离子
二价
表面电荷
化学物理
流动电流
反离子
离子势
离子键合
电荷(物理)
材料科学
反演(地质)
分子物理学
化学
物理
纳米技术
物理化学
地质学
电动现象
古生物学
有机化学
构造盆地
冶金
量子力学
作者
Frank H. J. van der Heyden,Derek Stein,K. Besteman,Serge G. Lemay,Cees Dekker
标识
DOI:10.1103/physrevlett.96.224502
摘要
We report charge inversion, the sign reversal of the effective surface charge in the presence of multivalent counterions, for the biologically relevant regimes of divalent ions and mixtures of monovalent and multivalent ions. Using streaming currents, the pressure-driven transport of countercharges in the diffuse layer, we find that charge inversion occurs in rectangular silica nanochannels at high concentrations of divalent ions. Strong monovalent screening is found to cancel charge inversion, restoring the original surface charge polarity. An analytical model based on ion correlations successfully describes our observations.
科研通智能强力驱动
Strongly Powered by AbleSci AI