Complete Spreading of Liquid Droplets on Heterogeneous Substrates: Simulations and Experiments
Science Direct Working Paper No S1574-0331(04)70337-9
21 Pages Posted: 31 May 2017 Last revised: 16 Dec 2017
Date Written: September 2000
We report the results of molecular dynamics (MD) simulations probing the spreading of a chain-like liquid droplet on heterogeneous substrates. A comparison is carried out between patterned and random substrates made of A and B materials. The simulations show that the spreading rate of the liquid droplet is a monotonous function of the heterogeneity concentration. The spreading of low molecular weight silicon oils (PDMS) on heterogeneous substrates has also been experimentally studied using high resolution spectroscopic ellipsometry. Two types of substrates were investigated : partially OTS-grafted silicon wafers and silicon wafers whose coating was a two-component grafted layer (UTS and uUTS). In the former case, the reaction time was varied to change the heterogeneity concentration at the wafer surface, while in the later, the relative concentrations of the coating constituents in the grafting solution were modified. The experimental results are in close agreement with the theoretical predictions of the MD simulations.
Keywords: Physical Chemistry > Computational Chemistry, physchem/0009001
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