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We investigate the complexation of star-shaped polyelectroltyes (PEs) on oppositely charged colloids. Using Molecular Dynamics simulations, we study the chain adsorption on the colloidal surface at fixed size aspect ratio between star and colloid of around 0.6. Depending on the charge ratio between the colloid and the PE star, we observe a variety of star morphologies that were also observed in a recent work of stars on oppositely charged planar surfaces [M. Konieczny and C. N. Likos, Soft Matter  3 , 1130 (2007)]. Another important parameter is the PE star functionality that determines the crossover areas for the various star structures. The morphologies are characterized by the degree of chain adsorption and their orientation with respect to the colloid center. An orientational parameter allows us to identify the various morphologies that range from partial chain adsorption to complete adsorption for which a “starfish” configuration is identified. We present a conformational phase diagram that summarizes the three dominant structures in the parameter space built up from the star functionality and the star-colloid charge ratio.

Complexation of charged colloids with polyelectrolyte stars