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Issue 38, 2013
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Assembling colloidal clusters using crystalline templates and reprogrammable DNA interactions

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Abstract

Transient bridges of DNA have been used to direct the self assembly of microscopic spherical particles into a variety of crystal structures. Here, by selectively reprogramming the strength of the DNA interactions within such crystals we form colloidal clusters with well-defined valence and symmetry at high yield. We first form ‘host’ crystals containing a small proportion of ‘impurity’ particles bearing a unique DNA sequence, and then add soluble DNA strands that cause the host crystal to melt while preserving the nearest neighbor bonds around each impurity particle. This yields clusters with cubical and cuboctahedral symmetry from host crystals having BCC and FCC structures, respectively. Annealing of these clusters leads them to transform into lower free energy, but still highly symmetric forms, sometimes accompanied by the ejection of particles. The interactions between such clusters in principle could be further reprogrammed to allow hierarchical assembly processes.

Graphical abstract: Assembling colloidal clusters using crystalline templates and reprogrammable DNA interactions

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Publication details

The article was received on 05 Apr 2013, accepted on 09 Jul 2013 and first published on 12 Jul 2013


Article type: Paper
DOI: 10.1039/C3SM50950H
Citation: Soft Matter, 2013,9, 9119-9128
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    Assembling colloidal clusters using crystalline templates and reprogrammable DNA interactions

    J. T. McGinley, I. Jenkins, T. Sinno and J. C. Crocker, Soft Matter, 2013, 9, 9119
    DOI: 10.1039/C3SM50950H

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