Ion enrichment on the hydrophobic carbon-based surface in aqueous salt solutions due to cation-π interactions.
Ion enrichment on the hydrophobic carbon-based surface in aqueous salt solutions due to cation-π interactions.
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DOI:
10.1038/srep03436
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发表时间:
2013-12-06
影响因子:
4.6
通讯作者:
Fang, Haiping
中科院分区:
文献类型:
--
作者:
Shi, Guosheng;Liu, Jian;Wang, Chunlei;Song, Bo;Tu, Yusong;Hu, Jun;Fang, Haiping
By incorporating cation-π interactions to classic all-atoms force fields, we show that there is a clear enrichment of Na+ on a carbon-based π electron-rich surface in NaCl solutions using molecular dynamics simulations. Interestingly, Cl− is also enriched to some extend on the surface due to the electrostatic interaction between Na+ and Cl−, although the hydrated Cl−-π interaction is weak. The difference of the numbers of Na+ and Cl− accumulated at the interface leads to a significant negatively charged behavior in the solution, especially in nanoscale systems. Moreover, we find that the accumulation of the cations at the interfaces is universal since other cations (Li+, K+, Mg2+, Ca2+, Fe2+, Co2+, Cu2+, Cd2+, Cr2+, and Pb2+) have similar adsorption behaviors. For comparison, as in usual force field without the proper consideration of cation-π interactions, the ions near the surfaces have a similar density of ions in the solution.
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