalently attached liquid (SOCAL) surfaces, by empowering pinning-free surfaces, and have great potential for use in self-cleaning surfaces or uniform particle deposition.
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