Wettability behavior of nanodroplets on copper surfaces with hierarchical nanostructures

Zhang, Mingya; Ma, Liyun; Wang, Qing; Hao, Peng; Zheng, Xu

doi:10.1016/j.colsurfa.2020.125291

Cited by 40 publications

(16 citation statements)

References 39 publications

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“…This is because the newly exposed TP powders and SiO 2 particles combined with PDMS, allowing the newly formed surface to have low surface free energy and micro/nano roughness simultaneously. [ 32 ] In short, a new superhydrophobic surface formed on the surface of the coating after each abrasion cycle, endowing mechanical robustness to the BLTP/PDMS coating. Other nonuniform abrasion and impact damage were also investigated, and the results are shown in Figure and Movie S3, Supporting Information.…”

Section: Resultsmentioning

confidence: 99%

Fabrication and Properties of Thermochromic Superhydrophobic Coatings

et al. 2021

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Herein, thermochromic superhydrophobic coatings (TSCs) with different colors are prepared, and their surface wettabilities and optical properties are studied. The TSC coating maintains its surface superhydrophobicity even after a series of mechanical damage (sandpaper abrasion, gravel impact, and knife scratching), chemical corrosion, ultraviolet aging, and environmental temperature changes. Contaminants on the surface of the coating sre easily washed by water droplets. The TSC has a reversible color function with a critical discoloration temperature (T c ) approximately in the range 28-31 C. In winter, the ambient temperature (T a ) is lower than T c , and the TSC is dark and absorbs more solar energy. Although in summer, T a > T a , the TSC is light and reflects more solar energy. The sunlight exposure test shows that the surface temperature of the thermochromic pigment/polydimethylsiloxane (TP/PDMS) coating in winter is only 0.9 C lower than that of the carbon black/PDMS (CB/PDMS) coating, whereas in summer, the surface temperature of the TP/PDMS coating is only 6.2 C higher than that of TiO 2 /PDMS coating. Energy consumption simulation results show that the TP/PDMS coating decreases the total annual energy consumption in North China by 13.74% compared with the traditional white cooling coating.

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Section: Resultsmentioning

confidence: 99%

Fabrication and Properties of Thermochromic Superhydrophobic Coatings

et al. 2021

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“…The initial configuration of water nanodroplets impinging on a moving surface is schematically shown in Figure 1. The flat substrate is composed of copper atoms, which are arranged in the face-centered-cube (FCC) structure with a lattice constant of 3.615 Å [34]. A TIP4P model of water is adopted because it can present more accurate dynamical characteristics [35,36].…”

Section: Simulation Model and Methodologymentioning

confidence: 99%

“…The cutoff distances of 12-6 LJ potential and Coulomb potential are 10 Å and 12 Å [34], respectively. Velocity-Verlet algorithm is used to integrate the Newton equation of motion and update the velocities and coordinates of atoms with a time step of 1.0 fs.…”

Section: Simulation Model and Methodologymentioning

confidence: 99%

Molecular Dynamics Simulation on Behaviors of Water Nanodroplets Impinging on Moving Surfaces

2022

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Droplets impinging on solid surfaces is a common phenomenon. However, the motion of surfaces remarkably influences the dynamical behaviors of droplets, and related research is scarce. Dynamical behaviors of water nanodroplets impinging on translation and vibrating solid copper surfaces were investigated via molecular dynamics (MD) simulation. The dynamical characteristics of water nanodroplets with various Weber numbers were studied at four translation velocities, four vibration amplitudes, and five vibration periods of the surface. The results show that when water nanodroplets impinge on translation surfaces, water molecules not only move along the surfaces but also rotate around the centroid of the water nanodroplet at the relative sliding stage. Water nanodroplets spread twice in the direction perpendicular to the relative sliding under a higher surface translation velocity. Additionally, a formula for water nanodroplets velocity in the translation direction was developed. Water nanodroplets with a larger Weber number experience a heavier friction force. For cases wherein water nanodroplets impinge on vibration surfaces, the increase in amplitudes impedes the spread of water nanodroplets, while the vibration periods promote it. Moreover, the short-period vibration makes water nanodroplets bounce off the surface.

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“…Moreover, the surface chemical compositions and hierarchical microstructures can further enhance the performance of liquid repelling. [ 53 ] At present, the fabrication of artificial superhydrophobic surfaces mainly follows three routes: constructing sufficient roughness on the surface of low‐surface‐energy materials; reducing the surface energy of materials with sufficient roughness; creating rough structures on the surface of materials combined with hydrophobic treatment to reduce the surface energy. So far, various techniques, including physical and chemical methods, have been proposed for fabricating artificial superhydrophobic surfaces by controlling the two parameters and following the three routes.…”

Section: Superhydrophobic Surfacesmentioning

confidence: 99%