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- W4283722862 abstract "Despite its relatively long history, open-channel hydrodynamic chromatography (OC-HDC) still represents a niche technique for determining the size distribution of particle suspensions. Practical limitations of this separation method ultimately arise from the low eluent velocity that is necessary to contain the adverse increase of analyte bandwidth caused by Taylor-Aris dispersion. Because of the micrometric size of the channel cross section, the low eluent velocity translates into order of pL-per-minute flow rates, which introduce a challenge for both the injection and the detection systems. In this article, we provide theoretical/numerical evidence illustrating how a sizable reduction of the Taylor-Aris effect can be obtained by triggering cross-sectional vortices alongside the main pressure-driven axial flow. As a case study, we consider a square channel geometry where the lateral vortices are created by DC-induced electroosmosis. The analysis of particle separation is based on the classical excluded-volume macrotransport approach, which allows to derive the average particle velocity and the axial dispersion coefficient from the solution of two stationary advection-diffusion problems defined onto the channel cross section. We find that lateral vortices can enhance the separation efficiency quantitatively, e.g., by reducing the separation time of a two-species mixture by a 50-fold factor compared to standard OC-HDC." @default.
- W4283722862 created "2022-07-01" @default.
- W4283722862 creator A5015646507 @default.
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- W4283722862 date "2022-06-29" @default.
- W4283722862 modified "2023-10-18" @default.
- W4283722862 title "50-Fold Reduction of Separation Time in Open-Channel Hydrodynamic Chromatography via Lateral Vortices" @default.
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- W4283722862 doi "https://doi.org/10.1021/acs.analchem.2c01791" @default.
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