Abstract
Polyelectrolytes are abundant in nature and crucial due to their versatility in biological systems. The controlled assembly of polyelectrolytes has potential applications in the formation of nanostructured and microstructured materials of desired structure and functionality. Dendrimers are a special class of polyelectrolytes, which are characterized by their densely branched and well-defined spherical geometry. Amino-terminal dendrimers resemble spheres, whose uniform surface charge densities can be continuously modulated by pH or ionic strength. The present study focuses on the dendrimer monolayer structure on gold surfaces. We used multiparametric surface plasmon resonance (MP-SPR) and a quartz crystal microbalance with dissipation energy monitoring (QCM-D) to investigate the conformational behavior of the sixth generation of PAMAM molecules. Both the kinetics of dendrimer deposition and the maximum surface concentration were determined. The dependence of the maximum coverage on the pH, ionic strength, ...
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