In situ assembly of linked geometrically coupled microdevices

T. Sawetzki, S. Rahmouni, C. Bechinger, and D. W. M. Marr
PNAS December 23, 2008 105 (51) 20141-20145; https://doi.org/10.1073/pnas.0808808105

  1. Edited by Anthony Leggett, University of Illinois at Urbana–Champaign, Urbana, IL, and approved November 1, 2008 (received for review September 4, 2008)

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Article Figures & SI

Figures

  • Fig. 1.
    Fig. 1.

    Check valve position as a function of applied flow. Inset shows colloidal assembly composed of 4.5-μm particles, when the field is turned off. Note that 1.5-μm particles are used here as flow tracers.

  • Fig. 2.
    Fig. 2.

    Measured lateral concentration profiles of 0.76-μm tracer particles at positions down the channel fit to Eq. 1 (photo upper right). The applied field case (photo lower left) with good mixing and an assembly rotation rate of ≈10 Hz. Channel width at measurement start is 100 μm (horizontal lines).

  • Fig. 3.
    Fig. 3.

    A square translates along a series of inverted catenaries, the particle clusters along a series of inverted cycloids (28).

  • Fig. 4.
    Fig. 4.

    Coupled devices can be used to create more complex systems. (A) Pumping performed by a colloidal assembly piston using 4.5-μm particles as building blocks. (B) Pumped volume V (as measured in the boxed region) in channels with open (Vo, red) and closed (Vc, black) valves as a function of the pinion rotation frequency f. Measured check valve efficiency, independent of the rotation frequency f, is shown in the Inset.

  • Fig. 5.
    Fig. 5.

    A rotating magnetic field generated externally to the microfluidic device leads to attraction between individual particles in the sample plane and exerts a net torque on particle clusters once assembled.

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In situ assembly of linked geometrically coupled microdevices
T. Sawetzki, S. Rahmouni, C. Bechinger, D. W. M. Marr
Proceedings of the National Academy of Sciences Dec 2008, 105 (51) 20141-20145; DOI: 10.1073/pnas.0808808105
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