TY - JOUR
T1 - Electrophoretic mobility of magnetite particles in high temperature water
AU - Vidojkovic, Sonja
AU - Rodriguez-Santiago, Victor
AU - Fedkin, Mark V.
AU - Wesolowski, David J.
AU - Lvov, Serguei N.
N1 - Funding Information:
We thank Dr. Jorgen Rosenqvist for useful discussions during his visit at Penn State University. This research was supported in part by the National Science Foundation ( EAR 07-32559 ), the Division of Chemical Sciences, Geosciences, and Biosciences, Office of Basic Energy Sciences, U.S. Department (DJW and SNL) through contract with Oak Ridge National Laboratory ( DE-AC05-00OR22725 ), and by the United States Department of State through a Fulbright Grant provided to the first author of the paper (SV).
PY - 2011/9/15
Y1 - 2011/9/15
N2 - Magnetite (Fe3O4) is one of the most common oxides forming deposits and particulate phases in industrial high temperature water circuits. Its colloidal characteristics play a principal role in the mechanism of deposit formation and can be used as controlling factors to prevent or minimize deposit formation and damage of industrial pipelines due to under-deposit corrosion. In this study, a high temperature particle electrophoresis technique was employed to measure the zeta potential at the magnetite/water interface-the parameter that controls colloidal stability of particles, their aggregation, and deposition. The measurements were made at temperatures up to 200°C over a wide range of pH. The isoelectric points of magnetite, at which the deposition of particles is increased, were determined at pH 6.35, 6.00, 5.25, and 5.05 for temperatures 25, 100, 150, and 200°C, respectively. The observed temperature dependence of zeta potential and the isoelectric pH point of magnetite can help to explain the extent of interactions between the colloidal particles and the steel wall surfaces under hydrothermal conditions, and indicate methods for controlling and mitigating oxide deposition in high temperature water cycles.
AB - Magnetite (Fe3O4) is one of the most common oxides forming deposits and particulate phases in industrial high temperature water circuits. Its colloidal characteristics play a principal role in the mechanism of deposit formation and can be used as controlling factors to prevent or minimize deposit formation and damage of industrial pipelines due to under-deposit corrosion. In this study, a high temperature particle electrophoresis technique was employed to measure the zeta potential at the magnetite/water interface-the parameter that controls colloidal stability of particles, their aggregation, and deposition. The measurements were made at temperatures up to 200°C over a wide range of pH. The isoelectric points of magnetite, at which the deposition of particles is increased, were determined at pH 6.35, 6.00, 5.25, and 5.05 for temperatures 25, 100, 150, and 200°C, respectively. The observed temperature dependence of zeta potential and the isoelectric pH point of magnetite can help to explain the extent of interactions between the colloidal particles and the steel wall surfaces under hydrothermal conditions, and indicate methods for controlling and mitigating oxide deposition in high temperature water cycles.
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U2 - 10.1016/j.ces.2011.05.021
DO - 10.1016/j.ces.2011.05.021
M3 - Article
AN - SCOPUS:79960273099
SN - 0009-2509
VL - 66
SP - 4029
EP - 4035
JO - Chemical Engineering Science
JF - Chemical Engineering Science
IS - 18
ER -