Synthesis and Characterization of Layered Double Hydroxides with a High Aspect Ratio
Tao, Qi, Zhang, Yuanming, Zhang, Xiang, Yuan, Peng, & He, Hongping (2006) Synthesis and Characterization of Layered Double Hydroxides with a High Aspect Ratio. Journal of Solid State Chemistry, 179(3), pp. 708-715.
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Abstract
A new route for synthesis of Mg/Al layered double hydroxide (Mg6Al2(OH)16(CO3)•4H2O) has been introduced, which can be considered as a modified calcination-rehydration method. Under the hydrothermal conditions, LDHs with a high aspect ratio were synthesized and characterized by inductively coupled plasma-atom emission spectrometer (ICP-AES), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), thermal measurement (TG-DTG) and scanning electron microscopy (SEM). XRD patterns display the crystalline enhanced with the increase of hydrothermal temperature and aging time. TG-DTG curves show the more stable LDHs were synthesized at higher temperature. SEM images indicate the lateral size of the synthesized LDHs locates at ca. 1 - 6 μm and the thickness at ca. 35 - 60 nm. And the particle size depends strongly on the treatment temperature and aging time. A buffer solution consisted of HCO3- and CO32- keeps the pH of reaction system in a certain range and offers a low supersaturated reaction circumstance. This is of high importance for the formation of LDHs with a high aspect ratio.
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| ID Code: | 4689 |
|---|---|
| Item Type: | Journal Article |
| Keywords: | Layered double hydroxides, Calcination, rehydration method, High aspect ratio, Hydrothermal treatment, Scanning electron microscopy |
| DOI: | 10.1016/j.jssc.2005.11.023 |
| ISSN: | 0022-4596 |
| Divisions: | Past > QUT Faculties & Divisions > Faculty of Science and Technology |
| Copyright Owner: | Copyright 2006 Elsevier |
| Copyright Statement: | Reproduced in accordance with the copyright policy of the publisher. |
| Deposited On: | 13 Jul 2006 |
| Last Modified: | 09 Jun 2010 22:33 |
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