High concentration aqueous magnetic fluids

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Vasilescu, Corina
dc.contributor.author Latikka, M.
dc.contributor.author Knudsen, K. D.
dc.contributor.author Garamus, V. M.
dc.contributor.author Socoliuc, V.
dc.contributor.author Turcu, Rodica
dc.contributor.author Tombácz, Etelka
dc.contributor.author Susan-Resiga, Daniela
dc.contributor.author Ras, R. H.A.
dc.contributor.author Vékás, L.
dc.date.accessioned 2018-09-04T11:14:01Z
dc.date.available 2018-09-04T11:14:01Z
dc.date.issued 2018-01-01
dc.identifier.citation Vasilescu , C , Latikka , M , Knudsen , K D , Garamus , V M , Socoliuc , V , Turcu , R , Tombácz , E , Susan-Resiga , D , Ras , R H A & Vékás , L 2018 , ' High concentration aqueous magnetic fluids : structure, colloidal stability, magnetic and flow properties ' Soft Matter , vol 14 , no. 32 , pp. 6648-6666 . DOI: 10.1039/c7sm02417g en
dc.identifier.issn 1744-683X
dc.identifier.issn 1744-6848
dc.identifier.other PURE UUID: bf7a4986-7b40-48c5-9229-2d524321ac3d
dc.identifier.other PURE ITEMURL: https://research.aalto.fi/en/publications/high-concentration-aqueous-magnetic-fluids(bf7a4986-7b40-48c5-9229-2d524321ac3d).html
dc.identifier.other PURE LINK: http://www.scopus.com/inward/record.url?scp=85051868836&partnerID=8YFLogxK
dc.identifier.other PURE FILEURL: https://research.aalto.fi/files/28348857/SCI_Vasilescu_Ras_et_al_High_magnetization_water_based_MFs_preprint2018.pdf
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/33819
dc.description | openaire: EC/H2020/725513/EU//SuperRepel
dc.description.abstract This paper is an in-depth analysis devoted to two basic types of water based magnetic fluids (MFs), containing magnetite nanoparticles with electrostatic and with electro-steric stabilization, both obtained by chemical coprecipitation synthesis under atmospheric conditions. The two sets of magnetic fluid samples, one with citric acid (MF/CA) and the other with oleic acid (MF/OA) coated magnetic nanoparticles, respectively, achieved saturation magnetization values of 78.20 kA m−1 for the electrostatically and 48.73 kA m−1 for the electro-sterically stabilized aqueous ferrofluids which are among the highest reported to date. A comprehensive comparative analysis combining electron microscopy, X-ray photoelectron spectroscopy, attenuated total reflectance Fourier transform infrared spectroscopy, vibrating sample magnetometry, small-angle X-ray and neutron scattering, dynamic light scattering and magneto-rheometry revealed similarities and essential differences on the microscopic and macroscopic level between the two kinds of water-based ferrofluids. While the saturation magnetization values are quite different, the hydrodynamic volume fractions of the highest concentration MF/CA and MF/OA samples are practically the same, due to the significantly different thicknesses of the particles' coating layers. The results of volume fraction dependent structure analyses over a large concentration range by small-angle X-ray and neutron scattering, correlated with magneto-rheological investigations for the electrostatically stabilized MFs, demonstrate formation of short chains of magnetic nanoparticles which are relatively stable against coagulation with increasing concentration, while for MFs with electro-steric stabilization, magnetic field and shear rate dependent loosely bound structures are observed. These particle structures in MF/OA samples manifest themselves already at low volume fraction values, which can be attributed mainly to magnetic interactions of larger size particles, besides non-magnetic interactions mediated by excess surfactant. en
dc.format.extent 19
dc.format.extent 6648-6666
dc.format.mimetype application/pdf
dc.language.iso en en
dc.relation info:eu-repo/grantAgreement/EC/H2020/725513/EU//SuperRepel
dc.relation.ispartofseries Soft Matter en
dc.relation.ispartofseries Volume 14, issue 32 en
dc.rights openAccess en
dc.subject.other Chemistry(all) en
dc.subject.other Condensed Matter Physics en
dc.subject.other 114 Physical sciences en
dc.subject.other 221 Nanotechnology en
dc.title High concentration aqueous magnetic fluids en
dc.type A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.description.version Peer reviewed en
dc.contributor.department Politehnica University of Timisoara
dc.contributor.department Department of Applied Physics
dc.contributor.department Institute for Energy Technology
dc.contributor.department Helmholtz-Zentrum Geesthacht - Centre for Materials and Coastal Research
dc.contributor.department Romanian Academy
dc.contributor.department National Institute for Research and Development of Isotopic and Molecular Technologies
dc.contributor.department University of Szeged
dc.contributor.department Department of Bioproducts and Biosystems en
dc.subject.keyword Chemistry(all)
dc.subject.keyword Condensed Matter Physics
dc.subject.keyword 114 Physical sciences
dc.subject.keyword 221 Nanotechnology
dc.identifier.urn URN:NBN:fi:aalto-201809044939
dc.identifier.doi 10.1039/c7sm02417g
dc.date.embargo info:eu-repo/date/embargoEnd/2019-07-03

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