Stabilization of colloidal suspensions by means of highly charged nanoparticles
Stabilization of colloidal suspensions by means of highly charged nanoparticles
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DOI：
10.1103/physrevlett.93.247802
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发表时间：
2004-12-10
影响因子：
8.6
通讯作者：
Luijten, E
中科院分区：
文献类型：
--
作者：
Liu, JW;Luijten, E
我们采用了一种新的蒙特卡罗模拟方案来阐明中性胶体微球通过高度带电的纳米颗粒的稳定性[V.Tohver，Proc.Natl. Acad. Sci. U.S.A.98，8950（2001）]。根据实验观察，我们发现，小的纳米粒子浓度诱导有效的排斥，防止凝胶化所造成的固有的货车德瓦尔斯吸引胶体之间。更高的纳米颗粒浓度诱导的吸引力的潜力，这是，然而，定性地不同于定期耗尽吸引力。我们还展示了如何胶体纳米粒子的尺寸不对称性和纳米粒子的电荷可以用来操纵有效的相互作用。
We employ a novel Monte Carlo simulation scheme to elucidate the stabilization of neutral colloidal microspheres by means of highly charged nanoparticles [V. Tohver , Proc. Natl. Acad. Sci. U.S.A. 98, 8950 (2001)]. In accordance with the experimental observations, we find that small nanoparticle concentrations induce an effective repulsion that prevents gelation caused by the intrinsic van der Waals attraction between colloids. Higher nanoparticle concentrations induce an attractive potential which is, however, qualitatively different from the regular depletion attraction. We also show how colloid-nanoparticle size asymmetry and nanoparticle charge can be used to manipulate the effective interactions.