Shear-affected depletion interaction

July, Christoph; Kleshchanok, Dzina; Láng, P.

doi:10.1140/epje/i2012-12060-7

Cited by 4 publications

(2 citation statements)

References 38 publications

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“…Sphere/wall and sphere/sphere interactions in a dilute suspension of infinitely thin rods were numerically calculated [13]. Shear-affected depletion interactions with disc-shaped particles were experimentally studied [14]. A detailed review on depletion surface forces can be found in the book by Lekkerkerker and Tuinier [15].…”

Section: Introductionmentioning

confidence: 99%

Depletion forces in thin liquid films due to nonionic and ionic surfactant micelles

Kralchevsky

Danov

Anachkov

2015

Current Opinion in Colloid & Interface Science

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Section: Introductionmentioning

confidence: 99%

Depletion forces in thin liquid films due to nonionic and ionic surfactant micelles

Kralchevsky

Danov

Anachkov

2015

Current Opinion in Colloid & Interface Science

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“…Theories have also addressed the case of active colloids immersed in a bath of passive depletants [ 65 ], nanobubbles [ 66 ], nanoparticles [ 67 , 68 , 69 , 70 , 71 ], microgels [ 72 ], and bacterial systems [ 73 ]. One should also mention the theoretical efforts intended to characterize the depletion phenomena in confined domains [ 74 , 75 ], as well as near dielectric discontinuities [ 76 ] and in shear conditions [ 77 ]. For a review of the research about the topic in both bulk and confined domains see for instance Trokhymchuk et al [ 74 ].…”

Section: Introductionmentioning

confidence: 99%

Depletion Interactions at Interfaces Induced by Ferromagnetic Colloidal Polymers

Cerdà,

Batle,

Bona-Casas

et al. 2024

Polymers

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The pair-interaction force profiles for two non-magnetic colloids immersed in a suspension of ferromagnetic colloidal polymers are investigated via Langevin simulations. A quasi-two-dimensional approach is taken to study the interface case and a range of colloidal size ratios (non-magnetic:magnetic) from 6:1 up to 20:1 have been considered in this work. Simulations show that when compared with non-magnetic suspensions, the magnetic polymers strongly modify the depletion force profiles leading to strongly oscillatory behavior. Larger polymer densities and size ratios increase the range of the depletion forces, and in general, also their strength; the force barrier peaks at short distances show more complex behavior. As the length of the ferromagnetic polymers increases, the force profiles become more regular, and stable points with their corresponding attraction basins develop. The number of stable points and the distance at which they occur can be tuned through the modification of the field strength H and the angle θ formed by the field and the imaginary axis joining the centers of the two non-magnetic colloids. When not constrained, the net forces acting on the two colloids tend to align them with the field till θ=0∘. At this angle, the force profiles turn out to be purely attractive, and therefore, these systems could be used as a funneling tool to form long linear arrays of non-magnetic particles. Torsional forces peak at θ=45∘ and have minimums at θ=0∘ as well as θ=90∘ which is an unstable orientation as slight deviations will evolve towards θ→0∘. Nonetheless, results suggest that the θ=90∘ orientation could be easily stabilized in several ways. In such a case, the stable points that the radial force profiles exhibit for this orthogonal orientation to the field could be used to control the distance between the two large colloids: their position and number can be controlled via H. Therefore, suspensions made of ferromagnetic colloidal polymers can be also useful in the creation of magnetic colloidal tweezers or ratchets. A qualitative explanation of all the observed phenomena can be provided in terms of how the geometrical constraints and the external field modify the conformations of the ferromagnetic polymers near the two large particles, and in turn, how both factors combine to create unbalanced Kelvin forces that oscillate in strength with the distance between the two non-magnetic colloids.

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Nonequilibrium depletion interactions in active microrheology

2017

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Entropic depletion forces arise between mesoscopic bodies that are immersed in a suspension of macromolecules, such as colloid-polymer mixtures. Here we consider the case of a driven colloidal probe in the presence of another, passive colloidal particle, both solvated in an ideal bath of small spherical particles. We calculate the nonequilibrium forces mediated by the depletants on the two colloidal particles within a dynamical superposition approximation (DSA) scheme. In order to assess the quality of this approximation, and to obtain the colloidal microstructure around the driven probe, we corroborate our theoretical results with Brownian dynamics simulations.

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Shear-affected depletion interaction

Cited by 4 publications

References 38 publications

Depletion forces in thin liquid films due to nonionic and ionic surfactant micelles

Depletion forces in thin liquid films due to nonionic and ionic surfactant micelles

Depletion Interactions at Interfaces Induced by Ferromagnetic Colloidal Polymers

Nonequilibrium depletion interactions in active microrheology

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