Abstract
The effective Hamiltonian Hcap for a liquid–vapor interface is constructed by using the “experimental” direct correlation function obtained from molecular-dynamics simulation. The density fluctuation is parametrized according to: (a) The standard shift of the density profile, parallel and small; (b) the parallel shift; and (c) the shift with rotation as recently introduced, used in a density functional theory and compared with experiment. We find a universal shape of Hcap, discussed in some detail. The shape strongly suggests the existence of two regions of low wave-vector q and of high q corresponding to microscopic distances. Although bending and nonzero curvature of the fluctuating interface are present, the apparent bending (rigidity) coefficient is always negative, thus supporting the contention that the membrane Hamiltonians are not applicable to normal liquid–vapor interfaces. Several definitions of the momentum-dependent surface tension are also discussed.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
