Shape and Size Control of Nano Dispersed Mg/Al Layered Double Hydroxide

Authors: Panda, H. S.; Srivastava, R.; Bahadur, D.

Source: Journal of Nanoscience and Nanotechnology, Volume 8, Number 8, August 2008 , pp. 4218-4223(6)

Publisher: American Scientific Publishers

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Abstract:

Controlling the shape and size of the layered inorganic–organic hybrid particles is a challenge with conventional methods of synthesis. The co-precipitation method has been modified to synthesize Mg/Al Layered double hydroxide by controlling the particle growth using ultrasonic wave at the time of nucleation. In this project, magnesium and aluminum ions were considered as model systems with carbonate anion as intercalating agent. The resulting particles are compared with those of LDHs produced by conventional co-precipitation method at constant pH. Powder X-ray diffraction confirmed formation of the layered double hydroxide phases having crystallite size 19–20 nm in both 'a' and 'c' crystallographic directions. Transmission electron microscope and dynamic light scattering revealed nano disperse hexagonal platelets with narrow size distribution and average size was around 48 nm. The modified method reduces the particle size, increases the surface charge, narrows down the size distribution and also reduces the aspect ratio of the particles. Therefore, it is suggested that low amplitude ultrasonic wave prevents the aggregation of the nuclei, thus restricting the particle growth and results in uniform size particles.

Keywords: CO-PRECIPITATION; LAYERED DOUBLE HYDROXIDE; SIZE DISTRIBUTION; ZETA POTENTIAL

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2008.AN22

Publication date: August 1, 2008

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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