Letter | Published:

Freezing on a sphere

Nature volume 554, pages 346350 (15 February 2018) | Download Citation

  • An Addendum to this article was published on 26 June 2018

This article has been updated

Abstract

The best understood crystal ordering transition is that of two-dimensional freezing, which proceeds by the rapid eradication of lattice defects as the temperature is lowered below a critical threshold1,2,3,4. But crystals that assemble on closed surfaces are required by topology to have a minimum number of lattice defects, called disclinations, that act as conserved topological charges—consider the 12 pentagons on a football or the 12 pentamers on a viral capsid5,6. Moreover, crystals assembled on curved surfaces can spontaneously develop additional lattice defects to alleviate the stress imposed by the curvature6,7,8. It is therefore unclear how crystallization can proceed on a sphere, the simplest curved surface on which it is impossible to eliminate such defects. Here we show that freezing on the surface of a sphere proceeds by the formation of a single, encompassing crystalline ‘continent’, which forces defects into 12 isolated ‘seas’ with the same icosahedral symmetry as footballs and viruses. We use this broken symmetry—aligning the vertices of an icosahedron with the defect seas and unfolding the faces onto a plane—to construct a new order parameter that reveals the underlying long-range orientational order of the lattice. The effects of geometry on crystallization could be taken into account in the design of nanometre- and micrometre-scale structures in which mobile defects are sequestered into self-ordered arrays. Our results may also be relevant in understanding the properties and occurrence of natural icosahedral structures such as viruses5,9,10.

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Change history

  • 26 June 2018

    Two additional references should have been cited, which investigated the icosahedral ordering of lattice defects in assemblies of hard particles packed on the surfaces of spheres. Please see the accompanying Addendum.

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Acknowledgements

We thank M. J. Bowick and A. Travesset for discussions. This research was primarily supported by the National Science Foundation (NSF) under grant DMR 1105417 and grant GBMF3849 from the Gordon and Betty Moore Foundation. This work was supported partially by the Materials Research Science and Engineering Center (MRSEC) Program of the NSF under award number DMR-1420073 and by the National Aeronautics and Space Administration (NASA) under grant NNX13AR67G. This work has used the NYU IT High Performance Computing resources and services.

Author information

Author notes

    • Rodrigo E. Guerra
    •  & Colm P. Kelleher

    These authors contributed equally to this work.

Affiliations

  1. Center for Soft Matter Research New York University, New York, New York 10003, USA

    • Rodrigo E. Guerra
    • , Colm P. Kelleher
    • , Andrew D. Hollingsworth
    •  & Paul M. Chaikin

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Contributions

C.P.K. performed the experiments. A.D.H. synthesized the samples. R.E.G. performed the simulations. C.P.K., R.E.G. and P.M.C. designed the research, analysed the data and wrote the paper. P.M.C. conceived and directed the project.

Competing interests

The authors declare no competing financial interests.

Corresponding author

Correspondence to Paul M. Chaikin.

Reviewer Information Nature thanks D. A. Vega and the other anonymous reviewer(s) for their contribution to the peer review of this work.

Publisher's note: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Supplementary information

PDF files

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    Supplementary Information

    This file contains a detailed description of experimental, computational, analytical, and theoretical methods used in this study.

Zip files

  1. 1.

    Supplementary Code

    This zipped file contains plug-ins for HOOMD-blue v1.3.3 implementing BAOAB Geometric Langevin integrators and dipole-dipole interaction potentials used in our simulations, as well as MATLAB-based data analysis software including sub-routines written in CUDA and C.

Image files

  1. 1.

    Animated Voronoi tessellation of experimentally determined particle positions for Γ=145 sphere, together with renderings of ordinary and cage-relative particle displacements.

    Animated Voronoi tessellation of experimentally determined particle positions for Γ=145 sphere described in the text, together with renderings of the ordinary and cage-relative particle displacements.

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DOI

https://doi.org/10.1038/nature25468

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