Observation of Microheterogeneity in Highly Concentrated Nonaqueous Electrolyte Solutions

Lily A. Robertson, Zhixia Li, Yu Cao, Ilya A. Shkrob, Madhusudan Tyagi, Kyle C. Smith, Lu Zhang, Jeffrey S. Moore, Y. Zhyang

Research output: Contribution to journalArticle

Abstract

The development of models to describe structure and dynamics of nonaqueous electrolyte solutions is challenging, and experimental observations are needed to form a foundation. Here, neutron scattering is used to probe molecular dynamics in nonaqueous organic electrolytes. Two solutions were compared: One contained symmetrical electrolyte molecules prone to crystallize, and one contained desymmetrized electrolyte molecules preferring disordered states. For the latter, calorimetry and neutron data show that a disordered fluid persists to very low temperatures at high concentrations. Upon heating, localized cold crystallization occurs, leading to burst nucleation of microcrystalline solids within fluid phases. Our findings indicate molecular clustering and point to solvation inhomogeneities and molecular crowding in these concentrated fluids.

Original languageEnglish (US)
Pages (from-to)8041-8046
Number of pages6
JournalJournal of the American Chemical Society
Volume141
Issue number20
DOIs
StatePublished - Jan 1 2020

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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