Influence of Drying Processes on Agglomeration and Grain Diameters of Magnesium Oxide Nanoparticles

ISSN： 0737-3937

Source： Drying Technology, Vol.25, Iss.4, 2007-04, pp. : 715-721

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Abstract

Magnesium hydroxide precipitate was prepared using magnesium chloride and urea as starting materials via a homogenous precipitation method. Before it was calcined to obtain magnesium oxide nanoparticles, the precipitate was pretreated and dried using different pretreatments and drying methods. The as-prepared magnesium oxide nanoparticles were characterized by transmission electron microscope and X-ray diffraction. The results show that when drying methods (except for supercritical CO2 extraction drying) are the same, grain diameters and agglomeration of magnesium oxide nanoparticles exhibit a similar trend and depend on pretreatment. The agglomeration of magnesium oxide nanoparticles is relevant with drying methods when pretreatments are same. The agglomeration of magnesium hydroxide particles is mostly induced by capillary pressure or surface tension.