1211.2196 (Jose G. Sampayo et al.)

Evidence for the role of fluctuations in the thermodynamics of nanoscale
drops and the implications in computations of the surface tension    [PDF]

Jose G. Sampayo, Alexandr Malijevsky, Erich A. Muller, E. de Miguel, G. Jackson

Test area deformations are used to analyse vapour-liquid interfaces of Lennard-Jones particles by molecular dynamics simulation. For planar vapour-liquid interfaces the change in free energy is captured by the average of the corresponding change in energy, the leading-order contribution. This is consistent with the commonly used mechanical (pressure tensor) route for the surface tension. By contrast for liquid drops one finds a large second-order contribution associated with fluctuations in energy. Both the first- and second-order terms make comparable contributions, invalidating the mechanical relation for the surface tension of small drops. The latter is seen to increase above the planar value for drop radii of ~8 particle diameters, followed by an apparent weak maximum and slow decay to the planar limit, consistent with a small negative Tolman length.

View original: http://arxiv.org/abs/1211.2196