Aggregation of Elongated Colloids in Water.

Aggregation of Elongated Colloids in Water.
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水中细长胶体的聚集。

DOI:
10.1021/acs.langmuir.6b03962
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发表时间:
2017
期刊:
Langmuir : the ACS journal of surfaces and colloids
影响因子:
--
通讯作者:
Jerolmack,DouglasJ
Jerolmack,DouglasJ
中科院分区:
--
文献类型:
--
作者:
Wu,Lei;Ortiz,CarlosP;Jerolmack,DouglasJ

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胶体聚集是远离平衡的无序生长的典型例子,并且已经针对球形单体的情况进行了广泛的研究。在工业和环境中遇到的许多颗粒是高度细长的;然而,颗粒形状对聚集动力学和结构的控制并不为人所知。在这里,我们探讨这种控制在实验室实验中,记录水的扩散和聚集的两种不同的细长胶体:天然石棉纤维和合成玻璃棒,具有相似的纵横比约5:1。我们还使用类似尺寸(0.1 μm)的玻璃球进行对照运行。从细长颗粒组装的聚集体是非紧凑的,与观察到的球形单体的经典聚集动力学显着不同的形态和生长速率。石棉和玻璃棒的结果非常相似,表明形状对材料性能的重要性,这表明我们的研究结果可以扩展到其他细长的胶体,如碳纳米管/纤维。这项研究可能会导致增强预测的运输和命运的胶体污染物在环境中,这是强烈影响的增长和结构的聚集体。
Colloidal aggregation is a canonical example of disordered growth far from equilibrium and has been extensively studied for the case of spherical monomers. Many particles encountered in industry and the environment are highly elongated; however, the control of particle shape on aggregation kinetics and structure is not well-known. Here, we explore this control in laboratory experiments that document aqueous diffusion and aggregation of two different elongated colloids: natural asbestos fibers and synthetic glass rods, with similar aspect ratios of about 5:1. We also perform control runs with glass spheres of similar size (∼1 μm). The aggregates assembled from the elongated particles are noncompact, with morphologies and growth rates that differ markedly from the classical aggregation dynamics observed for spherical monomers. The results for asbestos and glass rods are remarkably similar, demonstrating the primacy of shape over material propertiessuggesting that our findings may be extended to other elongated colloids such as carbon nanotubes/fibers. This study may lead to enhanced prediction of the transport and fate of colloidal contaminants in the environment, which are strongly influenced by the growth and structure of aggregates.
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