Wetting transition of water droplets on superhydrophobic patterned surfaces

2007 ◽  
Vol 57 (12) ◽  
pp. 1057-1060 ◽  
Author(s):  
Yong Chae Jung ◽  
Bharat Bhushan
Keyword(s):  
Wetting Transition ◽  
Patterned Surfaces ◽  
Water Droplets

Viscous liquid–liquid wetting and dewetting of textured surfaces

Soft Matter ◽  
2021 ◽  
Author(s):  
Xiaoyi Hu ◽  
Zhen Wang ◽  
David J. Hwang ◽  
Carlos E. Colosqui ◽  
Thomas Cubaud
Keyword(s):  
Viscous Liquid ◽  
Patterned Surfaces ◽  
Textured Surfaces ◽  
Water Droplets ◽  
Small Water

We experimentally investigate the spreading and receding behavior of small water droplets immersed in viscous oils on grid-patterned surfaces using synchronized bottom and profile views.

scholarly journals Evaporation-Triggered Wetting Transition for Water Droplets upon Hydrophobic Microstructures

2010 ◽  
Vol 104 (11) ◽  
Author(s):  
Peichun Tsai ◽  
Rob G. H. Lammertink ◽  
Matthias Wessling ◽  
Detlef Lohse
Keyword(s):  
Wetting Transition ◽  
Water Droplets

scholarly journals Wetting Transitions of Liquid Gallium Film on Nanopillar-Decorated Graphene Surfaces

Molecules ◽  
2018 ◽  
Vol 23 (10) ◽  
pp. 2407 ◽  
Author(s):  
Junjun Wang ◽  
Tao Li ◽  
Yifan Li ◽  
Yunrui Duan ◽  
Yanyan Jiang ◽  
...  
Keyword(s):  
Metal Droplet ◽  
Adhesion Energy ◽  
Wetting Transition ◽  
Liquid Gallium ◽  
Patterned Surfaces ◽  
Final State ◽  
Wetting Transitions ◽  
Graphene Surface ◽  
Wenzel State ◽  
Wetting Model

Molecular dynamics (MD) simulation has been employed to study the wetting transitions of liquid gallium droplet on the graphene surfaces, which are decorated with three types of carbon nanopillars, and to explore the effect of the surface roughness and morphology on the wettability of liquid Ga. The simulation results showed that, at the beginning, the Ga film looks like an upside-down dish on the rough surface, different from that on the smooth graphene surface, and its size is crucial to the final state of liquid. Ga droplets exhibit a Cassie–Baxter (CB) state, a Wenzel state, a Mixed Wetting state, and a dewetting state on the patterned surfaces by changing distribution and the morphology of nanopillars. Top morphology of nanopillars has a direct impact on the wetting transition of liquid Ga. There are three transition states for the two types of carbon nanotube (CNT) substrates and two for the carbon nanocone (CNC) one. Furthermore, we have found that the substrates show high or low adhesion to the Ga droplet with the variation of their roughness and top morphology. With the roughness decreasing, the adhesion energy of the substrate decreases. With the same roughness, the CNC/graphene surface has the lowest adhesion energy, followed by CNT/graphene and capped CNT/graphene surfaces. Our findings provide not only valid support to previous works but also reveal new theories on the wetting model of the metal droplet on the rough substrates.

Droplets on Micro Structured or Patterned Surfaces With Different Roughness Parameters

2010 ◽  
Author(s):  
Y. Y. Yan ◽  
Y. Q. Zu ◽  
C. Q. Tian ◽  
N. Gao
Keyword(s):  
Dynamic Contact Angle ◽  
Dynamic Contact ◽  
Wetting Transition ◽  
Patterned Surfaces ◽  
Roughness Parameters ◽  
Surface Wetting ◽  
Wetting Properties ◽  
Proposed Model ◽  
Simulation Based ◽  
Boltzmann Method

Surface wetting properties play important roles in boiling and condensation. In this paper, the wetting behaviours of a single droplet on micro structured or patterned surfaces with different roughness parameters are investigated theoretically and numerically. A theoretical model is proposed to study wetting transitions. Comparison between results obtained by theoretical analysis with those of experiment indicates that the proposed model can give a better prediction of wetting transition. In addition, a numerical simulation based on lattice Boltzmann method (LBM) is performed to study surface wetting properties and also the evolution of droplet shapes, dynamic contact angle and corresponding velocity fields. In the simulation, the droplet size is comparable with the scale of micro posts on the surface.

