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dingjiajian

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The stability of most metal sols against aggregation is largely a kinetic effect due to the large Coulombic repulsive barrier resulting from the localization of charged particles on or near the nanoparticle’s surface, making the effective charge on the nanoparticle nonzero. It has been known for some time, moreover, that the addition of ionic or neutral species to a stable sol can result in the destabilization of the colloid through one of a number of mechanisms, which may vary according to the concentration of the added material. Specifically, the mechanism for replacing a charged adsorbate with a neutral species at the surface of the colloid particle has been proposed before.2,3 (There are several other ways of stabilizing colloidal particles, such as steric stabilization. These have been the subject of numerous publications,but are not pertinent here.)
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jnxybsf

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dingjiajian: 金币+2, 翻译EPI+1, 有帮助 2016-01-16 18:53:44
金属溶胶不易团聚的稳定定性主要是一种动力学效应,该效应是由于纳米颗粒表面或附近的带电粒子产生了很大的库伦排斥势垒所造成,从而使纳米颗粒的非零电位有了有效电荷。同时,溶胶中加入的离子性或中性物质会导致胶体的不稳定性,其机理可能与加入物质的浓度有关。具体而言,胶体粒子表面的中性物取代带电的吸附物机理之前已被提出。(有些稳定胶体粒子的其他方法,如空间位阻稳定法。这些方法已在很多文献中已被讨论,但这里不做论述)     外行  尽请指正
2楼2016-01-16 00:17:22
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