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首页> 外文期刊>RSC Advances >Growth behavior of water dispersed MgAl layered double hydroxide nanosheets
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Growth behavior of water dispersed MgAl layered double hydroxide nanosheets

机译：水分散的MgAl层状双氢氧化物纳米片的生长行为

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Water-dispersed LDH nanosheets prepared using a microreactor could be used as building blocks for LDH-based functional materials. Elucidating the growth behavior of LDH nanosheets in aqueous phase helps to obtain its aqueous dispersion for further application in different fields. In this paper, a two stage growth behavior of LDH nanosheets was proposed which was based on the results of transmittance, viscosity, pH value, size distribution and morphological features of crystallites. In the first stage, MgAl-LDH nanosheet gel was dispersive in aqueous phase and the lateral size of nanosheets grew progressively, while in the second stage, the nanosheets stacked to build a three-dimensional network and the integrated plate-like structure of LDH was formed progressively. For both stages, curves of pH versus standing time implied the growth behavior fitted a first-order model. The results of both transmittance and viscosity indicated that the dispersion degree and nanosheet stacking rate were temperature dependent and independent of concentration. A diagram including three regions was made, which could be used to determine the state of the LDH nanosheets in aqueous phase and could also provide a theoretical basis for the practical application of LDH nanosheets.
机译：使用微反应器制备的水分散的LDH纳米片可用作基于LDH的功能材料的基础。阐明LDH纳米片在水相中的生长行为有助于获得其水分散液，以进一步应用于不同领域。本文基于透射率，粘度，pH值，晶粒尺寸分布和微晶形态特征，提出了LDH纳米片的两阶段生长行为。在第一阶段，MgAl-LDH纳米片凝胶分散在水相中，纳米片的横向尺寸逐渐增加，而在第二阶段，纳米片堆叠以建立三维网络，LDH的集成板状结构为逐渐形成。在这两个阶段，pH值对的站立时间的曲线都暗示了生长行为符合一阶模型。透射率和粘度的结果表明，分散度和纳米片堆叠速率是温度依赖性的，并且与浓度无关。制作了包括三个区域的图，可用于确定LDH纳米片在水相中的状态，也可为LDH纳米片的实际应用提供理论依据。

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