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Sánchez PA, Cerrato A, Cerdà JJ, Bona-Casas C, Sintes T, Massó J. Dynamic response of a ferromagnetic nanofilament under rotating fields: effects of flexibility, thermal fluctuations and hydrodynamics. NANOSCALE 2024; 16:11724-11738. [PMID: 38864189 DOI: 10.1039/d4nr01034e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2024]
Abstract
Using nonequilibrium computer simulations, we study the response of ferromagnetic nanofilaments, consisting of stabilized one dimensional chains of ferromagnetic nanoparticles, under external rotating magnetic fields. In difference with their analogous microscale and stiff counterparts, which have been actively studied in recent years, nonequilibrium properties of rather flexible nanoparticle filaments remain mostly unexplored. By progressively increasing the modeling details, we are able to evidence the qualitative impact of main interactions that can not be neglected at the nanoscale, showing that filament flexibility, thermal fluctuations and hydrodynamic interactions contribute independently to broaden the range of synchronous frequency response in this system. Furthermore, we also show the existence of a limited set of characteristic dynamic filament configurations and discuss in detail the asynchronous response, which at finite temperature becomes probabilistic.
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Affiliation(s)
- Pedro A Sánchez
- Physics Department, University of the Balearic Islands, 07122 Palma, Spain.
| | - Antonio Cerrato
- Physics Department, University of the Balearic Islands, 07122 Palma, Spain.
| | - Joan J Cerdà
- Physics Department, University of the Balearic Islands, 07122 Palma, Spain.
| | - Carles Bona-Casas
- Physics Department, University of the Balearic Islands, 07122 Palma, Spain.
| | - Tomás Sintes
- Instituto de Física Interdisciplinar y Sistemas Complejos, IFISC (UIB-CSIC), University of the Balearic Islands, 07122 Palma, Spain
| | - Joan Massó
- Physics Department, University of the Balearic Islands, 07122 Palma, Spain.
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Mostarac D, Kantorovich SS. Rheology of a Nanopolymer Synthesized through Directional Assembly of DNA Nanochambers, for Magnetic Applications. Macromolecules 2022; 55:6462-6473. [PMID: 35966117 PMCID: PMC9367010 DOI: 10.1021/acs.macromol.2c00738] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2022] [Revised: 06/09/2022] [Indexed: 11/29/2022]
Abstract
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We present a numerical study of the effects of monomer
shape and
magnetic nature of colloids on the behavior of a single magnetic filament
subjected to the simultaneous action of shear flow and a stationary
external magnetic field perpendicular to the flow. We find that based
on the magnetic nature of monomers, magnetic filaments exhibit a completely
different phenomenology. Applying an external magnetic field strongly
inhibits tumbling only for filaments with ferromagnetic monomers.
Filament orientation with respect to the flow direction is in this
case independent of monomer shape. In contrast, reorientational dynamics
in filaments with superparamagnetic monomers are not inhibited by
applied magnetic fields, but enhanced. We find that the filaments
with spherical, superparamagnetic monomers, depending on the flow
and external magnetic field strength, assume semipersistent, collapsed,
coiled conformations, and their characteristic time of tumbling is
a function of field strength. However, external magnetic fields do
not affect the characteristic time of tumbling for filaments with
cubic, superparamagnetic monomers, but increase how often tumbling
occurs.
