Ultrafast laser hybrid fabrication of hierarchical 3D structures of nanorods on microcones for superhydrophobic surfaces with excellent Cassie state stability and mechanical durability

2020 ◽  
Vol 32 (2) ◽  
pp. 022047
Author(s):  
Rui Pan ◽  
Mingyong Cai ◽  
Weijian Liu ◽  
Xiao Luo ◽  
Changhao Chen ◽  
...  
Keyword(s):  
Ultrafast Laser ◽  
Superhydrophobic Surfaces ◽  
3D Structures ◽  
Cassie State ◽  
Mechanical Durability ◽  
Laser Hybrid

Cassie-State Stability of Metallic Superhydrophobic Surfaces with Various Micro/Nanostructures Produced by a Femtosecond Laser

Langmuir ◽  
2016 ◽  
Vol 32 (4) ◽  
pp. 1065-1072 ◽  
Author(s):  
Jiangyou Long ◽  
Lin Pan ◽  
Peixun Fan ◽  
Dingwei Gong ◽  
Dafa Jiang ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Superhydrophobic Surfaces ◽  
Cassie State

scholarly journals SURFACE EVOLVER SIMULATIONS OF DROPS ON MICROPOSTS

2012 ◽  
Vol 23 (08) ◽  
pp. 1240013 ◽  
Author(s):  
MATTHEW L. BLOW ◽  
JULIA M. YEOMANS
Keyword(s):  
Free Energy ◽  
Arbitrary Shape ◽  
Liquid Surface ◽  
Superhydrophobic Surfaces ◽  
Surface Evolver ◽  
Horizontal Section ◽  
Good Convergence ◽  
Cassie State ◽  
Wenzel State ◽  
Solid Liquid

An important feature in the design of superhydrophobic surfaces is their robustness against collapse from the Cassie–Baxter configuration to the Wenzel state. Upon such a transition a surface loses its properties of low adhesion and friction. We describe how to adapt the Surface Evolver algorithm to predict the parameters and mechanism of the collapse transition on posts of arbitrary shape. In particular, contributions to the free energy evaluated over the solid–liquid surface are reduced to line integrals to give good convergence. The algorithm is validated for straight, vertical and inclined, posts. Numerical results for curved posts with a horizontal section at their ends show that these are more efficient in stabilizing the Cassie state than straight posts, and identify whether the interface first depins from the post sides or the post tips.

Designing Self-Healing Superhydrophobic Surfaces with Exceptional Mechanical Durability

2017 ◽  
Vol 9 (12) ◽  
pp. 11212-11223 ◽  
Author(s):  
Kevin Golovin ◽  
Mathew Boban ◽  
Joseph M. Mabry ◽  
Anish Tuteja
Keyword(s):  
Superhydrophobic Surfaces ◽  
Self Healing ◽  
Mechanical Durability

Evaporation and Condensation on Two-Tier Superhydrophobic Surfaces

2008 ◽  
Author(s):  
Chuan-Hua Chen ◽  
Qingjun Cai ◽  
Chung-Lung Chen
Keyword(s):  
Superhydrophobic Surfaces ◽  
Enhance Heat Transfer ◽  
Evaporation And Condensation ◽  
Cassie State ◽  
Wenzel State ◽  
Change Behavior ◽  
Lotus Leaves ◽  
First Time ◽  
Short Carbon ◽  
Nanoscale Roughness

Superhydrophobic surfaces exhibit large contact angle and small hysteresis which promote liquid transport and enhance heat transfer. Here, liquid-vapor phase change behavior is reported on superhydrophobic surfaces with short carbon nanotubes deposited on micromachined posts, a two-tier texture mimicking the surface structure of lotus leaves. Compared to one-tier microtexture which energetically favors the Wenzel state, the two-tier texture with nanoscale roughness favors the Cassie state, the desired superhydrophobic state. During droplet evaporation, the two-tier texture delays the transition from Cassie to Wenzel state. Using two-tier texture with hexadeconethiol coating, continuous dropwise condensation was demonstrated for the first time on engineered superhydrophobic surfaces.

How Nanostructures Affect Water Droplet Nucleation on Superhydrophobic Surfaces

2017 ◽  
Vol 139 (11) ◽  
Author(s):  
Abulimiti Aili ◽  
QiaoYu Ge ◽  
TieJun Zhang
Keyword(s):  
Water Droplet ◽  
Superhydrophobic Surfaces ◽  
Experimental Investigations ◽  
Nucleation Density ◽  
Moderate Increase ◽  
Droplet Shape ◽  
Energy Applications ◽  
Cassie State ◽  
Droplet Nucleation ◽  
Surrounding Areas

Nucleation is the first stage of phase change phenomena, including condensation on nanostructured superhydrophobic surfaces. Despite plenty of theoretical studies on the effect of nanostructure density and shape on water droplet nucleation, not many experimental investigations have been reported. Here, we show both experimentally and theoretically that a moderate increase in the nanostructure density can lead to an increase in the nucleation density of water droplets because of the decreased energy barrier of nucleation in cavities formed between the nanostructures. Specifically, we observed droplets aligned in regions with denser nanostructures. The number and average volume of the aligned droplets in these regions were larger than that of the droplets in the surrounding areas. However, nucleation in cavities subsequently caused initial pinning of the droplet base within the nanostructures, forming a balloonlike, slightly elongated droplet shape. The dewetting transition of the pinned droplets from the Wenzel state to the unpinned Cassie state was predicted by quantifying the aspect ratio of droplets ranging from 3 to 30 μm. Moreover, the coalescence-jumping of droplets was followed by a new cycle of droplet condensation in an aligned pattern in an emptied area. These findings offer guidelines for designing enhanced superhydrophobic surfaces for water and energy applications.

HOT WATER-REPELLENT SUPERHYDROPHOBIC SURFACES WITH LONG-TERM STABILITY

2021 ◽  
Author(s):  
JI SEONG CHOI ◽  
SEONG MIN KANG
Keyword(s):  
Hot Water ◽  
Superhydrophobic Surfaces ◽  
Water Repellent ◽  
Water Droplets ◽  
Long Term Stability ◽  
Cassie State ◽  
Potential Applications ◽  
Different Temperatures ◽  
Temperature Water

In this paper, we fabricate and evaluate superhydrophobic surfaces with mushroom-shaped microstructures. Using a silicon master and polymer microstructure patterning, polydimethylsiloxane (PDMS) surfaces bearing mushroom-shaped structures with five different spacing ratios are prepared and tested with water droplets of different temperatures. The fabricated PDMS surfaces demonstrate superhydrophobicity even to high-temperature water droplets with decreased surface tension. We compare the experimental data with the theoretical results calculated based on the Cassie state and Eötvös rule. Our work suggests potential applications to control wettability with liquids of various temperatures.

scholarly journals Mechanical Durability of Engineered Superhydrophobic Surfaces for Anti-Corrosion

Coatings ◽  
2018 ◽  
Vol 8 (5) ◽  
pp. 162 ◽  
Author(s):  
Divine Sebastian ◽  
Chun-Wei Yao ◽  
Ian Lian
Keyword(s):  
Superhydrophobic Surfaces ◽  
Mechanical Durability
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