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• W1974543441 abstract "In this article, we report the design of a microchip based hydraulic pump that employs a sodium silicate derived sol–gel structure for generating pressure-driven flow within a microfluidic network. The reported sol–gel structure was fabricated in a chosen location of our device by selectively retaining sodium silicate solution within a sub-micrometer deep segment via capillary forces, and then providing the precursor material appropriate thermal treatment. It was shown that while the molecular weight cut-off for these membranes is at least an order of magnitude smaller than their photo-polymerized counterparts, their electrical conductance is significant. Moreover, unlike their polymeric counterparts these structures were found to be capable of blocking electroosmotic flow, thereby generating a pressure-gradient around their interface with an open microchannel upon application of an electric field across the microchannel–membrane junction. In this work, a fraction of the resulting hydrodynamic flow was successfully guided to an electric field-free analysis channel to implement a pressure-driven assay. Our experiments show that the pressure-driven velocity produced in the analysis channel of our device varied linearly with the voltage applied across the sol–gel membrane and was nearly independent of the cross-sectional dimensions of the membrane and the microfluidic channels. With our current design pressure-driven velocities up to 1.7 mm/s were generated for an applied voltage of 2 kV, which easily covers the range of flow speeds that can minimize the plate height in most microfluidic separations. Finally, the functionality of our device was demonstrated by implementing a reverse phase chromatographic separation in the analysis channel of our device using the pressure-driven flow generated on-chip." @default.
• W1974543441 created "2016-06-24" @default.
• W1974543441 creator A5001742288 @default.
• W1974543441 creator A5051978688 @default.
• W1974543441 creator A5057231802 @default.
• W1974543441 date "2010-07-01" @default.
• W1974543441 modified "2023-10-16" @default.
• W1974543441 title "Sodium silicate based sol–gel structures for generating pressure-driven flow in microfluidic channels" @default.
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• W1974543441 doi "https://doi.org/10.1016/j.chroma.2010.05.054" @default.
• W1974543441 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/20554290" @default.
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