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Affiliation(s)
- Deniz Mostarac
- Faculty of Physics, University of Vienna, Boltzmanngasse 5, 1090 Vienna, Austria
- Research Platform MMM Mathematics-Magnetism-Materials, 1090 Vienna, Austria
| | - Sofia S. Kantorovich
- Faculty of Physics, University of Vienna, Boltzmanngasse 5, 1090 Vienna, Austria
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Novak EV, Pyanzina ES, Gupalo MA, Mauser NJ, Kantorovich SS. Structural transitions and magnetic response of supramolecular magnetic polymerlike structures with bidisperse monomers. Phys Rev E 2022; 105:054601. [PMID: 35706172 DOI: 10.1103/physreve.105.054601] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Accepted: 04/14/2022] [Indexed: 06/15/2023]
Abstract
Supramolecular magnetic polymerlike (SMP) structures are nanoscaled objects that combine the flexibility of polymeric conformations and controllability of magnetic nanoparticles. The advantage provided by the presence of permanent cross-linkers is that even at high temperature, a condition at which entropy dominates over magnetic interactions, the length and the topology of the SMP structures are preserved. On cooling, however, preexistent bonds constrain thermodynamically equilibrium configurations, making a low-temperature regime for SMP structures worth investigating in detail. Moreover, making SMP structures with perfectly monodisperse monomers has been a challenge. Thus, the second open problem in the application of SMP structures is the missing understanding of the polydispersity impact on their structural and magnetic properties. Here extensive Langevin dynamics simulations combined with parallel tempering method are used to investigate SMP structures of four different types, i.e., chainlike, Y-like, X-like, and ringlike, composed of monomers of two different sizes. Our results show that the presence of small particles in SMP structures can qualitatively change the magnetic response at low temperature, making those structures surprisingly more magnetically responsive than their monodisperse counterparts.
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Affiliation(s)
- Ekaterina V Novak
- Institute of Natural Sciences and Mathematics, Ural Federal University, Ekaterinburg 620083, Russian Federation
| | - Elena S Pyanzina
- Institute of Natural Sciences and Mathematics, Ural Federal University, Ekaterinburg 620083, Russian Federation
| | - Marina A Gupalo
- Institute of Natural Sciences and Mathematics, Ural Federal University, Ekaterinburg 620083, Russian Federation
| | - Norbert J Mauser
- Research Platform MMM Mathematics-Magnetism-Material, c/o Faculty of Mathematics, University of Vienna, 1090 Vienna, Austria
| | - Sofia S Kantorovich
- Faculty of Physics, Computational and Soft Matter Physics, University of Vienna, 1090 Vienna, Austria
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Cerdà JJ, Bona-Casas C, Cerrato A, Sintes T, Massó J. Colloidal magnetic brushes: influence of the magnetic content and presence of short-range attractive forces in the micro-structure and field response. SOFT MATTER 2021; 17:5780-5791. [PMID: 34027950 DOI: 10.1039/d0sm02006k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The behaviour of supramolecular brushes, whose filaments are composed of sequences of magnetic and non-magnetic colloidal particles, has been studied using Langevin dynamics simulations. Two types of brushes have been considered: sticky or Stockmayer brushes (SB) and non-sticky magnetic brushes (NSB). In both cases, the microstructure and the collective behaviour have been analysed for a wide range of magnetic field strengths including the zero-field case, and negative fields. The results show that, for the same magnetic content, SB placed in a magnetic field present an extensibility up to two times larger than NSB. The analysis of the microstructure of SB at zero field shows that magnetic particles belonging to different filaments in the brush self-organize into ring and chain aggregates, while magnetic colloids in NSB mainly remain in a non-aggregated state. Clustering among magnetic particles belonging to different filaments is observed to gradually fade away as the magnetic content of SB filaments increases towards 100%. Under an external field, SB are observed to form chains, threads and sheets depending on the magnetic content and the applied field strength. The chain-like clusters in SB are observed to decrease in size as the magnetic content in the filaments increases. A non-monotonic field dependence is observed for the average size of these clusters. In spite of the very different microstructure, both NSB and SB are observed to have a very similar magnetization, especially in high strength fields.
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Affiliation(s)
- Joan J Cerdà
- Dpt. de Física UIB i Institut d'Aplicacions Computacionals de Codi Comunitari (IAC3), Campus UIB, E-07122 Palma de Mallorca, Spain.
