Towards a programmable microfluidic valve: Formation dynamics of two-dimensional magnetic bead arrays in transient magnetic fields

Wittbracht F, Eickenberg B, Weddemann A, Hütten A (2011)
Journal of Applied Physics 109(11): 114503.

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Zeitschriftenaufsatz | Veröffentlicht | Englisch
Abstract / Bemerkung
The induction of dipolar coupling has proven to allow for the initiation of self-assembled, reconfigurable particle clusters of superparamagnetic microbeads suspended in a carrier liquid. The adjustment of the interplay between magnetic and hydrodynamic forces opens various possibilities for guiding strategies of these superstructures within microfluidic devices. In this work, the formation dynamics of such particle clusters under the influence of a rotating magnetic field are studied. Different agglomeration regimes are characterized by the dimensionality of the confined objects. The growth dynamics of the obtained agglomerates are analyzed quantitatively in order to deduce the microscopic growth mechanisms. The growth of two-dimensional clusters is governed by the addition of bead chains to previously formed agglomerates. Time scales for the cluster growth are characterized by the chain dissociation rate. Based on the experimental findings, we may conclude to a linear dependence of the chain dissociation rate on the rotation frequency of the applied magnetic field. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3582133]
Erscheinungsjahr
Zeitschriftentitel
Journal of Applied Physics
Band
109
Zeitschriftennummer
11
Seite
114503
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Wittbracht F, Eickenberg B, Weddemann A, Hütten A. Towards a programmable microfluidic valve: Formation dynamics of two-dimensional magnetic bead arrays in transient magnetic fields. Journal of Applied Physics. 2011;109(11):114503.
Wittbracht, F., Eickenberg, B., Weddemann, A., & Hütten, A. (2011). Towards a programmable microfluidic valve: Formation dynamics of two-dimensional magnetic bead arrays in transient magnetic fields. Journal of Applied Physics, 109(11), 114503. doi:10.1063/1.3582133
Wittbracht, F., Eickenberg, B., Weddemann, A., and Hütten, A. (2011). Towards a programmable microfluidic valve: Formation dynamics of two-dimensional magnetic bead arrays in transient magnetic fields. Journal of Applied Physics 109, 114503.
Wittbracht, F., et al., 2011. Towards a programmable microfluidic valve: Formation dynamics of two-dimensional magnetic bead arrays in transient magnetic fields. Journal of Applied Physics, 109(11), p 114503.
F. Wittbracht, et al., “Towards a programmable microfluidic valve: Formation dynamics of two-dimensional magnetic bead arrays in transient magnetic fields”, Journal of Applied Physics, vol. 109, 2011, pp. 114503.
Wittbracht, F., Eickenberg, B., Weddemann, A., Hütten, A.: Towards a programmable microfluidic valve: Formation dynamics of two-dimensional magnetic bead arrays in transient magnetic fields. Journal of Applied Physics. 109, 114503 (2011).
Wittbracht, Frank, Eickenberg, B., Weddemann, Alexander, and Hütten, Andreas. “Towards a programmable microfluidic valve: Formation dynamics of two-dimensional magnetic bead arrays in transient magnetic fields”. Journal of Applied Physics 109.11 (2011): 114503.