Interaction Heterogeneity can Favorably Impact Colloidal Crystal Nucleation

Ian C. Jenkins, John C. Crocker, and Talid Sinno
Phys. Rev. Lett. 119, 178002 – Published 23 October 2017

Abstract

Colloidal particles with short-ranged attractions, e.g., micron-scale spheres functionalized with single-stranded DNA oligomers, are susceptible to becoming trapped in disordered configurations even when a crystalline arrangement is the ground state. Moreover, for reasons that are not well understood, seemingly minor variations in the particle formulation can lead to dramatic changes in the crystallization outcome. We demonstrate, using a combination of equilibrium and nonequilibrium computer simulations, that interaction heterogeneity—variations in the energetic interactions among different particle pairs in the population—may favorably impact crystal nucleation. Specifically, interaction heterogeneity is found to lower the free energy barrier to nucleation via the formation of clusters comprised preferentially of strong-binding particle pairs. Moreover, gelation is inhibited by “spreading out over time” the nucleation process, resulting in a reduced density of stable nuclei, allowing each to grow unhindered and larger. Our results suggest a simple and robust approach for enhancing colloidal crystallization near the “sticky sphere” limit, and support the notion that differing extents of interaction heterogeneity arising from various particle functionalization protocols may contribute to the otherwise unexplained variations in crystallization outcomes reported in the literature.

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  • Received 12 February 2017

DOI:https://doi.org/10.1103/PhysRevLett.119.178002

© 2017 American Physical Society

Physics Subject Headings (PhySH)

Interdisciplinary PhysicsPolymers & Soft MatterGeneral PhysicsCondensed Matter, Materials & Applied Physics

Authors & Affiliations

Ian C. Jenkins, John C. Crocker, and Talid Sinno*

  • Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA

  • *Corresponding author. talid@seas.upenn.edu

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Issue

Vol. 119, Iss. 17 — 27 October 2017

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