TY - JOUR
T1 - Interaction and Adhesion Properties of Polyelectrolyte Multilayers
AU - Gong, Haofei
AU - Garcia-Turiel, Javier
AU - Vasilev, Krasimir
AU - Vinogradova, Olga I.
PY - 2005/8/1
Y1 - 2005/8/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=23844496492&partnerID=8YFLogxK
U2 - 10.1021/la051045m
DO - 10.1021/la051045m
M3 - Article
AN - SCOPUS:23844496492
SN - 0743-7463
VL - 21
SP - 7545
EP - 7550
JO - Langmuir
JF - Langmuir
IS - 16
ER -