| Issue |
EPL
Volume 82, Number 4, May 2008
|
|
|---|---|---|
| Article Number | 46002 | |
| Number of page(s) | 5 | |
| Section | Condensed Matter: Structural, Mechanical and Thermal Properties | |
| DOI | https://doi.org/10.1209/0295-5075/82/46002 | |
| Published online | 07 May 2008 | |
Anomalous diffusion of ions at the surface of hydrated DNA molecule
1
Physical Chemistry, Dortmund University of Technology - Otto-Hahn-Str. 6, Dortmund, D-44227, Germany, EU
2
CNRS UPR9080, Institut de Biologie Physico-Chimique - 13, rue Pierre et Marie Curie, Paris, F-75005, France, EU
Corresponding authors: alla@pc2a.chemie.uni-dortmund.de alexey@ibpc.fr
Received:
26
January
2008
Accepted:
25
March
2008
Diffusion of ions at the surface of the DNA molecule is found to be anomalous under various levels of hydration. The increase of the exponent α of anomalous diffusion from 0.66 to 0.81 upon hydration correlates with the appearance and growth of the spanning network of hydration water. Water shows anomalous diffusion with exponent α ≈ 0.84, independent of the hydration level. We argue that the anomalous diffusion of ions is governed by the spatial disorder of the surface of hydrated DNA that depends on water clustering and cannot be ignored even under full hydration. The effect of local confinement and temporal disorder on the translational motion is noticeable at small time scales only.
PACS: 66.10.-x – Diffusion and ionic conduction in liquids / 61.20.Ja – Computer simulation of liquid structure / 87.14.gk – DNA
© EPLA, 2008
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