Magnetic and microscopic characterization of magnetite nanoparticles adhered to clay surfaces

Cecilia Galindo-Gonzalez, Joshua M. Feinberg, Takeshi Kasama, Lionel Cervera Gontard, M. Pósfai, Ilona Kósa, Juan D G Duran, Jaime E. Gil, Richard J. Harrison, Rafal E. Dunin-Borkowski

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

When suspended in solution, clay platelets coated with nanometer-scale magnetite particles behave as magnetorheologic fluids that are important to a variety of industrial applications. Such dual-phase assemblages are also similar to natural aggregates that record the direction and intensity of the Earth's magnetic field in lake and marine depositional environments. This study characterizes the mineralogical structure and magnetic behavior of montmorillonite platelets coated with aggregates of nanometer-scale magnetite crystals. The distribution of magnetite crystal sizes in three different clay-magnetite assemblages was directly measured using conventional transmission electron microscopy and agrees within error with estimates derived from magnetic hysteresis measurements. Magnetic hysteresis and low field susceptibility measurements combined with electron holography experiments indicate that all three samples behave superparamagnetically at room temperature, and show increasing levels of single domain behavior as the samples are cooled to liquid nitrogen temperatures. At such low temperatures, magnetostatic interactions are observed to partially stabilize otherwise superparamagnetic grains in flux closure structures.

Original languageEnglish
Pages (from-to)1120-1129
Number of pages10
JournalAmerican Mineralogist
Volume94
Issue number8-9
DOIs
Publication statusPublished - Aug 2009

Fingerprint

Magnetite Nanoparticles
Ferrosoferric Oxide
magnetite
clays
Magnetic hysteresis
clay
nanoparticles
Platelets
platelets
hysteresis
Electron holography
holography
crystal
Bentonite
marine environments
Crystals
Magnetostatics
magnetostatics
Liquid nitrogen
montmorillonite

Keywords

  • Clay
  • Electron holography
  • Electron tomography
  • Granulometry
  • Magnetic properties
  • Magnetite
  • Smectite
  • TEM

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

Cite this

Galindo-Gonzalez, C., Feinberg, J. M., Kasama, T., Gontard, L. C., Pósfai, M., Kósa, I., ... Dunin-Borkowski, R. E. (2009). Magnetic and microscopic characterization of magnetite nanoparticles adhered to clay surfaces. American Mineralogist, 94(8-9), 1120-1129. https://doi.org/10.2138/am.2009.3167

Magnetic and microscopic characterization of magnetite nanoparticles adhered to clay surfaces. / Galindo-Gonzalez, Cecilia; Feinberg, Joshua M.; Kasama, Takeshi; Gontard, Lionel Cervera; Pósfai, M.; Kósa, Ilona; Duran, Juan D G; Gil, Jaime E.; Harrison, Richard J.; Dunin-Borkowski, Rafal E.

In: American Mineralogist, Vol. 94, No. 8-9, 08.2009, p. 1120-1129.

Research output: Contribution to journalArticle

Galindo-Gonzalez, C, Feinberg, JM, Kasama, T, Gontard, LC, Pósfai, M, Kósa, I, Duran, JDG, Gil, JE, Harrison, RJ & Dunin-Borkowski, RE 2009, 'Magnetic and microscopic characterization of magnetite nanoparticles adhered to clay surfaces', American Mineralogist, vol. 94, no. 8-9, pp. 1120-1129. https://doi.org/10.2138/am.2009.3167
Galindo-Gonzalez, Cecilia ; Feinberg, Joshua M. ; Kasama, Takeshi ; Gontard, Lionel Cervera ; Pósfai, M. ; Kósa, Ilona ; Duran, Juan D G ; Gil, Jaime E. ; Harrison, Richard J. ; Dunin-Borkowski, Rafal E. / Magnetic and microscopic characterization of magnetite nanoparticles adhered to clay surfaces. In: American Mineralogist. 2009 ; Vol. 94, No. 8-9. pp. 1120-1129.
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