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Exact and Monte Carlo study of adsorption of a self-interacting polymer chain for a family of three-dimensional fractals

S. Elezovic-Hadzic·I. Zivic·S. Milosevic
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Abstract

We study the problem of adsorption of self-interacting linear polymers situated in fractal containers that belong to the three-dimensional (3d) Sierpinski gasket (SG) family of fractals. Each member of the 3d SG fractal family has a fractal impenetrable 2d adsorbing surface (which is, in fact, 2d SG fractal) and can be labelled by an integer $b$ ($2\le b\le\infty$). By applying the exact and Monte Carlo renormalization group (MCRG) method, we calculate the critical exponents $ν$ (associated with the mean squared end-to-end distance of polymers) and $ϕ$ (associated with the number of adsorbed monomers), for a sequence of fractals with $2\le b\le4$ (exactly) and $2\le b\le40$ (Monte Carlo). We find that both $ν$ and $ϕ$ monotonically decrease with increasing $b$ (that is, with increasing of the container fractal dimension $d_f$), and the interesting fact that both functions, $ν(b)$ and $ϕ(b)$, cross the estimated Euclidean values. Besides, we establish the phase diagrams, for fractals with $b=3$ and $b=4$, which reveal existence of six different phases that merge together at a multi-critical point, whose nature depends on the value of the monomer energy in the layer adjacent to the adsorbing surface.

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S. Elezovic-Hadzic, I. Zivic, S. Milosevic. 2002-12-06. Exact and Monte Carlo study of adsorption of a self-interacting polymer chain for a family of three-dimensional fractals. https://doi.org/10.1088/0305-4470%2F36%2F5%2F303

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