Nano-droplet jumping due to surface wettability variation: molecular modeling approach

Abstract

The effect of substrate hydrophobicity on the dynamics of water nano-droplets is computationally studied utilizing the molecular dynamics method. It is observed that the droplet moves upward by increasing the...

Optimum substrate stiffness in coalescence-induced droplet jumping

“…Some studies have successfully tuned the jumping behaviors of the droplets by adjusting the parameters such as the number and size, 16 or by utilizing heterogeneous droplets. 17 A more commonly implemented strategy is to modulate the surface properties or morphology, such as surface wettability, 18 honeycomb bionic superhydrophobic surfaces, 19 mixed-wettability superhydrophobic surfaces, 20 micro-or nanoarray decorated surfaces, [21][22][23] hierarchical surface structures, [24][25][26] macrotexures, 15,27,28 etc. These microstructures, nature inspired or artificial, in general are designed to reduce the adhesion when the merged droplet detaches from the surface.…”

Direct Nanosecond Multiframe Imaging of Irreversible Dynamics in 4D Electron Microscopy

“…Using the single-shot multiframe methodology developed here, we succeeded in directly observing the entire melting/jumping processes of the same NP at ∼12 nm resolution and quantitatively describing such behaviors with the correction algorithm. Regarding the jumping process, several mechanisms have been proposed in the past years: (i) plasma-induced shockwave; , (ii) dewetting-induced detachment; , and (iii) coalescence-induced jumping. − The detachment and jumping of the NPs induced by the plasma-associated shockwave require the high-power short-pulse laser to trigger the process. According to a model of the nanosecond-laser-induced heat transfer between the Au NP and the SiN film (Figure S8), the simulation suggested that the temperature of the Au NP became ∼1400 K at a fluence of 36 mJ/cm 2 (Figure S9).…”