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Polyelectrolyte Conformation Controlled by a Trivalent-Rich Ion Jacket

Journal Article · · Physical Review Letters
 [1];  [1];  [2];  [1]
  1. Univ. of California, Santa Barbara, CA (United States)
  2. Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA (United States)

The configuration of charged polymers is heavily dependent on interactions with surrounding salt ions, typically manifesting as a sensitivity to the bulk ionic strength. In this work, we use single-molecule mechanical measurements to show that a charged polysaccharide, hyaluronic acid, reflects an interesting 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.

Research Organization:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF)
Grant/Contract Number:
AC04-94AL85000; NA0003525
OSTI ID:
1574458
Report Number(s):
SAND--2019-12489J; 680392
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 18 Vol. 123; ISSN 0031-9007; ISSN PRLTAO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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