Title: A model study of cooperative binding of ionic surfactants to oppositely charged flexible polyions
Author(s):

	T. Nishio (Department of Integrated Human Sciences (Physics), Hamamatsu University School of Medicine, Hamamatsu 431-3192, Japan) ,
	T. Shimizu (Department of Electronic and Information System Engineering, Faculty of Science and Technology, Hirosaki University, Hirosaki 036-8561, Japan) ,
	Sh. Yoshida (Department of Integrated Human Sciences (Physics), Hamamatsu University School of Medicine, Hamamatsu 431-3192, Japan) ,
	A. Minakata (Department of Integrated Human Sciences (Physics), Hamamatsu University School of Medicine, Hamamatsu 431-3192, Japan)

A novel statistical model for the cooperative binding of monomeric ligands to a linear lattice is developed to study the interaction of ionic surfactant molecules with flexible polyion chain in dilute solution. Electrostatic binding of a ligand to a site on the polyion and hydrophobic associations between the neighboring bound ligands are assumed to be stochastic processes. Ligand association separated by several lattice points within defined width is introduced for the flexible polyion. Model calculations by the Monte Carlo method are carried out to investigate the binding behavior. The hypothesis on the ligand association and its width on the chain are of importance in determining critical aggregation concentration and binding isotherm. The results are reasonable for the interpretations of several surfactant-flexible polyion binding experiments. The implications of the approach are presented and discussed.

Key words: ionic surfactant-flexible polyion interaction, lattice of linear polyion, cooperative binding of ligands, binding isotherm, association width, model calculation
PACS: 36.20.Kd, 61.25.he, 82.60.Hc, 82.70.Uv, 87.10.Mn, 87.16.A-

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