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Chin. Phys. B, 2016, Vol. 25(7): 074702    DOI: 10.1088/1674-1056/25/7/074702
ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS Prev   Next  

Structure and switching of single-stranded DNA tethered to a charged nanoparticle surface

Xin-Jun Zhao(赵新军)1,2, Zhi-Fu Gao(高志福)3
1 Xinjiang Laboratory of Phase Transitions and Microstructures of Condensed Matter Physics, Yi Li Normal University, Yining 835000, China;
2 National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China;
3 Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi 830011, China
Abstract  Using a molecular theory, we investigate the temperature-dependent self-assembly of single-stranded DNA (ssDNA) tethered to a charged nanoparticle surface. Here the size, conformations, and charge properties of ssDNA are taken into account. The main results are as follows: i) when the temperature is lower than the critical switching temperature, the ssDNA will collapse due to the existence of electrostatic interaction between ssDNA and charged nanoparticle surface; ii) for the short ssDNA chains with the number of bases less than 10, the switching of ssDNA cannot happen, and the critical temperature does not exist; iii) when the temperature increases, the electrostatic attractive interaction between ssDNA and charged nanoparticle surface becomes weak dramatically, and ssDNA chains will stretch if the electrostatic attractive interaction is insufficient to overcome the elastic energy of ssDNA and the electrostatic repulsion energy. These findings accord well with the experimental observations. It is predicted that the switching of ssDNA will not happen if the grafting densities are too high.
Keywords:  molecular theory      ssDNA tethered to charged nanoparticle surface      temperature-dependent switching  
Received:  21 July 2015      Revised:  18 February 2016      Published:  05 July 2016
PACS:  47.27.eb (Statistical theories and models)  
  05.65.+b (Self-organized systems)  
Fund: Project supported by the Joint Funds of Xinjiang Natural Science Foundation, China (Grant No. 2015211C298).
Corresponding Authors:  Xin-Jun Zhao     E-mail:  zhaoxinjunzxj@163.com

Cite this article: 

Xin-Jun Zhao(赵新军), Zhi-Fu Gao(高志福) Structure and switching of single-stranded DNA tethered to a charged nanoparticle surface 2016 Chin. Phys. B 25 074702

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