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dc.contributor.author
Hirt, Ann M.
dc.contributor.author
Liu, Pengfei
dc.date.accessioned
2021-02-19T10:03:17Z
dc.date.available
2021-02-17T10:04:49Z
dc.date.available
2021-02-19T10:03:17Z
dc.date.issued
2021-02-16
dc.identifier.issn
1863-4621
dc.identifier.issn
1863-463X
dc.identifier.other
10.3389/feart.2020.586913
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/469938
dc.identifier.doi
10.3929/ethz-b-000469938
dc.description.abstract
Obtaining an estimate of the relative proportion of superparamagnetic (SP) to stable single- domain (SSD) particle sizes in a material can be useful in evaluating environmental conditions in natural materials, or in understanding the homogeneity of particle size and the degree of agglomeration in synthesized particles. Frequency dependent magnetic susceptibility is one of the most common methods used to identify SP particles in a material. The ability to detect SP particles, however, will be dependent on the !eld frequencies that can be applied. This study is concerned with evaluating three methods to estimate the SP content in a mixture of SSD and SP magnetite. We examine the use of the Day-Dunlop plot, !rst-order reversal curves (FORC) and principal component analysis (PCA), and the relationship between the reversible and irreversible magnetization as methods to evaluate qualitatively the relative contributions of SSD and SP magnetite in a material. Two series of mixtures of coated nanoparticles with a mean diameter of 20 and 11 nm are used as the SP end member and magnetosomes or intact magnetotactic bacterium of Magnetospirillum gryphiswaldense as the SSD end member. The Day- Dunlop plot tracks the progressive change in hysteresis properties with growing SP concentration. PCA of FORC data is sensitive in detecting differences in the SP component, when the SP particle size are not too small; otherwise the ratio between the reversible and irreversible magnetization can better assess differences. The results from the series are used to evaluate the relative SP content in three further sets of samples: biological tissue, synthetic nanoparticles, and samples from natural environments, to assess the strengths and weaknesses in each approach.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Frontiers Media SA
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/4.0/
dc.subject
Magnetite
en_US
dc.subject
superparamagnetic-single domain mixtures
en_US
dc.subject
Day-Dunlop plot
en_US
dc.subject
FORC- PCA analysis
en_US
dc.subject
reversible-irreversible magnetization
en_US
dc.title
Estimating the Relative Concentration of Superparamagnetic and Stable Single Domain Particles in Geological, Biological, and Synthetic Materials
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 4.0 International
ethz.journal.title
Frontiers in Earth Sciences
ethz.journal.volume
8
en_US
ethz.journal.abbreviated
FRONTIERS
ethz.pages.start
586913
en_US
ethz.size
14 p.
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
Lausanne
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02330 - Dep. Erdwissenschaften / Dep. of Earth Sciences::02506 - Institut für Geophysik / Institute of Geophysics::03734 - Jackson, Andrew / Jackson, Andrew
en_US
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02330 - Dep. Erdwissenschaften / Dep. of Earth Sciences::02506 - Institut für Geophysik / Institute of Geophysics::03734 - Jackson, Andrew / Jackson, Andrew
en_US
ethz.date.deposited
2021-02-17T10:05:04Z
ethz.source
FORM
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2021-02-19T10:03:29Z
ethz.rosetta.lastUpdated
2022-03-29T05:18:30Z
ethz.rosetta.versionExported
true
ethz.COinS
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