Pulsating dissolution of crystalline matter
Pulsating dissolution of crystalline matter
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DOI：
10.1073/pnas.1711254115
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发表时间：
2018-01-30
影响因子：
11.1
通讯作者：
Luttge, Andreas
中科院分区：
文献类型：
--
作者：
Fischer, Cornelius;Luttge, Andreas
流体-固体反应导致来自固体表面的材料通量或流向固体表面的材料通量。通量的预测，它的变化，以及随时间的变化是感兴趣的广泛的学科，从材料和地球科学到制药科学。从一系列地形图中得到的反应速率图说明了晶体表面上反应速率的空间分布。在这里，我们提出了高度空间分辨率图，揭示了存在的节奏脉冲的物质通量从晶体表面。这一观察导致我们对晶体物质溶解方式的理解发生了变化。有节奏的波动的反应表面的网站密度和潜在的伴随振荡的流体饱和度意味着空间和时间的变化表面反应速率。这种可变性的知识可以帮助尝试高档微观速率和预测通过改变多孔介质的反应运输。
Fluid-solid reactions result in material flux from or to the solid surface. The prediction of the flux, its variations, and changes with time are of interest to a wide array of disciplines, ranging from the material and earth sciences to pharmaceutical sciences. Reaction rate maps that are derived from sequences of topography maps illustrate the spatial distribution of reaction rates across the crystal surface. Here, we present highly spatially resolved rate maps that reveal the existence of rhythmic pulses of the material flux from the crystal surface. This observation leads to a change in our understanding of the way crystalline matter dissolves. Rhythmic fluctuations of the reactive surface site density and potentially concomitant oscillations in the fluid saturation imply spatial and temporal variability in surface reaction rates. Knowledge of such variability could aid attempts to upscale microscopic rates and predict reactive transport through changing porous media.