Stability of zirconia sol in the presence of various inorganic electrolytes

• Main Authors: Marković Jelena P., Milonjić Slobodan K., Leovac Vukadin M.
• Format: Article
• Language: English
• Published: Serbian Chemical Society 2013-01-01
• Series: Journal of the Serbian Chemical Society
• Subjects: zirconia sol; stability; electrolytes; critical coagulation concentration; potentiometric titration
• Online Access: http://www.doiserbia.nb.rs/img/doi/0352-5139/2013/0352-51391300118M.pdf

Zirconia sol was prepared from zirconium oxychloride solutions by forced hydrolysis at 102ºC. The prepared sol consisted of almost spherical, monoclinic, hydrated zirconia particles 61 nm in diameter. The stability of zirconia sol in the presence of various inorganic electrolytes (LiCl, NaCl, KCl, CsCl, KBr, KI, KNO3, and K2SO4) was studied by potentiometric titration method. Dependence of the critical concentration of coagulation (CCC) on the dispersion pH was determined for all studied electrolytes. The critical coagulation concentration values, for all investigated electrolytes, are lower at higher pH. These values for all 1:1 electrolytes are equal in the range of experimental error. For a given pH value, CCCs of K2SO4 are 3-4 orders of magnitude lower than the corresponding values for 1:1 electrolytes. [Projekat Ministarstva nauke republike Srbije, br. III 45012]