Metastable wetting model of electrospun mats with wrinkled fibers

2021 ◽  
pp. 149147
Author(s):  
Amit Rawal ◽  
Siddharth Shukla ◽  
Sumit Sharma ◽  
Danvendra Singh ◽  
Yi-Min Lin ◽  
...  
Keyword(s):  
Wetting Model

scholarly journals Research and Prediction of Wettability of Irregular Square Column Structure on Polymethyl Methacrylate (PMMA) Surface Prepared by Femtosecond Laser

Coatings ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 529
Author(s):  
Bangfu Wang ◽  
Juan Song
Keyword(s):  
Contact Angle ◽  
Femtosecond Laser ◽  
Prediction Model ◽  
Polymethyl Methacrylate ◽  
Groove Width ◽  
Complete Wetting ◽  
Column Structure ◽  
Pmma Surface ◽  
Incomplete Wetting ◽  
Wetting Model

Based on the contact angle prediction model of a traditional square column structure, the prediction models for wettability of a parallelogram square column structure (PSCS) on polymethyl methacrylate (PMMA) surface prepared by femtosecond laser were established. An experiment was conducted to analyze the rationality of the established complete wetting model and incomplete wetting model. It was found that the incomplete wetting prediction model of the square column structure was more in line with the actual situation. For PSCS, the length of both the long and short sides of the boss and the width of the groove exerted an impact on the contact angle prediction results. Under the condition that the length of the long and short sides of the boss remained unchanged and the groove width increased, the contact angle increased under complete wetting and incomplete wetting. In contrast, under the condition that the long side length of the boss and the groove width remained unchanged and the short side length of the boss increased, the contact angle increased under complete wetting but decreased under incomplete wetting. The maximum contact angle reached 135.65°, indicating that PSCS on PMMA surface enhanced the surface hydrophobicity of the material.

Bi-Gaussian Stratified Wetting Model on Rough Surfaces

Langmuir ◽  
2019 ◽  
Vol 35 (17) ◽  
pp. 5967-5974 ◽  
Author(s):  
Songtao Hu ◽  
Tom Reddyhoff ◽  
Debashis Puhan ◽  
Sorin-Cristian Vladescu ◽  
Weifeng Huang ◽  
...  
Keyword(s):  
Rough Surfaces ◽  
Wetting Model

Lattice Boltzmann Simulation of Particle Motion in Binary Immiscible Fluids

2015 ◽  
Vol 18 (3) ◽  
pp. 757-786 ◽  
Author(s):  
Yu Chen ◽  
Qinjun Kang ◽  
Qingdong Cai ◽  
Moran Wang ◽  
Dongxiao Zhang
Keyword(s):  
Lattice Boltzmann ◽  
Particle Motion ◽  
Mass Conservation ◽  
Immiscible Fluids ◽  
Lattice Boltzmann Model ◽  
Lattice Boltzmann Simulation ◽  
Suspension Model ◽  
Wetting Model ◽  
Boltzmann Model ◽  
The Impact

AbstractWe combine the Shan-Chen multicomponent lattice Boltzmann model and the link-based bounce-back particle suspension model to simulate particle motion in binary immiscible fluids. The impact of the slightly mixing nature of the Shan-Chen model and the fluid density variations near the solid surface caused by the fluid-solid interaction, on the particle motion in binary fluids is comprehensively studied. Our simulations show that existing models suffer significant fluid mass drift as the particle moves across nodes, and the obtained particle trajectories deviate away from the correct ones. A modified wetting model is then proposed to reduce the non-physical effects, and its effectiveness is validated by comparison with existing wetting models. Furthermore, the first-order refill method for the newly created lattice node combined with the new wetting model significantly improves mass conservation and accuracy.

Dynamic wetting model for the isotropic-to-nematic transition over a flat substrate

Soft Matter ◽  
2014 ◽  
Vol 10 (10) ◽  
pp. 1611 ◽  
Author(s):  
Alejandro D. Rey ◽  
E. E. Herrera-Valencia
Keyword(s):  
Dynamic Wetting ◽  
Flat Substrate ◽  
Wetting Model

A Nonlinear Wall-Wetting Model for the Complete Operating Region of a Sequential Fuel Injected SI Engine

2000 ◽  
Author(s):  
Michael R. Simons ◽  
Marzio Locatelli ◽  
Christopher H. Onder ◽  
Hans P. Geering
Keyword(s):  
Si Engine ◽  
Operating Region ◽  
Wall Wetting ◽  
Wetting Model

scholarly journals Investigation and Prediction on Regulation of Hydrophobicity of Polymethyl Methacrylate (PMMA) Surface by Femtosecond Laser Irradiation

Coatings ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 386
Author(s):  
Bangfu Wang ◽  
Yongkang Zhang ◽  
Juan Song ◽  
Zhongwang Wang
Keyword(s):  
Contact Angle ◽  
Femtosecond Laser ◽  
Prediction Model ◽  
Laser Irradiation ◽  
Structural Parameters ◽  
Edge Length ◽  
Contact Angles ◽  
Groove Structure ◽  
Incomplete Wetting ◽  
Wetting Model

This study presents the contact angle prediction model of a trapezoidal groove structure based on the laser irradiation on polymethyl methacrylate (PMMA). The trapezoidal groove structure was designed and proposed according to the characteristics of a femtosecond laser. First, the complete wetting model and incomplete wetting model which were compatible with the characteristics of the laser mechanism were constructed based on the Gibbs free energy and the structural parameters of the trapezoidal groove structure. Then, based on the contact angle prediction models constructed, the samples were divided into two groups according to the designed structural parameters, and the experimental investigations were carried out. The result demonstrated that the incomplete wetting prediction model was more in line with the actual situation. The convex width and the top edge length of spacing of the trapezoidal groove structure both affected the contact angle prediction results. From both the experimental contact angles and the contact angles predicted by the incomplete wetting model, it could be known that the contact angle reached 138.09° when the ratio of the convex width to the top edge length of spacing was 0.25, indicating that the smaller the ratio of the convex width to the top edge length of spacing, the better the hydrophobicity of PMMA.

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.

Sign in / Sign up

Export Citation Format

Share Document