Molecular Dynamics Simulation of Nanodroplets Impacting Stripe-Textured Surfaces

R Li and PZ Zhu and ZH Yin and YM Xu, LANGMUIR, 38, 7058-7066 (2022).

DOI: 10.1021/acs.langmuir.2c00770

The dynamic behavior of droplets impacting on textured surfaceshas an important influence on many engineering applications, such as anti- icingand self-cleaning. However, the mechanism and law of the effect of texturedsurfaces on the impact behavior of nanodroplets has not been fully revealed yet.In this paper, the molecular dynamics (MD) method is used to model thedynamic behavior of nanodroplets after impacting the solid surface with a stripedtexture. The influences of texture gap and texture angle on the real contact area,spreading factor, contact time, and bounce velocity of the droplet after impactare also quantitatively analyzed. It is shown that the striped texture producessignificant anisotropy in the spreading and contraction behavior of nanodropletsafter impact, and the anisotropy is more pronounced on the ridged texturesurface than on the grooved texture surface. In addition, wefind that the texturegap has little effect on the dynamic behavior of nanodroplets impacting thetextured surface. However, as the bottom angle of the texture increases, the realcontact area and bounce velocity of the nanodroplet increase significantly, while the contact time and spreading factor decrease. Thiswork further elucidates the characteristics and mechanisms of nanodroplets impacting on stripe- textured surfaces and provides atheoretical basis for the design of nanostructured surfaces in relevant applications.

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