#Uic inkdrop plus#
With the new model for Dmax plus the scaling found for tmax, we present a master curve collapsing the evolution of the nanometer drop contact diameter during impact for different wettabilities and different impact velocities. We also propose a new scaling for the time required to reach the maximal contact diameter tmax with respect to the impact velocity, which is also in agreement with the observations. We have developed a new model for Dmax that is in agreement with the simulation data and also takes into account the effects of the liquid-solid wettability. The comparison between the molecular dynamics simulations and different macroscopic models reveals that most of these models do not correspond to the simulation results at the nanoscale, in particular for the maximal contact diameter during the nanodroplet impact (Dmax). Using large scale molecular dynamics simulations, we study in detail the impact of nanometer droplets of low viscosity on flat substrates versus the wettability of the solid plate. Our study sheds light on the dependence of chain bending stiffness and temperature on the wetting behavior of polymer adhesive droplets, and offers insights, which, upon experimental validation can then be used for the design of adhesives or hydrogels. Interestingly, we observe such deterioration becomes more significant by both increasing the temperature and decreasing the bending stiffness. Detailed thermodynamic property analysis is further conducted, revealing that the adhesion between the polymer droplet and substrate deteriorates due to the decline of wettability. The results indicate the wettability is weakened by the increase of bending stiffness of polymer chain. The wetting dynamics and the contact angle are studied to show the evolution of morphology of droplets during the wetting process. To address this issue, here we utilize coarse-grained molecular dynamics (CGMD) simulations to systematically elucidate how the wettability of a polymer adhesive droplet on a surface depends on bending stiffness. While relationships between polymer microstructure and adhesion have been investigated in previous studies, it remains challenging to unveil the effect of polymer microstructure on wettability. The spreading of polymer adhesives on adherend is one of the essential considerations for the interfacial adhesion of polymer adhesives, which is strongly related to their wetting behaviors. Polymer adhesives are widely used in daily applications and in industry owing to their flexibility and overall non-toxicity, particularly in interfacial adhesion. The correlations were also found to be generally consistent with the experimentally observed spreading behavior of macroscopic droplets. Global kinetic energy and surface energy considerations were used to provide a physical basis for these correlations. The correlations indicated that the normalized spreading diameter and contact angle scale with drop diameter as Dm /D0 ∝D00.5 and θR ∝D00.5, while the advancing and receding time periods scale as t∝D02/3. These results were further analyzed to obtain correlations for the effect of droplet size on these spreading parameters. In addition, the simulation results indicated that the dynamic contact angle and spreading diameter, as well as the advancing and receding time periods, exhibit strong dependence on droplet size. The comparison based on the ratio of relevant time scales indicated that for the conditions investigated, the spreading dynamics is governed by inertial and surface forces, with negligible influence of viscous forces. The computational model was validated through qualitative comparison with the measurements of Bayer and Megaridis, and through comparison with existing correlations. The spreading behavior was analyzed in terms of the temporal evolution of the dynamic contact angle and spreading diameter for wettable, partially wettable and non-wettable surfaces. Molecular dynamics simulations were performed to study the spreading characteristics of nano-sized droplets on solid surfaces.
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