Versatile Microfluidics : on microfocus SAXS, perpendicular colloid alignment and liquid jets
Lundi 11 février 2013 14:00
- Duree : 1 heure
Lieu : Laboratoire Interdisciplinaire de Physique (ex LSP), Salle 216, Bât. E - 140 Avenue de la Physique Domaine Universitaire - Saint-Martin-d’Hères
Orateur : Martin TREBBIN (Bayreuth University, Germany)
Microfluidic devices handle liquid volumes down to picoliters and this precise control enables the investigation of shear alignment of nano- to microscale particles under very defined conditions. The combination of small-angle X-ray scattering (SAXS) and microfluidics is currently being developed into a powerful experimental methodology suitable for detailed in-situ investigations for the correlation of complex fluid’s non-linear behavior with structural information. [1,2] Our experiments in microfluidic devices revealed the striking effect, that after passing a narrow section, wormlike particles are rotated perpendicular to the flow direction, keeping this orientation over the remaining length of the channel. The flow-alignment of cylindrical, wormlike or fibrous structures is central to many processing steps such as in the production of high-performance fibers, during injection molding or the flow of cells and proteins through thin capillaries.
[1] M. Trebbin, D. Steinhauser, J. Perlich, A. Buffet, Stephan V. Roth, W. Zimmermann, J. Thiele, S. Förster, PNAS 2013, in revision.
[2] M. Trebbin, K. Krüger, D. DePonte, S.V. Roth, J. Schulz, H. Chapman, S. Förster, 2013, in preparation.
Contact : sigolene.lecuyer@ujf-grenoble.fr
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