Dispersion and size control of layered double hydroxide nanoparticles in aqueous solutions.
Dispersion and size control of layered double hydroxide nanoparticles in aqueous solutions.
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DOI：
10.1021/jp062281o
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发表时间：
2006-08
期刊：
影响因子：
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通讯作者：
Z. Xu;G. Stevenson;Chao Lu;G. Lu
中科院分区：
文献类型：
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作者：
Z. Xu;G. Stevenson;Chao Lu;G. Lu
我们报道了一种简单而有效的方法来制备稳定的均匀悬浮液含有单分散的MgAl层状双氢氧化物（LDH）纳米粒子，具有广泛的应用前景的细胞药物（基因）的交付，聚合物/LDH纳米复合材料，和LDH薄膜的催化，气体分离，传感和电化学材料。这种新方法涉及快速共沉淀，然后在不同条件下进行受控水热处理，并在可变水热处理条件下产生稳定均匀的LDH悬浮液。此外，LDH颗粒尺寸与水热处理条件（时间、温度和浓度）之间的关系已经被系统地研究，这表明LDH颗粒尺寸可以通过调节这些条件精确地控制在40和300 nm之间。在相同条件下制备相同混悬液的重现性已通过大量实验得到证实。进一步讨论了在水热处理过程中聚集的LDH聚集体分散成单个LDH微晶的情况。这种方法也已成功地应用于制备稳定的均相LDH悬浮液，其氢氧化物层中含有各种其他金属离子如Ni（2+）、Fe（2+）、Fe（3+）、Co（2+）、Cd（2+）和Gd（3+）以及许多无机阴离子如Cl（-）、CO（3）（2-）、NO（3）（-）和SO（4）（2-）。
We report a simple but efficient method to prepare stable homogeneous suspensions containing monodispersed MgAl layered double hydroxide (LDH) nanoparticles that have wide promising applications in cellular drug (gene) delivery, polymer/LDH nanocomposites, and LDH thin films for catalysis, gas separation, sensing, and electrochemical materials. This new method involves a fast coprecipitation followed by controlled hydrothermal treatment under different conditions and produces stable homogeneous LDH suspensions under variable hydrothermal treatment conditions. Moreover, the relationship between the LDH particle size and the hydrothermal treatment conditions (time, temperature, and concentration) has been systematically investigated, which indicates that the LDH particle size can be precisely controlled between 40 and 300 nm by adjusting these conditions. The reproducibility of making the identical suspensions under identical conditions has been confirmed with a number of experiments. The dispersion of agglomerated LDH aggregates into individual LDH crystallites during the hydrothermal treatment has been further discussed. This method has also been successfully applied to preparing stable homogeneous LDH suspensions containing various other metal ions such as Ni(2+), Fe(2+), Fe(3+), Co(2+), Cd(2+), and Gd(3+) in the hydroxide layers and many inorganic anions such as Cl(-), CO(3)(2-), NO(3)(-), and SO(4)(2-).