Studies on Synthesis and Properties of Aluminium Magnesium Hydroxide Positive Sol

Abstract

Abstract: A positive sol of aluminium magnesium hydroxide was synthesized by non-steady coprecipitation.The synthesis mechanism,shape,chemical composition, electrical property and thermal stability of colloidal particles were studied by X-ray diffraction, transmission electron microscope,chemical analysis,spectroanalysis and measuring of electrophoretic mobilities.The colloidal particles are tiny platelets with an average diameter of about 30 nm,and may aggregate with"oxygen-bridge"in water medium.In the process of synthesis,the peptization is the transformation process from amorphous to crystalline.The chemical compositions of particles are dependent on the composition of raw material.When the ratios of Mg/Al in raw material are 1:2,1:1 and 2:1,the chemical formulas of colloidal particles are Mg_0.27Al(OH)_3.07Cl_0.47·0. 86H₂O,Mg_0.43Al(OH)_3.72Cl_0.14·0.5H₂O, Mg_0.96Al(OH)_4.50Cl_0.42·1.45H₂O,respectively.The electrophoretic mobilities and thermal stability of the colloidal particles increase with increasing the content of magnesium in chemical composition of the particles.

Key words: Mixed metal hydroxide, Sol, Ultrafine particle

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HOU Wan-Guo, ZHANG Chun-Guang, SUN De-Jun, LIANG Xiao-Li, WANG Guo-Ting. Studies on Synthesis and Properties of Aluminium Magnesium Hydroxide Positive Sol[J]. Chem. J. Chinese Universities, 1995, 16(8): 1292.

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Studies on Synthesis and Properties of Aluminium Magnesium Hydroxide Positive Sol

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