层板剥离水滑石的制备及影响因素

采用阴离子表面活性剂N-月桂酰基谷氨酸(LG)为插层分子，研究了烷烃-LG-水(O/W)微乳液中烷烃量的变化对插层水滑石层间距的影响，同时研究了烷烃分子大小和水滑石层板阳离子不同对水滑石剥离难易程度的影响。实验表明，随着微乳液中烷烃含量的增加，制备得到了由插层到层板剥离的水滑石，并且烷烃的链长越长，水滑石的剥离越容易实现。层板化学组成对剥离难易程度也有影响，难易程度依次是Mg/Al-LDH，Zn/Al-LDH和Ni/Al-LDH。

Delamination of Layered Double Hydroxides in Microemulsion

The delamination of layered double hydroxides (LDH) is supposed to achieve in a microemulsion composed of alkyl/N-Lauroyl-glutamate/water. The diffraction peaks at low angle characteristic of LDH disappeared when the amount of alkyl reached a proper degree in the microemulsion, indicating that LDH layers might be delaminated. The delamination of LDH layers is proved by further carbonate-exchanged experiment. The delaminated LDH gives a larger pore volume, surface area and pore diameter than the intercalated counterpart. The length of alkyl groups affects the delamination of LDH. The longer is the length of alkyl group, the easier is the delamination of LDH achieved. The delaminated feasibility of LDH varies also with the chemical composition of the layers. Ni/Al-LDH is delaminated more easily than Zn/Al-LDH, and Zn/Al-LDH more easily than Mg/Al-LDH.