Direct Observation in 3d of Structural Crossover in Binary Hard Sphere Mixtures

Antonia Statt, Rattachai Pinchaipat, Francesco Turci, Robert Evans, C Patrick Royall

Research output: Contribution to journalArticle (Academic Journal)peer-review

16 Citations (Scopus)
519 Downloads (Pure)

Abstract

For binary fluid mixtures of spherical particles in which the two species are sufficiently different in size, the dominant wavelength of oscillations of the pair correlation functions is predicted to change from roughly the diameter of the large species to that of the small species along a sharp crossover line in the phase diagram [C. Grodon et al., J. Chem. Phys. 121, 7869 (2004)]. Using particle-resolved colloid experiments in 3d we demonstrate that crossover exists and that its location in the phase diagram is in quantitative agreement with the results of both theory and our Monte-Carlo simulations. In contrast with previous work [J. Baumgartl et al., Phys. Rev. Lett. 98, 198303 (2007)], where a correspondence was drawn between crossover and percolation of both species, in our 3d study we find that structural crossover is unrelated to percolation.
Original languageEnglish
Article number144506
Number of pages7
JournalJournal of Chemical Physics
Volume144
Issue number4
DOIs
Publication statusPublished - 14 Apr 2016

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