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首页> 外文期刊>Crystal growth & design >Enhanced Lateral to Basal Surface Ratio in Boehmite Nanoparticles Achieved by Hydrothermal Aging
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Enhanced Lateral to Basal Surface Ratio in Boehmite Nanoparticles Achieved by Hydrothermal Aging

机译：通过水热老化获得的勃姆石纳米颗粒中提高的侧向基表面比

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摘要

Boehmite nanocrystals with tridimensional shape were synthesized by lengthening the aging time of the hydrothermal processing. Boehmite was first precipitated at pH 10 and at 100 degrees C from an aqueous Al3+ solution, and subsequently hydrothermally annealed at 200 degrees C over the range time between 24 and 168 h. The crystalline structure of all the boehmite nanocrystals prepared showed no significant modifications. On the contrary, its microstructure strongly depended on the aging time, as the growth of the nanoparticles showed two clearly different steps: In the first one, crystallites grew mainly along the < 101 > directions, usually referred as basal, whereas in the second one the growth was along the b-axis, i.e., in the [010] direction. This led to an increase of the proportion of lateral faces parallel to the b-axis in the total surface area of the nanoparticles with an increase of the annealing time. The higher proportion of lateral faces increased the total surface charge of the nanoparticles. Thus, important properties as the stabilization of the boehmite nanocrystals in suspension or their potential functionalization by grafting of organic molecules on these surfaces could be controlled applying the described methodology.
机译：通过延长水热处理的时效时间，合成了三维形状的勃姆石纳米晶体。首先在pH 10和100摄氏度下从Al3 +水溶液中沉淀勃姆石，然后在24至168小时的时间范围内在200摄氏度下进行水热退火。所制备的所有勃姆石纳米晶体的晶体结构均未显示出明显的变化。相反，其微结构在很大程度上取决于老化时间，因为纳米粒子的生长显示出两个明显不同的步骤：在第一个步骤中，微晶主要沿<101>方向生长，通常称为基底，而在第二个步骤中增长沿b轴，即[010]方向。这导致与纳米粒子的总表面积中平行于b轴的侧面的比例随着退火时间的增加而增加。较高比例的侧面增加了纳米颗粒的总表面电荷。因此，可以使用所描述的方法来控制重要的性质，例如悬浮液中的勃姆石纳米晶体的稳定或通过将有机分子接枝到这些表面上而将其潜在的功能化。

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