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Nanometer-Scale Correlations in Aqueous Salt Solutions
journal contribution
posted on 2020-03-18, 13:49 authored by Evgenii O. Fetisov, Christopher J. Mundy, Gregory K. Schenter, Chris J. Benmore, John L. Fulton, Shawn M. KathmannThe intermediate-range
(1–4 nm) correlation of cations,
anions, and water in aqueous alkaline earth salt solutions is measured
using synchrotron X-ray diffraction. We differentiate from the entire
solution structure factor, SX(Q), a separate region at low Q (<1.5
Å–1) containing local diffraction maxima (prepeaks)
that indicate nanometer-scale oscillatory behavior. These features
are quantitatively reproduced with classical molecular dynamics simulations.
At high concentrations, the prepeaks emerge from correlations arising
from the existence of small quasi close-packed lattice-like structures
comprised of cation hydration spheres. We also analyze the concentration
dependence of the prepeak and discuss the overall results in light
of the rich literature dealing with intermediate-range correlations
underlying universal phenomena in concentrated electrolytes.
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earth salt solutionsquasi close-packed lattice-like structuressolution structure factorsynchrotron X-ray diffractionNanometer-Scale CorrelationsprepeakAqueous Salt Solutionsdiffraction maximaconcentration dependenceS Xnanometer-scale oscillatory behaviordynamics simulationscorrelationcation hydration spheres
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