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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 24: Poster Session I
CPP 24.16: Poster
Montag, 16. März 2020, 17:30–19:30, P3
Packing polydisperse colloids into crystals: when charge-dispersity matters — •Lucas Goehring1, Guillaume Bareigts2, Pree-Cha Kiatkirakajorn3, Joaquim Li4, Robert Botet5, Michael Sztucki6, Bernard Cabane4, and Christophe Labbez2 — 1Nottingham Trent University — 2University Bourgogne — 3Max Planck Institute for Dynamics and Self-Organisation — 4ESPCI ParisTech — 5University Paris-Sud — 6ESRF-The European Synchrotron
Here we show that even modest amounts of polydispersity can dramatically change how colloidal crystallization occurs. Monte-Carlo simulations, fully constrained by experimental parameters, are found to agree well with a measured phase diagram of aqueous dispersions of nanoparticles with a moderate size polydispersity over a broad range of salt concentrations, cs, and volume fractions, φ. Upon increasing φ, the colloids freeze first into coexisting compact solids then into a body centered cubic phase (bcc) before they melt into a glass forming liquid. The surprising stability of the bcc solid at high φ and cs is explained by the interaction (charge) polydispersity and vibrational entropy.