Lamb wave sensor for viscous fluids characterization

International audienceThis paper is a study of a new sensor for fluid characterization. This sensor is composed of a stainless steel plate in contact with a viscous material. The aim is to characterize the material viscosity by using reflected Lamb waves at the boundary interface. In order to identify the effects on the Lamb reflected modes by the viscous material, a complete study of the propagation wave in the alone plate is first presented. The propagation modes of the loaded plate are then investigated. By monitoring the mechanical impedance, the viscosity of the material in contact is extracted. In order to validate the experimental set-up, the mechanical impedance variation is measured for different water-glycerol mixtures. Results are in good agreement with those obtained by other techniques in the literature

Investigation de Gels d’Agar chargés de Poudre de Marbre par Rhéologie Ultrasonore Multi-Échelle

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Influence of Ni 2+ on urease activity produced by biofilms of Arthrobacter oxydans 1388

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Viscoelastic material monitoring using an acoustical cylindrical spectrometer

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New wideband electromagnatic on-line system for microalgae production monitoring

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Chirp-Z analysis for sol–gel transition monitoring

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Monitoring of different complex materials with TSM resonators array

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Microrheological monitoring of life cycle of yeast cell Saccharomyces Cerevisiae

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Effects of materials conductivity on the viscosity measurement using a QCM

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Investigation on the proliferation of Gram negative bacterial cells onto sol-gel carriers

International audienceThis work is related to the synthesis and characterization of new hybrid sol-gel materials. Several carriers based on poly (N-acryloylglycine) (NAGly) composed of poly (ethylene glycol) dimethacrylate (PEGDM) were prepared. The effectiveness of biofilms formation of bacterial strains Escherichia coli and Pseudomonas fluorescents on the matrices was investigated by biochemical methods. Two types of hybrid gels were synthesized based on PEGDM, 2-hydroxyethyl acrylate (HEA) and N-acryloxysuccinimide ester (NAS) with incorporation of inorganic precursors. The rheological properties of the gels and formed biofilms were investigated by quartz crystal microbalance (qCM). The experimental results demonstrated that the obtained matrices are appropriate for biofilms formatio