TY  - JOUR
AU  - Lefevre, Gregory
AU  - Cerovic, Ljiljana
AU  - Milonjić, Slobodan K.
AU  - Fedoroff, Michel
AU  - Finne, Joergen
AU  - Jaubertie, Anne
PY  - 2009
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3766
AB  - A set-up and a method were developed to determine the isoelectric point of metals and metallic alloys samples (stainless steels, inconel, zircaloy, aluminum and dural) by measuring the adhesion rate of negative latex particles. The concentration of polystyrene spheres with surface carboxylate groups (initially 0.5-1 mg L(-1)) in contact with metallic samples was measured as a function of pH and time by turbidimetry. The simulation of measurements by a model predicting the sticking coefficient based on DLVO theory was used for the determination of the isoelectric point from experimental results. It was found that the isoelectric points of aluminum (8.7) and dural (9.1), treated by boiling water, are close to those of hydrated aluminum oxides powders. For stainless steels, inconel and zircaloy, the values of isoelectric points were found to be between 2.4 and 3.0, far below the isoelectric points measured for metallic oxides constituting the alloy surface layer. This difference was explained by two different charging mechanisms: (1) deprotonation of hydroxyl groups on the surface of the metal oxide in suspension or as a thick layer. (2) adsorption of hydroxide ions on a metal surface covered by a thin oxide layer, as observed on hydrophobic surfaces. (C) 2009 Elsevier Inc. All rights reserved.
T2  - Journal of Colloid and Interface Science
T1  - Determination of isoelectric points of metals and metallic alloys by adhesion of latex particles
VL  - 337
IS  - 2
SP  - 449
EP  - 455
DO  - 10.1016/j.jcis.2009.05.005
ER  - 

@article{
author = "Lefevre, Gregory and Cerovic, Ljiljana and Milonjić, Slobodan K. and Fedoroff, Michel and Finne, Joergen and Jaubertie, Anne",
year = "2009",
abstract = "A set-up and a method were developed to determine the isoelectric point of metals and metallic alloys samples (stainless steels, inconel, zircaloy, aluminum and dural) by measuring the adhesion rate of negative latex particles. The concentration of polystyrene spheres with surface carboxylate groups (initially 0.5-1 mg L(-1)) in contact with metallic samples was measured as a function of pH and time by turbidimetry. The simulation of measurements by a model predicting the sticking coefficient based on DLVO theory was used for the determination of the isoelectric point from experimental results. It was found that the isoelectric points of aluminum (8.7) and dural (9.1), treated by boiling water, are close to those of hydrated aluminum oxides powders. For stainless steels, inconel and zircaloy, the values of isoelectric points were found to be between 2.4 and 3.0, far below the isoelectric points measured for metallic oxides constituting the alloy surface layer. This difference was explained by two different charging mechanisms: (1) deprotonation of hydroxyl groups on the surface of the metal oxide in suspension or as a thick layer. (2) adsorption of hydroxide ions on a metal surface covered by a thin oxide layer, as observed on hydrophobic surfaces. (C) 2009 Elsevier Inc. All rights reserved.",
journal = "Journal of Colloid and Interface Science",
title = "Determination of isoelectric points of metals and metallic alloys by adhesion of latex particles",
volume = "337",
number = "2",
pages = "449-455",
doi = "10.1016/j.jcis.2009.05.005"
}

Lefevre, G., Cerovic, L., Milonjić, S. K., Fedoroff, M., Finne, J.,& Jaubertie, A.. (2009). Determination of isoelectric points of metals and metallic alloys by adhesion of latex particles. in Journal of Colloid and Interface Science, 337(2), 449-455.
https://doi.org/10.1016/j.jcis.2009.05.005

Lefevre G, Cerovic L, Milonjić SK, Fedoroff M, Finne J, Jaubertie A. Determination of isoelectric points of metals and metallic alloys by adhesion of latex particles. in Journal of Colloid and Interface Science. 2009;337(2):449-455.
doi:10.1016/j.jcis.2009.05.005 .

