Abstract
Abstract Rhodamine B-labeled poly(ethylene imine) (PEIR) was synthesized and characterized using UV–vis spectroscopy, dynamic light scattering (DLS) and combining electrophoresis with laser Doppler velocimetry (LDV). DLS studies indicated a mean hydrodynamic diameter of 8.3 nm in the presence of 10−2 M NaCl. Electrophoretic mobility studies confirmed that PEIR remained cationic for pH below 10. The kinetics of PEIR adsorption and desorption onto mica was determined by in situ streaming potential measurements. The variations of zeta potential of PEIR-coated mica were quantitatively interpreted using a 3D electrokinetic model. In contrast, a mean-field (Gouy–Chapman) model proved inadequate. The acid–base characteristics of adsorbed PEIR layers were determined via streaming potential measurements over a broad pH range. The kinetics of PEIR desorption was also assessed. The deposition of well-defined adsorbed layers of PEIR onto planar substrates can be utilized to assess the kinetics of binding of various ligands.
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