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Study of new porous materials for silicon microfabricated column development in gas chromatography

Abstract : Miniaturization in Gas Chromatography opens the way to low cost, low gas and low power consumption portable devices, which offer in-situ analysis and avoid tedious transport of samples to laboratories. Since the first micro-fabricated column in the late 1970’s, the main focus was directed to the separation of heavy molecular weight hydrocarbons, with 5 or more carbon atoms. In this work, we have developed sol-gel mesotructured silica stationary phases for the separation of light alkanes (from one to 5 carbon atoms) in micro-fabricated columns, following two different procedures: i) the deposition of a sol-gel thin film by dynamic coating directly into the GC capillary or on micro-fabricated columns or ii) the layer-by-layer (LbL) deposition of silica nanoparticles (SNPs) on micro-fabricated columns. The influence of the sol-gel process coating parameters on the final thickness of the stationary phase was studied on short capillary columns. Various ordered or disordered mesostructures were yielded by varying the nature and the concentration of the structure directing agent (SDA), thus allowing the obtention of columns with different retention strengths. Interestingly, the less organized layers led to the columns with the highest retention, comparable with commercial columns for stationary phases being 30 times thinner. The process was successfully transposed to micro-fabricated columns. The obtained micro-columns showed promising efficiencies and the highest number of theoretical plates per meter (th.p./m) reported to date for ethane (7500 th.p./m). Finally, we investigated an alternative way to coat GC micro-columns directly with mesostructured silica nanoparticles using an LbL process. The process was first evaluated for commercial non porous SNPs. Then it was successfully applied to mesostructured custom SNPs and further validated for the full-wafer simultaneous coating of 35 columns. Overall, this work demonstrated the use of mesostructured silica as an effective stationary phase for light alkane’s separation on GC micro-fabricated columns
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  • HAL Id : tel-01867825, version 1




David Lefebvre. Study of new porous materials for silicon microfabricated column development in gas chromatography. Other. Université Claude Bernard - Lyon I, 2014. English. ⟨NNT : 2014LYO10314⟩. ⟨tel-01867825⟩



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