dorsal/arxiv
View SchemaThe Reversible Phase Transition of DNA-Linked Colloidal Gold Assemblies
| Authors | Young Sun, Nolan C. Harris, Ching-Hwa Kiang |
|---|---|
| Categories | |
| ArXiv ID | physics/0504061 |
| URL | https://arxiv.org/abs/physics/0504061 |
| DOI | 10.1016/j.physa.2005.02.037 |
| Journal | Physica A, 354 (2005) 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.
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"abstract": "We present direct evidence for a reversible phase transition of DNA-linked\ncolloidal gold assemblies. Transmission electron microscopy and optical\nabsorption spectroscopy are used to monitor the colloidal gold phase\ntransition, whose behavior is dominated by DNA interactions. We use\nsingle-stranded DNA-capped colloidal gold that is linked by complementary\nlinker DNA to form the assemblies. We found that, compared to free DNA, a sharp\nmelting transition is observed for the DNA-linked colloidal gold assemblies.\nThe structure of the assemblies is non-crystalline, much like a gel phase,\nconsistent with theoretical predictions. Optical spectra and melting curves\nprovide additional evidence of gelation of the colloidal system. The phase\ntransition and separation are examples of percolation in a dilute solvent.",
"arxiv_id": "physics/0504061",
"authors": [
"Young Sun",
"Nolan C. Harris",
"Ching-Hwa Kiang"
],
"categories": [
"physics.bio-ph",
"physics.ins-det"
],
"doi": "10.1016/j.physa.2005.02.037",
"journal_ref": "Physica A, 354 (2005) 1-9.",
"title": "The Reversible Phase Transition of DNA-Linked Colloidal Gold Assemblies",
"url": "https://arxiv.org/abs/physics/0504061"
},
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