Packing polydisperse colloids into crystals: when charge-dispersity matters
arXiv:1909.02774 · doi:10.1103/PhysRevLett.124.058003
Abstract
Monte-Carlo simulations and small-angle x-ray scattering experiments were used to determine the phase diagram of aqueous dispersions of titratable nano-colloids with a moderate size polydispersity over a broad range of monovalent salt concentrations, 0.5 mM 50 mM and volume fractions, . Under slow and progressive increase in , the dispersions freeze into a face-centered-cubic (fcc) solid followed unexpectedly by the formation of a body centered cubic (bcc) phase before to melt in a glass forming liquid. The simulations are found to predict very well these observations. They suggest that the stabilization of the bcc solid at the expense of the fcc phase at high and results from the interaction (charge) polydispersity and vibrational entropy.
arXiv comment5 pages, 4 figures, Accepted in PRL
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