Galder Cristobal

X-ray microfocussing combined with microfluidics for on-chip X-ray scattering measurements

This work describes the fabrication of thin microfluidic devices in Kapton (polyimide). These chips are well-suited to perform X-ray scattering experiments using intense microfocussed beams, as Kapton is both relatively resistant to the high intensities generated by a synchrotron, and almost transparent to X-rays. We show networks of microchannels obtained using laser ablation of Kapton films, and we also present a simple way to perform fusion bonding between two Kapton films. The possibilities offered using such devices are illustrated with X-ray scattering experiments. These experiments demonstrate that structural measurements in the 1 A-20 nm range can be obtained with spatial resolutions of a few microns in a microchannel.

Un rheometre sur puce microfluidique

Nous avons mis au point un rheometre sur une puce microfluidique. Ce dispositif est base sur l’etude des ecoulements paralleles. Les valeurs mesurees pour des fluides newtoniens et non newtoniens sont en bon accord avec les mesures obtenues grâce a un rheometre classique. Ce dispositif permettra une approche haut debit des problemes de formulations.