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)

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.

Data supplements

Back to top
Article Alerts
Email Article
Citation Tools
Request Permissions
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
del.icio.us logo Digg logo Reddit logo Twitter logo CiteULike logo Facebook logo Google logo Mendeley logo

You May Also be Interested in

PNAS QnAs with NAS member and chemist Shaul Mukamel
PNAS QnAs
PNAS QnAs with NAS member and chemist Shaul Mukamel.
Wolf spider. Image courtesy of Modman/Pixabay.
Warming and predator-prey interactions in Arctic tundra
Researchers report links between warming and predator-prey interactions in the Arctic and suggest that predator activity can influence carbon and nitrogen dynamics in the Arctic, but that warming may alter or reverse such effects.
Image courtesy of Modman/Pixabay.
Blood test.
Acetyl-L-carnitine deficiency and major depressive disorder
A study finds that individuals with major depressive disorder had lower blood levels of acetyl-L-carnitine (LAC) than healthy controls, suggesting that LAC might aid the diagnosis of severe, trauma-associated depression.
Image courtesy of PublicDomainPictures/Pixabay.
View of the Two Medicine River.
Humans, climate, and fire regimes
A study explores historical fire activity associated with bison hunting by indigenous groups in North America, and suggests that fire use by indigenous hunters might have amplified the effect of climate variability on fire activity in the North American Great Plains.
Proceedings of the National Academy of Sciences: 115 (33)
Current Issue

Submit

Jump to section