Non-Contact Radiofrequency Inductive Sensor for the Dielectric Characterization of Burn Depth in Organic Tissues

International audienceA flat circular transmission line-based 300 MHz resonator was implemented for the non-contact assessment of burn depths in biological tissues. Used as a transmit-and-receive sensor, it was placed at a 2 mm distance from organic material test samples (pork fillet samples) which were previously burned on their surface in various heating conditions involving different temperatures, durations, and procedures. Data extracted from the sensor by means of a distant monitoring coil were found to clearly correlate with the depth of burn observed in the tissue samples (up to 40% sensor output changes for a 7 mm burn depth) and with the heating conditions (around 5% sensor output changes observed in samples burned with identical heating procedures but at two different temperatures—75 °C and 150 °C—and around 40% sensor output changes observed between samples heated at the same temperature but with different heating procedures). These results open the way for the development of easy-to-implement assessment and monitoring techniques for burns, e.g., integrated in wearable medical dressing-like monitoring devices

L'intrapreneuriat : une pédagogie innovante

International audienceL’objectif de cet article est de présenter une approche pédagogie basée sur l’intrapreneuriat qui est une approche transversale par l'acquisition de compétences métiers. Elle vise à émuler la créativité, des savoirs et savoir-faire au sein d’espaces innovants (FacLab, living Lab, …) et dans un contexte intrapreneurial. Ces compétences nécessitent que chacun des acteurs intègrent les contours et mécanismes des autres partenaires. Cette approche a été implémentée à l’IUT de Cergy-Pontoise (département GEII Sarcelles) et s’articule sur une période de 3 années incluant le DUT et la licence professionnelle IMNEOV. La finalité de ce parcours vise à former des techniciens supérieurs aux métiers du numérique. La méthode adoptée est basée sur une pédagogie active par projet où l’enseignant s’adapte au niveau de l’apprenant

Influence of the structure of nanohybrid polymer materials onto biofilm formation

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Co-Immobilization of Peroxidase and Tyrosinase onto Hybrid Membranes Obtained by the Sol-Gel Method for the Construction of an Optical Biosensor

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Etude Multi-Echelle et Multi-Physique de l’Ordre d’Introduction des Phases d’une Emulsion

International audiencePour optimiser la stabilité d'une émulsion, une investigation multi-échelle est nécessaire. Les moyens préventifs classiques d'étude se font par l'analyse de l'inversion de phase (H/E ou E/H) ou par le changement de paramètres, tels que la composition, le procédé d'émulsification et les conditions environnementales. Ce travail consiste en une étude préliminaire multiphysique et multi échelle, par un changement d'ordre d'introduction des phases. Les caractéristiques mécaniques et électriques sont étudiées à deux échelles d'investigation par deux nouvelles techniques : rhéologie ultrasonore et impédancemétrie radiofréquence. La comparaison des caractéristiques, macroscopiques et mésoscopiques, cherche à identifier les grandeurs d'influence précurseurs d'une (in)stabilité

Double‐bracelet resonator Helmholtz probe for NMR experiments

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Multimodal O/W emulsion structuration characterization using water and emulsion thickening ranges

International audienceTo ensure the stability of emulsions, a thickening agent is often used to induce a higher viscosity of the continuous aqueous phase and reduce the possibility of gravitational separation(1). In some cases, these agents require a base to increase the thickening of emulsions and this process can be observed by following the viscosity as a function of the pH(2). Our work attempts to show the link between gelation process and emulsion stability investigated through the use of two innovative measurement techniques at the mesoscopic scale: micro-rheology by ultrasounds and electrical complex dielectric characterization by contactless radiofrequency spectroscopy. The first one allows to better understand the emulsion structuration through the measurement of the visco-elastic properties(3). The second one is used to get information about polarizability of the mixing and conductivity of the continuous phase(4). A comparison is done between the aqueous phase (water + Carbopol® CETD 2050: gel phase) and the equivalent emulsion (aqueous phase + oil: Isopropyl Palmitate + surfactants: Eumulgin® SMO 20/Cutina® GMS V), for different pH by changing the amount of base (Triethanolamine). Both are made on the same pH range (3.5 – 6) to emphasize steric behavior rather than the electrical one. The mesoscopic characterizations highlight the impact of oil on the gelation state. They also show the limits of pH adjustments on increasing viscosity and electronic repulsion between oil droplets, which are stability-promoting factors. The results are completed by complementary classical characterizations such as conductivity, rheological and optical microscopy measurements, to correlate them with documented macroscopic knowledge(5). (1) Piorkowski D.T., et al, 2014(2) Abdolmaleki K., et al, 2016(3) Gauthier V., et al, 2017(4) Dinh T.H.N., et al, 2016(5) Gutowski I., et al, 200

Multimodal O/W emulsion structuration characterization using water and emulsion thickening ranges

International audienceTo ensure the stability of emulsions, a thickening agent is often used to induce a higher viscosity of the continuous aqueous phase and reduce the possibility of gravitational separation(1). In some cases, these agents require a base to increase the thickening of emulsions and this process can be observed by following the viscosity as a function of the pH(2). Our work attempts to show the link between gelation process and emulsion stability investigated through the use of two innovative measurement techniques at the mesoscopic scale: micro-rheology by ultrasounds and electrical complex dielectric characterization by contactless radiofrequency spectroscopy. The first one allows to better understand the emulsion structuration through the measurement of the visco-elastic properties(3). The second one is used to get information about polarizability of the mixing and conductivity of the continuous phase(4). A comparison is done between the aqueous phase (water + Carbopol® CETD 2050: gel phase) and the equivalent emulsion (aqueous phase + oil: Isopropyl Palmitate + surfactants: Eumulgin® SMO 20/Cutina® GMS V), for different pH by changing the amount of base (Triethanolamine). Both are made on the same pH range (3.5 – 6) to emphasize steric behavior rather than the electrical one. The mesoscopic characterizations highlight the impact of oil on the gelation state. They also show the limits of pH adjustments on increasing viscosity and electronic repulsion between oil droplets, which are stability-promoting factors. The results are completed by complementary classical characterizations such as conductivity, rheological and optical microscopy measurements, to correlate them with documented macroscopic knowledge(5). (1) Piorkowski D.T., et al, 2014(2) Abdolmaleki K., et al, 2016(3) Gauthier V., et al, 2017(4) Dinh T.H.N., et al, 2016(5) Gutowski I., et al, 200

Acoustic resonance in tetramethoxysilane matrices: A new tool to characterize the gel formation

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Multi-turn split-conductor transmission-line resonators

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