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Issue 44, 2005
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Delamination and restacking of a layered double hydroxide with nitrate as counter anion

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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

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Publication details

The article was received on 04 Aug 2005, accepted on 07 Sep 2005 and first published on 03 Oct 2005


Article type: Paper
DOI: 10.1039/B511184F
J. Mater. Chem., 2005,15, 4695-4700

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    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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