Influence of Kosmotrope and Chaotrope Salts on Water Structural Relaxation

Peng Luo, Yanqin Zhai, Erkan Senses, Eugene Mamontov, Guangyong Xu, Y Z, Antonio Faraone

Research output: Contribution to journalArticlepeer-review


The structural relaxation in water solutions of kosmotrope (structure maker) and chaotrope (structure breaker) salts, namely sodium chloride, potassium chloride, and cesium chloride, were studied through quasielastic neutron scattering measurements. We found that the collective dynamics relaxation time at the structure factor peak obtained using heavy water solutions shows a distinctively different behavior in the kosmotrope as opposed to the chaotrope solutions, increasing with the salt concentration in the former and decreasing in the latter. In both cases the trends are proportional to the concentration dependence of the relative viscosity of the solutions. These results indicate that kosmotropes and chaotropes influence the solution's viscosity by impacting in opposite ways the hydrogen bond network of water, strengthening it in one case and softening it in the other.

Original languageEnglish (US)
Pages (from-to)8970-8975
Number of pages6
JournalJournal of Physical Chemistry Letters
Issue number21
StatePublished - Nov 5 2020

ASJC Scopus subject areas

  • Materials Science(all)
  • Physical and Theoretical Chemistry


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