کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
610914 | 880662 | 2008 | 7 صفحه PDF | دانلود رایگان |

Zetametric measurements on suspensions of oxide particles (cobalt ferrite, nickel ferrite, and magnetite) representative of corrosion products from primary circuits of pressurized water reactors were performed at 25 and 70 °C in the presence of lithium and borate species. No effect of lithium ions was observed. Borate species cause a decrease of the isoelectric point (IEP), attributed to the sorption of borate as a negative complex MOB(OH)3−. A predictive model based on thermodynamic calculations (2-pK2-pK and diffuse layer models) of the surface acidity constants from the data of acid–base titrations combined with an empirical relationship between the surface potential Ψ0Ψ0 and the ζ potential determined by zetametry was developed. A whole set of parameters valid at 25 °C, in a range of ionic strength between 10−4 and 10−2 molL−1 and in a range of pH between 4 and 8, was determined for this model. Increase of temperature to 70 °C in the presence of borate results in a decrease of IEP for cobalt ferrite and an increase of the IEP for nickel ferrite.
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Journal: Journal of Colloid and Interface Science - Volume 328, Issue 1, 1 December 2008, Pages 34–40