Effect of liquid droplet surface tension on impact dynamics over hierarchical nanostructure surfaces

Nanoscale
Seunghyeon BaekKijung Yong

Abstract

Analyzing impact dynamics is important for practical applications of superhydrophobic surfaces, because these nonwetting surfaces frequently encounter impacting liquid droplets in real environments. Thus, various studies have been conducted to investigate impact dynamics by examining the correlation between the behaviors of impacting liquid droplets and several determining parameters, such as impacting velocity, surface structure and surface energy. The impacting behaviors of pure water droplets were the main focus in most previous studies; the effect of surface tension, another critical parameter, on impact dynamics has rarely been investigated. In the current work, we have newly studied the effects of liquid surface tension on impact dynamics using an ethanol-water solution as a model liquid system. We systematically varied the liquid's surface tension between 72 and 32 mN m-1 by changing the ethanol concentration from 0 to 20 wt%. This range of composition drastically changed the surface tension while it did not significantly affect other physical properties, such as density and viscosity. For an impact dynamics study, two surfaces, namely ZnO nanowires (NWs) and ZnO/Si hierarchical (HIE) structures, were prepared. As the su...Continue Reading

References

Apr 24, 2001·Ultrasound in Medicine & Biology·K Martin, D Spinks
Jul 21, 2006·The Journal of Physical Chemistry. B·Youngjo Tak, Kijung Yong
Dec 17, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Bin SuQinghua Lu
May 29, 2012·Langmuir : the ACS Journal of Surfaces and Colloids·Susmita DashSuresh V Garimella
Feb 7, 2017·Chemical Communications : Chem Comm·Qiang WangJiaqi Zhu
May 26, 2017·Nanoscale·Gi Byoung HwangIvan P Parkin
Jul 19, 2017·ACS Nano·Megan D MulroeJonathan B Boreyko

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Methods Mentioned

BETA
SmartDrop
quartz crystal microbalance

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