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The kinetics of droplet and bridge formation within striped nano-capillariesis studied when the wetting film grows via interface-limited growth. Thephenomenological time-dependent Ginzburg-Landau (TDGL)-type model with thermalnoise is used and numerically solved using the cell dynamics method. The modelis two-dimensional and consists of undersaturated vapor confined within anano-capillary made of two infinitely wide flat substrates. The surface of thesubstrate is chemically heterogeneous with a single stripe of lyophilic domainthat exerts long-range attractive potential to the vapor molecule. The dynamicsof nucleation and subsequent growth of droplet and bridge can be simulated andvisualized. In particular, the evolution of the morphology from droplet or bumpto bridge is clearly identified. Crucial role played by the substrate potentialon the morphology of bridge of nanoscopic size is clarified. Nearlytemperature-independent evolution of capillary condensation is predicted whenthe interface-limited growth dominates. In addition, it is shown that thedynamics of capillary condensation follows the scenario of capillarycondensation proposed by Everett and Haynes three decades ago.

Cell dynamics simulation of droplet and bridge formation within striped nano-capillaries