Effects of magnetic field gradients on the aggregation dynamics of colloidal magnetic nanoparticles
Fil: Heinrich, Dirk. Technische Universität Berlin. Institut für Festkörperphysik; Germany.
| Main Authors: | , , , , , , , , |
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| Format: | acceptedVersion |
| Language: | eng |
| Published: |
2022
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| Subjects: | |
| Online Access: | http://hdl.handle.net/11086/28168 |
| _version_ | 1801212541467099136 |
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| author | Heinrich, Dirk Goñi, Alejandro R. Osán, Tristán Martín Cerioni, Lucas Matías Ceferino Smessaert, Anton Klapp, Sabine H. L. Faraudo, Jordi Pusiol, Daniel José Thomsen, Christian |
| author_facet | Heinrich, Dirk Goñi, Alejandro R. Osán, Tristán Martín Cerioni, Lucas Matías Ceferino Smessaert, Anton Klapp, Sabine H. L. Faraudo, Jordi Pusiol, Daniel José Thomsen, Christian |
| author_sort | Heinrich, Dirk |
| collection | Repositorio Digital Universitario |
| description | Fil: Heinrich, Dirk. Technische Universität Berlin. Institut für Festkörperphysik; Germany. |
| format | acceptedVersion |
| id | rdu-unc.28168 |
| institution | Universidad Nacional de Cordoba |
| language | eng |
| publishDate | 2022 |
| record_format | dspace |
| spelling | rdu-unc.281682022-10-13T11:08:49Z Effects of magnetic field gradients on the aggregation dynamics of colloidal magnetic nanoparticles Heinrich, Dirk Goñi, Alejandro R. Osán, Tristán Martín Cerioni, Lucas Matías Ceferino Smessaert, Anton Klapp, Sabine H. L. Faraudo, Jordi Pusiol, Daniel José Thomsen, Christian Magnetic colloids Ferrofluids Aggregation dynamics Low-Field nuclear magnetic resonance acceptedVersion Fil: Heinrich, Dirk. Technische Universität Berlin. Institut für Festkörperphysik; Germany. Fil: Goñi, Alejandro R. Institución Catalana de Investigación y Estudios Avanzados; España. Fil: Goñi, Alejandro. Consejo Superior de Investigaciones Científicas. Instituto de Ciencia de Materiales de Barcelona; España. Fil: Osán, Tristán Martín. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física; Argentina. Fil: Osán, Tristán Martín. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Fil: Cerioni, Lucas Matías Ceferino. Spinlock; Argentina. Fil: Cerioni, Lucas Matías Ceferino. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Fil: Smessaert, Anton. Technical University Berlin. Institute of Theoretical Physics; Germany. Fil: Klapp, Sabine H. L. Technical University Berlin. Institute of Theoretical Physics; Germany. Fil: Faraudo, Jordi. Consejo Superior de Investigaciones Científicas. Instituto de Ciencia de Materiales de Barcelona; España. Fil: Pusiol, Daniel José. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Fil: Thomsen, Christian. Technische Universität Berlin. Institut für Festkörperphysik; Germany. We have used low-field 1H nuclear-magnetic resonance (NMR) spectroscopy and molecular dynamics (MD) to investigate the aggregation dynamics of magnetic particles in ionic ferrofluids (IFFs) in the presence of magnetic field gradients. At the beginning of the experiments, the measured NMR spectra were broad and asymmetric, exhibiting two features attributed to different dynamical environments of water protons, depending on the local strength of the field gradients. Hence, the spatial redistribution of the magnetic particles in the ferrofluid caused by the presence of an external magnetic field in a time scale of minutes can be monitored in real time, following the changes in the features of the NMR spectra during a period of about an hour. As previously reported [Heinrich et al., Phys. Rev. Lett., 2011, 106, 208301], in the homogeneous magnetic field of a NMR spectrometer, the aggregation of the particles of the IFF proceeds in two stages. The first stage corresponds to the gradual aggregation of monomers prior to and during the formation of chain-like structures. The second stage proceeds after the chains have reached a critical average length, favoring lateral association of the strings into hexagonal zipped-chain superstructures or bundles. In this work, we focus on the influence of a strongly inhomogeneous magnetic field on the aforementioned aggregation dynamics. The main observation is that, as the sample is immersed in a certain magnetic field gradient and kept there for a time tinh, magnetophoresis rapidly converts the ferrofluid into an aggregation state which finds its correspondence to a state on the evolution curve of the pristine sample in a homogeneous field. From the degree of aggregation reached at the time tinh, the IFF sample just evolves thereafter in the homogeneous field of the NMR spectrometer in exactly the same way as the pristine sample. The final equilibrium state always consists of a colloidal suspension of zipped-chain bundles with the chain axes aligned along the magnetic field direction. acceptedVersion Fil: Heinrich, Dirk. Technische Universität Berlin. Institut für Festkörperphysik; Germany. Fil: Goñi, Alejandro R. Institución Catalana de Investigación y Estudios Avanzados; España. Fil: Goñi, Alejandro. Consejo Superior de Investigaciones Científicas. Instituto de Ciencia de Materiales de Barcelona; España. Fil: Osán, Tristán Martín. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física; Argentina. Fil: Osán, Tristán Martín. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Fil: Cerioni, Lucas Matías Ceferino. Spinlock; Argentina. Fil: Cerioni, Lucas Matías Ceferino. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Fil: Smessaert, Anton. Technical University Berlin. Institute of Theoretical Physics; Germany. Fil: Klapp, Sabine H. L. Technical University Berlin. Institute of Theoretical Physics; Germany. Fil: Faraudo, Jordi. Consejo Superior de Investigaciones Científicas. Instituto de Ciencia de Materiales de Barcelona; España. Fil: Pusiol, Daniel José. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Fil: Thomsen, Christian. Technische Universität Berlin. Institut für Festkörperphysik; Germany. Física Atómica, Molecular y Química (física de átomos y moléculas incluyendo colisión, interacción con radiación, resonancia magnética, Moessbauer Efecto.) 2022-08-12T15:09:07Z 2022-08-12T15:09:07Z 2015 article http://hdl.handle.net/11086/28168 eng https://doi.org/10.1039/C5SM00541H Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ Impreso; Electrónico y/o Digital ISSN: 1744-683X e-ISSN: 1744-6848 |
| spellingShingle | Magnetic colloids Ferrofluids Aggregation dynamics Low-Field nuclear magnetic resonance Heinrich, Dirk Goñi, Alejandro R. Osán, Tristán Martín Cerioni, Lucas Matías Ceferino Smessaert, Anton Klapp, Sabine H. L. Faraudo, Jordi Pusiol, Daniel José Thomsen, Christian Effects of magnetic field gradients on the aggregation dynamics of colloidal magnetic nanoparticles |
| title | Effects of magnetic field gradients on the aggregation dynamics of colloidal magnetic nanoparticles |
| title_full | Effects of magnetic field gradients on the aggregation dynamics of colloidal magnetic nanoparticles |
| title_fullStr | Effects of magnetic field gradients on the aggregation dynamics of colloidal magnetic nanoparticles |
| title_full_unstemmed | Effects of magnetic field gradients on the aggregation dynamics of colloidal magnetic nanoparticles |
| title_short | Effects of magnetic field gradients on the aggregation dynamics of colloidal magnetic nanoparticles |
| title_sort | effects of magnetic field gradients on the aggregation dynamics of colloidal magnetic nanoparticles |
| topic | Magnetic colloids Ferrofluids Aggregation dynamics Low-Field nuclear magnetic resonance |
| url | http://hdl.handle.net/11086/28168 |
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