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Effect of pH on the kinetics of crystal growth by oriented aggregation

机译：pH值对定向聚集对晶体生长动力学的影响

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The kinetics of oriented aggregation are sensitive to solution conditions, including pH. Decreasing the difference between solution pH and the point of zero net proton charge results in an increasing second-order rate constant for nonclassical crystal growth by oriented aggregation. Results are discussed in the context of Derjaguin and Landau, Verwey and Overbeek (DLVO) theory through the use of quantitative statistical comparisons. The magnitude of the increase depends on the primary particle size; however, the magnitude and trend in size dependence deviate from predictions based on DLVO theory. Oriented aggregation occurs in a wide array of important materials often resulting in nanocrystals with unique, anisotropic, and symmetry-defying morphologies. The growth of acicular goethite (α- FeOOH) was used as a model system for this research. Transmission electron microscopy with time-resolved sampling was employed using semiautomated image analysis to quantify the rate constant for growth by oriented aggregation.
机译：定向聚集的动力学对溶液条件（包括pH）敏感。溶液pH值和质子净净电荷为零的点之间的差异减小，导致非经典晶体通过定向聚集生长而产生的二级速率常数增加。通过使用定量统计比较，在Derjaguin和Landau，Verwey和Overbeek（DLVO）理论的背景下讨论了结果。增加的幅度取决于一次粒径。但是，大小相关性的大小和趋势与基于DLVO理论的预测有所不同。定向聚集发生在各种各样的重要材料中，通常会导致纳米晶具有独特的，各向异性的和不对称的形态。针状针铁矿（α-FeO​​OH）的生长被用作该研究的模型系统。使用具有时间分辨采样的透射电子显微镜，使用半自动图像分析来量化通过定向聚集生长的速率常数。

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