The Reversible Phase Transition of DNA-Linked Colloidal Gold Assemblies

Details The Reversible Phase Transition of DNA-Linked Colloidal Gold Assemblies The Reversible Phase Transition of DNA-Linked Colloidal Gold Assemblies

2005-04-08

arxiv.org/abs/physics/0504061v2

Physica A, 354 (2005) 1-9.

Physics

Biological Physics

9 pages, 6 figures, Physica A (2005) to appear. Updated figures

Scientific paper

10.1016/j.physa.2005.02.037

We present direct evidence for a reversible phase transition of DNA-linked colloidal gold assemblies. Transmission electron microscopy and optical absorption spectroscopy are used to monitor the colloidal gold phase transition, whose behavior is dominated by DNA interactions. We use single-stranded DNA-capped colloidal gold that is linked by complementary linker DNA to form the assemblies. We found that, compared to free DNA, a sharp melting transition is observed for the DNA-linked colloidal gold assemblies. The structure of the assemblies is non-crystalline, much like a gel phase, consistent with theoretical predictions. Optical spectra and melting curves provide additional evidence of gelation of the colloidal system. The phase transition and separation are examples of percolation in a dilute solvent.

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