STRUCTURE OF IONS AND WATER AROUND APOLYELECTROLYTE IN A POLARIZABLE NANOPORE

摘要

We study the distribution of ions and water within a pore in a polarizable membrane,in the presence of a stiff polyelectrolyte threaded through the pore. In this system,which represents a typical situation during the translocation of DNA, the distribution ofboth the ions and the water molecules is affected by the induced charges on the surfaceof the polarizable nanopore. Specifically, the concentration of counterions is enhancednear the surface of the pore, due to the attractive interaction with the induced charges.Conversely, the water within the pore is depleted, as a result of the disruption of hydrogenbonds by the induced charges.