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Erin KV, Belykh SS. Light Diffraction in Magnetic Emulsions with High Interfacial Tension. COLLOID JOURNAL 2020. [DOI: 10.1134/s1061933x20060046] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Cerdà JJ, Bona-Casas C, Cerrato A, Novak EV, Pyanzina ES, Sánchez PA, Kantorovich S, Sintes T. Magnetic responsive brushes under flow in strongly confined slits: external field control of brush structure and flowing particle mixture separation. SOFT MATTER 2019; 15:8982-8991. [PMID: 31528962 DOI: 10.1039/c9sm01285k] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
In the present work magnetic brushes under flow conditions and confined inside narrow slits have been studied using Langevin dynamics simulations. It has been observed that the structural properties of these confined magnetic brushes can be tuned via the application of an external magnetic field, and this control can be exerted with a relatively low content of magnetic colloidal particles in the filaments that form the brushes (20% in the present study). The potential of these brushes to perform a separation process of a size-bidispersed mixture of free non-magnetic colloidal particles flowing through the slit has also been explored. Numerical results show that it is possible to induce a two-fold effect on the bidispersed particle flow: a lateral separation of the two types of flowing colloidal particles and an enhancement of the differences in their velocities. These two features are key elements sought in separation processes and could be very relevant in the design of new chromatographic columns and microfluid separation devices.
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Affiliation(s)
- Joan J Cerdà
- Dpt. de Física UIB i Institut d'Aplicacions Computacionals de Codi Comunitari (IAC3), Campus UIB, E-07122 Palma de Mallorca, Spain.
| | - Carles Bona-Casas
- Dpt. de Física UIB i Institut d'Aplicacions Computacionals de Codi Comunitari (IAC3), Campus UIB, E-07122 Palma de Mallorca, Spain.
| | - Antonio Cerrato
- Dpt. de Física UIB i Institut d'Aplicacions Computacionals de Codi Comunitari (IAC3), Campus UIB, E-07122 Palma de Mallorca, Spain.
| | | | - Elena S Pyanzina
- Ural Federal University, Lenin av. 51, 620000, Ekaterinburg, Russia
| | - Pedro A Sánchez
- Ural Federal University, Lenin av. 51, 620000, Ekaterinburg, Russia
| | - Sofia Kantorovich
- Ural Federal University, Lenin av. 51, 620000, Ekaterinburg, Russia and Faculty of Physics, Universität Wien, Boltzmanngasse 5, 1090 Wien, Austria
| | - Tomàs Sintes
- Instituto de Física Interdisciplinar y Sistemas Complejos, IFISC (CSIC-UIB), Universitat de les Illes Balears, E-07122 Palma de Mallorca, Spain
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Dempster JM, Vázquez-Montejo P, Olvera de la Cruz M. Contractile actuation and dynamical gel assembly of paramagnetic filaments in fast precessing fields. Phys Rev E 2017; 95:052606. [PMID: 28618507 DOI: 10.1103/physreve.95.052606] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2016] [Indexed: 05/22/2023]
Abstract
Flexible superparamagnetic filaments are studied under the influence of fast precessing magnetic fields using simulations and a continuum approximation analysis. We find that individual filaments can be made to exert controllable tensile forces along the precession axis. These forces are exploited for microscopic actuation. In bulk, the filaments can be rapidly assembled into different configurations whose material properties depend on the field parameters. The precession frequency affects filament aggregation and conformation by changing the net torques on the filament ends. Using a time-dependent precession angle allows considerable freedom in choosing properties for filament aggregates. As an example, we design a field that twists chains together to dynamically assemble a self-healing gel.
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Affiliation(s)
- Joshua M Dempster
- Northwestern University Department of Physics and Astronomy, 2145 Sheridan Road F165, Evanston, Illinois 60208, USA
| | - Pablo Vázquez-Montejo
- Northwestern University Department of Materials Science and Engineering, 2220 Campus Drive, Cook Hall 20136, Evanston, Illinois 60208, USA
| | - Monica Olvera de la Cruz
- Northwestern University Department of Physics and Astronomy, 2145 Sheridan Road F165, Evanston, Illinois 60208, USA
- Northwestern University Department of Materials Science and Engineering, 2220 Campus Drive, Cook Hall 20136, Evanston, Illinois 60208, USA
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