Wetting Transition from the Cassie–Baxter State to the Wenzel State on Textured Polymer Surfaces

Langmuir ◽  
2014 ◽  
Vol 30 (8) ◽  
pp. 2061-2067 ◽  
Author(s):  
Daiki Murakami ◽  
Hiroshi Jinnai ◽  
Atsushi Takahara
Keyword(s):  
Polymer Surfaces ◽  
Wetting Transition ◽  
Wenzel State

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.

Cassie–Baxter to Wenzel state wetting transition: a 2D numerical simulation

RSC Advances ◽  
2013 ◽  
Vol 3 (46) ◽  
pp. 24530 ◽  
Author(s):  
Daisiane M. Lopes ◽  
Stella M. M. Ramos ◽  
Luciana R. de Oliveira ◽  
José C. M. Mombach
Keyword(s):  
Numerical Simulation ◽  
Wetting Transition ◽  
Wenzel State ◽  
2D Numerical Simulation

scholarly journals Dynamic Wetting Behavior of Vibrated Droplets on a Micropillared Surface

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Zhi-hai Jia ◽  
Wei Lei ◽  
Hui-nan Yang ◽  
Gang Wang
Keyword(s):  
Model Calculation ◽  
Water Droplet ◽  
Vertical Vibration ◽  
Wetting Transition ◽  
Compression Process ◽  
Dynamic Wetting ◽  
Wetting Behavior ◽  
Cassie State ◽  
Wenzel State

The dynamical wetting behavior has been observed under vertical vibration of a water droplet placed on a micropillared surface. The wetting transition takes place under the different processes. In compression process, the droplet is transited from Cassie state to Wenzel state. The droplet undergoes a Wenzel-Cassie wetting transition in restoring process and the droplet bounces off from the surface in bouncing process. Meanwhile, the wetting and dewetting models during vibration are proposed. The wetting transition is confirmed by the model calculation. This study has potential to be used to control the wetting state.

Controlling wetting properties on nanostructure surfaces by the coupled effect of the structural parameter and roughness factor

2020 ◽  
Vol 16 ◽  
Author(s):  
Pengcheng Shi ◽  
Yan Lu ◽  
Peng Liu
Keyword(s):  
Contact Angle ◽  
Structural Parameters ◽  
Strong Dependence ◽  
Hydrophobic Surface ◽  
Wetting Transition ◽  
Structural Parameter ◽  
Roughness Factor ◽  
Pillar Height ◽  
Wetting Properties ◽  
Wenzel State

Aims: The wetting properties of the nanostructure surface can be controlled by the structural parameter associate with roughness surface. Background: Increasing the roughness of hydrophobic surface can enhance the hydrophobicity of the surface. Objective: We chose copper material modified by fluorosilane as the substrate, and used Lammps software to establish four different shapes nanostructures, square pillar, cylinder, frustum and cone nanostructure respectively with pillar height and theoretical gap changing to study the influence of structural parameter and roughness factor on wetting properties of surfaces. Method: Molercular dynamic simulation Result: The structural parameter h/b can determine the wetting transition of the droplet on surfaces. With the same height and theoretical gap, the contact angle of the frustum and the cone surfaces is larger than that of the square pillar surfaces and cylinder surfaces due to the effect of wedge surface. Conclusion: (1)The values of the contact angle exhibit a strong dependence on roughness factor. The roughness factor will increase by this way of increasing height and decreasing gap, and the contact angle of droplet increase with the roughness factor increasing on the four surfaces. There exists the critical structural parameter h/b to determine the Cassie and Wenzel state transition of the droplet on various nanostructure surfaces.And the critical structural parameter values are 1.5, 1.5, 2.08 and 2.24 for the square pillar, cylinder, frustum and cone nanostructures respectively. Other: The wetting properties can be controlled by the structural parameter associate with the roughness factor. Increasing the pillar height and decreasing the gap of the nanostructure surfaces will make the structural parameters reach the standard of transition value h/b of the droplet state, and the droplet will change from Wenzel state to Cassie state.

Cassie-Baxter to Wenzel state wetting transition: Scaling of the front velocity

2009 ◽  
Vol 29 (4) ◽  
pp. 391-397 ◽  
Author(s):  
A. M. Peters ◽  
C. Pirat ◽  
M. Sbragaglia ◽  
B. M. Borkent ◽  
M. Wessling ◽  
...  
Keyword(s):  
Front Velocity ◽  
Wetting Transition ◽  
Wenzel State

Direct synthesis of electrowettable nanostructured hybrid diamond

2019 ◽  
Vol 7 (32) ◽  
pp. 19026-19036
Author(s):  
Sujit Deshmukh ◽  
Kamatchi Jothiramalingam Sankaran ◽  
Debosmita Banerjee ◽  
Chien-Jui Yeh ◽  
Key-Chyang Leou ◽  
...  
Keyword(s):  
Low Voltage ◽  
Direct Synthesis ◽  
Wetting Transition ◽  
Core Shell ◽  
Wenzel State

A low-voltage wetting transition from the Cassie–Baxter state to the Wenzel state was achieved by preparing a needle-like conductive diamond–graphite core–shell nanostructure.

Conformal and non-conformal surface modification of honeycomb-patterned porous films via tunable Cassie–Wenzel transition

RSC Advances ◽  
2016 ◽  
Vol 6 (57) ◽  
pp. 52131-52136 ◽  
Author(s):  
Qi-Zhi Zhong ◽  
Xiang Yu ◽  
Ming-Xu Cui ◽  
Ling-Shu Wan ◽  
Zhi-Kang Xu
Keyword(s):  
Surface Modification ◽  
Wetting Transition ◽  
Porous Films ◽  
Robust Approach ◽  
Cassie State ◽  
Wenzel State

We describe here a facile and robust approach to conformal and non-conformal surface modification by tuning the wetting transition between the Wenzel state and the Cassie state.

Effects of Electrical Discharges in Low Pressure Gases on the Morphology of Polyethylene Crystals

1974 ◽  
Vol 32 ◽  
pp. 544-545
Author(s):  
L.H. Bolz ◽  
D.H. Reneker
Keyword(s):  
Power Distribution ◽  
Electrical Discharge ◽  
Dielectric Breakdown ◽  
Ionic Species ◽  
Low Pressure ◽  
Polymer Surfaces ◽  
Electrical Discharges ◽  
Adhesive Bonds ◽  
Power Distribution Lines ◽  
Modification Of The Surface

The attack, on the surface of a polymer, by the atomic, molecular and ionic species that are created in a low pressure electrical discharge in a gas is interesting because: 1) significant interior morphological features may be revealed, 2) dielectric breakdown of polymeric insulation on high voltage power distribution lines involves the attack on the polymer of such species created in a corona discharge, 3) adhesive bonds formed between polymer surfaces subjected to such SDecies are much stronger than bonds between untreated surfaces, 4) the chemical modification of the surface creates a reactive surface to which a thin layer of another polymer may be bonded by glow discharge polymerization.

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