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- W629761254 abstract "This work is based on the development of technological, experimental and theoretical tools dedicated to the study of the surface charge developing at the liquid-solid interface of micro and nanofluidic devices. The control of electrokinetic phenomena involved in most of electrophoretic separation processes was also investigated from a chemical and physical point of view in order to provide new routes for the design of “smart” electrophoretic separation devices. A plateform dedicated to the measurement of electro-osmotic flows (EOFs) was achieved on the basis of an analogy between microfluidics and electronics: the microFluidic Wheatstone Bridge (µFWB). This indirect method enabled us to study the stability issues of the Glass-water interface. In order to control the surface charge, two strategies were confronted: (i) chemically, the influence of acido-basic pretreatments on the hysteresis of glass surface was investigated and multilayer of poly-electrolytes were deposited as surface charge stabilizer; (ii) Physically, conducting polarisable interfaces were used to directly fix the surface potential at the liquid interface (Flow-FETs). This original structure enables to control the surface charge and the EOF dynamically for a wide range of biological buffers. At the nanoscale, our study focused on the electro-preconcentration phenomena through experimental and numerical works. The role of surface charge on preconcentration rate efficiency was highlighted through 1D finite element calculations; this study also enabled us to provide a global understanding of the various preconcentration regimes observed in the literature. Beyond this fundamental study, novel tools were proposed to improve electrophoretic analysis of biological species." @default.
- W629761254 created "2016-06-24" @default.
- W629761254 creator A5016680628 @default.
- W629761254 date "2008-01-01" @default.
- W629761254 modified "2023-09-23" @default.
- W629761254 title "Etude et contrôle de la charge de surface dans les dispositifs micro/nanofluidiques : nouveaux outils pour les sciences séparatives" @default.
- W629761254 hasPublicationYear "2008" @default.
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