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

doi:10.1088/1674-1056/25/7/074702

中国物理B ›› 2016, Vol. 25 ›› Issue (7): 74702-074702.doi: 10.1088/1674-1056/25/7/074702

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇下一篇

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

Xin-Jun Zhao(赵新军), Zhi-Fu Gao(高志福)

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

收稿日期:2015-07-21 修回日期:2016-02-18 出版日期:2016-07-05 发布日期:2016-07-05
通讯作者: Xin-Jun Zhao E-mail:zhaoxinjunzxj@163.com
基金资助:
Project supported by the Joint Funds of Xinjiang Natural Science Foundation, China (Grant No. 2015211C298).

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

Received:2015-07-21 Revised:2016-02-18 Online:2016-07-05 Published:2016-07-05
Contact: Xin-Jun Zhao E-mail:zhaoxinjunzxj@163.com
Supported by:
Project supported by the Joint Funds of Xinjiang Natural Science Foundation, China (Grant No. 2015211C298).

摘要/Abstract

摘要： 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.

关键词: molecular theory, ssDNA tethered to charged nanoparticle surface, temperature-dependent switching

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.

Key words: molecular theory, ssDNA tethered to charged nanoparticle surface, temperature-dependent switching

中图分类号: (Statistical theories and models)

47.27.eb

05.65.+b (Self-organized systems)

赵新军, 高志福. Structure and switching of single-stranded DNA tethered to a charged nanoparticle surface[J]. 中国物理B, 2016, 25(7): 74702-074702.

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[J]. Chin. Phys. B, 2016, 25(7): 74702-074702.

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

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

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