Halos mechanism in stabilizing of colloidal suspensions: Nanoparticle weight fraction and pH effects
Halos mechanism in stabilizing of colloidal suspensions: Nanoparticle weight fraction and pH effects
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DOI：
10.1016/j.jeurceramsoc.2006.05.109
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发表时间：
2007-01-01
影响因子：
5.7
通讯作者：
Babaluo, A. A.
中科院分区：
文献类型：
--
作者：
Karimian, H.;Babaluo, A. A.
纳米颗粒晕是一种比传统方法更高效稳定胶体悬浮液的新方法。但是，迄今为止，关于该方法的稳定机制的文章还很少。本文研究了高电荷 CeO2 纳米粒子存在下胶体 Al2O3 水悬浮液的分散行为以及两个关键参数的影响；二氧化铈纳米粒子浓度和pH值对Al2O3-CeO2双分散悬浮液稳定性的影响。通过沉降技术研究了这些悬浮液的稳定性行为。从这项工作得出的结论是，通过增加二氧化铈纳米粒子的浓度，这些双分散系统的稳定性达到最佳状态。但进一步增加纳米颗粒会导致胶体悬浮液稳定性下降。结果表明，悬浮液在pH 10时具有最佳的分散状态和较高的稳定性。计算的DLVO颗粒间相互作用势验证了pH对其稳定性行为影响的实验结果。 3周后沉积层的扫描电子显微镜（SEM）和SEM能量色散X射线分析（SEM/EDXA）也证明了双分散悬浮液的稳定性。 (c) 2006 Elsevier Ltd. 保留所有权利。
Nanoparticle halo is a novel method that stabilizes colloidal suspensions with high efficiency compared to conventional methods. But, up to now few articles have been published on the stabilization mechanism of this method. This article investigates the dispersion behavior of colloidal Al2O3 aqueous suspensions in the presence of highly charged CeO2 nanoparticles and the effect of two key parameters; the ceria nanoparticle concentration and pH on the stability of Al2O3-CeO2 bidispersed suspensions. The stability behavior of these suspensions was investigated by sedimentation technique. It was concluded from this work that by increasing ceria nanoparticle concentration the stability of these bidispersed systems reaches an optimum condition. but further increasing of nanoparticles results in decreasing of the colloidal suspension stability. Also, the results showed that the suspensions have optimum dispersion state and high stability at pH 10. The calculated DLVO interparticle interaction potentials verified the experimental results of the pH effect on the stability behavior. The stabilization of the bidispersed suspensions was also evidenced by scanning electron microscopy (SEM) and SEM energy dispersive X-ray analysis (SEM/EDXA) of the sediment layers after 3 weeks. (c) 2006 Elsevier Ltd. All rights reserved.