Abstract
We identify the nucleation pathway for a liquid droplet of a water-like system. In order to calculate the free energy barrier associated with the droplet formation, we use the recently developed μVT-S simulation method to unravel the nucleation process. We analyze the interdependence between droplet size, entropy and free energy of nucleation. Three key features emerge: the droplet size increases as entropy decreases during the process, the nucleation free energy increases as supersaturation decreases, and the nucleation free energy increases as T decreases. This method can be readily applied to calculate free energy barriers of activated events with entropy as the reaction coordinate.
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