scholarly journals Bouncing-to-wetting transition for impact of water droplets on soft solids

Soft Matter ◽  
2021 ◽  
Author(s):  
Surjyasish Mitra ◽  
Quoc Vo ◽  
Tuan Tran
Keyword(s):  
Wetting Transition ◽  
Liquid Droplets ◽  
Water Droplets ◽  
Soft Solids ◽  
Air Film

Soft surfaces impacted by liquid droplets trap more air underneath than their rigid counterpart. The extended lifetime of the air film not only facilitates bouncing behaviours of the impacting droplets...

Confinement of water droplets on rectangular micro/nano-arrayed surfaces

Lab on a Chip ◽  
2016 ◽  
Vol 16 (13) ◽  
pp. 2487-2493 ◽  
Author(s):  
Ondřej Kašpar ◽  
Hailong Zhang ◽  
Viola Tokárová ◽  
Reinhard I. Boysen ◽  
Gemma Rius Suñé ◽  
...  
Keyword(s):  
Patterned Surfaces ◽  
Water Droplets

Micro-patterned surfaces with alternate hydrophilic and hydrophobic rectangular areas effectively confine water droplets down to attolitre volumes.

Evaporation of water droplets on soft patterned surfaces

Soft Matter ◽  
2014 ◽  
Vol 10 (19) ◽  
pp. 3394 ◽  
Author(s):  
Yu-Chen Chuang ◽  
Che-Kang Chu ◽  
Shih-Yao Lin ◽  
Li-Jen Chen
Keyword(s):  
Patterned Surfaces ◽  
Water Droplets

The influence of nanostructure on the wetting transition of polyvinylidene fluoride nanoweb: from the petal effect to the lotus effect

2020 ◽  
pp. 004051752095523
Author(s):  
Hyae Rim Hong ◽  
Chung Hee Park
Keyword(s):  
Contact Angle ◽  
Surface Structure ◽  
Plasma Etching ◽  
Polyvinylidene Fluoride ◽  
Apparent Contact Angle ◽  
Wetting Transition ◽  
Etching Time ◽  
Water Droplets ◽  
Lotus Effect ◽  
The Impact

In this study, the effects of the surface structure of electrospun polyvinylidene fluoride (PVDF) nanoweb on surface wettability were analyzed. The conditions of the surface structure representing the lotus and petal effects were derived, and the difference in the dynamic behavior of the water droplets on the surfaces was investigated. To this end, a PVDF nanoweb was fabricated by electrospinning various concentrations of PVDF solutions. The nanoscale roughness was adjusted by varying the CF4 plasma etching time. It was seen that when the concentration of the electrospun PVDF solution was 15 or 20 wt%, a hierarchical structure of microbeads and nanofibers was formed. In the 20 wt% nanoweb, droplets formed an apparent contact angle of 149.5 ± 2.2°, and the petal effect was observed in which the droplets were pinned on the surface and did not roll off even when the nanoweb was tilted by 180°. As a result of introducing fine nanostructures with CF4 plasma etching on the 20 wt% nanoweb, the apparent contact angle increased to 162.8–164.4°, and the shedding angle decreased to 5.3–8.1°, showing a wetting transition to the lotus effect, regardless of the plasma etching time. In addition, the lotus effect was observed when 15 wt% nanoweb was treated with CF4 plasma etching for more than 10 min. We confirmed that the lotus effect was exhibited when the three-phase contact line of the PVDF nanoweb/water/air was discontinuous, and the contact area between the surface and the water droplets was reduced with increased air pockets at this interface, which led to a decrease in the adhesive force and the impact of negative pressure.

scholarly journals Evaporation of Sessile Water Droplets on Horizontal and Vertical Biphobic Patterned Surfaces

Langmuir ◽  
2019 ◽  
Vol 35 (52) ◽  
pp. 17185-17192 ◽  
Author(s):  
Wenliang Qi ◽  
Junhui Li ◽  
Patricia B. Weisensee
Keyword(s):  
Patterned Surfaces ◽  
Water Droplets
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