Lefevre, Gregory, Cerovic, Ljiljana, Milonjić, Slobodan K., Fedoroff, Michel, Finne, Joergen, Jaubertie, Anne, "Determination of isoelectric points of metals and metallic alloys by adhesion of latex particles" in Journal of Colloid and Interface Science, 337, no. 2 (2009):449-455,
https://doi.org/10.1016/j.jcis.2009.05.005 . .

TY  - JOUR
AU  - Cerovic, Ljiljana
AU  - Lefevre, Gregory
AU  - Jaubertie, Anne
AU  - Fedoroff, Michel
AU  - Milonjić, Slobodan K.
PY  - 2009
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3623
AB  - An experimental circulating water loop has been constructed to study the deposition of hematite particles of average diameter 320 nm on polypropylene pipe walls in the ranges pH 4-11, Re 3300-17,700 at 25 degrees C. Real-time turbidimetric measurements were used to measure the deposited concentrations. Results showed that the deposition rate increased when pH decreased and when the flow rate increased. Adhesion was observed even under repulsive electrostatic conditions (pH GT 7), where the surfaces of hematite and polypropylene were both negative, indicating that the kinetic energy of at least a part of the particles Surpassed the electrostatic repulsive potentials. The experimental Curves Were fitted by a model assuming simultaneous adhesion and removal of particles, leading to adhesion and removal rate constants, whose values depend on pH and flow rate. Removal is negligible below pH 9. (c) 2008 Elsevier Inc. All rights reserved.
T2  - Journal of Colloid and Interface Science
T1  - Deposition of hematite particles on polypropylene walls in dynamic conditions
VL  - 330
IS  - 2
SP  - 284
EP  - 291
DO  - 10.1016/j.jcis.2008.10.079
ER  - 

@article{
author = "Cerovic, Ljiljana and Lefevre, Gregory and Jaubertie, Anne and Fedoroff, Michel and Milonjić, Slobodan K.",
year = "2009",
abstract = "An experimental circulating water loop has been constructed to study the deposition of hematite particles of average diameter 320 nm on polypropylene pipe walls in the ranges pH 4-11, Re 3300-17,700 at 25 degrees C. Real-time turbidimetric measurements were used to measure the deposited concentrations. Results showed that the deposition rate increased when pH decreased and when the flow rate increased. Adhesion was observed even under repulsive electrostatic conditions (pH GT 7), where the surfaces of hematite and polypropylene were both negative, indicating that the kinetic energy of at least a part of the particles Surpassed the electrostatic repulsive potentials. The experimental Curves Were fitted by a model assuming simultaneous adhesion and removal of particles, leading to adhesion and removal rate constants, whose values depend on pH and flow rate. Removal is negligible below pH 9. (c) 2008 Elsevier Inc. All rights reserved.",
journal = "Journal of Colloid and Interface Science",
title = "Deposition of hematite particles on polypropylene walls in dynamic conditions",
volume = "330",
number = "2",
pages = "284-291",
doi = "10.1016/j.jcis.2008.10.079"
}

Cerovic, L., Lefevre, G., Jaubertie, A., Fedoroff, M.,& Milonjić, S. K.. (2009). Deposition of hematite particles on polypropylene walls in dynamic conditions. in Journal of Colloid and Interface Science, 330(2), 284-291.
https://doi.org/10.1016/j.jcis.2008.10.079

Cerovic L, Lefevre G, Jaubertie A, Fedoroff M, Milonjić SK. Deposition of hematite particles on polypropylene walls in dynamic conditions. in Journal of Colloid and Interface Science. 2009;330(2):284-291.
doi:10.1016/j.jcis.2008.10.079 .

Cerovic, Ljiljana, Lefevre, Gregory, Jaubertie, Anne, Fedoroff, Michel, Milonjić, Slobodan K., "Deposition of hematite particles on polypropylene walls in dynamic conditions" in Journal of Colloid and Interface Science, 330, no. 2 (2009):284-291,
https://doi.org/10.1016/j.jcis.2008.10.079 . .