During this post-doc financed by the ANR (ENCORE), we will study hydrophilic and hydrophobic surfaces, along with polymer decorated walls and combine our results with the dSFA and PE experiments. In the first part, we will address how polymer molecules in solution react at a boundary when subject to a pressure driven flow; do they stick or slip, and how much? The effect of the polymer concentration, chain length and degree of confinement by one or two walls will be investigated; a complete fundamental understanding of these dependencies is currently lacking.
Experiments will be conducted using the lately developed and high precision surface probe: total internal reflection fluorescence, near-wall nanovelocimetry (TIRF-NWN) that measures particle position thanks to an evanescent light wave. Further development of this technique using tagged polymers will be necessary, and the flow experiments will be conducted in microfluidic environments tailored to the nanoscale using infrastructure provided by the host institution, the Institut Pierre-Gilles de Gennes pour la Microfluidique.

Publié le 12/06/18