花瓣
润湿
下降(电信)
罗斯(数学)
莲花效应
缩放比例
接触角
材料科学
复制品
化学
园艺
复合材料
数学
生物
几何学
原材料
电信
艺术
视觉艺术
有机化学
计算机科学
作者
Saumyadwip Bandyopadhyay,Anshika Shristi,Vinit Kumawat,Ayan Gope,Anurup Mukhopadhyay,Suman Chakraborty,Rabibrata Mukherjee
出处
期刊:Langmuir
[American Chemical Society]
日期:2023-04-17
卷期号:39 (17): 6051-6060
被引量:5
标识
DOI:10.1021/acs.langmuir.3c00063
摘要
Rose petals exhibit a phenomenal wetting property of being sticky and superhydrophobic simultaneously. A recent study has shown that for short timescales, associated with drop impact phenomenon, lotus leaf and rose petal replicas exhibit similar wettability, thereby highlighting the difference between long and short time wettability. Also, short time wetting on rose petals of different colors remains completely unaddressed, as almost all existing study on wetting of rose petals have been performed with the classical red rose (Rosa chinensis). In this paper, we compare the drop impact studies on replicas of a yellow rose petal, with those on extensively studied red rose petal replicas and the lotus leaf over a wide range of Weber number (We), by varying the height of fall (h) from 10 to 375 mm. Our results reveal that over the replica of a yellow rose petal, the initial impact outcome varies from complete rebound to micro pinning and eventually complete pinning depending on the kinetic energy of the impacting drop, in contrast to that on red rose petal replica on which the droplet always pinned. Based on experimental finding, we present a comprehensive regime phase map of the post impact behavior of the drop on different surfaces as a function of impact height. We also present a simple scaling analysis to understand the combined effect of pattern height and periodicity on the critical h corresponding to wetting regime transition. Additionally, variation of maximum spreading diameter and spreading time with the h for the different surfaces is also discussed. The results highlight that the initial impact dynamics of a water drop over a topographically patterned substrate is a strong function of the topographical parameters and can be very different from the equilibrium wetting state.
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