International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Namiki, Tsukuba, Ibaraki, Japan.
Recent Pat Nanotechnol. 2012 Nov;6(3):159-68. doi: 10.2174/187221012803531574.
Layered double hydroxides, a rare family of anion-exchangeable functional materials with broad application prospects, have received much attention both in academic research reports and technological patents. It was recently discovered that they could be exfoliated into unilamellar nanosheets in different solvents. Especially, well-defined LDH nanosheets can be obtained through total delamination, in formamide, of large-sized crystallites prepared from homogeneous precipitation using hydrolysis agents. Bearing a positive charge at a two-dimensional molecular scale, layered double hydroxide nanosheets can be used as a model system for electrostatic layer-by-layer assembly in combination with polyanionic counterparts (polymer, DNA, oxide nanosheets, etc.) for various functional nanoarchitectures, such as lamellar aggregates, multilayer nanofilms and nanoshells.
层状双氢氧化物是一类阴离子可交换的功能材料，具有广泛的应用前景，在学术研究报告和技术专利中都受到了广泛关注。最近人们发现，层状双氢氧化物在不同溶剂中可以被剥离成单层纳米片。特别是，通过在 formamide 中对使用水解剂通过均匀沉淀制备的大尺寸晶体制备的层状双氢氧化物进行完全层离，可以得到具有明确结构的层状双氢氧化物纳米片。在二维分子尺度上带正电荷的层状双氢氧化物纳米片可用作静电逐层组装的模型体系，与多阴离子（聚合物、DNA、氧化物纳米片等）结合用于各种功能纳米结构，如层状聚集体、多层纳米薄膜和纳米壳。
