Issue 44, 2005

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

Abstract

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.

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

Article information

Article type
Paper
Submitted
04 Aug 2005
Accepted
07 Sep 2005
First published
03 Oct 2005

J. Mater. Chem., 2005,15, 4695-4700

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

Q. Wu, A. Olafsen, Ø. B. Vistad, J. Roots and P. Norby, J. Mater. Chem., 2005, 15, 4695 DOI: 10.1039/B511184F

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