Effective colloidal interactions in rotating magnetic fields

Coughlan, Anna C. H.; Bevan, Michael A.

doi:10.1063/1.4986501

Cited by 14 publications

(4 citation statements)

References 48 publications

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“…[1][2][3] Two-dimensional (2D) colloidal crystals self-assembled in external fields can act as seeds for 3D structures used in photonics [4][5][6][7][8] as well as for porous media and membranes used for photocatalysis, electrochemical energy storage and conversion, and chemical applications. [9][10][11][12][13] Although tunable interactions can be achieved in different ways (including optical, chemical, and flow-mediated mechanisms 2 ), the use of electric [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29] and magnetic 16,[30][31][32][33][34][35][36][37][38][39][40][41] fields is among the most promising due to their technological flexibility, the long-range character of the obtained interactions, and the ability to change them in situ.…”

Section: Introductionmentioning

confidence: 99%

Phase diagram of two-dimensional colloids with Yukawa repulsion and dipolar attraction

Kryuchkov

Smallenburg

Ivlev

et al. 2019

The Journal of Chemical Physics

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We study the phase diagram of a two-dimensional (2D) system of colloidal particles, interacting via an isotropic potential with a short-ranged Yukawa repulsion and a long-ranged dipolar attraction. Such interactions in 2D colloidal suspensions can be induced by rapidly rotating in-plane magnetic (or electric) fields. Using computer simulations and liquid integral equation theory, we calculate the bulk phase diagram, which contains gas, crystalline, liquid, and supercritical fluid phases. The densities at the critical and triple points in the phase diagram are governed by the softness of Yukawa repulsion and can therefore be largely tuned. We observe that the liquid-gas binodals exhibit universal behavior when the effective temperature (given by the inverse magnitude of the dipolar attractions) is normalized by its value at the critical point and the density is normalized by the squared Barker-Henderson diameter. The results can be verified in particle-resolved experiments with colloidal suspensions.

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Section: Introductionmentioning

confidence: 99%

Phase diagram of two-dimensional colloids with Yukawa repulsion and dipolar attraction

Kryuchkov

Smallenburg

Ivlev

et al. 2019

The Journal of Chemical Physics

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“…The easy magnetization direction in terms of magneto-crystalline anisotropy is perpendicular to that of shape anisotropy. Many materials possess a large uniaxial magneto-crystalline constant that dominates over the shape anisotropy effect, making their easy magnetization direction perpendicular to the basal plane (i.e., Co , in Figure C and D and Hexaferrites − ).…”

Section: Anisotropic Magnetic Nanoparticlesmentioning

confidence: 99%

Magnetically Induced Anisotropic Interaction in Colloidal Assembly

Fan

et al. 2023

Precision Chemistry

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The wide accessibility to nanostructures with high uniformity and controllable sizes and morphologies provides great opportunities for creating complex superstructures with unique functionalities. Employing anisotropic nanostructures as the building blocks significantly enriches the superstructural phases, while their orientational control for obtaining long-range orders has remained a significant challenge. One solution is to introduce magnetic components into the anisotropic nanostructures to enable precise control of their orientations and positions in the superstructures by manipulating magnetic interactions. Recognizing the importance of magnetic anisotropy in colloidal assembly, we provide here an overview of magnetic field-guided self-assembly of magnetic nanoparticles with typical anisotropic shapes, including rods, cubes, plates, and peanuts. The Review starts with discussing the magnetic energy of nanoparticles, appreciating the vital roles of magneto-crystalline and shape anisotropies in determining the easy magnetization direction of the anisotropic nanostructures. It then introduces superstructures assembled from various magnetic building blocks and summarizes their unique properties and intriguing applications. It concludes with a discussion of remaining challenges and an outlook of future research opportunities that the magnetic assembly strategy may offer for colloidal assembly.

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“…relating the probability distribution of a physical quantity to an effective energy landscape [47]. As shown in Fig.…”

Section: Cell-cargo Distance Displays Recurrent Dynamicsmentioning

confidence: 99%

Biohybrid active matter -- the emergent properties of cell-mediated microtransport

Lepro¹,

Großmann²,

Nagel³

et al. 2021

Preprint

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As society paves its way towards device miniaturization and precision medicine, micro-scale actuation and guided transport become increasingly prominent research fields with high impact in both technological and clinical contexts. In order to accomplish directed motion of micron-sized objects towards specific target sites, active biohybrid transport systems, such as motile living cells that act as smart biochemically-powered micro-carriers, have been suggested as an alternative to synthetic micro-robots. Inspired by the motility of leukocytes, we propose the amoeboid crawling of eukaryotic cells as a promising mechanism for transport of micron-sized cargoes and present an in-depth study of this novel type of composite active matter. Its transport properties result from the interactions of an active element (cell) and a passive one (cargo) and reveal an optimal cargo size that enhances the locomotion of the load-carrying cells, even exceeding their motility in the absence of cargo. The experimental findings are rationalized in terms of a biohybrid active matter theory that explains the emergent cell-cargo dynamics and enables us to derive the long-time transport properties of amoeboid micro-carries. As amoeboid locomotion is commonly observed for mammalian cells such as leukocytes, our results lay the foundations for the study of transport performance of other medically relevant cell types and for extending our findings to more advanced transport tasks in complex environments, such as tissues.

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Effective colloidal interactions in rotating magnetic fields

Cited by 14 publications

References 48 publications

Phase diagram of two-dimensional colloids with Yukawa repulsion and dipolar attraction

Phase diagram of two-dimensional colloids with Yukawa repulsion and dipolar attraction

Magnetically Induced Anisotropic Interaction in Colloidal Assembly

Biohybrid active matter -- the emergent properties of cell-mediated microtransport

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