Modelling the adsorption of partially aminated dendrimer monolayers

We develop two modifications of the Random Sequential Adsorption (RSA) model for capturing the adsorption kinetics and final surface layer geometry of partially aminated dendrimers. These modified models incorporate several of the features which distinguish the adsorption behaviour of partially aminated dendrimers from that of previously studied dendrimers with a homogenously distributed charge. In the first modification, dendrimer shaped objects are placed with the intersection between attempted placements and existing placements being checked only at a certain fraction of end groups. In the second, disks are placed with an effective radius representing electrostatic repulsion effects but are also able to overlap up to a specified degree. These models are applied towards interpretation of experimental adsorption results of a recent dendrimer of interest, dendritic polyglycerol amine (dPGA).