Abstract
It was recently reported that nano residual films could be left on smooth substrates after the dewetting of partially wetting non-volatile liquids. In this work we clarify the criteria for the residual film to form and to maintain stable on the substrate. Atomic force microscopy imaging indicated that the residual film formation was dependent on the system wettability. The residual film was investigated in molecular dynamics simulations and the results were consistent to the experiments. The disjoining pressure played an important role in determining the film stability. The results provide important guidance for long-standing puzzles about trace liquid after dewetting.
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