Switchable self-protected attractions in DNA-functionalized colloids

Abstract

Surface functionalization with DNA is a powerful tool for guiding the self-assembly of nanometre- and micrometre-sized particles1,2,3,4,5,6,7,8,9,10,11. Complementary ‘sticky ends’ form specific inter-particle links and reproducibly bind at low temperature and unbind at high temperature. Surprisingly, the ability of single-stranded DNA to form folded secondary structures has not been explored for controlling (nano) colloidal assembly processes, despite its frequent use in DNA nanotechnology12,13,14. Here, we show how loop and hairpin formation in the DNA coatings of micrometre-sized particles gives us in situ control over the inter-particle binding strength and association kinetics. We can finely tune and even switch off the attractions between particles, rendering them inert unless they are heated or held together—like a nano-contact glue. The novel kinetic control offered by the switchable self-protected attractions is explained with a simple quantitative model that emphasizes the competition between intra- and inter-particle hybridization, and the practical utility is demonstrated by the assembly of designer clusters in concentrated suspensions. With self-protection, both the suspension and assembly product are stable, whereas conventional attractive colloids would quickly aggregate. This remarkable functionality makes our self-protected colloids a novel material that greatly extends the utility of DNA-functionalized systems, enabling more versatile, multi-stage assembly approaches.

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Figure 1: Conventional and self-protected DNA-mediated interaction schemes.
Figure 2: Association–dissociation kinetics for conventional and self-protected interactions.
Figure 3: Temperature response and proximity response of the switchable self-protected interactions.
Figure 4: Directed assembly using self-protected interactions as a ‘nano-contact glue’.
Figure 5: Experimental and modelled association–dissociation kinetics.

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Acknowledgements

We thank D. J. Pine and M. Zuker for useful discussions. This work was supported partially by the MRSEC Program of the National Science Foundation under Award Number DMR-0820341, by the Keck Foundation and the Netherlands Organisation for Scientific Research (NWO).

Author information

M.E.L. carried out the experiments, theoretically modelled the data and wrote the manuscript. R.D. was involved in setting up the experiments and the development of the model, F.C.C. and D.G.G. participated in the optical laser tweezer experiments, R.S. and N.C.S. synthesized DNA and P.M.C. supervised the research. Everybody contributed important conceptual insight.

Correspondence to Mirjam E. Leunissen.

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Leunissen, M., Dreyfus, R., Cheong, F. et al. Switchable self-protected attractions in DNA-functionalized colloids. Nature Mater 8, 590–595 (2009) doi:10.1038/nmat2471

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