Effects of Nitric Acid Concentration on the Stability of Alumina Sols

武汉理工大学学报-材料科学版(英文版), 2006, 21(1): 102-105.

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1.Key Laboratory of Silicate Materials Science and Engineering, Wuhan University of Technology, Ministry of Education, Wuhan 430070, China

2.Key Laboratory of Silicate Materials Science and Engineering, Wuhan University of Technology, Ministry of Education, Wuhan 430070, China

3.Key Laboratory of Silicate Materials Science and Engineering, Wuhan University of Technology, Ministry of Education, Wuhan 430070, China

4.Key Laboratory of Silicate Materials Science and Engineering, Wuhan University of Technology, Ministry of Education, Wuhan 430070, China

5.Key Laboratory of Silicate Materials Science and Engineering, Wuhan University of Technology, Ministry of Education, Wuhan 430070, China

基金项目: 教育部重点研究项目(99087) Foundation for University Key Teacher of the Ministry of Education

Effects of Nitric Acid Concentration on the Stability of Alumina Sols

Keywords： alumina sol

Alumina sols with a mlar ratio of 1: 50 between aluminum sec- butoxide ( ASB ) and H2 O werefabricated by adding various amounts of nitric acid.The particle shape, zeta potential, polydispersity and effective particle size of alumina sol were examined by a TEM, a zeta PALS granularity analyzer and a zetaPALS zeta potential analyzer, respectively.By analyzing the change of zeta potential and double- layer thickness with nitric acid concentration, the potential energy curves of colloidal particles were mapped on the basis of DLVO theory, and the effects of nitric acid concentration on the stability of alumina sols were intensively studied.The results show that for the alumina sols with a mol ratio of 1: 50 between ASB and H2 O, the total interaction energy of the colloidal particle is at a maximum when the nitric acid concentration is 0.22 mol/ L.Therefore, the stability of the colloid reaches optimum at the nitric acid concentration of 0.22 mol/L.

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Effects of Nitric Acid Concentration on the Stability of Alumina Sols

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