Interaction and Adhesion Properties of Polyelectrolyte Multilayers

Haofei Gong, Javier Garcia-Turiel, Krasimir Vasilev, Olga I. Vinogradova

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56 Citations (Scopus)

Abstract

The growth, morphology, and interaction/adhesion properties of supported poly(sodium 4-styrene-sulfonate)/poly(allylamine hydrochloride) (PSS/PAH) and DNA/PAH multilayers were investigated by means of surface plasmon resonance spectroscopy, atomic force microscope (ATM) imaging, and AFM-related force measurements. Multilayers were assembled on a prelayer of poly(ethylenimine) (PEI) both with and without drying. SPR results showed a linear growth of the assembly in the case of PSS/PAH multilayers and nonlinear growth for DNA/PAH multilayers. Measurements of forces acting between a bare glass sphere and a multilayer-coated surface indicated repulsive or attractive forces, depending on surface charge, which suggests that, on approach, electrostatic forces dominate. On separation, we observed large pull-off forces in the case of positively charged multilayers and weak pull-off forces in the case negatively charged multilayers. Multiple adhesions and plateau regions observed on separation were interpreted in terms of a bridging of multiple polymer chains between the glass particle and the multilayer and a stretching of the polyelectrolyte loops. The dependence of the pull-off force on the number of deposited layers shows regular oscillations.

Original languageEnglish
Pages (from-to)7545-7550
Number of pages6
JournalLangmuir
Volume21
Issue number16
DOIs
Publication statusPublished - 1 Aug 2005
Externally publishedYes

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