Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9727616 | Physica A: Statistical Mechanics and its Applications | 2005 | 9 Pages |
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.
Related Topics
Physical Sciences and Engineering
Mathematics
Mathematical Physics
Authors
Young Sun, Nolan C. Harris, Ching-Hwa Kiang,