Bidirectional particle transport and size selective sorting of Brownian particles in a flashing spatially periodic energy landscape

Martínez‐Pedrero, Fernando; Massana-Cid, Helena; Ziegler, Till; Johansen, T. H.; Straube, Arthur V.; Tierno, Pietro

doi:10.1039/c6cp05599k

Cited by 15 publications

(14 citation statements)

References 34 publications

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“…[13][14][15] The behaviours of many other molecules have also been investigated in terms of their ability to walk or rotate preferentially in a particular direction either driven by a laser pulse, 16 chemical reactions, [17][18][19][20] electric eld, [21][22][23][24] temperature, 25 or a combination of different stimuli. 26 A ratchet-like behaviour has been observed in colloidal particles, 27 an articial motor system designed to replicate a realistic motor protein, 28 cold atoms in optical lattices, [29][30][31] nanoparticles in solution, 32,33 SQUIDs, 34 soliton transport, 35 nanopores in polymer lms, 36 polarons in diatomic molecular chains, 37 superparamagnetic particles, 38 and many other cases.…”

Section: Introductionmentioning

confidence: 99%

Controlling the preferential motion of chiral molecular walkers on a surface

et al. 2019

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Section: Introductionmentioning

confidence: 99%

Controlling the preferential motion of chiral molecular walkers on a surface

et al. 2019

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“…On the colloidal scale, studies of time-dependent potential energy landscapes have exhibited rich dynamics such as accelerated motion with low dispersion [35,36] and a reduction in static friction [37] due to mode locking. Conversely, time-dependence can also cause enhanced diffusion [26,27,38] and, under the correct conditions, can lead to bidirectional particle transport [39]. Experiments carried out for large systems subject to a time-dependent optical potential energy landscape show that collective effects, such as kinks, can affect the dynamics [37].…”

Section: Introductionmentioning

confidence: 99%

Transport of a colloidal particle driven across a temporally oscillating optical potential energy landscape

et al. 2019

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A colloidal particle is driven across a temporally oscillating one-dimensional optical potential energy landscape and its particle motion is analysed. Different modes of dynamic mode locking are observed and are confirmed with the use of phase portraits. The effect of the oscillation frequency on the mode locked step width is addressed and the results are discussed in light of a high-frequency theory and compared to simulations. Furthermore, the influence of the coupling between the particle and the optical landscape on mode locking is probed by increasing the maximum depth of the optical landscape. Stronger coupling is seen to increase the width of mode locked steps. Finally, transport across the temporally oscillating landscape is studied by measuring the effective diffusion coefficient of a mobile particle, which is seen to be highly sensitive to the driving velocity and mode locking.

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“…Moreover, the linear motion of magnetic particles within magnetic tubes was shown. The sorting of microbeads populations in a fixed direction and along a magnetic track on a chip was demonstrated . In all the latter cases, the particle motion takes place along a predefined axis or direction.…”

Section: Introductionmentioning

confidence: 99%

A Trisymmetric Magnetic Microchip Surface for Free and Two‐Way Directional Movement of Magnetic Microbeads

Sajjad

Lage

McCord

2018

Adv Materials Inter

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it is dominated by the out-of-plane (z) stray component of the magnetic stray field gradient, denoted as dH stray,z /dz, occurring above the magnetised magnetic surface. By alteration of the external magnetic field strength and direction, the occurrence and the position of magnetic field gradients can be varied in a controlled way.Thus, using rotating magnetic fields, the manipulation and transportation of mere and labeled microbeads are realized along defined paths of discrete soft-magnetic patterns. [5][6][7][8][9][10] Similarly, patterned disk arrays are used for the movement of micro particles, [11][12][13][14][15] involving the applications of in-plane and out-of-plane magnetic field sequences. The precise positioning through predefined magnetic tracks [16][17][18][19][20][21] and 2D periodic structures [22] was realized. Moreover, the linear motion of magnetic particles within magnetic tubes [23] was shown. The sorting of microbeads populations in a fixed direction and along a magnetic track on a chip was demonstrated. [24][25][26] In all the latter cases, the particle motion takes place along a predefined axis or direction. A node structure or a switch is necessary in such structures. Limitations in efficiency of movement is another factor that affects the adaptability of magnetic chip based approaches. [27] Overall, using magnetically labeled superparamagnetic beads for selective and free or flexible lateral cell moving together with sorting has not been realized for microfluidic lab-on-chip applications.In this paper, we demonstrate a novel approach for the realization of free lateral and selective motion and, thus, sorting of different ensembles of microbeads by utilizing a broken symmetry in stray field gradients due to symmetrically and asymmetrically applied external magnetic fields. Temporally and spatially tuning of the stray field gradients at corners and along edges in periodically arranged soft-magnetic micromagnets facilitates the individual movement of dissimilar microbead populations. By applying square wave modulated externally applied magnetic field components, we realize the guided motion of microbeads along selectable microcorridors across arrays of magnetic elements. Choosing the proper external magnetic field parameters, we achieve bidirectional propulsion and separation, depending on the size of the microbeads. The areas with 2D periodic structures enable multidirectional and microbead selective transportation of mixed-sized microbead ensembles at a single bead level. The presented dynamical approach of selective bead motion and bead separation paves a new way for the development of alternative magnetic field configurable micromagnetic lab-on-chip devices.The guidance of labeled microcarriers in microfluidic environments is a prerequisite to the development of magnetic pattern assisted lab-on-chip technology. Square wave modulations of in-plane applied magnetic fields enable the forward and backward locomotion of superparamagnetic microspheres on discrete hexagonally arranged ferromagn...

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Bidirectional particle transport and size selective sorting of Brownian particles in a flashing spatially periodic energy landscape

Cited by 15 publications

References 34 publications

Controlling the preferential motion of chiral molecular walkers on a surface

Controlling the preferential motion of chiral molecular walkers on a surface

Transport of a colloidal particle driven across a temporally oscillating optical potential energy landscape

A Trisymmetric Magnetic Microchip Surface for Free and Two‐Way Directional Movement of Magnetic Microbeads

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