Assembly of Superparamagnetic Filaments in External Field

Wei, Jiachen; Song, Fan; Dobnikar, Jure

doi:10.1021/acs.langmuir.6b02268

Cited by 21 publications

(17 citation statements)

References 41 publications

(62 reference statements)

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“…This kind of filaments exhibit diverse morphological features [9], for instance, depending on their length, bending rigidity and magnetic field strength, they may adopt U and S shapes [4,10] or configurations with more undulations [11]. Configurations of anchored superparamagnetic filaments with a free end may fold into loops, sheets and pillars for different combinations of their bending rigidity and the strength of the magnetic field [12]. In a precessing magnetic field, filaments with loads at their ends can adopt planar or helical configurations by changing the precessing angle and with a time-dependent precession free filaments can assemble into gels of diverse conformations [13].…”

Section: Introductionmentioning

confidence: 99%

Paramagnetic filaments in a fast precessing field: Planar versus helical conformations

Vázquez-Montejo¹,

Dempster²,

Cruz³

2017

Phys. Rev. Materials

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We examine analytically equilibrium conformations of elastic chains of paramagnetic beads in the presence of a precessing magnetic field. Conformations of these filaments are determined by minimizing their total energy, given in the harmonic approximation by the sum of the bending energy, quadratic in its curvature, and the magnetic dipolar interaction energy, quadratic in the projection of the vector tangent to the filament onto the precession axis. In particular, we analyze two families of open filaments with their ends aligned along the precession axis and described by segments of planar curves and helices. These configurations are characterized in terms of two parameters encoding their features such as their length, separation between their ends, as well as their bending and magnetic moduli, the latter being proportional to the magnitude and precession angle of the magnetic field. Based on energetic arguments, we present the set of parameter values for which each of these families of curves is probable to occur.

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Section: Introductionmentioning

confidence: 99%

Paramagnetic filaments in a fast precessing field: Planar versus helical conformations

Vázquez-Montejo¹,

Dempster²,

Cruz³

2017

Phys. Rev. Materials

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“…Modern experimental techniques allow the stabilisation of dipolar clusters by polymer crosslinking, forming supracolloidal magnetic polymer-like structures [14][15][16][17]. In general, the behaviour of chain-like magnetic SMPs has been actively investigated in experiment [18][19][20][21], theory [22][23][24] and coarse-grained computer simulations [25][26][27][28]. All these works agree that SMPs represent a promise for potential medical and microfluidics application [29,30].…”

Section: Introductionmentioning

confidence: 96%

The structure of clusters formed by Stockmayer supracolloidal magnetic polymers

et al. 2019

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Unlike Stockmayer fluids, that prove to undergo gas-liquid transition on cooling, the system of dipolar hard or soft spheres without any additional central attraction so far has not been shown to have a critical point. Instead, in the latter, one observes diverse self-assembly scenarios. Crosslinking dipolar soft spheres into supracolloidal magnetic polymer-like structures (SMPs) changes the self-assembly behaviour. Moreover, aggregation in systems of SMPs strongly depends on the constituent topology. For Y-and X-shaped SMPs, under the same conditions in which dipolar hard spheres would form chains, the formation of very large loose gel-like clusters was observed [Journal of Molecular Liquids, 271, 631 (2018)]. In this work, using molecular dynamics simulations, we investigate self-assembly in suspensions of four topologically different SMPs -chains, rings, X and Y -monomers in which interact via Stockmayer potential. As expected, compact drop-like clusters are formed by SMPs in all cases if the central isotropic attraction is introduced, however, their shape and internal structure turn out to depend on the SMPs topology. arXiv:1912.01314v1 [cond-mat.soft]

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“…Magnetic filaments have been actively studied theoretically in recent years [11,12,13]. Special attention has been payed to their rheology [14,15] and magnetic response [16,17].…”

Section: Introductionmentioning

confidence: 99%

Magnetic properties of clusters of supracolloidal magnetic polymers with central attraction

Novak

Zverev

Pyanzina

et al. 2020

Journal of Magnetism and Magnetic Materials

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A B S T R A C T Supracolloidal magnetic polymers (SMPs) are structures made by crosslinking magnetic particles. In this work, using Langevin dynamics simulations, we study the zero-field magnetic properties of clusters formed in suspensions of SMPs with different topologies -chains, rings, X and Y -that interact via Stockmayer potential. We find that the presence of central attraction, resulting in the formation of large compact clusters, leads to a dramatic decrease of the suspension initial susceptibility, independently from SMP topology. However, the largest decrease corresponds to chain-like SMPs with strongly interacting particles. This is due to the higher rotational degrees of freedom of SMPs with such topology, which allows the particles to reorganise themselves inside the clusters in such a way that their magnetic moments form energetically advantageous vortex structures with negligible net magnetic moments.

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Assembly of Superparamagnetic Filaments in External Field

Cited by 21 publications

References 41 publications

Paramagnetic filaments in a fast precessing field: Planar versus helical conformations

Paramagnetic filaments in a fast precessing field: Planar versus helical conformations

The structure of clusters formed by Stockmayer supracolloidal magnetic polymers

Magnetic properties of clusters of supracolloidal magnetic polymers with central attraction

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