Hiding in plain view: Colloidal self-assembly from polydisperse populations
| Autor: | Cabane, Bernard, Li, Joaquim, Artzner, Franck, Botet, Robert, Labbez, Christophe, Bareigts, Guillaume, Sztucki, Michael, Goehring, Lucas |
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| Rok vydání: | 2015 |
| Předmět: | |
| Zdroj: | Phys. Rev. Lett. 116, 208001 (2016) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevLett.116.208001 |
| Popis: | We report small-angle x-ray scattering (SAXS) experiments on aqueous dispersions of colloidal silica with a broad monomodal size distribution (polydispersity 18%, size 8 nm). Over a range of volume fractions the silica particles segregate to build first one, then two distinct sets of colloidal crystals. These dispersions thus demonstrate fractional crystallization and multiple-phase (bcc, Laves AB$_2$, liquid) coexistence. Their remarkable ability to build complex crystal structures from a polydisperse population originates from the intermediate-range nature of interparticle forces, and suggests routes for designing self-assembling colloidal crystals from the bottom-up. Comment: 5 pages, 3 figures and 2 tables + supplemental analysis (5 pages, 1 figure, 3 tables) |
| Databáze: | arXiv |
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