Anisotropic composite polymer for high magnetic force in microfluidic systems

International audienceAnisotropic carbonyl iron-PolyDiMethylSiloxane (PDMS) composites were developed and implemented in microfluidic devices to serve as magnetic flux concentrators. These original materials provide technological solutions for heterogeneous integration with PDMS. Besides microfabrication advantages, they offer interesting modular magnetic properties. Applying an external magnetic field during the PDMS reticulation leads to the formation of 1D-agglomerates of magnetic particles, organized in the non-magnetic polymer matrix. This induces an increase of susceptibility as compared to composites with randomly dispersed particles. In this report, we explored the gain in reachable magnetophoretic forces in operating microfluidic devices, from the study of magnetic micro-beads motion injected in the microchannel. We show that even at relatively large distances from the magnetically-functionalized channel wall, the anisotropic composite leads to a factor two increase in the magnetophoretic force. Finally, further investigations based on finite element description suggest that the measured benefit of anisotropic composite polymers does not only rely on the global susceptibility increase but also on the local magnetic field gradients originating from the microstructure

Conception participative et évaluation d'un serious game pour les enfants asthmatiques

International audienceThe study described in this paper highlighted the participatory design process (PD) in the context of asthma e-learning. First, we described global process to design this tool named KidBreath. Second, we evaluated in two Year 4 classes its efficacy in a motivation way, usability, disease knowledge and interests of children by their system. Results showed, in acceptance with behaviors, high level of intrinsic motivation when using KidBreath, usability and enjoyment of edutainment activities. This pilot study tends to confirm to continue with this approach with asthma kids at home.L'étude décrite dans cet article met en exergue l'intérêt d'une approche de conception participative (CP) dans le cadre d'un apprentissage en ligne sur l'asthme pour les enfants. Après avoir décrit l'ensemble de la démarche pour la conception de cet e-learning nommé KidBreath, nous évaluons dans 2 classes de CE2 son efficacité au niveau motivationnel, utilisabilité, connaissance sur la maladie et émergence de l'intérêt que les enfants y portent à travers la curiosité qui en émerge. Les résultats, probants aux comportements observés, montrent un haut niveau de motivation intrinsèque pour utiliser l'outil, un fort taux d'utilisabilité et une grande satisfaction des activités ludo-éducatives. Cette étude pilote nous confirme de continuer dans cette approche en testant le système notamment auprès des enfants asthmatiques sur du moyen terme

Determination of Red Blood Cell fatigue using electrodeformation

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Cyclostationarity-based model for noise analysis of charge amplification with correlated double sampling

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Micro-spectrometer for NMR: analysis of small quantities in vitro

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NMR implantable probe: limit of metabolites detection

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Impedimetric biosensor based on electrospun PEI/PVA decorated with gold nanoparticles for glucose detection.

International audienceImpedimetric biosensor based on electrospun PEI/PVA decorated with gold nanoparticles for glucose detection

NMR planar microcoil for microanalysis

This article deals with the analysis of small sample volume by using a planar microcoil and a micromachined cavity. This microcoil is used as a nuclear magnetic resonance (NMR) radio frequency detection coil in order to perform in vitro NMR analysis of the sample introduced into the microcavity. It is a real challenging task to develop microsystem for NMR spectrum extraction for smaller and smaller sample volume. Moreover, it is advantageous that these microsystems could be integrated in a Micro Total Analysing System ($\mu$-TAS) as an analysing tool. In this paper, NMR theory, description, fabrication process and electrical characterization of planar microcoils receiver are described. Results obtained on NMR microspectroscopy experiments have been performed on water and ethanol, using a 1 mm diameter planar coil. This microcoil is tuned and matched at 85.13 MHz which is the Larmor frequency of proton in a 2 T magnetic field

Investigation of NMR limits of detection for implantable microcoil

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Anisotropic composite polymer for high magnetic force in microfluidic systems (vol 21, 170, 2017)

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