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The morphological phase transition between a sessile and lenticular shapes ofa droplet placed in a nanochannel is observed upon increasing the dropletvolume. The phase diagram for this system is discussed within the macro- andmesoscopic approaches. On the mesoscopic level, the van der Waals forces aretaken into account via the effective interface potential acting between thechannel walls and the droplet. We discuss the contact angle dependence on thedroplet volume and the distance between the walls; this angle turns out to besmaller than the macroscopic Young's angle. The droplet presence induces thesolvation force acting between the channel walls. It can be both attractive andrepulsive, depending on the width of the channel.

The influence of van der Waals forces on droplet morphological transitions and solvation forces in nanochannels