![Sample our Physical Sciences journals, sign in here to start your FREE access for 14 days]({"type":"image" , "src" : "/sda/110819/TOC-Subject-Sample-2021-Physical-Sciences.jpg"})
Abstract
The dynamic surface wetting kinetics of sessile water and ethylene glycol droplets deposited on ink-jet papers was studied. The hydrodynamic and molecular-kinetic models were used for data analysis and the results were compared with each other. Hoffman–Tanner plots gave good linear fits with experimental data, but only the low velocity linear data fit correlated well with experimentally determined pseudo-equilibrium contact angles. The molecular-kinetic model gave a good non-linear fit with experimental data and produced physically meaningful values for the molecular parameters. A high rate wetting phase was found for some liquid-paper sample systems, which was correlated to capillary flow in 'micro-crack' surface structures. Deviation in low rate wetting behaviour from the hydrodynamic and molecular-kinetic models cannot solely be explained by surface structure and roughness. Consequently, it can be assumed that surface chemistry has a significant effect on wetting dynamics.
