Temporal Changes of Adsorbed Layer Thickness and Electrophoresis of Polystyrene Sulfate Latex Particles after Long Incubation of Oppositely Charged Polyelectrolytes with Different Charge Densities

The different desorption concepts of the two polyelectrolytes PTMA5M and PTMC5M, which have similar molecular weights and differ in the charge density on the polystyrene sulfate latex (PSL) particles by 25 times, and with various charge densities in a long incubation, were systematically investigated based on hydrodynamic adsorbed layer thickness (delta(H)) and electrophoretic mobility (EPM) under two ionic strengths in the present study. Herein, in the case of highly charged polyelectrolyte PTMA5M, desorption continued for 4 h and re-adsorbing proceeded after a longer incubation time higher than 4 h. Meanwhile, in the case of lowly charged polyelectrolyte PTMC5M, an adsorption-desorption equilibrium was suggested to take into account the unchanging of both delta(H) and EPM.

Automated summary

In this study, the different desorption concepts of the two polyelectrolytes with similar molecular weights but significantly different charge densities on PSL particles were systematically investigated. For highly charged PTMA5M, desorption continued for 4 hours and re-adsorption proceeded after a longer incubation time, while for lowly charged PTMC5M, an adsorption-desorption equilibrium was observed.