Small asymmetric Brownian objects self-align in nanofluidic channels

Fiorucci, Giulia; Padding, JT Johan; Dijkstra, Marjolein

doi:10.1039/c8sm02384k

Cited by 2 publications

(2 citation statements)

References 44 publications

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“…All three modes of motion, namely, rotation and streamwise and cross-streamwise translation, are also present when an asymmetric disk dimer is far away from any side walls as demonstrated by Uspal, Eral, and Doyle ( 22 ). Evidently, screened hydrodynamic interactions give rise to nontrivial behavior not only in particle ensembles ( 40 – 44 ), but also in single-particle systems with broken symmetry ( 45 – 51 ). A first step toward the development of low-cost flow separators requires understanding the relation between the geometry of one such particle and its trajectory in confined Stokes flow.…”

mentioning

confidence: 99%

Universal motion of mirror-symmetric microparticles in confined Stokes flow

Georgiev

Toscano

Uspal

et al. 2020

Proc. Natl. Acad. Sci. U.S.A.

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Comprehensive understanding of particle motion in microfluidic devices is essential to unlock additional technologies for shape-based separation and sorting of microparticles like microplastics, cells, and crystal polymorphs. Such particles interact hydrodynamically with confining surfaces, thus altering their trajectories. These hydrodynamic interactions are shape dependent and can be tuned to guide a particle along a specific path. We produce strongly confined particles with various shapes in a shallow microfluidic channel via stop flow lithography. Regardless of their exact shape, particles with a single mirror plane have identical modes of motion: in-plane rotation and cross-stream translation along a bell-shaped path. Each mode has a characteristic time, determined by particle geometry. Furthermore, each particle trajectory can be scaled by its respective characteristic times onto two master curves. We propose minimalistic relations linking these timescales to particle shape. Together these master curves yield a trajectory universal to particles with a single mirror plane.

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mentioning

confidence: 99%

Universal motion of mirror-symmetric microparticles in confined Stokes flow

Georgiev

Toscano

Uspal

et al. 2020

Proc. Natl. Acad. Sci. U.S.A.

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show abstract

“…All three modes of motion, namely, rotation, streamwise and cross-streamwise translation, are also present when an asymmetric disk dimer is far away from any side walls as demonstrated by Uspal, Eral & Doyle [22]. Evidently, screened hydrodynamic interactions give rise to non-trivial behaviour not only in particle ensembles [40][41][42][43][44], but also in single-particle systems with broken symmetry [45][46][47][48][49][50][51]. A first step towards the development of low-cost flow separators requires understanding the relation between the geometry of one such particle and its trajectory in confined Stokes flow.…”

mentioning

confidence: 92%

Universal motion of mirror-symmetric microparticles in confined Stokes flow

Georgiev,

Toscano,

Uspal

et al. 2020

Preprint

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Comprehensive understanding of particle motion in microfluidic devices is essential to unlock novel technologies for shape-based separation and sorting of microparticles like microplastics, cells and crystal polymorphs. Such particles interact hydrodynamically with confining surfaces, thus altering their trajectories. These hydrodynamic interactions are shape-dependent and can be tuned to guide a particle along a specific path. We produce strongly confined particles with various shapes in a shallow microfluidic channel via stop flow lithography. Regardless of their exact shape, particles with a single mirror plane have identical modes of motion: in-plane rotation and cross-stream translation along a bell-shaped path. Each mode has a characteristic time, determined by particle geometry. Furthermore, each particle trajectory can be scaled by its respective characteristic times onto two master curves. We propose minimalistic relations linking these timescales to particle shape. Together these master curves yield a trajectory universal to particles with a single mirror plane.

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Small asymmetric Brownian objects self-align in nanofluidic channels

Abstract: Small Brownian particles, asymmetric in shape, display self-alignment in Hele-Shaw flow in nanofluidic channels.

Cited by 2 publications

References 44 publications

Universal motion of mirror-symmetric microparticles in confined Stokes flow

Universal motion of mirror-symmetric microparticles in confined Stokes flow

Universal motion of mirror-symmetric microparticles in confined Stokes flow

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