Soft and Living Matter Seminar: Friday, November 22th, 2019: Polyelectrolyte Conformation Controlled by a Trivalent-Rich Ion Jacket

Event Date: 

Friday, November 22, 2019 - 1:30pm

Event Location: 

  • Elings 1601
  • Soft and Living Matter Seminars

The configuration of charged polymers is heavily dependent on interactions with surrounding salt ions, typically manifesting as a sensitivity to the bulk ionic strength. Here, we use single-molecule mechanical measurements to show that a charged polysaccharide, hyaluronic acid, shows a surprising regime of insensitivity to ionic strength in the presence of trivalent ions. Using simulations and theory, we propose that this is caused by the formation of a “jacket” of ions, tightly associated with the polymer, whose charge (and thus effect on configuration) is robust against changes in solution composition. 

Sarah Innes-Gold, UCSB