Xu Zhi Ping, Stevenson Gregory, Lu Chao-Qing, Lu Gao Qing Max
ARC Centre for Functional Nanomaterials, School of Engineering, The University of Queensland, Brisbane, QLD 4072, Australia.
J Phys Chem B. 2006 Aug 31;110(34):16923-9. doi: 10.1021/jp062281o.
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-).
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，该悬浮液包含单分散的镁铝层状双氢氧化物（LDH）纳米颗粒，这些纳米颗粒在细胞药物（基因）递送、聚合物/LDH纳米复合材料以及用于催化、气体分离、传感和电化学材料的LDH薄膜方面具有广泛的应用前景。这种新方法包括快速共沉淀，然后在不同条件下进行可控水热处理，并在可变的水热处理条件下产生稳定的均匀LDH悬浮液。此外，还系统地研究了LDH粒径与水热处理条件（时间、温度和浓度）之间的关系，这表明通过调整这些条件，可以将LDH粒径精确控制在40至300纳米之间。通过多次实验证实了在相同条件下制备相同悬浮液的可重复性。进一步讨论了在水热处理过程中团聚的LDH聚集体分散成单个LDH微晶的情况。该方法还成功地应用于制备稳定的均匀LDH悬浮液，其中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-)。
