Electrophoretic mobility of magnetite particles in high temperature water

Journal Article · Sat Jan 01 00:00:00 EST 2011 · Chemical Engineering Science

DOI:https://doi.org/10.1016/j.ces.2011.05.021· OSTI ID:1025420

Vidojkovic, Sonja ^[1]; Rodriguez-Santiago, V ^[2]; Fedkin, Mark V ^[1]; Wesolowski, David J ^[3]; Lvov, Serguei N ^[1]

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1. Pennsylvania State University
2. Oak Ridge National Laboratory (ORNL)
3. ORNL

Magnetite(Fe3O4) isoneofthemostcommonoxidesformingdepositsandparticulatephasesin industrialhightemperaturewatercircuits.Itscolloidalcharacteristicsplayaprincipalroleinthe mechanismofdepositformationandcanbeusedascontrollingfactorstopreventorminimizedeposit formationanddamageofindustrialpipelinesduetounder-depositcorrosion.Inthisstudy,ahigh temperatureparticleelectrophoresistechniquewasemployedtomeasurethezetapotentialatthe magnetite/waterinterface the parameterthatcontrolscolloidalstabilityofparticles,theiraggrega- tion, anddeposition.Themeasurementsweremadeattemperaturesupto200 1C overawiderangeofpH. The isoelectricpointsofmagnetite,atwhichthedepositionofparticlesisincreased,weredeterminedatpH 6.35, 6.00,5.25,and5.05fortemperatures25,100,150,and200 1C, respectively.Theobserved temperaturedependenceofzetapotentialandtheisoelectricpHpointofmagnetitecanhelptoexplain the extentofinteractionsbetweenthecolloidalparticlesandthesteelwallsurfacesunderhydro- thermalconditions,andindicatemethodsforcontrollingandmitigatingoxidedepositioninhigh temperaturewatercycles.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1025420
• Journal Information: Chemical Engineering Science, Vol. 66, Issue 18; ISSN 0009-2509
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CORROSION
DEPOSITION
ELECTROPHORESIS
MAGNETITE
OXIDES
PARTICULATES
PIPELINES
STABILITY
STEELS
TEMPERATURE DEPENDENCE
WATER