Short-Range and Long-Range Aggregation of Particles
in the -Al₂O₃ Sol: I. Investigation of the Aggregate Stability
of the Negatively Charged -Al₂O₃ Sol

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

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

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

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

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

^dSt. Petersburg State Chemical Pharmaceutical Academy, ul. Professora Popova 14, St. Petersburg, 197376 Russia

Received February 4, 2010

Abstract—The electrical surface properties and aggregate stability of the negatively charged -Al₂O₃ (alun-
dum) sol at pH 10.2 have been investigated over a wide range of KCl concentrations. The experimental data on
the sol stability have been compared with the results of the calculations performed 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.

Key words: electrical surface properties, barrierless coagulation, -Al₂O₃ (alundum) sol, parameters of struc-
tural forces

DOI: 10.1134/S1087659610040073

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