Short-Range and Long-Range Aggregation of Particles
in the -Al₂O₃ Sol: II. Photometric and Ultramicroscopic
Investigation of the Aggregate Stability
of the Positively Charged -Al₂O₃ Sol

E. V. Golikova^a,*, L. M. Molodkina^b, L. L. Zagorskaya^a, and E. A. Garibin^c

^aGrebenshchikov Institute of Silicate Chemistry, Russian Academy of Sciences,
nab. Admirala Makarova 2, St. Petersburg, 199034 Russia

*e-mail: golikova@isc.nw.ru

^bSt. Petersburg State Polytechnical University, Politekhnicheskaya ul. 29, St. Petersburg, 195251 Russia

^cOOO Incrom, ul. Babushkina 36/1, St. Petersburg, 192171 Russia

Received February 4, 2010

Abstract—The aggregate stability of the positively charged -Al₂O₃ (alundum) sol has been investigated using
photometry and flow ultramicroscopy over a wide range of KCl concentrations. The data on the sol stability
have been compared with the results of the calculations in the framework of the extended Derjaguin–Landau–
Verwey–Overbeek theory. The parameters of the long-range structural forces for -Al₂O₃ particles have been
evaluated. The role of the far potential minimum in the sol stability has been discussed.

Key words: -Al₂O₃ (alundum) sol, barrierless coagulation, structural forces, flow ultramicroscopy

DOI: 10.1134/S1087659610050093

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