Acceleration of absolute negative mobility

Regtmeier J, Grauwin S, Eichhorn R, Reimann P, Anselmetti D, Ros A (2007)
JOURNAL OF SEPARATION SCIENCE 30(10): 1461-1467.

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Abstract
Recently, the counter intuitive migration phenomenon of absolute negative mobility (ANM) has been demonstrated to occur for colloidal particles in a suitably arranged post array within a microfluidic device [1]. This effect is based on the interplay of Brownian motion, nonlinear dynamics induced through microstructuring, and nonequilibrium driving, and results in a particle movement opposite to an applied static force. Simultaneously, the migration of a different particle species along the direction of the static force is possible [19], thus providing a new tool for particle sorting in microfluidic device format. The so far demonstrated maximum velocities for micrometer-sized spheres are slow, i.e., in the order of 10 nm per second. Here, we investigate numerically, how maximum ANM velocities can be significantly accelerated by a careful adjustment of the post size and shape. Based on this numerical analysis, a post design is developed and tested in a microfluidic device made of PDMS. The experiment reveals an order of magnitude increase in velocity.
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Regtmeier J, Grauwin S, Eichhorn R, Reimann P, Anselmetti D, Ros A. Acceleration of absolute negative mobility. JOURNAL OF SEPARATION SCIENCE. 2007;30(10):1461-1467.
Regtmeier, J., Grauwin, S., Eichhorn, R., Reimann, P., Anselmetti, D., & Ros, A. (2007). Acceleration of absolute negative mobility. JOURNAL OF SEPARATION SCIENCE, 30(10), 1461-1467.
Regtmeier, J., Grauwin, S., Eichhorn, R., Reimann, P., Anselmetti, D., and Ros, A. (2007). Acceleration of absolute negative mobility. JOURNAL OF SEPARATION SCIENCE 30, 1461-1467.
Regtmeier, J., et al., 2007. Acceleration of absolute negative mobility. JOURNAL OF SEPARATION SCIENCE, 30(10), p 1461-1467.
J. Regtmeier, et al., “Acceleration of absolute negative mobility”, JOURNAL OF SEPARATION SCIENCE, vol. 30, 2007, pp. 1461-1467.
Regtmeier, J., Grauwin, S., Eichhorn, R., Reimann, P., Anselmetti, D., Ros, A.: Acceleration of absolute negative mobility. JOURNAL OF SEPARATION SCIENCE. 30, 1461-1467 (2007).
Regtmeier, Jan, Grauwin, Sebastian, Eichhorn, Ralf, Reimann, Peter, Anselmetti, Dario, and Ros, Alexandra. “Acceleration of absolute negative mobility”. JOURNAL OF SEPARATION SCIENCE 30.10 (2007): 1461-1467.
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