Penetration Behavior of a Water Droplet into a Cylindrical Hydrophobic Pore
Penetration Behavior of a Water Droplet into a Cylindrical Hydrophobic Pore
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DOI：
10.1021/acs.langmuir.6b01509
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发表时间：
2016-06-28
期刊：
影响因子：
3.9
通讯作者：
Mayama, Hiroyuki
中科院分区：
文献类型：
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作者：
Nonomura, Yoshimune;Tanaka, Tomoya;Mayama, Hiroyuki
了解水滴穿透毛孔的动力学很重要，因为它与植物和动物中的转移现象有关。利用高速相机，我们观察了水滴在硅胶衬底上穿透圆柱孔的过程。水滴上的力是通过将基材加上水滴从几厘米高的高度滴到丙烯酸树脂基材上而产生的。渗透特性取决于孔大小D-p、液滴释放高度h和液滴液体的粘度，并分为以下几种模式：扩散、渗透和破碎。在松弛到稳态的过程中，会出现各种有趣的变形或振荡现象。基于高速图像、中间态界面能和界面能的关系，发现当D-p=1.0时，能垒ΔG=1×10~(-7)J。基于考虑驱动和抑制因素的理论模型，我们估算了mm和h=15，解释了实验得到的包括分离、穿透和破裂模式的相图。
Understanding the dynamics with which a water droplet penetrates a pore is important because of its relationship with transfer phenomena in plants and animals. Using a high-speed camera, we observe the penetration processes of a water droplet into a cylindrical pore on a silicone substrate. The force on the water droplet is generated by dropping the substrate plus water droplet from a height of several centimeters onto an acrylic resin substrate. The penetration characteristics depend on pore size D-p, height of release of a drop h, and the viscosity of the droplet liquid and are classified into the following patterns: spreading, penetration, and breaking. During the process of relaxation to the steady state, various interesting deformation or oscillation phenomena occur. Based on high-speed images, interfacial energy Delta G during the intermediate states and find an energy barrier Delta G = 1 X 10(-7) J when D-p = 1.0 we estimate the mm and h = 15 based on a theoretical model considering the driving and suppression factors, we explain the experimentally obtained phase diagram including the separation, penetration, and breaking patterns.