一维纳米孔中异常离子限制惩罚与巨离子屏效应
Anomalous Ion Confinement Penalties and Giant Ion-Screening Effects in One-Dimensional Nanopores
AI总结：
研究发现一维纳米孔中离子限制效应与离子屏效应的相互作用，揭示了电解质对离子限制效应的浓度依赖性影响。
摘要：
纳米限制减少了单个离子有利的水合自由能，这与水充满的纳米孔中的离子排斥和化学反应性变化相关。许多因素影响观察到的限制效应的大小。本文使用简单的经典力场和非极izable碳纳米管填充水作为最小的
英文摘要：
Nanoconfinement reduces the favorable hydration free energies of single ions, which is correlated with ion rejection and modified chemical reactivity in water-filled nanopores. Many factors contribute to the magnitude of the observed confinement effect. Here we use simple classical force fields and non-polarizable carbon nanotubes filled with water as minimal, "hydrogen atom"-like models to evaluate the single-ion intrinsic confinement hydration free energy penalty (Delta Delta G(hyd)). In tubes of radius R=7.5 Angstrom, we predict Delta Delta G(hyd)'s that are up to 7.8 kcal/mol, are much larger for Cl$^-$ than the smaller Na+ ion, and contradict the canonical Born Equation for ion solvation. Adding a 1.0~M background electrolyte reduces Delta Delta G(hyd) for the Na$^+$/Cl$^-$ pair by an amount exceeding the Debye-Huckel estimate in unconfined media by almost an order of magnitude. We identify concentration-dependent ion-screening of confinement effects as a major, unheralded consequence of electrolytes in cylindrical nanopores.
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