Nonequilibrium molecular dynamics of complex fluids near the gel point

Details Nonequilibrium molecular dynamics of complex fluids near the gel point Nonequilibrium molecular dynamics of complex fluids near the gel point

2005-06-06

arxiv.org/abs/cond-mat/0506123v1

Physics

Condensed Matter

Soft Condensed Matter

5 pages, 9 figures

Scientific paper

We have carried out nonequilibrium molecular dynamics simulations of a system of crosslinked particles under shear flow conditions. As the fraction of crosslinks $p$ is increased the system approaches a gel point at which the shear viscosity $\eta$ and the first and second normal stress coefficients $\Psi_1$ and $\Psi_2$ diverge. All three quantities seem to diverge with a power law form: $\eta\sim \epsilon^{-s}$, $\Psi_{1,2}\sim\epsilon^{-\lambda}$ where $\epsilon =p_c-p$ and $s\approx 0.7$ and $\lambda\approx 3.15$ in three dimensions and $s\approx 2.0$ and $\lambda\approx 6.0$ in two dimensions.

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