Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India.
Homi Bhabha National Institute, Mumbai 400094, India.
Phys Rev E. 2017 Dec;96(6-1):060602. doi: 10.1103/PhysRevE.96.060602. Epub 2017 Dec 26.
The interactions following a reentrant phase transition of charged silica nanoparticles from one phase to two phases and back to one phase by varying the concentration of multivalent counterions have been examined. The observations are far beyond the framework of Debye-Hückel or even nonlinear Poisson-Boltzmann equations and demonstrate the universal behavior of multivalent counterion-driven charge inversion. We show that the interplay of multivalent counterion-induced short-range attraction and long-range electrostatic repulsion between nanoparticles results in reentrant phase behavior.
通过改变多价抗衡离子的浓度，研究了带电二氧化硅纳米颗粒从一相到两相再回到一相的重入相转变后的相互作用。这些观察结果远远超出了德拜-休克尔甚至非线性泊松-玻尔兹曼方程的范围，证明了多价抗衡离子驱动的电荷反转的普遍行为。我们表明，多价抗衡离子诱导的纳米颗粒之间的短程吸引力和长程静电排斥的相互作用导致了重入相行为。
