The name is absent

surfaces.

3.5 Yu and Wu

Yu and Wu [61] extended the idea of using a weighted density approximation for
associating fluids from Segura et. al. [62] to freely jointed hard chain fluids. However
the density independent weights for calculating the weighted densities are based on
the Fundamental Measure Theory (FMT) of Rosenfeld [110].

The free energy functional for chain fluids is expressed as the sum of an ideal gas
term A^ld[pyv∕(r'^w)] and an excess term √1-^ej-^λc [pʌʃ(rʌʃ)] due to intra- and intermolecular
interactions.

A [pm (rʌʃ)] = A‰(γ^m)] + A^ex[_pm(t^m)].            (3.14)

Yu and Wu used the same ideal free energy functional as used by Woodward [111].
All monomers in a ideal chain are non-interacting, i.e. the chain is made up of point
monomers, where successive monomers in a given chain are held at a fixed separation
given by the bond length, σ , but otherwise are allowed full configurational freedom.
The free energy of such a random flight chain based on the molecular density рм(г^м')
is given as,

(3A^ld[p_M] = ʃ dr^Mp_M(r^M)[lnp_M(r^M) - 1] +β j dr^Mp_m(γ^m)⅛(γ^m),    (3.15)

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