The reversible phase transition of DNA-linked colloidal gold assemblies

Young Sun, Nolan C. Harris and Ching-Hwa Kiang

Physica A: Statistical Mechanics and its Applications, 2005, vol. 354, issue C, 1-9

Abstract: 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.

Keywords: DNA phase transition; Gold nanoparticle; DNA melting (search for similar items in EconPapers)
Date: 2005
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Citations: View citations in EconPapers (1)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:354:y:2005:i:c:p:1-9

DOI: 10.1016/j.physa.2005.02.037

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