Ferrofluid with clustered iron nanoparticles: Slow relaxation of rheological properties under joint action of shear flow and magnetic field

Borin, Dmitry; Zubarev, A. Yu.; Chirikov, Dmitry; Müller, Robert N.; Odenbach, Stefan

doi:10.1016/j.jmmm.2010.11.020

Cited by 41 publications

(45 citation statements)

References 12 publications

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“…Our observations should be directly measurable in real systems of field-propelled metallodielectric particles [15]. Moreover, we expect our findings to be transferable to other driven colloidal systems with direction-dependent interactions, examples being "patchy" particles which display both equilibrium aggregation and condensation [32], or dipolar colloids under shear flow [33].…”

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confidence: 57%

Lane formation in a system of dipolar microswimmers

Kogler¹,

Klapp²

2015

EPL

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-Self-organization in statistical physics PACS 64.75.Xc -Phase separation and segregation in colloids Abstract -Using Brownian Dynamics (BD) simulations we investigate the non-equilibrium structure formation of a two-dimensional (2D) binary system of dipolar colloids propelling in opposite directions. Despite of a pronounced tendency for chain formation, the system displays a transition towards a laned state reminiscent of lane formation in systems with isotropic repulsive interactions. However, the anisotropic dipolar interactions induce novel features: First, the lanes have themselves a complex internal structure characterized by chains or clusters. Second, laning occurs only in a window of interaction strengths. We interprete our findings by a phase separation process and simple force balance arguments.Introduction. -Lane formation is a protoype of a non-equilibrium self-organization process, where an originally homogenous mixture of particles (or other types of "agents") moving in opposite directions segregates into macroscopic lanes composed of different species. This ubiquitous phenomenon occurs, e.g., in driven binary mixtures of colloidal particles [1-3] and migrating macroions [4], in binary plasmas [5,6], but also in "selfpropelling" systems with aligned velocities such as bacteria in channels [7] and humans in pedestrian zones [8]. In particular, studies of charged colloids have revealed many fundamental aspects of laning such as the impact of density [9], the role of hydrodyamics [10], the accompanying microscopic dynamics (particularly, the so-called dynamical locking) [2], and the impact of anisotropic friction [11].

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confidence: 57%

Lane formation in a system of dipolar microswimmers

Kogler¹,

Klapp²

2015

EPL

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“…As in [14][15][16][17][18], the energy of the directed dipoledipole interaction between adjacent particles in a chain is noticeably higher than kT. Note that this is the necessary condition for the formation of aggregates in a ferrofluid.…”

Section: Introductionmentioning

confidence: 76%

“…Here, in order to obtain physically reasonable estimates, we shall simulate a chain by an ellipsoid of revolution with major and minor axes nd and d, respectively. Note that the same model was used in [14][15][16][17][18] to determine the rheologi cal characteristics of a ferrofluid.…”

Section: Coefficients Of Chain Mobility Tensors β Nmentioning

confidence: 99%

“…Despite its simplicity, use of this model has resulted in the adequate description of the rheological properties of different magnetic fluids formed from both single domain and clustered parti cles [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

“…Within the framework of this model [14][15][16][17][18], parti cles are considered to be identical to ferromagnetic beads with diameter d and magnetic moment m frozen into the bulk particle. It is assumed that the particles can unite to form chains, which are considered spe cific heterofluctuations of density.…”

Section: Introductionmentioning

confidence: 99%

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Diffusion and magnetotransport in ferrofluids containing chain-shaped aggregates

Zubarev

2013

Colloid J

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Abstract-The effect of chain structures on particle diffusion in nanodisperse ferrofluids subjected to exter nal magnetic fields is studied. It is shown that the chain formation imparts very strong anisotropy to the dif fusion properties of ferrofluids: the diffusion coefficient along a field appears to be approximately two orders of magnitude higher than that in the transverse direction. The presence of the chains changes the particle magnetophoresis coefficient significantly.

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