Adsorption of End-Functionalized Polystyrene on Model Textured Surfaces

N. Singh, A. Karim, F. S. Bates, M. Tirrell, K. Furusawa

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35 Scopus citations


Adsorption of iminium ion end-functionalized polystyrene on model rough surfaces has been investigated. The model surfaces were prepared by spin coating a solution of colloidal silica beads on aluminumcoated silicon surfaces. Atomic force microscopy and scanning electron microscopy of the surfaces revealed a nearly hexagonal packing of beads. Static secondary ion mass spectroscopy and X-ray photoelectron spectroscopy have been used to measure relative changes in the adsorbed amounts on the model surfaces compared to a flat surface. We observe a significant enhancement of adsorption when the bead to polymer radius (ρ/Rg) is of order unity. For ρ/Rg ≫1, the adsorbed amounts approach that on the smooth surfaces, whereas for ρ/Rg< 1, the adsorption is substantially reduced. The enhancement in adsorption is interpreted as a favorable reduction in crowding or stretching energy on adsorption, whereas the reduction is understood in terms of topologically induced steric hindrance to adsorption.

Original languageEnglish (US)
Pages (from-to)2586-2594
Number of pages9
Issue number9
StatePublished - Apr 1 1994


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