Anisotropy of colloidal components propels field-activated stirrers and movers

Steinbach, Gabi; Schreiber, Michael; Nissen, Dennis; Albrecht, Manfred; Gemming, Sibylle; Erbe, Artur

doi:10.1103/physrevresearch.2.023092

Cited by 8 publications

(1 citation statement)

References 55 publications

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“…Thus, in viscous fluids any type of reciprocal motion, such as a periodic back and forward motion similar to a scallop shell opening, would lead to no net translation . However, one could break this time reversibility in different ways, , for instance by designing micropropellers that can be actuated by external fields − or that can catalyze a chemical reaction on part of their surface. , In the former case, rotating magnetic particles − or rods − close to a solid surface act as microscopic bicycle wheels and can effectively break the time reversibility. The close substrate induces the hydrodynamic coupling between the rotational and translational movements, generating a net transport .…”

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confidence: 99%

Unveiling the Rolling to Kayak Transition in Propelling Nanorods with Cargo Trapping and Pumping

et al. 2023

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Magnetic nanorods driven by rotating fields in water can be rapidly steered along any direction while generating strong and localized hydrodynamic flow fields. Here we show that, when raising the frequency of the rotating field, these nanopropellers undergo a dynamic transition from a rolling to a kayak-like motion due to the increase in viscous drag and acquire a finite inclination angle with respect to the plane perpendicular to the bottom surface. We explain these experimental observations with a theoretical model which considers the nanorod as a pair of ferromagnetic particles hydrodynamically interacting with a close stationary surface. Further, we quantify how efficiently microscopic cargoes can be trapped or expelled from the moving nanorod and use numerical simulations to unveil the generated hydrodynamic flow field. These propulsion regimes can be implemented in microfluidic devices to perform precise operations based on the selective sorting of microscopic cargoes.

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confidence: 99%

Unveiling the Rolling to Kayak Transition in Propelling Nanorods with Cargo Trapping and Pumping

et al. 2023

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A guide to design the trajectory of active particles: From fundamentals to applications

Harraq

Bello

Bharti

2022

Current Opinion in Colloid & Interface Science

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Translatory and rotatory motion of exchange-bias capped Janus particles controlled by dynamic magnetic field landscapes

Huhnstock

Reginka

Tomita

et al. 2021

Sci Rep

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Magnetic Janus particles (MJPs), fabricated by covering a non-magnetic spherical particle with a hemispherical magnetic in-plane exchange-bias layer system cap, display an onion magnetization state for comparably large diameters of a few microns. In this work, the motion characteristics of these MJPs will be investigated when they are steered by a magnetic field landscape over prototypical parallel-stripe domains, dynamically varied by superposed external magnetic field pulse sequences, in an aqueous medium. We demonstrate, that due to the engineered magnetization state in the hemispherical cap, a comparably fast, directed particle transport and particle rotation can be induced. Additionally, by modifying the frequency of the applied pulse sequence and the strengths of the individual field components, we observe a possible separation between a combined or an individual occurrence of these two types of motion. Our findings bear importance for lab-on-a-chip systems, where particle immobilization on a surface via analyte bridges shall be used for low concentration analyte detection and a particle rotation over a defined position of a substrate may dramatically increase the immobilization (and therefore analyte detection) probability.

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Anisotropy of colloidal components propels field-activated stirrers and movers

Cited by 8 publications

References 55 publications

Unveiling the Rolling to Kayak Transition in Propelling Nanorods with Cargo Trapping and Pumping

Unveiling the Rolling to Kayak Transition in Propelling Nanorods with Cargo Trapping and Pumping

A guide to design the trajectory of active particles: From fundamentals to applications

Translatory and rotatory motion of exchange-bias capped Janus particles controlled by dynamic magnetic field landscapes

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