Delamination and restacking of a layered double hydroxide with nitrate as counter anion

被引:221
作者
Wu, QL
Olafsen, A
Vistad, OB
Roots, J
Norby, P
机构
[1] Univ Oslo, Dept Chem, N-0315 Oslo, Norway
[2] Univ Oslo, Ctr Mat Sci & Nanotechnol, N-0315 Oslo, Norway
[3] SINTEF, Mat & Chem, N-0314 Oslo, Norway
关键词
D O I
10.1039/b511184f
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
A layered double hydroxide (LDH) with nitrate as the counter anion (LDH- NO3 with Mg/Al = 3) was, for the first time, successfully delaminated in formamide under ultrasonic treatment. Atomic force microscopy (AFM) images showed that a large part of the LDH was delaminated into single and double brucite layers (0.7 - 1.4 nm in thickness). The nano-sheets had disk- like shapes with a diameter of ca. 20-40 nm. Findings from AFM were in good agreement with the average hydrodynamic diameter determined using dynamic light scattering. Powder X-ray diffraction pattern of LDH dispersed in formamide also confirmed that LDH-NO3 was exfoliated. The dispersions of LDH in formamide were stable and transparent up to a concentration of 40 g L-1. However, formation of transparent gels was observed at concentrations higher than 5 g L-1. Delaminated LDH could be restacked by adding sodium carbonate or ethanol.
引用
收藏
页码:4695 / 4700
页数:6
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