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Magnetic and microscopic characterization of magnetite nanoparticles adhered to clay surfaces
-
Cecilia Galindo-Gonzalez
,
Takeshi Kasama
Veröffentlicht/Copyright:
1. April 2015
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 nanometerscale 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.
Keywords : Magnetite; clay; smectite; TEM; electron holography; electron tomography; granulometry; magnetic properties
Received: 2008-12-6
Accepted: 2009-4-19
Published Online: 2015-4-1
Published in Print: 2009-8-1
© 2015 by Walter de Gruyter Berlin/Boston
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Schlagwörter für diesen Artikel
Magnetite;
clay;
smectite;
TEM;
electron holography;
electron tomography;
granulometry;
magnetic properties
Artikel in diesem Heft
- Bonded interactions in silica polymorphs, silicates, and siloxane molecules
- Spatially heterogeneous burial and high-P/T metamorphism in the Crescent Formation, Olympic Peninsula, Washington
- Quantitative microstructural characterization of natrojarosite scale formed during high-pressure acid leaching of lateritic nickel ore
- Magnetic and microscopic characterization of magnetite nanoparticles adhered to clay surfaces
- Single crystal growth of wadsleyite
- Elastic behavior and phase stability of pollucite, a potential host for nuclear waste
- Crystal structure determination of anandite-2M mica
- Excess heat capacity and entropy of mixing in high structural state plagioclase
- Cannibalization of an amphibole-rich andesitic progenitor induced by caldera-collapse during the Matahina eruption: Evidence from amphibole compositions
- Experimental constraints on rutile saturation during partial melting of metabasalt at the amphibolite to eclogite transition, with applications to TTG genesis
- Mineralogical stability of phyllosilicates in hyperalkaline fluids: Influence of layer nature, octahedral occupation and presence of tetrahedral Al
- Plumbophyllite, a new species from the Blue Bell claims near Baker, San Bernardino County, California
- Simultaneous aluminum, silicon, and sodium coordination changes in 6 GPa sodium aluminosilicate glasses
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- The carbonatation of gypsum: Pathways and pseudomorph formation
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- Thermochemistry of a synthetic Na-Mg-rich triple-chain silicate: Determination of thermodynamic variables
- Change in compressibility of δ-AlOOH and δ-AlOOD at high pressure: A study of isotope effect and hydrogen-bond symmetrization
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