Chain formation in a magnetic fluid under the influence of strong external magnetic fields studied by small angle neutron scattering

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DOIResolve DOI: http://doi.org/10.1039/c1sm05104k
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TypeArticle
Journal titleSoft Matter
ISSN1744-683X
Volume7
Issue14
Pages66786683; # of pages: 6
SubjectChain formation; Chain segments; Chainlike structure; External magnetic field; In-situ; Magnetic dipole-dipole interaction; Magnetic field line; Magnetic particle; Maximum correlations; Particle chain; Scattering vectors; Strong magnetic fields; Agglomeration; Cobalt; Electric dipole moments; Magnetic fields; Magnetic fluids; Neutron scattering; Magnetic bubbles
AbstractWe studied the aggregation of magnetic particles into chain-like structures in a cobalt-based magnetic fluid, exposed to external magnetic fields. The length of chain segments in very strong magnetic fields of up to 2 Tesla was measured in situ using small angle neutron scattering. Arrangement of the magnetic particles was studied with the scattering vector Q aligned parallel to the magnetic field lines, and at angles of 30°and 60°with respect to B. Although chains several hundred particles in length were predicted, we observe a maximum correlation length of ∼65 nm equivalent to 3-4 particles up to highest fields. We speculate that the interaction between chains, i.e., the interplay between the entropy and energy of the system combined with the particular properties of the magnetic dipole-dipole interaction ultimately decide the length of the particle chains. © 2011 The Royal Society of Chemistry.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Canadian Neutron Beam Centre (CNBC-CCFN)
Peer reviewedYes
NPARC number21271070
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Record identifier6a671a7e-ca44-4730-ad7b-a7e2f018ae36
Record created2014-03-24
Record modified2016-05-09
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