The van der Waals-Cahn-Hilliard functional consists of a gradient-square term and a double-well potential term of an underlying phase-field function. It is a prototype model of a diffuse interface, and is known to Gamma-converge to its sharp-interface limit. In this talk, I will give a definition of the related force, and prove its convergence to the corresponding sharp-interface limit. I will also describe the extension of the result to a phase-field model for molecular solvation. This is joint work with Shibin Dai and Jianfeng Lu.

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