Coalescence of sessile polymer droplets: A molecular dynamics study

Abstract

Droplet coalescence is ubiquitous in nature and the same time key to various technologies, such as inkjet printing. Here, we report on the coalescence of polymer droplets with different chain lengths coalescing on substrates of different wettability. By means of molecular dynamics simulations of a coarse-grained model, it is found that the rate of bridge growth is higher in the case of droplets with smaller contact angles (more wettable substrates) and decreases with the increase of the chain length of the polymers. Different behavior has also been identified in the dynamics of the approach of the two droplets during coalescence with the substrate wettability playing a more important role compared to the chain length of the polymers. While the dynamics of the droplet are greatly affected by the latter parameters, the density profile and flow patterns remain the same for the different cases. Thus, we anticipate that our work provides further insights into the coalescence of liquid polymer droplets on solid substrates with implications for relevant technologies.

arXiv comment10 pages, 5 figures

References in corpus (13)

• Coalescence of Liquid Drops
• Inviscid coalescence of drops
• Coalescence of bubbles and drops in an outer fluid
• The inexorable resistance of inertia determines the initial regime of drop coalescence
• Coalescence of Liquid Drops: Different Models Versus Experiment
• Symmetric and Asymmetric Coalescence of Drops on a Substrate
• Approach and Coalescence of Liquid Drops in Air
• Correlation between surface topography and slippage: a Molecular Dynamics study
• Bridge evolution during the coalescence of immiscible droplets
• Stiffness-guided motion of a droplet on a solid substrate
• Rugotaxis: Droplet motion without external energy supply
• Unidirectional Droplet Propulsion onto Gradient Brushes without External Energy Supply
• Off-lattice Monte-Carlo approach for studying nucleation and evaporation phenomena at the molecular scale

Cited by in corpus (4)

• Coalescence of surfactant-laden droplets
• Molecular dynamics simulation of the coalescence of surfactant-laden droplets
• Coalescence of sessile aqueous droplets laden with surfactant
• Collision of surfactant-laden droplets: insights from molecular dynamics simulation