Crystal-to-Crystal Transitions in Binary Mixtures of Soft Colloids
journal contributionposted on 14.11.2020, 19:03 by Jasper N. Immink, Maxime J. Bergman, J. J. Erik Maris, Joakim Stenhammar, Peter Schurtenberger
In this article, we demonstrate a method for inducing reversible crystal-to-crystal transitions in binary mixtures of soft colloidal particles. Through a controlled decrease of salinity and increasingly dominating electrostatic interactions, a single sample is shown to reversibly organize into entropic crystals, electrostatic attraction-dominated crystals, or aggregated gels, which we quantify using microscopy and image analysis. We furthermore analyze crystalline structures with bond order analysis to discern between two crystal phases. We observe the different phases using a sample holder geometry that allows both in situ salinity control and imaging through confocal laser scanning microscopy and apply a synthesis method producing particles with high resolvability in microscopy with control over particle size. The particle softness provides for an enhanced crystallization speed, while altering the re-entrant melting behavior as compared to hard sphere systems. This work thus provides several tools for use in the reproducible manufacture and analysis of binary colloidal crystals.
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attraction-dominated crystalsparticle sizesphere systemssynthesis methodbond order analysissalinity controlCrystal-to-Crystal Transitionsconfocal laser scanning microscopycrystallization speedsample holder geometrySoft ColloidsBinary Mixturescrystal phasesentropic crystalscrystal-to-crystal transitionsimage analysisparticle softness