Figure 10.

Non-interactive random walk of one water molecule in a nanocavity. (a) The water molecule enters the cavity (yellow arrow) and then it collides with the inside walls of the spherical cavity (10 nm) several times (A–I points and blue lines) before escaping from the entrance-escape hole (3 nm, red line); (b) mean escape time for 10³ different random walk runs in 1 nm (green), 10 nm (red), 10² nm (blue), and 10³ nm (magenta) spherical cavities for different entrance-escape hole diameters (0.3 nm–500 nm). The y-axis represents a logarithmic time scale.